Question # 1

Diffraction of wave can be observed clearly only when the size of slit or obstacle is nearly__________ to the wavelength of the wave:

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Two times

Equal

Four times

None of these

The half life of Lead Pb is

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10 hour

10.10 hours

10.6 hours

1 year

The device which is used to convert sound waves into electrical signal is called:

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Ear piece

Microphone

Transmission channel

Receiver

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

Unpredicatable

If we double the distance between two charges, then force becomes:

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4-times

¼ th

Double

Half

Speed of light in air is ms^-1

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3 x 10⁸

3 x 10¹¹

3 x 10⁵

340

waves whose speed is equal to speed of light are:

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X-rays

sound rays

electromagnetic waves

shock waves

The presence of a magnetic field can be detected by a

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small mass

Stationary positive charge

Stationary negative charge

Magnetic compass

Which type of image is formed by a convex lens on a screen:

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Inverted and real

Inverted and virtual

Upright and real

Upright and virtual

The current which changes its direction is called:

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Current

A.C.

Conventional current

D.C.

In simple pendulum motion, restoring force is provided by:

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Air resistance

Tension in the string

Inertia

Weight of the body

Which form of energy is sound?

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Electrical

Mechanical

Thermal

Chemical

Bouncing back of light after striking the surface is called:

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Refraction

Reflection

Diffraction

Interference

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