61- Atmosphere is composed of Nitrogen and Oxygen, which makes up to about ……….of clean dry area.
(A) 2%
(B) 21%
(C) 91%
(D) 99%
62- Which of the following shows the correct composition of gas?
(a) Nitrogen = 78%
(b) Oxygen = 21%
(c) Other gases like carbon dioxide, argon and other = 1%
(A) Only a
(B) Only b
(C) None of the above
(D) All are correct option
63- …………….gas helps in the growth of living organism.
(A) Nitrogen
(B) Oxygen
(C) Argon
(D) Carbon dioxide
64- …………………..gas is important as it absorbs heat radiated by the earth and helps in keeping the earth warm.
(A) Oxygen
(B) Carbon Dioxide
(C) Argon
(D) Nitrogen
65- The ……………………of the atmosphere varies with height. It is maximum at sea level and decreases with height.
(A) Temperature
(B) Speed
(C) Density
(D) None of the above
66- Why do climber’s experiences breathing problem while climbing the mountain?
(A) Due to absence of carbon dioxide gas
(B) Due to increase in the density of air
(C) Due to decrease in the density of air
(D) None of the above
67- Air moves from …………pressure to low pressure area
(A) high
(B) Low
(C) Both A and B
(D)None of the above
68- The …………is the narrow contact between water, air and land.
(A) Lithosphere
(B) Biosphere
(C) Atmosphere
(D) Hydrosphere
69- Emission from industries, thermal power plant, and vehicles pollute the …………..
(A) Water
(B) Land
(C) Air
(D) All of the above
70- Global warming is due to increase in ………………….
(A) N
(B) O2
(C) H2O
(D) CO2
ANSWERS:
61-(D), 62-(D), 63-(A), 64-(B), 65-(C), 66-(C), 67-(A),68-(B), 69-(D), 70-(D)