Q.11 Ozone layer is present in
(A) Troposphere
(B) Ionosphere
(C) Stratosphere
(D) Exosphere
Q.12 Which is the lowest layer of the atmosphere?
(A) Troposphere
(B) Stratosphere
(C) Mesosphere
(D) Thermosphere
Q.13 Which one of the following is a major constituent of Biogas?
(A) Carbon dioxide
(B) Methane
(C) Hydrogen
(D) Nitrogen Dioxide
Q.14 Sea breeze is formed during
(A) Day time
(B) Night time
(C) Both
(D) Seasonal
Q.15 The Refrigerant 'FREON' is
(A) Calcium Tetra Flouride
(B) Diflouro Dichloro Methane
(C) Flourspar and Felspar
(D) Hydrofluosilicic Acid
Q.16 Now a days, Yellow lamps are frequently used as street lights. Which among the following gases, is used in these lamps?
(A) Sodium
(B) Neon
(C) Hydrogen
(D) Nitrogen
Q.17 The atmospheric air is held to the earth by
(A) Gravity
(B) Winds
(C) Clouds
(D) Rotation of the earth
Q.18 The Noble Gas used for the treatment of cancer is ___?
(A) Helium
(B) Argon
(C) Krypton
(D) Radon
Q.19 The optimum dissolved oxygen level (in mg/litre) required for survival of aquatic organisms is
(A) 4 – 6
(B) 2 – 4
(C) 8 – 10
(D) 12 - 16
Q.20 Troposphere is the hottest part of the atmosphere because
(A) it is closest to the Sun
(B) there are charged particles in it
(C) it is heated by the Earth’s surface
(D) heat is generated in it
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