# KVPY (Kishore Vaigyanik Protsahan Yojana) Stream SB-SX (Class 12 & 1st Year B.Sc.) Physics: Questions 227 - 230 of 268

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## Question number: 227

MCQ▾

### Question

A long vertical wire carrying current i produces a neutral point with the earth’s magnetic field at 7 cm from the wire. If the horizontal component of the earth’s magnetic field is 0.18 gauss, the current in the wire is –

### Choices

Choice (4) Response

a.

12.6 A

b.

63 A

c.

6.3 A

d.

0.63 A

## Question number: 228

Appeared in Year: 2015

MCQ▾

### Question

An object is dropped from height of 16 m. It gets embedded in 1.5 m of sand and stops.

### Choices

Choice (4) Response

a.

Only kinetic energy is conserved

b.

Neither K. E. nor momentum are conserved

c.

K. E and momentum are conserved

d.

Only momentum is conserved

## Question number: 229

MCQ▾

### Question

A black body radiates heat energy at the rate of at 1150C. The temperature of the black body, at which the rate of heat radiation is , will be –

### Choices

Choice (4) Response

a.

2730 C

b.

5270 C

c.

8910 C

d.

9270 C

## Question number: 230

Appeared in Year: 2015

MCQ▾

### Question

Two uniform plates of the same thickness and area but of different materials, one shaped like an isosceles triangle and the other shaped like a rectangle are joined together to form a composite body as shown in the figure. If the centre of mass of the composite body is located at the midpoint of their common side, the ratio between masses of the triangle to that of the rectangle is,

### Choices

Choice (4) Response

a.

2: 1

b.

4: 3

c.

1: 1

d.

3: 4

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