# NEET Physics Thermodynamics Questions Solved

NEET - 2017

A carnot engine having an efficiency of$\frac{1}{10}$th of heat engine, is used as a refrigerator. If the work done on the system is 10 J, the amount of energy absorbed from the reservoir at lower temperature is -

(a) 1 J

(b) 90 J

(c) 99 J

(d0 100 J

(b) Consider schematic diagram for a carnot engine as shown below.

In case of engine,

engine efficiency=

or

when this engine is reversed, it takes in work W and heat ${q}_{2}$ from cold reservoir and rejects 100 J of heat to hot reservoir.

Difficulty Level:

• 18%
• 47%
• 18%
• 19%
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