# NEET (NTA)-National Eligibility cum Entrance Test (Medical) Physics: Questions 17 - 21 of 2320

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## Question number: 17

Edit
Assertion-Reason▾

### Assertion (Ꭺ)

The velocity of a body A relative to the body B is the sum of the velocities of bodies A and B if both travel in opposite direction on a straight line.

### Reason (Ꭱ)

The velocity of a body A relative to the body B is the difference of the velocities of bodies A and B if both travel in opposite direction on a straight line.

### Choices

Choice (4)Response

a.

Ꭺ is false but Ꭱ is true

b.

Ꭺ is true but Ꭱ is false

c.

Both Ꭺ and Ꭱ are true and Ꭱ is the correct explanation of Ꭺ

d.

Both Ꭺ and Ꭱ are true but Ꭱ is NOT the correct explanation of Ꭺ

## Question number: 18

Edit
MCQ▾

### Question

A train of 150 meter length is going towards north direction at a speed of 10 m/s. A parrot flies at the speed of 5 m/s towards south direction parallel to the railway track. The time taken by the parrot to cross the train is

### Choices

Choice (4)Response

a.

15 sec

b.

8 sec

c.

12 sec

d.

10 sec

## Question number: 19

Edit
MCQ▾

### Question

Which of the following pairs is wrong?

### Choices

Choice (4)Response

a.

Relative density-hydrometer

b.

Earthquake-Seismograph

c.

Temperature-spectrometer

d.

Pressure-Barometer

## Question number: 20

Edit
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.

2 x

b.

0.25 x

c.

0.5x

d.

4x

## Question number: 21

Edit
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.

All of the above

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