Kinematics-Average Speed and Instantaneous Velocity (NEET Physics): Questions 64 - 67 of 108

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Question number: 64

» Kinematics » Average Speed and Instantaneous Velocity

MCQ▾

Question

A disc of mass 5 gm is kept horizontally in air by firing bullets of mass 10 g each at the rate of 20/s. If the bullets rebound with same speed. The velocity with which the bullets are fired is –

Choices

Choice (4) Response

a.

9.28 cm/s

b.

1.25 cm/s

c.

1.96 cm/s

d.

4.89 cm/s

Question number: 65

» Kinematics » Average Speed and Instantaneous Velocity

MCQ▾

Question

A swimmer who can swim in a river with speed mv (with respect to still water) where v is the velocity of river current, jumps into the river from one bank to cross the river. Then

Select the correct answers and mark it according to the following codes:

(1) If m < 1 he cannot cross the river

(2) If m < 1 he cannot reach a point on other bank directly opposite to his starting point.

(3) If m > 1 he can reach a point on other bank

(4) He can reach the other bank at some point, whatever be the value of m.

Choices

Choice (4) Response

a.

1 and 2 are correct

b.

1, 2 and 3 are correct

c.

2 and 4 are correct

d.

1 and 3 are correct

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

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