71. Which one of the following statements regarding lenses is not correct?
(a) A convex lens produces both real and virtual images.
(b) A concave lens produces both real and virtual images
(c) A convex lens can produce images equal, greater and smaller than the size of the object.
(d) A concave lens always produces images smaller than the size of the object.
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72. 10 g of ice at – 10°C is mixed with 10 g of water at 0°C. The amount of heat required to raise the temperature of mixture to 10°C is
(a) 400 cal
(b) 550 cal
(c) 1050 cal
(a) 1200 cal
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73. Which one of the following does not represent the salt, Calcium carbonate ?
(a) Lime water
(b) Limestone
(c) Chalk
(d) Marble
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74. Soaps clean surfaces on the principle based on
(a) Viscosity
(b) Floatation
(c) Elasticity
(d) Surface tension
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75. Which one of the following substances is not a mixture ?
(a) Tin
(b) Sea water
(c) Soil
(d) Air
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76. Which one of the following is termed as ‘Dry ice’?
(a) Ice present in ice-cream
(b) Solid water at Antarctica
(c) Solid state of carbon dioxide
(d) Solid water of ionosphere
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77. Net movement of water from a dilute to a concentrated solution through a selectively permeable membrane is called
(a) Diffusion
(b) Dispersion
(c) Osmosis
(d) Absorption
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78. Blood is a type of
(a) Epithelial tissue
(b) Muscular tissue
(c) Nervous tissue
(d) Connective tissue
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79. Mitochondria are able to produce their own
(a) Nucleus
(b) Proteins
(c) Chloroplasts
(d) Digestive enzymes
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80. Which one of the following statements is correct?
(a) Xylem consists of tracheids, vessels, xylem parenchyma and xylem fibres.
(b) Flexibility in plants is due to sclerenchyma.
(c) Parenchyma have no intercellular spaces.
(d) Xylem consists of sieve plate, sieve tube and companion cells.
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81. Who among the following popularized the use of embryological characters in taxonomy?
(a) Carl Linnaeus
(b) Panchanan Maheshwari
(c) Birbal Sahni
(d) Bentham and Hooker
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82. Water is heated with a coil of resistance connected to domestic supply. The rise of temperature of water will depend on
1. Supply voltage.
2. Current passing through the coil.
3. Time for which voltage is supplied.
Select the correct answer from among the following:
(a) 1, 2 and 3
(b) 1 and 2 only
(c) I only
(d) 2 and 3 only
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83. A pendulum clock is lifted to a height where the gravitational acceleration has a certain value g. Another pendulum clock of same length but of double the mass of the bob is lifted to another height where the gravitational acceleration is g/2. The time period of the second pendulum would be: (in terms of period T of the first pendulum)
(a) √2 T
(b) 1/√2 T
(c) 2√2 T
(d) T
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84. The loudness of sound depends upon the
(a) velocity of sound waves in the medium
(b) amplitude of the sound waves.
(c) frequency of the sound waves.
(d) frequency and velocity of the sound waves.
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85. Two bodies of mass M each are placed R distance apart. In another system, two bodies of mass 2M each are placed distance apart. If F be the gravitational force between the bodies in the first system, then the gravitational force between the bodies in the second system will be
(a) 16 F
(b) 15
(c) 4F
(d) None of the above
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86. Light rays move in straight lines. But through an optical fibre, they can move in any type of zigzag path because
(a) the holes through the fibre are extremely fine.
(b) light rays are absorbed at the entry end and relieved at the exit end of the fibre.
(c) scattering of light occurs inside the fibre.
(d) successive total internal reflections occur as a ray moves through the fibre.
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87. Which one of the following statements regarding cathode rays is not correct ?
(a) Cathode ray particles are electrons.
(b) Cathode ray particles start from anode and move towards cathode.
(c) In the absence of electrical and magnetic fields, cathode rays travel in straight lines.
(d) Television picture tubes are cathode ray tubes.
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88. A very large volume of hydrogen can be accommodated by making
(a) non-metallic hydrides.
(b) hydrogen peroxide.
(c) non-stoichiometric hydrides.
(d) alkali metal hydrides.
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89. Which one of the following is not a monatomic element ?
(a) Copper
(b) Helium
(c) Iodine
(d) Barium
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90. Which one of the following represents the correct order of electron releasing tendency of metals?
(a) Zn > Cu > Ag
(b) Ag > Cu > Zn
(c) Cu > Zn > Ag
(d) Cu > Ag > Zn
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It is very helpful.You guys did a very excellent work by providing the answers of the questions and again thanks a lot.
Some r wrng
it is very helpful for the student and when they appear next time for the exam they read the question paper from here as well as answer of the questions………..
The key answer of question no. 125 is a wrong . The correct answer is ( C ) as at the upper boundary of tropopause the temperature is -50 degree C.
It’s really help full
It’s really helpful by providing answer key of NDA paper , now we can easily clear over thoughts accordingly ! But some of the answer s are wrong
Po hmke
It’s really helpfull
ans of ques no.70 is wrong
ans of ques no.70 is wrong. please check your ans