71. Which one of the following plant tissues has dead cells ?
(a) Epidermis
(b) Parenchyma
(c) Collenchyma
(d) Sclerenchyma
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72. Cartilage is NOT found in
(a) larynx
(b) nose
(c) ear
(d) urinary bladder
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73. Two planets orbit the Sun in circular orbits, with their radius of orbit as R1 = R and R2 = 4R. Ratio of their periods (T1/T2) around the Sun will be
(a) 1/16
(b) ⅛
(c) ¼
(d) ½
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74. A metallic wire having resistance of 20 ᘯ is cut into two equal parts in length. These parts are then connected in parallel. The resistance of this parallel combination is equal to
(a) 20 ᘯ
(b) 10 ᘯ
(c) 5 ᘯ
(d) 15 ᘯ
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75. Light of uniform intensity impinges perpendicularly on a totally reflecting surface. If the area of the surface is halved, the radiation force on it will become
(a) double
(b) half
(c) four times
(d) one fourth
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76. The part of the human eye on which the image is formed is
(a) pupil
(b) cornea
(c) retina
(d) iris
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77. Consider the following image:
A proton enters a magnetic field at right angles to it, as shown above. The direction of force acting on the proton will be
(a) to the right
(b) to the left
(c) out of the page
(d) into the page
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78. Which one of the following statements about sound is NOT correct?
(a) Sound travels at a speed slower than the speed of light
(b) Sound waves are transverse waves
(c) Sound waves are longitudinal waves
(d) Sound travels faster in moist air than in dry air
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79. When the short circuit condition occurs, the current in the circuit
(a) becomes zero
(b) remains constant
(c) increases substantially
(d) keeps on changing randomly
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80. Which one of the following is NOT a component of human male reproductive system?
(a) Cervix
(b) Urethra
(c) Seminal vesicle
(d) Vas deferens
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81. Which one of the following is NOT a reason of decrease in biodiversity ?
(a) Large scale deforestation
(b) Exploitation of forest produce
(c) Maintaining sacred groves
(d) Encroachment in forest areas
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82. Which one of the following is NOT a cause of depletion in groundwater ?
(a) Afforestation
(b) Loss of forests
(c) Excessive pumping of ground water
(d) Construction of large scale con crete buildings
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83. Which one of the following types of radiations has the smallest wave length ?
(a) Microwaves
(b) Infra-red
(c) Visible light
(d) X-rays
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84. The instrument used for detecting the presence of electric current in a circuit is
(a) Refractometer
(b) Galvanometer
(c) Viscometer
(d) Diffractometer
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85. Which one of the following is the largest composition in biogas ?
(a) Carbon dioxide
(b) Methane
(c) Hydrogen
(d) Hydrogen sulphide
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86. The Sun appears reddish during sunrise and sunset. The phenomenon in optics which is responsible for this appearance of the Sun is
(a) Reflection
(b) Total internal reflection
(c) Scattering
(d) Interference
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87. A lens has a power of +2.0 Dioptre. Which one of the following statements about the lens is true ?
(a) The lens is concave and has a focal length of 0.5 metre
(b) The lens is convex and has a focal length of 2.0 metre
(c) The lens is convex and has a focal length of 0.5 metre
(d) The lens is concave and has a focal length of 2.0 metre
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88. At nearly 70°C, sodium bicarbonate shows the property of gradually decomposing, which makes it usable in bakery products. The product of decomposition responsible for this use of sodium bicarbonate is
(a) Carbon dioxide
(b) Hydrogen
(c) Water vapour
(d) Oxygen
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89. Number of molecules of water of crystallization in copper sulphate, sodium carbonate and Gypsum are
(a) 5, 10 and 2 respectively
(b) 10, 2 and 5 respectively
(c) 5, 2 and 10 respectively
(d) 2, 5 and 10 respectively
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90. Which one of the following is the correct sequence of change in colours when a turmeric stain on white clothes is scrubbed by soap and then washed with water?
(a) Yellow – pink – blue
(b) Yellow – reddish brown – yellow
(c) Yellow – reddish brown – blue
(d) Yellow – blue – pink
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Thank you sir
Sir mujhe dono paper ke answer key beej dijye please
the official answer key is not available.