KVPY Stream SB-SX (Class 12 & 1st Year B.Sc.) Physics: Questions 205 - 208 of 268

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Question number: 205

» Thermodynamics » Concept of Temperature

MCQ▾

Question

A body cools down from 600 C to 500 C in 10 minutes. Its temperature comes down to 450 C in next ten minutes. The temperature of surroundings is –

Choices

Choice (4) Response

a.

150 C

b.

400 C

c.

300 C

d.

550 C

Question number: 206

» Thermodynamics » Work in Thermodynamic Process and PV Diagrams

Appeared in Year: 2013

MCQ▾

Question

The three processes in a thermodynamic cycle shown in the figure are: Process 1⟶ 2 is isothermal; Process 2⟶ 3 is isochoric (volume remains constant); Process 3 ⟶ 1 is adiabatic. The total work done by the ideal gas in this cycle is 10 J. The internal energy decreases by 20 J in the isochoric process. The work done by the gas in the adiabatic process is –20 J. The heat added to the system in the isothermal process is

PV diagram of a cycle of three processes

PV Diagram of a Cycle of Three Processes

In figure PV diagram of a cycle of three processes is shown. Process 1 to 2 is isothermal, process 2 to 3 is isochoric and process 3 to 1 is adiabatic.

Choices

Choice (4) Response

a.

0 J

b.

20 J

c.

10 J

d.

30 J

Question number: 207

» Laws of Motion » Law of Conservation of Linear Momentum

MCQ▾

Question

A rifle bullet loses 110th of its velocity in passing through a plank. The least number of such planks required to stop the bullet is –

Choices

Choice (4) Response

a.

20

b.

11

c.

5

d.

10

Question number: 208

» Thermodynamics » Thermodynamic Processes

MCQ▾

Question

The work required to compress adiabatically 2 g of air initially at NTP to 13 of its volume. Density of air at NTP = 0.00129 gcm-3 and CPCV=1.4 .

Choices

Choice (4) Response

a.

-108.54 J

b.

108.54 J

c.

54.27J

d.

-54.27 J

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