Kinematics (NEET Physics): Questions 179 - 182 of 229

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Question number: 179

» Kinematics » Uniform and Non-Uniform Motion

MCQ▾

Question

A fire man has to carry an injured person of mass 30 kg from the top of a building with the help of the rope which can withstand a load of 150 kg. The acceleration of the

Fireman if his mass is 50 kg, will be

Choices

Choice (4) Response

a.

17.97 m/s 2

b.

9.8 m/s 2

c.

8.575 m/s 2

d.

2.63 m/s 2

Question number: 180

» Kinematics » Average Speed and Instantaneous Velocity

Assertion-Reason▾

Assertion (Ꭺ)

A river is flowing from east to west at a speed of 5m/min. A man on south bank of river, capable of swimming 10 m/min in still water, wants to swim across the river in shortest time. He should swim due north.

Reason (Ꭱ)

For the shortest time the man needs to swim perpendicular to the bank.

Choices

Choice (4) Response

a.

Ꭺ is true but Ꭱ is false

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.

Both Ꭺ and Ꭱ are false

Question number: 181

» 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: 182

» 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

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