# NEET (NTA)-National Eligibility cum Entrance Test (Medical) Physics: Questions 2140 - 2144 of 2320

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## Question number: 2140

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Appeared in Year: 2017

MCQ▾

### Question

Which of the following statements are correct?

1. Center of mass of a body always coincides with the centre of gravity of the body.
2. Center of mass of a body is the point at which the total gravitational torque on the body is zero
3. A couple on a body produce both translational and rotational motion in a body.
4. Mechanical advantage greater that one means that small effort can be used to lift a large load.

### Choices

Choice (4)Response

a.

2 and 3

b.

2 and 4

c.

3 and 4

d.

1 and 2

## Question number: 2141

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Appeared in Year: 2017

MCQ▾

### Question

Two discs of same moment of inertia rotating about their regular axis passing through centre and perpendicular to the plane of disc with angular velocities . They are brought into contact face to face coinciding the axis of rotation. The expression for loss of energy during this process is –

### Choices

Choice (4)Response

a.

b.

c.

d.

## Question number: 2142

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Appeared in Year: 2017

MCQ▾

### Question

A gas mixture consists of of and of at temperature . Neglecting all vibrational modes, the total internal energy of the system is:

### Choices

Choice (4)Response

a.

b.

c.

d.

## Question number: 2143

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Appeared in Year: 2017

MCQ▾

### Question

The resistance of a wire is ohm. If it is melted and stretched to times its original length, its new resistance will be –

### Choices

Choice (4)Response

a.

b.

c.

d.

## Question number: 2144

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MCQ▾

### Question

The least count of a spherometer is given by

### Choices

Choice (4)Response

a.

b.

c.

d.

Both b. and c. are correct

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