# NEET (NTA)-National Eligibility cum Entrance Test (Medical) Physics: Questions 1478 - 1482 of 2320

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## Question number: 1478

» Thermodynamics » Laws of Thermodynamics » First Law of Thermodynamics

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MCQ▾

### Question

The specific heat of hydrogen gas at constant pressure is and at constant volume is . If one kilogram hydrogen gas is heated from 10°C to 20°C at constant pressure, the external work done on the gas to maintain it at constant pressure is

### Choices

Choice (4)Response

a.

10 3 Cal

b.

10 4 Cal

c.

10 5 Cal

d.

5 ⨯ 10 3 Cal

## Question number: 1479

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MCQ▾

### Question

A scientist says that the efficiency of his heat engine which operates at source temperature 120°C and sink temperature 27°C is 26%, then

### Choices

Choice (4)Response

a.

Data are incomplete

b.

It is possible but less probable

c.

It is impossible

d.

It is quite probable

## Question number: 1480

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MCQ▾

### Question

The value of the gas constant (R) calculated from the perfect gas equation is 8.32 Joule/gm mole K, whereas in value calculated from the knowledge of C P and C V of the gas is 1.98 Cal/gm mole K. From this data, the value of J is

### Choices

Choice (4)Response

a.

b.

c.

d.

## Question number: 1481

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MCQ▾

### Question

At which of the following temperature would the molecule of a gas have twice the average kinetic energy they have 20°C?

### Choices

Choice (4)Response

a.

586° C

b.

80° C

c.

313°C

d.

40° C

## Question number: 1482

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MCQ▾

### Question

A homogeneous solid cylinder of length L and cross-sectional area is immersed such that it floats with its axis vertical at the liquid-liquid interface with length in the denser liquid as shown in the fig. The lower density liquid is open to atmosphere having pressure P Q. Then density of solid is given by

### Choices

Choice (4)Response

a.

b.

c.

d.

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