Kinematics-Average Speed and Instantaneous Velocity (NEET Physics): Questions 66 - 70 of 108

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Question number: 66

» Kinematics » Average Speed and Instantaneous Velocity

Assertion-Reason▾

Assertion (Ꭺ)

Rain is falling vertically downwards with velocity 6 km/h. A man walks with a velocity of 8 km/h. Relative velocity of rain w. r. t. the man is 10 km/h.

Reason (Ꭱ)

Relative velocity is the ratio of two|velocities.

Choices

Choice (4) Response

a.

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

b.

Both Ꭺ and Ꭱ are false

c.

Ꭺ is true but Ꭱ is false

d.

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

Question number: 67

» Kinematics » Average Speed and Instantaneous Velocity

MCQ▾

Question

A body of mass 0.05 kg falls from a height of 5 meter into a pile of sand. The body penetrates the sand a distance of 5 cm before stopping. What force has the sand exerted on the body?

Choices

Choice (4) Response

a.

-49 N

b.

- 19.6 N

c.

-196 N

d.

0.196 N

Question number: 68

» Kinematics » Average Speed and Instantaneous Velocity

MCQ▾

Question

A car of 1000 kg moving with a velocity of 18 km/hr is stopped by the brake force of 1000 N. The distance covered by it before coming to rest is –

Choices

Choice (4) Response

a.

12.5 m

b.

144 m

c.

1 m

d.

162 m

Question number: 69

» Kinematics » Average Speed and Instantaneous Velocity

MCQ▾

Question

A body of mass 20 kg moving with a velocity of 3 m/s, rebounds on a wall with same velocity. The impulse on the body is -

Choices

Choice (4) Response

a.

60 Ns

b.

120 Ns

c.

30 Ns

d.

180 Ns

Question number: 70

» Kinematics » Average Speed and Instantaneous Velocity

MCQ▾

Question

A ship is steaming towards east at a speed of 12 ms -1. A woman runs across the deck at a speed of 5 ms -1 in the direction at right angles to the direction of motion of the ship i. e. towards north. What is the velocity of the woman relative to sea?

Choices

Choice (4) Response

a.

12 m/s

b.

5 m/s

c.

13 m/s

d.

17 m/s

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