NIELIT Scientist B 2020 November: 16

Question

Directions: For the $\text{Assertion (A)}$ and $\text{Reason (R)}$ below, choose the correct alternative from the following:

1. Both $(A)$ and $(R)$ are true and $(R)$ is the correct explanation of $(A)$
2. Both $(A)$ and $(R)$ are true and $(R)$ is not the correct explanation of $(A)$ 
3. $(A)$ is true but $(R)$ is false
4. $(A)$ is false but $(R)$ is true

$\text{Assertion (A):}$

Ventilators are provided near the roof.

$\text{Reason (R):}$

Conduction takes place better near the roof.

• A. $I$
• B. $II$
• C. $III$
• D. $IV$

Answer 1

Form of Heat Transfer	Definition	Example
Conduction	Heat transfer by direct contact between objects or substances	Feeling the warmth of a metal spoon in a hot cup of coffee.
Convection	Heat transfer by the movement of fluids (liquids or gases)	A hot cup of tea warming your hands
Radiation	Heat transfer by electromagnetic waves	Feeling the warmth of the sun.

because hot air rises up, we need ventilators to let the air out. that is the reason.