Question

Match the column I with column II and mark the appropriate choice

Column I	Column II
(A) Troposphere	(i) Prevents UV rays coming to earth
(B) Stratosphere	(ii) Ionization of gases
(C) Mesosphere	(iii) Maintenance of heat balance
(D) Thermosphere	(iv) Non-propagation of sound waves

• A. $\left(A\right)\to \left(i\right),\left(B\right)\to \left(iv\right),\left(C\right)\to \left(iii\right),\left(D\right)\to \left(i\right)$
• B. $\left(A\right)\to \left(iv\right),\left(B\right)\to \left(ii\right),\left(C\right)\to \left(i\right),\left(D\right)\to \left(iii\right)$
• C. $\left(A\right)\to \left(iii\right),\left(B\right)\to \left(i\right),\left(C\right)\to \left(iv\right),\left(D\right)\to \left(ii\right)$
• D. $\left(A\right)\to \left(i\right),\left(B\right)\to \left(iii\right),\left(C\right)\to \left(ii\right),\left(D\right)\to \left(iv\right)$

Answer 1

Answer: (C)

$\left(A\right)\to \left(iii\right),\left(B\right)\to \left(i\right),\left(C\right)\to \left(iv\right),\left(D\right)\to \left(ii\right)$

(A) The troposphere is the thickest layer of the Earth's atmosphere containing half of the Earth's atmosphere, weather occurs in this layer, so this layer maintains the balance of heat.

(B) Stratosphere contains the Ozone layer which prevents the incoming UV rays in the Earth.

(C) The mesosphere is the layer where the meteors or rock fragments turn up and this layer becomes too thin to carry sound waves.

(D) In Thermosphere, UV radiation causes photoionization/ photodissociation of molecules; creating ions in the ionosphere.