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CBSE

NEET Physics : Thermodynamics

Multiple Choice Questions

31.

Energy is being emitted from the surface of a black body at 127°C the rate of 1.0 x 10⁶ J/sm². The temperature of the black body at which the rate of energy emission is 16.0 x 10° J/sm² will be

754⁰C
527⁰C
254⁰C
508⁰C

32.

A sample of 0.1 g of water at 100°C and normal pressure (1.013 × 105 Nm^–2) requires 54 cal of heat energy to convert to steam at 100°C. If the volume of the steam produced is 167.1 cc, the change in internal energy of the sample, is

104.3 J
208.7 J
84.5 J
42.2 J

33.

The volume (V) of a monatomic gas varies with its temperature (T), as shown in the graph. The ratio of work done by the gas, to the heat absorbed by it, when it undergoes a change from state A to state B, is

34.

Air is expanded from 50 litres to 150 litres at atmosphere the external work done is (1 atmospheric pressure =1 $\times$ $10^{5} N / m^{2}$ )

$2 \times 10^{- 8} J$
$2 \times 10^{4} J$
200J
2000J

35.

Carnot engine having an efficiency of 1/10 as 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

1 J
90 J
99 J
99 J

36.

Helium at 27⁰C has a volume 8 litres. it is suddenly compressed to a volume of 1 litre. The temperature of the gas will be $(V = \frac{5}{3})$

9327⁰C
1200⁰C
927⁰C
108⁰C

37.

The efficiency of an ideal heat engine working between the freezing point and boiling point of water, is

26.8%
20%
12.5%
6.25%

38.

A small sphere of radius 'r' falls from rest in a viscous liquid. As a result, heat is produced due to viscous force. The rate of production of heat when the sphere attains its terminal velocity, is proportional to