# KVPY (Kishore Vaigyanik Protsahan Yojana) Stream SB-SX (Class 12 & 1st Year B.Sc.) Physics: Questions 194 - 197 of 268

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## Question number: 194

MCQ▾

### Question

The magnetic field produced at the centre of a coil of radius R carrying a current is . The magnitude of magnetic field at a point lying on the axis of the coil at a distance from the centre of the coil is –

### Choices

Choice (4) Response

a.

b.

c.

d.

## Question number: 195

MCQ▾

### Question

A homogeneous sphere of mass M and radius R has moment of inertia I about its diameter. A concentric sphere of radius is carved out from the sphere. What is the moment of inertia of the remaining part about the diameter?

### Choices

Choice (4) Response

a.

b.

c.

d.

## Question number: 196

Appeared in Year: 2014

MCQ▾

### Question

Consider the system shown below.

A horizontal force F is applied to a block X of mass 8 kg such that the block Y of mass 2 kg adjacent to it does not slip downwards under gravity. There is no friction between the horizontal plane and the base of the block X. The coefficient of friction between the surfaces of blocks X and Y is 0.5. Take acceleration due to gravity to be 10 ms–2. The minimum value of F is,

### Choices

Choice (4) Response

a.

240N

b.

40N

c.

200N

d.

160N

## Question number: 197

MCQ▾

### Question

If the escape velocity from the earth is about, then the escape velocity from a planet having twice the radius and the same mean density as the earth is –

### Choices

Choice (4) Response

a.

b.

c.

d.

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