KVPY Stream-SA (Class 11) Physics: Questions 11 - 14 of 242

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Question number: 11

» Atoms and Nuclei » Radioactive Decay Law

Appeared in Year: 2009

MCQ▾

Question

U92235 atom disintegrates to Pb82207 with a half-life of 10 9 years. In the process it emits & alpha particles and n β - particles. Here n is

Choices

Choice (4) Response
a.

3

b.

7

c.

4

d.

14

Question number: 12

» Current Electricity » Electrical Energy and Power

Appeared in Year: 2010

MCQ▾

Question

An electric heater consists of a micro coil and runs under 220 V, consuming 1 kW power. Part of its coil burned out and it was reconnected after cutting off the burn portion. The power it will consume now is:

Choices

Choice (4) Response
a.

1 kW

b.

more than 1 kW

c.

less than 1 kW, but not zero

d.

0 kW

Question number: 13

» Gravitation » Gravitational Acceleration

MCQ▾

Question

Consider two spherical planets of same average density moving around the earth in same circular orbits at same height R. Planet 2 is 8 times as massive as planet 1. The ratio of the acceleration due to gravity of the second planet to that of first is (2009)

Choices

Choice (4) Response
a.

8

b.

2

c.

1

d.

4

Question number: 14

» Ray Optics » Reflection and Refraction of Light » Spherical Surface

Appeared in Year: 2011

MCQ▾

Question

A student sees the top edge and the bottom center C of a pool simultaneously from an angle θ above the horizontal as shown in the figure. The refraction index of water which fills up to the top edge of the pool is 43 . If hx=74 then cos θ is,

Pool of depth h and length x

Pool of Depth H and Length X

In figure a pool of depth h and length x is shown. A student sees the top edge and bottom center C of the pool simultaneously from an angle theta above the horizontal.

Choices

Choice (4) Response
a.

8345

b.

821

c.

27

d.

8353

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