# NEET Physics: Questions 20 - 24 of 2142

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## Question number: 20

MCQ▾

### Question

The random error in the arithmetic mean of 100 observations is x; then random error in the arithmetic mean of 400 observations would be

### Choices

Choice (4) Response

a.

4x

b.

2 x

c.

0.25 x

d.

0.5x

## Question number: 21

MCQ▾

### Question

A particle moves along x-axis as x = 4 (t - 2) + a (t - 2) 2

### Choices

Choice (4) Response

a.

The acceleration of particle is 2a

b.

The initial velocity of particle is 4

c.

The particle is at origin at t = 0

d.

Question does not provide sufficient data or is vague

## Question number: 22

MCQ▾

### Question

The length of a cylinder is measured with a meter rod having least count 0.1 cm. Its diameter is measured with Vernier calipers having least count 0.01 cm. Given that length is 5.0 cm. and radius is 2.0 cm. The percentage error in the calculated value of the volume will be

### Choices

Choice (4) Response

a.

4%

b.

1 %

c.

2%

d.

3%

## Question number: 23

MCQ▾

### Question

According to Joule’s law of heating, heat produced H = I 2 Rt, where I is current, R is resistance and t is time. If the errors in the measurements of I, R, and t. are 3%, 4 % and 6 % respectively then error in the measurement of H is

### Choices

Choice (4) Response

a.

17 %

b.

25%

c.

16%

d.

19%

## Question number: 24

MCQ▾

### Question

Error in the measurement of radius of a cylinder is 4%. The error in the calculated value of its volume is

### Choices

Choice (4) Response

a.

8%

b.

5%

c.

3%

d.

7%

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