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CBSE

Subject

Physics

NEET Physics : Thermodynamics

Multiple Choice Questions

121.

The neutral temperature of a thermocouple is 300°C. What is the inversion temperature, if the temperature of cold junction is l0°C?

590°C
610°C
310°C
290°C

122.

A gas at state A changes to state B through path I and II as shown in figure. The change in internal energy is ΔU₁ and ΔU₂ respectively. Then :

ΔU₁ > ΔU₂
ΔU₁ < ΔU₂
ΔU₁ = ΔU₂
ΔU₁ = ΔU₂ = 0

123.

In an adiabatic process, the state of a gas is changed from P₁, V₁, T₁ to P₂, V₂, T₂. Which of the following relation is correct?

$T_{1} V_{1}^{γ - 1} = T_{2} V_{2}^{γ - 1}$
$P_{1} V_{1}^{γ - 1} = P_{2} V_{2}^{γ - 1}$
$T_{1} P_{1}^{γ} = T_{2} P_{2}^{γ}$
$T_{1} V_{1}^{γ} = T_{2} V_{2}^{γ}$

124.

Boyle's law is applicable for an

adiabatic process
isothermal process
isobaric process
isochoric process

125.

For adiabatic process $(γ = \frac{C_{p}}{C_{V}})$

$p^{γ} V = constant$
${Tp}^{γ} V = constant$
${pV}^{γ} = constant$
pV = constant

126.

An ideal gas heat engine operates in Carnot cycle between 227°C and 127 $°$ C. It absorbs 6 x 10⁴ cal of heat at higher temperature. Amount of heat converted into work is

1.2 x 10⁴ cal
2.2 x 10⁴ cal
6.0 x 10⁴ cal
4.8 x 10⁴ cal

127.

A Carnot engine works between temperature 72°C and 27°C. The efficiency of the engine is

70 %
30 %
0 %
10 %

128.

During adiabatic expansion, the volume of air increases by 4%. The percentage decrease in the pressure will be

3.2 %
5.6 %
1.5 %
4.8 %

129.

An ice at -50°C is to be converted into vapour at 100°C. The heat required in this process is

1028 calorie
624 calorie
745 calorie
810 calorie

130.

If 300 ml of a gas at 27° C is cooled to 7° C at constant pressure, then its final volume will be

540 mL
350 mL
280 mL
135 mL

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