# NEET Physics: Questions 1457 - 1461 of 2142

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## Question number: 1457

MCQ▾

### Question

Width of slit is 0.3 mm Fraunhofer diffraction is observed in focus plane of lens of a lens of focal length 1 m. If third minima is at 5 mm distance from central maxima, then wavelength of light is-

### Choices

Choice (4) Response

a.

5000 Å

b.

7000 Å

c.

6500 Å

d.

6000 Å

## Question number: 1458

MCQ▾

### Question

The pressure P, volume V and temperature T of a gas in the jar A and the other gas in the jar B at pressure 3 P, volume and temperature 3T, then the ratio of the number of molecules in the jar A and B will be

### Choices

Choice (4) Response

a.

4: 1

b.

1: 1

c.

1: 2

d.

6: 1

## Question number: 1459

MCQ▾

### Question

Under which of the following conditions is the law PV = RT obeyed most closely by a real gas?

### Choices

Choice (4) Response

a.

High pressure and high temperature

b.

Low pressure and low temperature

c.

High pressure and low temperature

d.

Low pressure and high temperature

## Question number: 1460

» Thermodynamics » Laws of Thermodynamics » First Law of Thermodynamics

MCQ▾

### Question

The specific heat of hydrogen gas at constant pressure is and at constant volume is . If two kilogram hydrogen gas is heated from 10°C to 30°C at constant pressure, the external work done on the gas to maintain it at constant pressure is

### Choices

Choice (4) Response

a.

5 ⨯ 10 3 Cal

b.

4 × 10 3 Cal

c.

4 × 10 5 Cal

d.

4 × 10 4 Cal

## Question number: 1461

MCQ▾

### Question

Helium at 27° has a volume of 27 litres. It is suddenly compressed to a volume of 1 litre. The temperature of the gas will be

### Choices

Choice (4) Response

a.

9327°C

b.

2700°C

c.

1200°C

d.

108°C

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