71. The two main contents of the air are
(A) Nitrogen and Oxygen
(B) Nitrogen and Hydrogen
(C) Oxygen and Hydrogen
(D) Oxygen and Carbon Dioxide
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72. The atmosphere is divided into ……….. layers.
(A) One
(B) Two
(C) Three
(D) four
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73. The Only natural Satellite on the earth is
(A) Moon
(B) Rohini
(C) Insat-IB
(D) Sputnik
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74. Sound cannot travel on the moon due to the absence of
(A) Gravity
(B) Water
(C) Air
(D) All of these
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75. Snakes move with the help of
(A) Fin
(B) Scales
(C) Legs
(D) Forelimbs
Answer:
Explanation: