KVPY Stream SB-SX (Class 12 & 1st Year BSC) Physics: Questions 227 - 230 of 250

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Question number: 227

» Electromagnetic Induction & Alternating Currents » Electromagnetic Induction

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

» Laws of Motion » Law of Conservation of Linear Momentum

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

» Dual Nature of Matter and Radiation » Black-Body Radiation

MCQ▾

Question

A black body radiates heat energy at the rate of 1×105Js1m2 at 1150C. The temperature of the black body, at which the rate of heat radiation is 81×105Js1 , will be –

Choices

Choice (4) Response
a.

2730 C

b.

5270 C

c.

8910 C

d.

9270 C

Question number: 230

» Center of Mass » Centre of Mass of a Rigid Body

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,

Two uniform plates of different metals joined

Two Uniform Plates of Different Metals Joined

In figure 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. Also the centre of mass of the composite body is located at the midpoint of their common side.

Choices

Choice (4) Response
a.

2: 1

b.

4: 3

c.

1: 1

d.

3: 4

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