NEET (NTA)-National Eligibility cum Entrance Test (Medical) Physics: Questions 244 - 247 of 2184

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Question number: 244

» Rotational Motion » Torque

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MCQ▾

Question

A child is standing with folded hands at the center of a platform rotating about its central axis. The kinetic energy of the system is K. The child now stretches his arms so that the moment of inertia of the system doubles. The kinetic energy of the system now is

(1) Less than 2K

(2) Equal to K/2

(3) More than K/4

(4) Equal to 4K

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

Choices

Choice (4) Response

a.

1 and 3 are correct

b.

1 and 2 are correct

c.

2 and 4 are correct

d.

1,2 and 3 are correct

Question number: 245

» Properties of Solids & Liquids » Young's Modulus

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Question

If x, y, p and q represent the increase in length, the original length of the experimental wire, load applied to the wire and area of cross-section of the wire respectively then Young’s modulus of the wire is given by

Choices

Choice (4) Response

a.

b.

c.

d.

Question number: 246

» Kinematics » Uniform and Non-Uniform Motion

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MCQ▾

Question

A body whose mass 6 kg is acted upon by two forces (8i + 10j) N and (4i + 8j) N. The acceleration produced will be (in m/s 2) -

Choices

Choice (4) Response

a.

(3i + 2j)

b.

2i + 3j

c.

12i + 18j

d.

1/3 (G + 3)

Question number: 247

» Rotational Motion » Torque

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MCQ▾

Question

A constant torque acting on a uniform circular wheel changes its angular momentum from Aq to 4Aq in 4 seconds. The magnitude of this torque is

Choices

Choice (4) Response

a.

b.

c.

d.