Kinematics (NEET (National Eligibility cum Medical Entrance Test) Physics): Questions 169 - 172 of 233

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Question number: 169

» Kinematics » Uniformly Accelerated Motion

MCQ▾

Question

The total mass of an elevator with a 80 kg man in it is 1000 kg. This elevator moving upward with a speed of 8 m/sec, is brought to rest over a distance of 16m. The tension T in the cables supporting the elevator and the force exerted on the man by the elevator floor will respectively be

Choices

Choice (4) Response

a.

78 N, 624 N

b.

624 N, 78 N

c.

624 N, 7800 N

d.

7800 N, 624 N

Question number: 170

» 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: 171

» 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: 172

» Kinematics » Uniform and Non-Uniform Motion

MCQ▾

Question

A force of (Equation ) N acted on a body of mass 10 kg. The displacement after 10 sec, if it starts from rest, will be -

Choices

Choice (4) Response

a.

10 m along Equation with x axis

b.

50 m along Equation with x axis

c.

70 m along Equation with x axis

d.

None of the above

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