Question # 1

The mirror whose outer surface is reflecting is called:

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Concave mirror

Convex mirror

Lens

Mirror

Hard disk is made of:

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Aluminium

Copper

Iron

Plastic

The value of acceleration in simple harmonic motion at mean position is

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Maximum

Zero

10 N

Both a , b

An object is 14 cm is front of a convex mirror. The image is 5.8 cm behind the mirror. What is the focal length of the mirror?

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4.1 cm

8.2 cm

9.9 cm

20 cm

Which of the following characteristics of a wave is independent of the others:

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speed

frequency

amplitude

wavelength

Safe level of noise depends on factors:

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One

Two

Three

Four

Two uncharged objects a and b are rubbed against each other. When object b is placed near a negatively charged object c, the two objects repel each other. Which of these statements is true about object a:

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Remains uncharged

Becomes positively charged

Becomes negatively charged

Unpredictable

Sun light consist of ____________ colour

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6

7

5

2

Shock absorbers in automobiles are one practical application of:

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SHM

Random motion

Damped motion

None of these

Half of radius of curvature is called:

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Focal length

Principal focus

Axis

None of these

When you rub a plastic rod against your hair several times and put it near some bits of paper, the pieces of papers are attracted towards it. What does this observation indicate?

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the rod and the paper are oppositely charged

the rod acquires a positive charge

the reod and the paper have the same charges

the rod acquires a negative charge

Speed of light in air is ms^-1

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3 x 10⁸

3 x 10¹¹

3 x 10⁵

340

Power of electric heater is:

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1500W

4750W

100W

50W

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