# NEET Physics: Questions 1535 - 1540 of 2142

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## Question number: 1535

MCQ▾

### Question

Half-life of Bi 210 is 5 days. If we start with 50, 000 atoms of this isotope, the number of atoms left over after 10 days is

### Choices

Choice (4) Response

a.

5, 000

b.

25, 000

c.

20, 000

d.

12, 500

## Question number: 1536

MCQ▾

### Question

The temperature of sink of Carnot engine is 27°C and Efficiency of engine is 25%. Then temperature of source

### Choices

Choice (4) Response

a.

127°C

b.

327°C

c.

27ºC

d.

227ºC

## Question number: 1537

MCQ▾

### Question

Sun radiate energy in all direction. The average energy received at earth is 1.4 KW/m 2. The average distance between the earth and the sun is 1.5 ⨯ 10 n m. If this energy is released by conservation of mass into energy, then the mass lost per day by the sun is approximately (Use l day = 86400 sec)

### Choices

Choice (4) Response

a.

3.8 ⨯ 10 14 kg.

b.

7.6 ⨯ 10 14 kg

c.

3.8 ⨯ 10 12 kg

d.

4.4 ⨯ 10 9 kg

## Question number: 1538

MCQ▾

### Question

If 92 U 238 undergoes successively 8 α -decays and 6 β -decays, then resulting nucleus is,

### Choices

Choice (4) Response

a.

82 U 206

b.

82 U 214

c.

82 U 210

d.

82 Pb 206

## Question number: 1539

MCQ▾

### Question

How much work to be done in decreasing the volume of and ideal gas by an amount of 1.4 × 10 -4 m 3 at normal temperature and constant normal pressure of 1 × 10 -5N/ m 2

### Choices

Choice (4) Response

a.

14 Joule

b.

28 Joule

c.

25 Joule

d.

27 Joule

## Question number: 1540

MCQ▾

### Question

A monoatomic ideal gas, initially at temperature T 1 is enclosed in a cylinder fitted with a frictionless piston. The gas is allowed to expand adiabatically to a temperature T 2 by releasing the piston suddenly. If I 1 and I 2 are the lengths of the gas column before and after expansion respectively, then is given by

### Choices

Choice (4) Response

a.

b.

c.

d.

f Page