NEET Physics: Questions 435 - 438 of 2098

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Question number: 435

» Laws of Motion » Force and Inertia

MCQ▾

Question

A 4 kg balls is swing in a vertical circle at the end of a cord 1 m long. The maximum speed at which it can swing if the cord can sustain maximum tension of 163.6 N will be –

Choices

Choice (4) Response

a.

36 m/s

b.

8 m/s

c.

6 m/s

d.

64 m/s

Question number: 436

» 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: 437

» Rotational Motion » Angular Momentum

MCQ▾

Question

The wheel of a car is rotating at the rate of 1200 revolutions per minute. On pressing the accelerator for 10 seconds, it starts rotating at 4500 revolutions per minute. The angular acceleration of the wheel is

Choices

Choice (4) Response

a.

1980 degree/sec 2

b.

40 rad/sec 2

c.

30 rad/sec 2

d.

1880 degree/sec 2

Question number: 438

» 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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