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

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## Question number: 205

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

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

### Choices

Choice (4) Response

a.

0 J

b.

20 J

c.

10 J

d.

30 J

## Question number: 207

MCQ▾

### Question

A rifle bullet loses 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

MCQ▾

### Question

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

### Choices

Choice (4) Response

a.

-108.54 J

b.

108.54 J

c.

54.27J

d.

-54.27 J

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