Kinematics-Average Speed and Instantaneous Velocity (NEET Physics): Questions 73 - 77 of 108

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Question number: 73

» Kinematics » Average Speed and Instantaneous Velocity

MCQ▾

Question

A disc of mass 10 gm is kept horizontally in air by firing bullets of mass 5 g each at the rate of 10/s. If the bullets rebound with same speed. The velocity with which the bullets are fired is –

Choices

Choice (4) Response

a.

147 cm/s

b.

49 cm/s

c.

196 cm/s

d.

98 cm/s

Question number: 74

» Kinematics » Average Speed and Instantaneous Velocity

Assertion-Reason▾

Assertion (Ꭺ)

The relative velocity between any two bodies moving in opposite direction is equal to sum of the velocities of two bodies.

Reason (Ꭱ)

Sometimes relative velocity between two bodies is equal to difference in velocities of the two.

Choices

Choice (4) Response

a.

Ꭺ is false but Ꭱ is true

b.

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

c.

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

d.

Ꭺ is true but Ꭱ is false

Question number: 75

» Kinematics » Average Speed and Instantaneous Velocity

MCQ▾

Question

A man is walking on a level road at a speed of 3 km/h. Raindrops fall vertically with a speed of 4 km/h. Find the velocity of raindrops with respect to the men.

Choices

Choice (4) Response

a.

4 km/hr

b.

7 km/hr

c.

5 km/hr

d.

3 km/hr

Question number: 76

» Kinematics » Average Speed and Instantaneous Velocity

MCQ▾

Question

In the above example, the height ascended or descended, as the case may be, during that time i. e. 4 sec will be -

Choices

Choice (4) Response

a.

1.744 m

b.

0.1744 m

c.

17.44 m

d.

All of the above

Question number: 77

» Kinematics » Average Speed and Instantaneous Velocity

MCQ▾

Question

A 20 g bullet pierces through a plate of mass m1 = 1 kg and then comes to rest inside a second plate of mass n1 = 2.98 kg. It is found that the two plates, initially at rest, now move with equal velocities. The percentage loss in the initial velocity of bullet when it is between m1 and m 2. (Neglect any loss of material of the bodies, due to action of bullet. ) will be -

Choices

Choice (4) Response

a.

25%

b.

30%

c.

45%

d.

20%

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