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

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Question number: 17

» Kinematics » Average Speed and Instantaneous Velocity

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Assertion-Reason▾

Question

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

» Kinematics » Average Speed and Instantaneous Velocity

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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

» Physics and Measurement » Technology and Society

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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

» Physics and Measurement » Errors in Measurement

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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

» Kinematics » Motion in a Straight Line

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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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