NEET (NTA)-National Eligibility cum Entrance Test (Medical) Physics: Questions 1971 - 1975 of 2184

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Question number: 1971

» Rotational Motion » Moment of Inertia

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MCQ▾

Question

Three rods each of length L and mass M are placed along X, Y and Z axis in such a way that one end of each of the rod is at the origin. The moment of inertia of this system about Z axis is,

Choices

Choice (4) Response

a.

b.

c.

d.

Question number: 1972

» Gravitation » Energy

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MCQ▾

Question

With what velocity must a body be thrown upward form the surface of the earth so that it reaches a height of 7 Re? Earth’s mass M = 6 ⨯ 10 24 kg, radius R e = 6.4 ⨯ 10 6 m and G = 6.67 ⨯ 10 -11 N-m 2 /kg 2.

Choices

Choice (4) Response

a.

b.

c.

d.

Question number: 1973

» Rotational Motion » Moment of Inertia

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MCQ▾

Question

From a uniform wire, two circular loops are made (i) P of radius r and (ii) Q of radius nr. If the moment of inertia of loop Q about an axis passing through its center and perpendicular to its plane is 27 times that of P about a similar axis, the value of n is (diameter of the wire is very much smaller than r or nr)

Choices

Choice (4) Response

a.

3

b.

2

c.

6

d.

4

Question number: 1974

» Gravitation » Gravitational Acceleration

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MCQ▾

Question

What will be the acceleration due to gravity on the surface of the moon if its radius is th the radius of the earth and its mass is th the mass of the earth

Choices

Choice (4) Response

a.

b.

c.

d.

Question number: 1975

» Gravitation » Gravitational Acceleration

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Assertion-Reason▾

Question

Assertion (Ꭺ)

There is no effect of rotation of earth on the value of acceleration due to gravity at poles.

Reason (Ꭱ)

Rotation of earth is about polar axis.

Choices

Choice (4) Response

a.

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

b.

Ꭺ is false but Ꭱ is true

c.

Ꭺ is true but Ꭱ is false

d.

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