61. A can run 1 km in 4 min 54 sec and B in 5 min. How many metres start can A give B in a Km race, so that the race may end in a dead heat?
A. 16 m
B. 18 m
C. 20 m
D. 14.5 m
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62. Washing soda is the common name for-
A. Calcium carbonate
B. Calcium bicarbonate
C. Sodium carbonate
D. Sodium bicarbonate
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63. Amlagams are-
A. Alloys which contain carbon
B. Alloys which have great resistance to abrasion
C. Alloys which contain mercury as one of the contents
D. Highly coloured alloys
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64. The main important feature of neutron bomb is that when it is dropped on a city, it would damage-
A. Both the living organisms and buildings
B. The buildings but not the living organisms
C. The living organisms but spare buildings
D. None of the above
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65. In which of the following processes light energy is converted into chemical energy?
A. Respiration
B. Fermentation
C. Photosynthesis
D. Photorespiration
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66. A chronometer measures-
A. Sound waves
B. Time
C. Water waves
D. Colour contrast
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67. Nautical mile is a unit of distance used in-
A. Astronomy
B. Navigation
C. Road mile
D. Measuring the boundaries of a nation
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68. Very small time intervals are accurately measured by the-
A. Pulsars
B. Quart Clocks
C. Atomic clocks
D. White dwarfs
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69. The principle of working of periscope is based on-
A. Reflection only
B. Refraction only
C. Reflection and Refraction
D. Reflection and Interference
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70. Hardware is related to-
A. Calculator
B. Computer
C. Acids
D. Heavy metals
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71. The Spring balance works on the principle of-
A. Boyle’s law
B. Hooke’s law
C. Bernoulli’s principle
D. Pascal’s law
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72. Which of the following statements is correct?
A. Dynamo converts electrical energy into electrical energy and electrical energy
B. Dynamo converts mechanical energy into electrical energy and electrical motor converts electrical into mechanical energy
C. Both dynamo and electric motor converts electrical energy into mechanical energy
D. Both dynamo and electric motor converts mechanical energy into electrical energy
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73. Which of the following works on Bernoulli’s principle?
A. Gas lighter
B. Gas stove
C. Bunsen burner
D. None of these
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74. Recoil of a gun is an example of-
A. conservation of mass
B. conservation of energy
C. conservation of P.E into K.E
D. conservation of linear momentum
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75. Wisdom teeth normally grow during the age of-
A. 12-15 years
B. 17-30 years
C. 34-40 years
D. 40-50 years
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76. A person will have brown eyes, blue eyes or black eyes depending upon the particular pigment present in the-
A. Pupil
B. Cornea
C. Iris
D. Choroid
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77. A person with AB blood group is sometimes called a universal recipient because of the-
A. Presence of antibodies in his blood
B. Lack of antibodies in his blood
C. Lack of antigen in his blood
D. Lack of both antigens and antibodies in his blood
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78. The largest gland in the human body is-
A. Heart
B. Liver
C. Kidney
D. Brain
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79. The maximum temperature the human skin can tolerate without getting blisters is-
A. 400 C
B. 600 C
C. 800 C
D. None of these
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80. An ant can see the object all around it due to the presence of-
A. Simple eyes
B. Eyes over the head
C. Well developed eyes
D. Compound eyes
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