Science Class 10th PYQs and Practice Questions for Board Exams
Science PYQs and IMP Qs
Class 10th Science PYQs and Practice Questions for Board Exams 2023- 2024
ayushagarwal_maths
MCQs
Q.1. Light of which of the following colour is scattered least ?
(a) Violet
(b) Red
(c) Blue
(d) Yellow
Ans. (b) Red
Q.2. In an electrolysis of water, if the mass of the gas collected at the anode is mₐ and the mass of the gas collected at the cathode is mc the value of (mc/mₐ) is :
(a) 8
(b) 16
(c) 1/16
(d) 1/8
Ans. (d) 1/8
Q.3. The unit of electric energy is :
(a) kilowatt
(b) kilowatt-hour
(c) watt
(d) kilowatt per hour
Ans. (b) kilowatt-hour
Q.4. The average weight of an adult human brain is :
(a) 1200 g
(b) 1350g
(c) 1450 g
(d) 1500 g
Ans. (b) 1350 g
Q.5. In which life processes we take energy from food ?
(a) Nutrition
(b) Excretion
(c) Circulation
(d) All of these
Ans. (a) Nutrition
Q.6. Why do estrogen levels fall after menopause ?
(a) Cells of endometrium degenerate
(b) Ovaries degrade
(c) There are no follicles left to produce estrogen
(d) Pituitary secretes a menopause-specific hormone
Ans. (d) Pituitary secretes a menopause-specific hormone
Q.7. Which of the following mirrors forms a diminished and virtual image of an object ?
(a) plane
(b) Convex
(c) Concave
(d) All of these
Ans. (b) Convex
Q. 8. Consider the following substances :
(i) Acidified K₂Cr₂O₇
(ii) Alkaline KMnO₄
(iii) Oxygen
(iv) Hydrogen
Out of these, the commonly used oxidising agents are :
(a) (i) and (ii) only
(b) (ii) and (iii) only
(c) (i), (ii) and (iii)
(d) (i), (ii) and (iv)
Ans. (a)/(c) (expected answer)
Q. 9. Select from the following Compounds which is not a base :
(a) Sodium hydroxide
(b) Calcium hydroxide
(c) Sodium Sulphate
(d) Zinc Oxide
Ans. (c) Sodium Sulphate
Q.10. One horse-power is equals to :
(a) 726 watt
(b) 736 watt
(c) 746 watt
(d) 756 watt
Ans. (c) 746 watt
Q.11. The range of visible light is :
(a) 400 - 800 mm
(b) 400 - 800 pm
(c) 400 - 800 Å
(d) 400 - 800 nm
Ans. (d) 400 - 800 nm
Q.12. Which of the metabolic function is not involved in nutrition ?
(a) Excretion
(b) Digestion
(c) Assimilation
(d) Ingestion
Ans. (a) Excretion
Q.13. Virtual and larger than object size image of an object can be formed by :
(a) plane mirror
(b) convex mirror
(c) concave mirror
(d) concave lens
Ans. (c) concave mirror
Q.14. What controls whether an embryo will develop testes or ovaries ?
(a) Pituitary gland
(b) Hypothalamus
(c) Y chromosome
(d) Presence or absence of estrogen
Ans. (d) Presence or absence of estrogen
Q. 16. 2 g of yellow sulphur powder is burnt in a china dish and the fumes are collected in a test tube. Water is added in the test tube and the solution is tested separately with blue and red litmus paper. The correct option is :
(a) Blue litmus remains blue and red litmus turns blue.
(b) Blue litmus turns red and red litmus remains red.
(c) Blue litmus turns red and red litmus turns blue.
(d) Blue litmus remains blue and red litmus remains red.
Ans. (b) Blue litmus turns red and red litmus remains red.
Q.17. The unit of the intensity of magnetic field is :
(a) ohm
(b) volt-ampere
(c) Tesla
(d) ampere
Ans. (c) Tesla
Q.18. Which is the most essential components in autotrophic nutrition ?
(a) Sunlight
(b) Water
(c) CO₂
(d) Sunlight
Ans. (a) Sunlight
Q.19. In a metallic wire, electric current flows :
(a) by ions
(b) by protons
(c) by neutrons
(d) by free electrons
Ans. (d) by free electrons
Q.20. The sky when seen from the moon appears :
(a) blue
(b) violet
(c) black
(d) white
Ans. (c) black
Q. 21. An object is placed at a distance of 20 cm, in front of a concave mirror of focal length 10 cm. Its image will be formed :
(a) between mirror and focus
(b) behind the mirror
(c) at focus
(d) at the centre of curvature
Ans. (d) at the centre of curvature
Q.22. In autotrophic nutrition solar energy is converted into :
(a) Electrical energy
(b) Chemical energy
(c) Mechanical energy
(d) Physical energy
Ans. (b) Chemical energy
Q.23. Central Nervous System (CNS) is composed of :
(a) brain only
(b) spinal cord
(c) brain and spinal cord
(d) cerebrum and pons
Ans. (c) brain and spinal cord
Q.24. Where does fertilization of the egg by sperm typically occur ?
(a) Uterus
(b) Vagina
(c) Fallopian tube
(d) Ovary
Ans. (c) Fallopian tube
Q. 25. Which one of the following metals is malleable and a poor conductor of electricity ?
(a) Copper
(b) Zinc
(c) Lead
(d) Silver
Ans. (c) Lead
ayushagarwal_maths
Q. 26. You want to test for hardness of water but hard water is not available in the laboratory. Which of the following compounds may be dissolved in pure water to make it hard ?
(i) Hydrogen Carbonate of Sodium
(ii) Sulphate of Magnesium
(iii) Chloride of Calcium
(iv) Carbonate of Sodium
(a) (i) and (ii)
(b) (ii) and (iii)
(c) (iii) and (iv)
(d) (i) and (iv)
Ans. (b) (ii) and (iii)
Q. 27. Which one of the following properties of Carbon is not responsible for its formation of large number of compounds ?
(a) Tetravalency
(b) Isomerism
(c) Allotropy
(d) Catenation
Ans. (c) Allotropy
Q.28. The unit of resistance is :
(a) ohm / metre
(b) ohm
(c) metre / ohm
(d) ohm-metre
Ans. (b) ohm
Q.29. The colour of sky appears blue :
(a) due to scattering of light
(b) due to reflection of light
(c) due to total internal reflection
(d) due to refraction of light
Ans. (a) due to scattering of light
Q.30. Autotrophic nutrition occurs in :
(a) Green plants, blue-green algae and some bacteria
(b) Only green plants
(c) Green plants and some bacteria
(d) None of the above
Ans. (a) Green plants, blue-green algae and some bacteria
Q. 31. Which type of the system regulates involuntary actions?
(a) Peripheral nervous system
(b) CNS
(c) Autonomous nervous system
(d) Endocrine system
Ans. (c) Autonomous nervous system
Q.32. Timing of puberty can be influenced by which of the following ?
(a) Amount of body fat
(b) Genes
(c) Stress
(d) All of these
Ans. (a) Amount of body fat
Q. 33. Which one of the following molecules is produced initially when glucose breaks down in the cytoplasm of a cell in aerobic as well as anaerobic respiration ?
(a) Lactic acid
(b) Ethanol
(c) Carbon dioxide
(d) Pyruvate
Ans. (d) Pyruvate
Q.34. 12 volt and 30 watt is marked on an electric bulb. The current flowing through it will be :
(a) 12 ampere
(b) 0.4 ampere
(c) 360 ampere
(d) 2.5 ampere
Ans. (d) 2.5 ampere
Q.35. In chemoheterotrophic nutrition, energy is evolved from :
(a) Solar energy
(b) Organic material
(c) Water
(d) Chemicals
Ans. (d) Chemicals
Q.36. The focal length of a convex mirror is 10 cm, its radius of curvature will be :
(a) 5 cm
(b) 10 cm
(c) 20 cm
(d) 25 cm
Ans. (c) 20 cm
Q.37. Unit of intensity of magnetic field is :
(a) Newton-ampere/metre
(b) Newton-ampere-metre
(c) Newton-metre/ampere
(d) Newton/ampere-metre
Ans. (d) Newton/ampere-metre
Q. 38. The refractive index of glass is minimum for the light of :
(a) green colour
(b) red colour
(c) violet colour
(d) yellow colour
Ans. (b) red colour
Q. 39. Which is called very small gap between two nerve cells ?
(a) Ranvier’s node
(b) Myelin
(c) Synapse
(d) Impulse
Ans. (c) Synapse
Q.40. From what structure does the corpus luteum originate ?
(a) Fallopian tube
(b) Dominant follicle
(c) Corpus albicans
(d) Uterine corpus
Ans. (b) Dominant follicle
Q.41. Heterotrophs can not prepare their food due to absence of :
(a) Water
(b) Green pigment-chlorophyll
(c) Sunlight
(d) All of these
Ans. (b) Green pigment-chlorophyll
Q. 42. As compared to daytime, the amount of carbon dioxide released by the plants during night is more because :
(a) It is not produced during daytime.
(b) It is stored in the leaves of plants during daytime.
(c) Major amount of carbon dioxide produced is used up for photosynthesis during daytime.
(d) Plants do not respire during daytime.
Ans. (c) Major amount of carbon dioxide produced is used up for photosynthesis during daytime.
Q.43. Which one of the following is incorrect ?
(a) V / i = R
(b) i = V / R
(c) i / V = R
(d) V = i R
Ans. (c) i / V = R
Q. 44. The organism in which an outgrowth on the parent body develops into a new individual is :
(a) Amoeba
(b) Paramecium
(c) Rhizopus
(d) Yeast
Ans. (d) Yeast
Q.45. Which hard structure covers spinal cord ?
(a) Corpus callosum
(b) Pons
(c) Cerebral cortex
(d) Vertebral column
Ans. (d) Vertebral column
Q.46. The focal length of a concave mirror is -10 cm, the radius of curvature of the mirror will be :
(a) 10 cm
(b) 20 cm
(c) 30 cm
(d) 40 cm
Ans. (b) 20 cm
Q.47. When white light is passed through a prism, the ray of light of spectrum maximum bent towards the base of the prism is of colour :
(a) red
(b) green
(c) blue
(d) violet
Ans. (d) violet
Q.48. In which of the following term sperm and ova are similar :
(a) quantity produced per year
(b) flagellar motility
(c) size
(d) chromosome number
Ans. (c) size
Q.49. Heterotrophs are :
(a) Some bacteria
(b) All animals
(c) Non-green plants
(d) All of these
Ans. (d) All of these
ayushagarwal_maths
Q. 50. In a cross between pure tall pea plants (TT) and pure dwarf pea plants (tt) the offsprings of F1 generation were all tall. When F1 generation was self crossed, the gene combinations of the offsprings oc F2 generation will be :
(a) TT : Tt : tt
(b) TT : tt
(c) Tt : tt
(d) TT : Tt
Ans. (a)TT : Tt : tt
Q. 51. When an object is placed beyond 2F of a convex lens, the nature of the image formed is :
(a) Real, inverted and diminished
(b) Real, erect and magnified
(c) Virtual, erect and magnified
(d) Real, inverted and magnified
Ans. (a) Real, inverted and diminished
Q.52. The colour of light, seen at the maximum distance from the base of the prism in the spectrum of white light is :
(a) yellow
(b) blue
(c) red
(d) violet
Ans. (a) red
Q. 53. When a narrow beam of white light passes through a glass prism it splits into its component colours ? This phenomenon is called :
(a) Diffusion of light
(b) Total reflection of light
(c) Scattering of light
(d) Dispersion of light
Ans. (d) Dispersion of light
Q.54. Four resistances each of resistance 4 ohm are connected in parallel to each other. The equivalent resistance of this combination is :
(a) 2 ohm
(d) 1 ohm
(c) 4 ohm
(d) 3 ohm
Ans. (b) 1 ohm
Q.55. When do the oogonia undergo mitosis ?
(a) At puberty
(b) Before birth
(c) At the beginning of each menstrual cycle
(d) During fertilization
Ans. (b) Before birth
Q.56. The magnetic lines of force :
(a) intersect each other
(b) never intersect each other
(c) meets at a point
(d) are always parallel to each other
Ans. (b) never intersect each other
Q.57. The radius of curvature of concave mirror is 15 cm. The focal length will be :
(a) -7.5 cm
(b) -15cm
(c) 7.5 cm
(d) 30 cm
Ans. (a) -7.5 cm
Q. 58. A material used for making heating elements of electrical heating devices should have :
(a) High resistivity and high melting point
(b) High resistivity and low melting point
(c) Low resistivity and high melting point
(d) Low resistivity and low melting point
Ans. (a) High resistivity and high melting point
Q. 59. The resistance of a wire does not depend on its :
(a) Length
(b) Area of cross-section
(c) Shape
(d) Material
Ans. (c) Shape
Q.60. The digestion is :
(a) Removal of waste material from food
(b) Absorption of simple molecules of food
(c) Intake of food
(d) Breakdown of complex insoluble molecules of the food into water soluble simple molecules
Ans. (d) Breakdown of complex insoluble molecules of the food into water soluble simple molecules
Q.61. The sheath of myelin is found with :
(a) dendrite
(b) axon
(c) spinal cord
(d) cell body
Ans. (b) axon
Q.62. When white light passes through a prism, the deviation of which colour is maximum for the ray ?
(a) Yellow colour
(b) Red colour
(c) Green colour
(d) Violet colour
Ans. (d) Violet colour
ayushagarwal_maths
Q. 63. The shape of magnetic field lines produced (i) inside a solenoid
(ii) around a straight conductor, both carrying current of the same magnitude are, respectively :
(a) (i) straight, (ii) circular
(b) (i) circular, (ii) circular
(c) (i) straight, (ii) straight
(d) (i) circular, (ii) straight
Ans. (a) (i) straight, (ii) circular
Q.64. Legume plants show mutual relationship with nitrogen fixing bacteria which is called :
(a) Commensalism
(b) Parasitism
(c) Symbiosis
(d) None of these
Ans. (c) Symbiosis
Q.65. A current of 1.5 ampere is flowing through a wire of 1.5 ohm resistance. The potential difference between the ends of the wire is :
(a) 0.225 volt
(b) 22.5 volt
(c) 2.25 volt
(d) 1.0 volt
Ans. (c) 2.25 volt
Q.66. The focal length of a concave mirror of radius of curvature 20 cm will be :
(a) 5 cm
(b) 10 cm
(c) 15 cm
(d) 20 cm
Ans. (b) 10 cm
Q.67. Which part of the sperm contact with oocyte ?
(a) Zona pellucida
(b) Sperm-binding receptors
(c) Corona radiata
(d) Acrosome
Ans. (a) Zona pellucida
Q.68. Which of the following controls involutary actions ?
(a) Medulla oblongata
(b) Pons
(c) Hypothalamus
(d) Cerebellum
Ans. (a) Medulla oblongata
Q.69. The metal which melts when kept on the palm is :
(a) Sodium
(b) Potassium
(c) Lithium
(d) Gallium
Ans. (d) Gallium
Q.70. The dynamo produces :
(a) electromotive force
(b) magnetic field
(c) charge
(d) electric field
Ans. (a) electromotive force
Q.71. In photosynthesis, plants prepare their food in presence of sunlight from :
(a) Simple organic molecules such as glucose
(b) Simple inorganic molecules such as water and CO₂
(c) Complex organic material such as strach
(d) None of these
Ans. (b) Simple inorganic molecules such as water and CO₂
Q.72. S.I. Unit of electric current is :
(a) ohm
(b) ampere
(c) coulomb
(d) joule
Ans. (b) ampere
Q.73. The colour of light, which is deviated least by a prism in the spectrum of white light, is :
(a) red
(b) violet
(c) blue
(d) green
Ans. (a) red
Q.74. Ptyalin is secreted by :
(a) Stomach
(b) Saliva
(c) Bile
(d) Pancreas
Ans. (b) Saliva
Q. 75. Select washing soda from the following :
(a) NaHCO₃
(b) Na₂CO₃. 5H₂O
(c) Na₂CO₃. 10H₂O
(d) NaOH
Ans. (c) Na₂CO₃. 10H₂O
Q. 76.Copper is used for making cooking utensils. Which of the following physical properties of copper is NOT responsible for the same ?
(a) Malleability
(b) High melting point
(c) Thermal conductivity
(d) High reactivity
Ans. (d) High reactivity
Q. 77. Select endothermic reaction from the following :
(a) Decomposition of vegetable matter into compost.
(b) Decomposition of calcium carbonate to form quick lime and carbon dioxide.
(c) Burning of a candle.
(d) Process of respiration.
Ans. (b) Decomposition of calcium carbonate to form quick lime and carbon dioxide.
Q.78. Name the basic unit (structural and functional) of human nervous system ?
(a) Axon
(b) Brain
(c) Nerve cell or neuron
(d) Cell body
Ans. (c) Nerve cell or neuron
Q.79. The order of the different colours, seen in the spectrum of white light is given by the word :
(a) VIBOGYR
(b) VIBGOYR
(c) VIBYGOR
(d) VIBGYOR
Ans. (d) VIBGYOR
Q.80. The female gonads are known as :
(a) oocytes
(b) ova
(c) oviducts
(d) ovaries
Ans. (d) ovaries
Q.81. The major site of protein breakdown is :
(a) Spleen
(b) Kidney
(c) Bone marrow
(d) Liver
Ans. (d) Liver
Q.82. The relation between focal length (f) and radius of curvature (r) is :
(a) f = 1 / r
(b) f = 2 r
(c) 2f = r
(d) f = r
Ans. (c) 2f = r
Q. 83. Select from the following the correct statement about tropic movement in plants :
(a) It is due to stimulus of touch and temperature.
(b) It does not depend upon the direction of stimulus received.
(c) It is observed only in roots and not in stems.
(d) It is a growth related movement.
Ans. (d) It is a growth related movement.
Q.84. An electron is moving with velocity v perpendicular to an uniform magnetic field B. The force acting on the electron will be :
(a) e B / v
(b) e v / B
(c) v B / e
(d) e v B
Ans. (d) e v B
Q.85. The brain is connected by membranes which are called?
(a) Pons
(b) Meninges
(c) Corpus callosum
(d) Thalamus
Ans. (c) Corpus callosum
Q.86. If two resistances of resistance R is connected in parallel arrangement and a resistance R is connected in the series of the above, then the resultant resistance will be :
(a) 2 R
(b) 3 R
(c) R / 2
(d) 3R / 2
Ans. (d) 3R / 2
Q.87. What is the most important function of bile?
(a) Protein digestion
(b) Carbohydrate digestion
(c) Fat emulaification
(d) Elimination of excretory product
Ans. (c) Fat emulaification
Q.88. By human eye the image of an object is formed at :
(a) iris
(b) cornea
(d) pupil
(d) retina
Ans. (d) retina
Q.89. Conjugate focus are possible only in :
(a) plane mirror
(b) Concave mirror
(c) convex mirror
(d) ordinary glass
Ans. (b) Concave mirror
Q.90. Which of the following structure is the principal source of testosterone?
(a) Interstitial cells
(b) Seminal vesicles
(c) Seminiferous tubules
(d) Sustentacular cells
Ans. (d) Sustentacular cells
Q.91. Which of the structure covers the brain ?
(a) Thalamus
(b) Corpus callosum
(c) Vertebral column
(d) Cranium
Ans. (d) Cranium
Q. 92. The statement that correctly describes the characteristic(s) of a gene is :
(a) In individuals of a given species, a specific gene is located on a particular chromosome.
(b) A gene is not the information source for making proteins in the cell.
(c) Each chromosome has only one gene located all along its length.
(d) All the inherited traits in human beings are not controlled by genes.
Ans. (a) In individuals of a given species, a specific gene is located on a particular chromosome.
Q. 93. Consider the following statements about small intestine and select the one which is NOT correct :
(a) The length of the small intestine in animals differs as it depends on the type of food they eat.
(b) The small intestine is the site of complete digestion of food.
(c) The small intestine receives secretions from liver and pancreas.
(d) The villi of the small intestine absorb water from the unabsorbed food before it gets removed from the body via the anus.
Ans. (d) The villi of the small intestine absorb water from the unabsorbed food before it gets removed from the body via the anus.
Q. 94. An organism which breaks down the food material outside the body and then absorbs it is
(a) a plant parasite, Cuscuta.
(b) an animal parasite, Tapeworm.
(c) a bacteria, Rhizobium.
(d) a fungi, Rhizopus.
Ans. (d) a fungi, Rhizopus.
Q.95. Mucus is secreted by :
(a) Small intestine
(b) Large intestine
(c) Stomach
(d) Duodenum
Ans. (c) Stomach
Q.96. The focal length of a convex lens is 2 metres. The power of the lens will be :
(a) -5 D
(b) +0.5 D
(c) +5 D
(d) +50 D
Ans. (b) +0.5 D
Q.97. Which part of a neuron receives the nerve impulse ?
(a) Axon
(b) Dendrite
(c) Nerve fibre
(d) Cell body
Ans. (b) Dendrite
Q. 98. An electric iron of 1500 W, 200 V and a flash light of 500 W, 200 V are used in homes. The rating of fuse to be used should be
(a) 5 A
(b) 10 A
(c) 15 A
( d) 20 A
Ans. (b) 10 A
Q.99. Kilowatt-hour is the unit of :
(a) energy
(b) mass
(c) electrical power
(d) time
Ans. (a) energy
Q.100. The focal length of a lens is 50 cm. Its power will be :
(a) 2 D
(b) 3 D
(c) 4 D
(d) 5 D
Ans. (a) 2 D
Q.101. Which of the following hormone serve as growth promoter in plants ?
(a) Abscisic acid
(b) Auxin
(c) Cytokinin
(d) Auxin and cytokinin
Ans. (d) Auxin and cytokinin
Q.102. Moving charge produce :
(a) Only magnetic field
(b) Only electric field
(c) Both electric and magnetic fields
(d) neither electrical field nor magnetic field
Ans. (c) Both electric and magnetic fields
Q.103. The image of an object, placed in front of a concave mirror between its pole and focus is :
(a) erect, real, enlarged
(b) erect, virtual, diminished
(c) erect, virtual, enlarged
(d) erect, real, diminished
Ans. (c) erect, virtual, enlarged
Q.104. A person who is taking rice in his diet. He consumes mainly :
(a) Cellulose
(b) Lactose
(c) Starch
(d) Protein
Ans. (a) Cellulose
Q.105. The storage organ for sperm to ejaculation is :
(a) the epididymis
(b) the bulb of penis
(c) the seminiferous tubules
(d) the seminal vesicles
Ans. (d) the seminal vesicles
Q.106. Which of the following gland is related to kidney ?
(a) Thyroid
(b) Adrenal
(c) Pituitary
(d) Testis
Ans. (b) Adrenal
Q. 107. In domestic electric circuits the wiring with 15 A current rating is for the electric devices which have
(a) higher power ratings such as geyser.
(b) lower power ratings such as fan.
(c) metallic bodies and low power ratings.
(d) non- metallic bodies and low power ratings.
Ans. (a) higher power ratings such as geyser.
Q. 108. If four identical resistors, of resistance 8 ohm, are first connected in series so as to give an effective resistance Rs, and then connected in parallel so as to give an effective resistance Rp, then the ratio Rs/Rp is
(a) 32
(b) 2
(c) 0.5
(d) 16
Ans. (d) 16
Q. 109. The colour of the solution observed after 30 minutes of placing zinc metal to copper sulphate solution is
a) Blue
b) Colourless
c) Dirty green
d) Reddish Brown
Ans. (b) Colourless
Q.110. The near point of a person suffering from long-sightedness is :
(a) at a distance less than 25 cm
(b) at 25 cm
(c) beyond 25 cm
(d) at infinity
Ans. (c) beyond 25 cm
Q.111. The focus distance of the plane mirror is :
(a) -25 cm
(b) zero
(c) 25 cm
(d) infinite
Ans. (d) infinite
Q.112. Which of the following hormone stimulates the absorption of water and controls the loss of water in the kidney ?
(a) TSH
(b) ADH
(c) ACTH
(d) FSH
Ans. (b) ADH
Q.113. Spermatogenesis takes place in the :
(a) seminiferous tubules
(b) prostate gland
(c) ejaculatory duct
(d) glans penis
Ans. (a) seminiferous tubules
Q.114. The toxic substances are killed in :
(a) Kidneys
(b) Stomach
(c) Lungs
(d) Liver
Ans. (d) Liver
Q.115. Which body organ prevent the lungs ?
(a) Back bone
(b) Rib cage
(c) Sternum
(d) All of these
Ans. (d) All of these
Q. 116. Mild non-corrosive basic salt is
a) Ca (OH)₂
b) NaCl
c) NaOH
d) NaHCO₃
Ans. (d) NaHCO₃
Q.117. An electric bulb is rated as 240 V-60 W. The resistance of its filament will be :
(a) 960 ohm
(b) 1440 ohm
(c) 1920 ohm
(d) 1200 ohm
Ans. (a) 960 ohm
Q. 118. On adding dilute sulphuric acid to a test tube containing a metal ‘X’, a colourless gas is produced when a burning match stick is brought near it. Which of the following correctly represents metal ‘X’?
a) Sodium
b) Sulphur
c) Copper
d) Silver
Ans. (a) Sodium
Q. 119. An element with atomic number_____ will form a basic oxide.
a) 7 (2,5)
b) 17 (2,8,7)
c) 14 (2,8,4)
d) 11 (2,8,1)
Ans. (d) 11 (2, 8,1)
Q.120. Due to the defect of vision of long-sightedness, the image is formed :
(a) in front of the retina
(b) behind the retina
(c) at retina
(d) none of these
Ans. (b) behind the retina
Q.121. One object is placed before plane mirror at a distance of 10 cm. The distance of image from the mirror will be :
(a) 0 cm
(b) 5 cm
(c) 10 cm
(d) 20 cm
Ans. (c) 10 cm
Q.122. Normal blood pressure is :
(a) 100/80 mm Hg
(b) 120/80 mm Hg
(c) 140/100 mm Hg
(d) 170/90 mm Hg
Ans. (b) 120/80 mm Hg
Q.123. The unit of magnetic flux is :
(a) Weber
(b) Weber / metre²
(c) Weber / metre
(d) Weber-metre²
Ans. (b) Weber / metre²
Q.124. In fever breathing rate :
(a) Increases
(b) Decreases
(c) Stops
(d) None of these
Ans. (a) Increases
Q.125. What is the function of epididymis ?
(a) Produces the bulk of seminal fluid
(b) Sperm maturation and storage
(c) Spermatogenesis
(d) Provides nitric oxide needed for erection
Ans. (b) Sperm maturation and storage
Q.126. Which is called ‘fight or flight’ hormone ?
(a) Testosterone
(b) Thyroxine
(c) Adrenaline
(d) FSH
Ans. (c) Adrenaline
Q. 127. An element ‘M' has 50% of the electrons filled in the 3rd shell as in the 2nd shell. The atomic number of ‘M’ is:
a) 10
b) 12
c) 14
d) 18
Ans. (c) 14
Q. 128. The Bowman's capsules are found in :
(a) Distal tubule
(b) Cortex
(c) Medulla
(d) Proximal tubule
Ans. (b) Cortex
Q.129. A bulb, when connected to a source of 220 volts, draws 1 ampere current. The power of the bulb is :
(a) 50 watt
(b) 100 watt
(c) 200 watt
(d) 400 watt
Ans. (c) 200 watt
Q.130. A ray of light is incident normally at the separating plane of two media. The angle of refraction will be :
(a) 0⁰
(b) 45⁰
(c) 60⁰
(d) 90⁰
Ans. (a) 0⁰
Q. 131. Magnesium ribbon is rubbed before burning because it has a coating of
(a) basic magnesium carbonate(b) basic magnesium oxide
(c) basic magnesium sulphide
(d) basic magnesium chloride
(b) 1:1
(c) 2:1
(d) 1:8
Q.140. Which of the following minerals is responsible for goitre ?
(a) Iron
(b) Sodium
(c) Iodine
(d) Protein
Ans. (c) Iodine
Q.150. Haemoglobin is :
(a) Green pigment
(b) Bile pigment
(c) Respiratory pigment
(d) An enzyme
Ans. (c) Respiratory pigment
Q.151. To correct the defect of long-sightedness we use a :
(a) convex lens of any focal length
(b) concave lens of any focal length
(c) concave lens of suitable focal length
(d) convex lens of suitable focal length
Ans. (d) convex lens of suitable focal length
Q.152. Which hypothalamic hormone contributes to the regulation of male reproductive system ?
(a) Androgens
(b) Luteinizing hormone
(c) Gonadotropin releasing hormone
(d) Follicle stimulating hormone
Ans. (a) Androgens
Q. 153. Generally food is broken and absorbed within the body of organisms. In which of the following organisms is it done outside the body?
a) Amoeba
b) Mushroom
c) Paramoecium
d) Lice
Ans. b) Mushroom
Q. 154. Receptors are usually located in sense organs. Gustatory receptors are present in
a) tongue
b) nose
c) eye
d) ear
Ans. a) tongue
Q.155. Exchange of gases in lungs occurs through :
(a) Passive transport
(b) Active transport
(c) Osmosis
(d) Simple diffusion
Ans. (d) Simple diffusion
Q.156. The powers of two electric bulbs are 100 W and 220 W. Both of these are connected to 220 volt mains. The ratio of the resistance of filaments of the bulb is :
(a) 2 : 1
(b) 1 : 2
(c) 4 : 1
(d) 1 : 4
Ans. (a) 2 : 1
Q.157. Correct sequence of urine formation is :
(a) Reabsorption, filteration, secretion
(b) Reabsorption, secretion, filteration
(c) Secretion, reabsorption, filteration
(d) Filteration, reabsorption, secretion
Ans. (d) Filteration, reabsorption, secretion
Q. 158. If angle of incidence be 42⁰ and angle of refraction be 30⁰, then the refracted ray is diverted by :
(a) 1.4⁰
(b) 12⁰
(c) 72⁰
(d) Sin 42⁰ / Sin 30⁰
Ans. (b) 12⁰
Q. 159. Which one of the following is an option to remove the defect of hypermetropia ?
(a) Convex lens
(b) Concave lens
(c) Convex mirror
(d) Concave mirror
Ans. (a) Convex lens
Q.160. Diabetes is caused due to insufficient secretion of :
( a) prolactin
(b) glucagon
(c) insulin
(d) oxytocin
Ans. (c) insulin
Q. 161. A farmer wants to grow banana plants genetically similar enough to the plants already available in his field. Which one of the following methods would you suggest for this purpose?
a) Regeneration
b) Budding
c) Vegetative propagation
d) Sexual reproduction
Ans. c) Vegetative propagation
Q. 162. Height of a plant is regulated by:
a) DNA which is directly influenced by growth hormone.
b) Genes which regulate the proteins directly.
c) Growth hormones under the influence of the enzymes coded by a gene.
d) Growth hormones directly under the influence a gene.
Ans. c) Growth hormones under the influence of the enzymes coded by a gene.
Q.163. One molecule of haemoglobin can carry how many oxygen molecules ?
(a) 2
(b) 3
(c) 4
(d) 6
Ans. (c) 4
Q.164. The law for determining the direction of magnetic force acting on a charged particle moving in a magnetic field is :
(a) Right hand thumb rule
(b) Ohm’s law
(c) Right hand screw rule
(d) Fleming’s left hand rule
Ans. (d) Fleming’s left hand rule
Q.165. The filament in an electric bulb is of :
(a) copper
(b) tungsten
(c) brass
(d) iron
Ans. (b) tungsten
Q.166. The refractive index of glass with respect to air is 1.5, the refractive index of air with respect to glass will be :
(a) 1.5 - 1
(b) 1 / 1.5
(c) 1.5
(d) 1.5 + 1
Ans. (b) 1 / 1.5
Q.167. To correct the defect of short-sightedness, we use :
(a) Concave mirror
(b) Concave lens
(c) Convex mirror
(d) Convex lens
Ans. (b) Concave lens
Q.168. Which one of the following is not sexual transmitted disease?
(a) Syphilis
(b) AIDS
(c) Gonorrhea
(d) None of these
Ans. (b) AIDS
Q.169. How many pairs of nerves originate from spinal cord ?
(a) 21
(b) 31
(c) 41
(d) 62
Ans. (b) 31
Q. 170. A sportsman, after a long break of his routine exercise, suffered muscular cramps during a heavy exercise session. This happened due to:
a) lack of carbon dioxide and formation of pyruvate.
b) presence of oxygen and formation of ethanol.
c) lack of oxygen and formation of lactic acid.
d) lack of oxygen and formation of carbon dioxide.
Ans. c) lack of oxygen and formation of lactic acid.
Q. 171. An object is placed in front of a convex mirror. Its image is formed :
a) at a distance equal to the object distance in front of the mirror.
b) at twice the distance of the object in front of the mirror.
c) half the distance of the object in front of the mirror.
d) behind the mirror and it’s position varies according to the object distance.
Ans. d) behind the mirror and its position varies according to the object distance.
Q. 172. When light enters the atmosphere it strikes on extremely fine particles, which deflect the rays of light in all possible directions, This is due to -
(a) reflection of light
(b) atmospheric refraction
(c) scattering of light
(d) dispersion of light
Ans. c) scattering of light.
Q.173. The refractive index of glass with respect to air is 3 / 2 the refractive index of air with respect to glass will be :
(a) 1 / 2
(b) 2 / 3
(c) 3 / 2
( d ) 5 / 2
Ans. (b) 2 / 3
Q.174. The filament of electric bulb is made up of tungsten, because
(a) its melting point is very high
(b) its melting point is very low
(c) its resistance is negligible
(d) its filament is made easily
Ans. (a) its melting point is very high
Q.175. In a healthy human eye image is formed :
(a) before retina
(b) beyond retina
(c) at retina
(d) at infinity
Ans. (c) at retina
Q.176. Male gamete(sperm) which is four in number arise from the structure :
(a) spermatogonium
(b) spermatids
(c) primordial germ cell
(d) secondary spermatocyte
Ans. (c) primordial germ cell
Q. 177. In 1987, an agreement was formulated by the United Nations Environment Programme (UNEP) to freeze the production of “X” to prevent depletion of “Y”. “X” and “Y”
respectively referred here are:
a) Ozone; CFCs
b) CFCs; rays UV
c) CFCs; Ozone
d) UV rays; Diatomic oxygen
Ans. c) CFCs, Ozone
Q.178. The intensity of magnetic field due to a current carrying solenoid depends upon :
(a) the magnitude of the electric current
(b) the number of turns in the coil
(c) the nature of material of the coil
(d) all of these
Ans. (d) all of these
Q.179. The focal length of a lens is 20 cm. Its power will be :
(a) 2 D
(b) 3 D
(c) 4 D
(d) 5 D
Ans. (d) 5 D
Q.180. Which of the following hormones is known as emergency hormone ?
(a) Insulin
(b) Adrenaline
(c) Growth Hormone
(d) Testosterone
Ans. (b) Adrenaline
Q.181. Refractive index of glass with respect to air is 3 / 2. The speed of light in air is 3 × 10⁸ m/s . The speed of light in glass will be :
(a) 1.0 × 10⁸ m/s
(b) 2 × 10⁸ m/s
(c) 3 × 10⁸ m/s
(d) 4.5 × 10⁸ m/s
Ans. (b) 2× 10⁸ m/s
Q.182. Descent of testes in the scrotum includes from the structure
(a) The ductus deferens
(b) The inguinal canal
(c) The seminiferous tubule
(d) The spermatic cord
Ans. (c) The seminiferous tubule
Q.183. Which of the following features relates to biodegradable substances?
a) Broken down by biological processes
b) Remain inert
c) Persist in environment for long time
d) May harm the ecosystem
Ans. a) Broken down by biological processes
Q.184. On passing current, through the filament of an electric bulb, it glows but the wires carrying current do not. It is because that :
(a) the resistance of connecting wire is high whereas that of filament is low
(b) the resistance of connecting wire is low whereas that of filament is high
(c) current flowing in filament is more than wires
(d) the connecting wire is insulator of heat whereas the filament is conductor
Ans. (b) the resistance of connecting wire is low whereas that of filament is high
Q. 185. On placing a copper coin in a test tube containing green ferrous sulphate solution, it will be observed that the ferrous sulphate solution
(a) turns blue, and a grey substance is deposited on the copper coin.
(b) turns colourless and a grey substance is deposited on the copper coin.
(c) turns colourless and a reddish–brown substance is deposited on the copper coin.
(d) remains green with no change in the copper coin.
Ans. (d) Ferrous Sulphate solution remains green with no change in the copper coin.
Q. 186. Anita added a drop each of diluted acetic acid and diluted hydrochloric acid on pH paper and compared the colors. Which of the following is the correct conclusion?
(a) pH of acetic acid is more than that of hydrochloric acid.
(b) pH of acetic acid is less than that of hydrochloric acid.
(c) Acetic acid dissociates completely in aqueous solution.
(d) Acetic acid is a strong acid
Ans. (a) pH of acetic acid is more than that of hydrochloric acid.
Q.187. Male gamete is known as :
(a) ova
(b) sperm
(c) testes
(d) testosterone
Ans. (b) sperm
Q.188. The wire of heater coil is of :
(a) nichrome
(b) iron
(c) brass
(d) tungsten
Ans. (a) nichrome
Q.189. The refractive index of glass is maximum :
(a) for red colour
(b) for green colour
(c) for violet colour
(d) for yellow colour
Ans. (c) for violet colour
Q.190. The far point for a healthy eye is :
(a) 25 cm
(b) 50 cm
(c) 1 m
(d) infinite
Ans. (d) infinite
Q. 191. If a tall pea plant is crossed with a pure dwarf pea plant then, what percentage of F1 and F2 generation respectively will be tall?
(a) 25%, 25%
(b) 50%, 50%
(c) 75%,100%
(d) 100%, 75%
Ans. (d) 100%, 75%
Q.192. The property of light by which the sky appears blue is :
(a) reflection
(b) refraction
(c) scattering
(d) dispersion of light
Ans. (c) scattering
Q.193. The device to generate electric current is :
(a) generator
(b) ammeter
(c) galvanometer
(d) motor
Ans. (a) generator
Q. 194. A complete circuit is left on for several minutes, causing the connecting copper wire to become hot. As the temperature of the wire increases, the electrical resistance of the wire
(a) decreases.
(b) remains the same.
(c) increases.
(d) increases for some time and then decreases .
Ans. (c) increases.
Q.195. The wire of heater must be made up of such a material, which has :
(a) low specific resistance and high melting point
(b) low specific resistance and low melting point
(c) high specific resistance and low melting point
(d) high specific resistance and high melting point
Ans. (d) high specific resistance and high melting point
Q.196. The least distance of distinct vision for a healthy eye is :
(a) 25 cm
(b) 30 cm
(c) 25 m
(d) infinity
Ans. (a) 25 cm
Q. 197. The image formed by lens, of an object placed between the optical centre and focus of convex lens is :
(a) virtual, inverted and enlarged
(b) virtual, enlarged and erect
(c) virtual, erect and diminished
(d) virtual, inverted and diminished
Ans. (b) virtual, enlarged and erect
Q. 198. Which of the following pattern correctly describes the magnetic field around a long straight wire carrying current?
(a) straight lines perpendicular to the wire.
(b) straight lines parallel to the wire.
(c) radial lines originating from the wire.
(d) concentric circles centred around the wire.
Ans. (d) The field consists of concentric circles centred around the wire.
Q. 199. Select a pair of olfactory indicators from the following :
(a) Clove oil and vanilla essence
(b) Onion and turmeric
(c) Clove oil and litmus solution
(d) Vanilla and methyl orange
Ans. (a) Clove oil and vanilla essence
Q.200. When an end of a solenoid is seen from the front side and if the current flowing appears towards south in clockwise direction then this end will form :
(a) North Pole
(b) South Pole
(c) either South Pole or North Pole
(d) none of the two poles
Ans. (b) south pole
Q. 201. Fresh milk has a PH of 6 . To delay its curdling, a chemical substance is added to it , which is :
(a) Sodium carbonate
(b) Baking powder
(c) Sodium hydroxide (Caustic soda)
(d) Baking soda (sodium hydrogen carbonate)
Ans. (d) Baking soda (sodium hydrogen carbonate)
Q.202. The wires in domestic main line are :
(a) both wire neutral
(b) both wire live
(c) one live and other neutral
(d) one thick and other thin
Ans. (c) one live and other neutral
Q.203. An enlarged and erect image of an object is formed by a convex lens, when the object is placed :
(a) between focus and optical centre of the lens
(b) between focus and twice the focus of the lens
(c) beyond twice the distance of its focal length
(d) at a distance twice the focal length of lens
Ans. (a) between focus and optical centre of the lens
Q.204. Which of the following statements is true for an amphoteric oxide ?
(a) It reacts only with acid and does not form water.
(b) It reacts with acid as well as base to form salt and hydrogen gas.
(c) It reacts with both acid as well as base to form salt and water.
(d) It reacts only with base and does not form water.
Ans. c) It reacts with both acid as well as base to form salt and water.
Q.205. Hydronium ions are formed by the reaction between :
(a) Sodium hydroxide and water
(b) Calcium chloride and water
(c) Hydrogen chloride gas and water
(d) Ethanol and water
Ans. (c) Hydrogen chloride gas and water
Q.206. 2 ampere current is passed through a conductor for 1 minute at 10 volt. The value of electric energy consumed in the wire will be :
(a) 10 joules
(b) 5 joules
(c) 1200 joules
(d) 20 joules
Ans. (c) 1200 joules
Q.207. If an object is placed infront of the convex lens at a distance of 2f. The distance of its image from the lens will be :
(a) at infinity
(b) at 2f
(c) at f
(d) between 2f and infinity
Ans. (b) at 2f
Q. 208. As compared to terrestrial organisms, the rate of breathing in aquatic organisms is :
(a) Faster because they need more oxygen for their survival.
(b) Faster because the amount of dissolved oxygen in water is fairly low .
(c) Slower because the amount of dissolved oxygen in water is fairly low.
(d) Slower because the capacity of water of dissolving atmospheric air is limited.
Ans. (b) Faster because the amount of dissolved oxygen in water is fairly low .
Q.209. In which of the following situations, no force will be exerted on an electric charge ?
(a) Charge stationary in an electric field
(b) Charge moving in an electric field
(c) Charge moving perendicular to the magnetic field
(d) Charge moving parallel to the magnetic field
Ans. (d) Charge moving parallel to the magnetic field
Q.210. To obtain a real inverted and enlarged image of an object from convex lens, the object should be placed :
(a) at the focus of the lens
(b) at a distance 2f from the lens
(c) between f and 2f of the lens
(d) between 2f and infinity
Ans. (c) between f and 2f of the lens
Q.211. The instrument used for measuring electric energy is :
(a) voltmeter
(b) switch
(c) watt-hour-meter
(d) plug
Ans. (c) watt-hour-meter
Q.212. The process in which loss of water in the form of vapours from the aerial parts of plants takes place is X, which helps in Y. Here X and Y respectively are :
(a) transpiration and photosynthesis.
(b) transpiration and temperature regulation.
(c) translocation and movement of soluble products of photosynthesis in phloem.
(d) translocation and absorption of water and minerals from soil by roots.
Ans. (b) transpiration and temperature regulation.
Q. 213. Consider the following two statements :
(i) The trait that expresses itself in F1 generation.
(ii) The trait that keeps on passing from one generation to another.
The appropriate terms for the statements (i) and (ii) respectively are :
(a) Recessive trait, Dominant trait
(b) Dominant trait, Recessive trait
(c) Dominant trait, Inherited trait
(d) Recessive trait, Inherited trait
Ans. (c) Dominant trait, Inherited trait
Q.214. The focal length of a convex lens is 15 cm. The image of an object, placed at a distance of 30 cm from the lens, will form :
(a) real, inverted, same size as of object at a distance of 30 cm on the same side as that of object
(b) real, inverted, same size as of object at a distance of 30 cm on the opposite side as that of object
(c) real, inverted, same size as of object at a distance of 15 cm on the opposite side as that of object
(d) virtual,erect, same size as of the object at a distance of 15 cm on the same side as that of object
Ans. real, inverted, same size as of object at a distance of 30 cm on the opposite side as that of object
Q.215. On an electric bulb 100 W-250 V is written. Its resistance will be :
(a) 25000 ohm
(b) 625 ohm
(c) 25 ohm
(d) 2.5 ohm
Ans. (b) 625 ohm
Q. 216. The part in which gustatory receptors are present in our body is :
(a) Inner ear
(b) Skin
(c) Tongue
(d) Inner lining of nose
Ans. (c) Tongue
Q.217. The bacterial and the viral infections that may be caused due to unsafe sex respectively are :
(a) Warts and HIV-AIDS
(b) HIV-AIDS and warts
(c) Gonorrhoea and syphilis
(d) Syphilis and warts
Ans. (d) Syphilis and warts
Q.218. An electric kettle consumes 1 kW of electric power when operated at 220 V. The minimum rating of the fuse wire to be used for it is
(a) 1A
(b) 2A
(c) 4A
(d) 5A
Ans. (d) 5A
Q.219. An electron is moving in a magnetic field in a direction parallel to the field. On the electron :
(a) direction of force will be opposite to the direction of the field
(b) no force will be exerted
(c) the direction of force will be in the direction of the field
(d) the direction of force will be perpendicular to the field
Ans. (b) no force will be exerted
Q.220. In front of which one of the following object must be placed to obtain its erect, virtual and diminished image always ?
(a) Plane mirror
(b) Concave mirror
(c) Convex lens
(d) Concave lens
Ans. (d) Concave lens
Q. 221. For a current in a long straight solenoid, N and S poles are created at the two ends. Among the following statements, the incorrect statement is :
(a) The magnetic field lines inside the solenoid are in the form of straight lines, which indicates that the magnetic field is uniform at all points inside the solenoid.
(b) The strong magnetic field produced inside the solenoid can magnetize the soft iron placed inside it.
(c) The pattern of the magnetic field associated with a current carrying solenoid is different from the pattern of the magnetic field around a bar magnet.
(d) The N and S poles exchange positions when the direction of current through the solenoid is reversed.
Ans. (c) The pattern of the magnetic field associated with a current carrying solenoid is different from the pattern of the magnetic field around a bar magnet.
Q. 222. When sodium bicarbonate reacts with dilute hydrochloric acid, the gas evolved is :
(i) Hydrogen; it gives pop sound with burning match stick.
(ii) Hydrogen; it turns lime water milky.
(iii) Carbon dioxide; it turns lime water milky.
(iv) Carbon dioxide; it blows off a burning match stick with a pop sound
Ans. (iii) Carbon dioxide; it turns lime water milky.
Q.223. Acid present in tomato is :
(i) Methanoic acid
(ii) Acetic acid
(iii) Lactic acid
(iv) Oxalic acid
Ans. (iv) Oxalic acid
Q.224. An image of an object, placed at a distance of 0.4 m from a concave lens of focal length 0.4 m is obtained :
(a) at infinity
(b) at 0.4 m from the lens on the same side as that of the object
(c) at 0.2 m from the lens on the same side as that of the object
(d) at 0.4 m from the lens on the opposite side as that of the object
Ans. (c) at 0.2 m from the lens on the same side as that of the object
Q.225. The name of the salt used to remove permanent hardness of water is :
(i) Sodium hydrogen carbonate (NaHCO₃)
(ii) Sodium chloride ( NaCl )
(iii) Sodium carbonate decahydrate (Na₂CO₃.10H₂O)
(iv) Calcium sulphate hemihydrate (CaSO₄. 1/2 H₂O)
Ans. (iii) Sodium carbonate decahydrate (Na₂CO₃.10H₂O)
Q.226. Sodium hydroxide is termed an alkali while Ferric hydroxide is not because:
(i) Sodium hydroxide is a strong base , while ferric hydroxide is a weak base .
(ii) Sodium hydroxide is a base which is soluble in water while ferric hydroxide is also a base but it is not soluble in water.
(iii) Sodium hydroxide is a strong base while ferric hydroxide is a strong acid.
(iv) Sodium hydroxide and Ferric hydroxide both are strong base but the solubility of Sodium hydroxide in water is comparatively higher than that of Ferric hydroxide.
Ans. (ii) Sodium hydroxide is a base which is soluble in water while ferric hydroxide is also a base but it is not soluble in water.
Q.227. Opening and closing of stomata is due to :
(i) High pressure of gases inside the cells .
(ii) Movement of water in and out of the guard cells.
(iii) stimulus of light in a guard cells.
(iv) Diffusion of CO₂ in and out of the guard cells.
Ans. (ii) Movement of water in and out of the guard cells.
Q.228. Water in the root enters due to :
(I) the function of the root to absorb water.
(ii) difference in the concentration of ions between the root and the soil.
(iii) excess water present in the soil .
(Iv) diffusion of water in the roots.
Ans. (ii) difference in the concentration of ions between the root and the soil.
Q.229. Which one of the given statements is incorrect:
(I) DNA has the complete information for a particular characteristic.
(II) DNA is the molecule responsible for the inheritance of characters from parents to offsprings .
(iii) Change in information will produce a different protein.
(iv) characteristics will remain the same even if protein changes.
Ans. (iv) characteristics will remain the same even if protein changes.
Q.230. The magnification of a virtual image of object placed at 0.2 m away from a lens is 0.5 . This lens will be :
(a) a concave lens of focal length 0.1 cm
(b) a concave lens of focal length 0.2 cm
(c) a convex lens of focal length 0.1 m
(d) a convex lens of focal length 0.2 m
Ans. (b) a concave lens of focal length 0.2 cm
Q.231. Sensory nerve of a reflex are carries information from the receptor cells to the :
(I) spinal cord.
(II) brain.
(iii) muscles of the effector organ.
(iv) bones of the receptor organ.
Ans. (i) spinal cord.
Q.232. A cross between pea plant with white flowers (vv) and pea plant with violet flowers (VV) resulted in F2 progeny in which ratio of violet (VV) and white ( vv) flowers will be :
(i) 1 : 1
(ii) 2 :1
(iii) 3:1
(iv) 1 :3
Ans. (i) 1 : 1
Q.233. Two LED bulbs of 12W and 6W are connected in series . If the current through 12W bulb is 0.06A the current through 6W bulb will be :
(i) 0.04A
(ii) 0.06A
(iii) 0.08A
(iv) 0.12A
Ans. (ii) 0.06A
Q.234. The resistance of a resistor is reduced to half of its initial value. If other parameters of the electrical circuit remain unaltered, the amount of heat produced in the resistor will become :
(i) four times
(ii) two times
(iii) half
(iv) one fourth
Ans. (ii) two times
Q.235. Focal length of a convex lens is 2 metre. Power of the lens will be :
(a) +0.5D
(b) -5D
(c) +5D
(d) +50D
Ans. (a) +0.5D
Q.236. Metal oxides generally react with acids, but few oxides of metal also react with bases. Such metallic oxides are :
I. MgO
II. ZnO
III. Al₂O₃
IV. CaO
(a) I and II
(b) II and III
(c) III and IV
(d) I and IV
Ans. (b) II and III
Q.237. In torch lights and head lights of vehicles, the bulb is placed.
(a) between the pole and the focus of the reflector .
(b) very near to the focus of the reflector.
(c) between the focus and centre of curvature of the reflector.
(d) at the centre of curvature of the reflector.
Ans. (b) very near to the focus of the reflector.
Q.238. Bronze is an alloy of
(a) Copper and zinc
(b) Aluminium and tin
(c) Copper,Tin and Zinc
(d) Copper and Tin
Ans. (d) Copper and Tin
Q.239. The thread like structures that develop on a moist slice of bread in Rhizopus are
(a) Sporangia
(b) Filaments
(c) Rhizoids
(d) Hyphae
Ans. (d) Hyphae
Q.240. The power of a concave lens of 50 cm focal length is :
(a) -0.2 D
(b) +0.2 D
(c) -2 D
(d) +2 D
Ans. (c) -2 D
Q.241. The change in focal length of an eye lens in human beings is caused by the action of
(a) optic nerves
(b) ciliary muscles
(c) retina
(d) cornea
Ans. (b) ciliary muscles
Q.242. The magnetic field inside a long straight current carrying solenoid :
(a) is zero
(b) decreases as we move towards its end.
(c) increases as we move towards its end.
(d) is same at all points.
Ans. (d) is same at all points.
Q.243. In an experiment with pea plants, a pure tall plant (TT) is crossed with a pure short plant (tt) . The ratio of pure tall plant to pure short plants in F2 generation will be
(a) 1 : 3
(b) 3 : 1
(C) 1 : 1
(d) 2 : 1
Ans. (C) 1 : 1
Q. 244. Which of the following will allow the electricity to flow through it/them ?
(i) Glucose
(ii) Dry HCl gas
(iii) Alcohol
(iv) Dil. H₂SO₄
(a) (i) and (iii) only
(b) (iv) only
(c) (ii) and (iv) only
(d) (ii), (iii) and (iv)
Ans. (b) (iv) only
Q.245. The power of a convex lens is 2dioptre. Its focal length will be :
(a) 20 cm
(b) 40 cm
(c) 50 cm
(d) 100 cm
Ans. (c) 50 cm
Q. 246. How much work is done in moving a charge of 3 C across two points having a potential difference of 12 V ?
(a) 4 J
(b) 36 J
(c) 54 J
(d) 216 J
Ans. (b) 36 J
Q. 247. MnO₂ + x HCl ͢ MnCl₂ + y H₂O + z Cl₂
In order to balance the above chemical equation, the values of x, y and z respectively are :
(a) 6, 2, 2
(b) 4, 1, 2
(c) 4, 2, 1
(d) 2, 2, 1
Ans. (c) 4, 2, 1
Q. 248. Which of the following metals do not corrode in moist air ?
(a) Copper
(b) Iron
(c) Gold
(d) Silver
Ans. (c) Gold
Q.249. The focal length of a lens of power -5D will be :
(a) -0.2 m
(b) -0.5m
(c) 0.5 m
(d) 0.8 m
Ans. (a) -0.2 m
Q. 250. If the current I through a resistor is increased by 100% (at constant temperature) , the increase in power dissipated will be
(a) 100%
(b) 200%
(c) 300%
(d) 400%
Ans. (c) 300%
Q.251. The number of electrons in the outermost shell of the atom of a non-metal can be :
(a) 1, 2 or 3
(b) 3, 4 or 5
(c) 5, 6 or 7
(d) 5, 6 or 8
Ans. (c) 5, 6 or 7
Q. 252. Among the following, the metal with lowest density is :
(a) Lithium
(b) Lead
(c) Magnesium
(d) Aluminium
Ans. (a) Lithium
Q. 253. Which of the following is an example of endothermic process ?
(a) Formation of slaked lime
(b) Decomposition of vegetable matter into compost
(c) Dissolution of ammonium chloride in water
(d) Digestion of food in our body
Ans. (c) Dissolution of ammonium chloride in water
Q. 254. When zinc reacts with sodium hydroxide, the product formed is :
(a) Sodium oxide
(b) Sodium zincate
(c) Zinc hydroxide
(d) Zinc oxide
Ans. Sodium zincate
Q. 255. For verifying Ohm’s law, we design an electric circuit diagram in which we show the arrangement of different circuit components . We find that with respect to the resistor, the :
(a) ammeter is connected in parallel and the voltmeter in series.
(b) ammeter is connected in series and the voltmeter in parallel.
(c) ammeter and voltmeter are both connected in series.
(d) ammeter and voltmeter are both connected in parallel.
Ans. (b) ammeter is connected in series and the voltmeter in parallel.
Q. 256. An object is placed in front of a convex mirror at infinity. According to the New Cartesian Sign Convention, the sign of the focal length and the sign of the image distance in this case are respectively:
(a) + , -
(b) - , +
(c) - , -
(d) + , +
Ans. (d) + , +
Q. 257. When an ‘X’ bearing sperm fertilises the egg, the resulting zygote has the following combination of chromosomes :
(a) 44 + XX
(b) 44 + XY
(c) 22 + XX
(d) 22 + XY
Ans. (a) 44 + XX
Q. 258. Sphincter muscles are present at the exit of :
(a) Stomach and small intestine
(b) Stomach and anus
(c) Small intestine and large intestine
(d) Oesophagus and stomach
Ans. (b) Stomach and anus
Q. 259. During vigorous exercise, the occurrence of cramps in the outer muscles of an athlete is due to the conversion of pyruvate to :
(a) Glucose
(b) Ethanol
(c) Lactic acid
(d) Lactose
Ans. (c) Lactic acid
Q. 260. Plants which bear unisexual flowers are :
(a) Mustard and Papaya
(b) Hibiscus and Watermelon
(c) Mustard and Hibiscus
(d) Watermelon and Papaya
Ans. (d) Watermelon and Papaya
Q. 261. In a resistive circuit if the current is increased to two times, the percentage change in the amount of heat dissipated in the circuit would be :
(a) 400%
(b) 300%
(c) 200%
(d) 100%
Ans. (b) 300%
Q. 262. A metal ribbon ‘X’ burns in oxygen with a dazzling white flame forming a white ash ‘Y’ . The correct description of X, Y and the type of reaction is :
(a) X = Ca ; Y = CaO ; Type of reaction = Decomposition
(b) X = Mg ; Y = MgO ; Type of reaction = Combination
(c) X = Al ; Y = Al₂O₃ ; Type of reaction = Thermal decomposition
(d) X = Zn ; Y = ZnO ; Type of reaction = Endothermic
Ans. (b) X = Mg ; Y = MgO ; Type of reaction = Combination
Q. 263. In an ecosystem life should begin with :
(a) producer
(b) first consumer
(c) secondary consumer
(d) decomposer
Ans. (a) Producer
Q.264. Many food chains of different organisms formed.
(a) Ecological pyramid
(b) An ecosystem
(c) Food web
(d) None of these
Ans. (c) Food web
Q.265. Substances which are decomposed by microscopic organisms are known as :
(a) Disposable
(b) Biodegradable
(c) Non-biodegradable
(d) None of these
Ans. (b) Biodegradable
Q.266. Which of the following is correct about food chain ?
(a) Eagle , grass, deer, lion
(b) Grass, evergreen plants, lion, tiger, eagle
(c) Lion, deer, tiger, insects, eagle
(d) Grass, deer, rabbit, insects
Ans. (a) Eagle , grass, deer, lion
Q.267. Which of the following organism help in recycling of substances ?
(a) Producer
(b) Decomposer
(c) Consumer
(d) None of these
Ans. (c) Consumer
Q.268. What will happen when a food chain does not contain primary consumers ?
(a) Population of producer is decreased
(b) Population of producer is increased
(c) Population of secondary consumer is decreased
(d) Both (b) and (c) are correct
Ans. (d) Both (b) and (c) are correct
Assertion (A) and Reason (R) Based Questions
ayushagarwalmaths
Answer these questions selecting the appropriate option given below:
a) Both A and R are true, and R is the correct explanation of A.
b) Both A and R are true, and R is not the correct explanation of A.
c) A is true but R is false.
d) A is false but R is true.
Q.1. Assertion: Rusting of Iron is endothermic in nature.
Reason: As the reaction is slow, the release of heat is barely evident.
Ans. d) Assertion is false but Reason is true.
Q. 2. Assertion: Probability of survival of an organism produced through sexual reproduction is more than that of organism produced through asexual mode.
Reason: Variations provide advantages to individuals for survival.
Ans. a) Both A and R are true and R is the correct explanation of A.
Q. 3. Assertion : A compass needle is placed near a current carrying wire. The deflection of the compass needle decreases when the magnitude of the current in the wire is increased.
Reason : The strength of a magnetic field at a point near the conductor increases on increasing the current.
Ans. d) Assertion is false but Reason is true.
Q. 4. Assertion: Biodegradable substances result in the formation of compost and natural replenishment.
Reason: It is due to breakdown of complex inorganic substances into simple organic substances.
Ans. c) A is true but R is false.
Q. 5. Assertion: Silver bromide decomposition is used in black and white photography.
Reason: Light provides energy for this exothermic reaction.
Ans. c) A is true but R is false.
Q. 6. Assertion: Height in pea plants is controlled by efficiency of enzymes and is thus genetically controlled.
Reason: Cellular DNA is the information source for making proteins in the cell.
Ans. a) Both A and R are true, and R is the correct explanation of A.
Q. 7. Assertion: Amphibians can tolerate mixing of oxygenated and deoxygenated blood.
Reason: Amphibians are animals with two chambered heart.
Ans. c) A is true but R is false.
Q. 8. Assertion: On freely suspending a current – carrying solenoid, it comes to rest in Geographical N-S direction.
Reason : One end of current carrying straight solenoid behaves as a North pole and the other end as a South pole, just like a bar magnet.
Ans. a) Both A and R are true, and R is the correct explanation of A.
Answer these questions selecting the appropriate option given below:
a) Both A and R are true, and R is the correct explanation of A.
b) Both A and R are true, and R is not the correct explanation of A.
c) A is true but R is false.
d) A is false but R is true.
Q. 9. Assertion (A) : MnO2 + 4HCl ͢ MnCl2 + 2H2O + Cl2 is a redox reaction.
Reason : In this reaction, HCl is oxidised to Cl2 and MnO2 is reduced to MnCl2 .
Ans. a) Both A and R are true, and R is the correct explanation of A.
Q.10. Assertion (A) : Cytokinins are present, in greater concentration in areas of rapid cell division such as fruits and seeds.
Reason: cytokinins promote cell division.
Ans. a) Both A and R are true, and R is the correct explanation of A.
Q.11. Assertion (A) : A rainbow is an artificial spectrum of white light appearing in the sky after a rain shower.
Reason: The water droplets act like small prisms.
Ans. d) A is false but R is true.
Q.12. Assertion : Each human trait is influenced by both paternal and maternal DNA.
Reason: As compared to the father, the mother contributes more amount of genetic material to the child.
Ans. c) A is true but R is false.
Q.13. Assertion (A) : The strength of the magnetic field produced at the centre of a current carrying circular coil increases on increasing the number of turns in it.
Reason: The current in each circular turn has the same direction and the magnetic field due to each turn then just adds up.
Ans. a) Both A and R are true, and R is the correct explanation of A.
Q.14. Assertion (A) : The anaerobic respiration which takes place in yeast, has one of the end products as an acid.
Reason: During anaerobic respiration, there is incomplete breakdown of glucose.
Ans. d) A is false but R is true.
Q.15. Assertion (A) : Genes inherited from the parents decide the sex of a child.
Reason: X chromosome in a male child is inherited from his father.
Ans. c) A is true but R is false.
Q.16. Assertion (A) : The colour of aqueous solution of copper sulphate turns colourless when a piece of lead is added to it.
Reason: Lead is more reactive than copper, and hence displaces copper from its salt solution.
Ans. a) Both A and R are true, and R is the correct explanation of A.
Answer these questions selecting the appropriate option given below:
a) Both A and R are true, and R is the correct explanation of A.
b) Both A and R are true, and R is not the correct explanation of A.
c) A is true but R is false.
d) A is false but R is true.
Q.17. Assertion (A): Sodium, calcium and magnesium are obtained by the electrolysis of their molten oxides.
Reason: These metals have more affinity for oxygen than carbon.
Ans. d) A is false but R is true.
Q.18. Assertion (A) : Magnetic field lines do not intersect each other.
Reason: magnetic field lines are imaginary lines , the tangent to which at any point gives the direction of the field at that point.
Ans. b) Both A and R are true, and R is not the correct explanation of A.
Q.19. Assertion (A) : when a becterium divides into two, and the resultant two bacteria divide again, the four bacteria produced would be almost similar.
Reason: DNA copying involves small inaccuracies in the reproduction process.
Ans. a) Both A and R are true, and R is the correct explanation of A.
Q.20. Assertion (A) : A person suffering from myopia cannot see the distant objects clearly.
Reason : A converging lens is used for the correction of myopic eye as it can form real as well as virtual images of the objects placed in front of it.
Ans. c) A is true but R is false.
Q.21. Assertion (A) : A current carrying straight conductor experiences a force when placed perpendicular to the direction of magnetic field.
Reason: The net charge on a current carrying conductor is always zero.
Ans. b) Both A and R are true, and R is not the correct explanation of A.
Q.22. Assertion (A) : The inner walls of the Small intestine have finger like projections called villi which are rich in blood.
Reason : These villi have a large surface area to help the small intestine in completing the digestion of food.
Ans. c) A is true but R is false.
Q.23. Assertion (A) : In humans , if gene (B) is responsible for black eyes and gene (b) is responsible for brown eyes, then the colour of eyes of the progeny having gene combination Bb,bb or BB will be black only.
Reason : The black colour of eyes is a dominant trait.
Ans. d) A is false but R is true.
Q.24. Assertion (A) : Reaction of Quicklime with water is an exothermic reaction.
Reason : Quicklime reacts vigorously with water releasing a large amount of heat.
Ans. a) Both A and R are true, and R is the correct explanation of A.
Answer these questions selecting the appropriate option given below:
a) Both A and R are true, and R is the correct explanation of A.
b) Both A and R are true, and R is not the correct explanation of A.
c) A is true but R is false.
d) A is false but R is true.
Q.25. Assertion (A) : The magnetic field lines around a current carrying straight wire do not intersect each other.
Reason : The magnitude of the magnetic field produced at a given point increases as the current through the wire increases.
Ans. b) Both A and R are true, and R is not the correct explanation of A.
Q.26. Assertion (A) : The walls of atria are thicker than those of the ventricles.
Reason : Ventricles have to pump blood into various organs at high pressure.
Ans. d) A is false but R is true.
Q.27. Assertion (A) : Human populations show a great deal of variations in traits.
Reason : All variations in a species have equal chances of surviving in the environment in which they live.
Ans. c) A is true but R is false.
Q.28. Assertion(A) : In the following reaction
ZnO + C ͢ Zn + CO
ZnO undergoes reduction.
Reason : carbon is a reducing agent that reduces ZnO to Zn.
Ans. a) Both A and R are true, and R is the correct explanation of A.
Q.29. Assertion (A) : Melting point and boiling point of ethanol are lower than that of sodium chloride.
Reason : The forces of attraction between the molecules of ionic compounds are very strong.
Ans. a) Both A and R are true, and R is the correct explanation of A.
Q.30. Assertion (A) : An ecosystem consists of biotic components and abiotic components.
Reason : Biotic and abiotic components play important roles for the sustenance of life and work independently in all ecosystems.
Ans. c) A is true but R is false.
Q.31. Assertion (A) : It is advised that while diluting an acid one should add water to acid not acid to water keeping the solution continuously stirred.
Reason: The process of dissolving an acid into water is highly exothermic.
Ans. d) A is false but R is true.
Q.32. Assertion (A) : Amoeba takes in food using finger like extensions of the cell surface.
Reason : In all unicellular organisms, the food is taken in by the entire cell surface.
Ans. c) A is true but R is false.
Answer these questions selecting the appropriate option given below:
a) Both A and R are true, and R is the correct explanation of A.
b) Both A and R are true, and R is not the correct explanation of A.
c) A is true but R is false.
d) A is false but R is true.
Q. 33. Assertion (A) : In the reaction, Na2SO4 + BaSO4 ͢ BaSO4 + 2NaCl , sodium chloride is precipitated.
Reason (R) : When an aqueous solution is added to another aqueous solution, an insoluble substance is formed , which is called precipitate.
Ans. (d) A is false but R is true.
Q. 34. Assertion (A) : Variation is useful for the survival of a species over time.
Reason (R) : The process of DNA copying will have variation each time because biochemical reactions are not reliable.
Ans. b) Both A and R are true, and R is not the correct explanation of A.
Q. 35. Assertion (A) : A hormone called abscisic acid inhibits growth in plants.
Reason (R) : The role of auxins is opposite to that of abscisic acid in plants.
Ans. (b) Both A and R are true, and R is not the correct explanation of A.
Q. 36. Assertion (A) : Left atrium receives oxygenated blood from pulmonary vein.
Reason (R) : Right atrium transfers deoxygenated blood to the right ventricle, which pumps it to the lungs for oxygenation.
Ans. (b) Both A and R are true, and R is not the correct explanation of A.
Q. 37. Assertion (A) : Sodium oxide is an amphoteric oxide.
Reason (R) : Metal oxides which react with both acids as well as bases are known as amphoteric oxides.
Ans. (d) A is false but R is true.
Q. 38. Assertion (A) : The angle through which a ray of light bends on passing through a prism is called the angle of deviation.
Reason (R) : The peculiar shape of a prism makes the emergent ray bend at an angle to the direction of the incident ray.
Ans. (a) Both A and R are true, and R is the correct explanation of A.
Q. 39. Assertion (A) : The energy which passes to the herbivores does not come back to autotrophs.
Reason (R) : The flow of energy in a food chain is unidirectional.
Ans. (a) Both A and R are true, and R is the correct explanation of A.
Q. 40. Assertion (A) : Testes in human males are located outside the abdominal cavity in scrotum.
Reason (R) : Scrotum provides a lower temperature than the normal body temperature for sperm formation.
Ans. (a) Both A and R are true, and R is the correct explanation of A.
More questions Coming Soon
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