NEET (NTA)-National Eligibility cum Entrance Test (Medical) Physics: Questions 435 - 439 of 2184

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Question number: 435

» Rotational Motion » Angular Momentum

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MCQ▾

Question

A round disc of moment of inertia I 2 about its axis perpendicular to its plane and passing through its center is placed over another disc of moment of inertia I1 rotating with an angular velocity co about the same axis. The final angular velocity of the combination of discs is

Choices

Choice (4) Response

a.

b.

c.

d.

Question number: 436

» Laws of Motion » Force and Inertia

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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: 437

» Kinematics » Average Speed and Instantaneous Velocity

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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.

98 cm/s

b.

147 cm/s

c.

196 cm/s

d.

49 cm/s

Question number: 438

» Rotational Motion » Angular Momentum

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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.

40 rad/sec 2

b.

30 rad/sec 2

c.

1880 degree/sec 2

d.

1980 degree/sec 2

Question number: 439

» Kinematics » Average Speed and Instantaneous Velocity

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Assertion-Reason▾

Question

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.

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

b.

Ꭺ is false but Ꭱ is true

c.

Both Ꭺ and Ꭱ are false

d.

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