NCERT Class 11 Physics Chapter 12 Thermodynamics CBSE Board Sample Problems

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MCQ I

Question 1:

An ideal gas undergoes four different processes from the same initial state (Fig. 12.1). Four processes are adiabatic, isothermal, isobaric and isochoric. Out of 1, 2, 3 and 4 which one is adiabatic?

Gas undergoes

Gas Undergoes

(a) 4

(b) 3

(c) 2

(d) 1

Answer: (c) adiabatic

A is isobaric process, D is isochoric. Of B and C, B has the smaller slope (magnitude) hence is isothermal. Remaing process is adiabatic.

Question 2:

If an average person jogs, hse produceshis is removed by the evaporation of sweat. The amount of sweat evaporated per minute (assuming 1 kg requires cal for evaporation) is

(a)

(b)

(c)

(d)

Answer: (a)

Question 3:

Consider diagram for an ideal gas shown in Fig 12.2.

P-V diagram for an ideal gas

P-V Diagram for an Ideal Gas

Out of the following diagrams (Fig. 12.3), which represents the T-P diagram?

T-P diagram

T-P Diagram

T-P diagram

T-P Diagram

T-P diagram

T-P Diagram

T-P diagram

T-P Diagram

(a) (iv)

(b) (ii)

(c) (iii)

(d) (i)

Answer: (c)

Question 4:

An ideal gas undergoes cyclic process ABCDA as shown in given P-V diagram (Fig. 12.4).

The amount of work done by the gas is

P-V diagram

P-V Diagram

(a)

(b)

(c)

(d)

Answer: (b)

Question 5:

Consider two containers A and B containing identical gases at the same pressure, volume and temperature. The gas in container A is compressed to half of its original volume isothermally while the gas in container B is compressed to half of its original value adiabatically. The ratio of final pressure of gas in B to that of gas in A is

(a)

(b)

(c)

(d)

Answer: (a)

Question 6:

Three copper blocks of masses and respectively are brought into thermal contact till they reach equilibrium. Before contact, they were at . Assuming there is no heat loss to the surroundings, the equilibrium temperature T is (s is specific heat of copper)

(a)

(b)

(c)

(d)

Answer: (b)

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