A) The atmosphere has definite upper limits but gradually thins until it becomes imperceptible.
B) The atmosphere, has no definite upper limits but gradually thins until it becomes imperceptible.
C) The atmosphere has definite upper limits but gradually thickens until it becomes imperceptible.
D) The atmosphere has no definite upper limits but gradually thickens until it becomes imperceptible.



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1). Assertion (A) Within the mesosphere. Temperature decreases with increasing altitude. Reason (R) This is due to decreasing solar heating and increasing cooling by CO2 radiative emission. A). Both A and R are true, and R is the correct explanation of A
B). Both A and R are true but Ft is not the correct explanation of A
C). A is true but R is false
D). A is false. but R is true
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2). Arrange the following layers of atmosphere vertically from the surface of the Earth 1. Mesosphere 2. Troposphere 3. Stratospbelow . 4. Thermosphere A). 1 2 3 4
B). 2 1 3 4
C). 2 3 1 4
D). 3 4 2 1
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3). Consider the following statements1. 99% of the water vapour in the atmosphere is concentrated in the lowest 16 km. 2. 90% of the water vapour in the atmosphere is concentrated in the lowest 6 km. Which of the statements given above is/are correct? A). Only 1
B). Only 2
C). 1 and 2
D). None of these
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4). Which of the following is considered as the main reason for the Earth"s Magnetism? A). Volcanic activity in the mantle
B). Electric currents in the liquid outer core
C). Interaction of Sun"s electro magnetic radiation with the Earth"s atmosphere
D). Presence of magnetic elements in the Earth"s interior
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5). The weakest zone of Asthenosphere Lies, from the Earth"s surface at roughly a depth that A). 100 km
B). 200 km
C).

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300 km
D). 400 km
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