Question # 1

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

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Ear piece

Microphone

Transmission channel

Receiver

At mean position kinetic energy of the ball is:

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Minimum

Zero

Maximum

10 J

Which is not a hardware device?

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CPU

Windows

Keyboard

Mouse

Optical fibre are:

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Cheap

Flexible

Lighter

All of these

Power of convex lens is 10 D. Its focal length is:

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100 m

10 m

1 m

0.1 m

CD which is made of soft material is called:

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Hard disk

Floppy disk

Iron disk

Copper disk

The particles emitted from a hot cathode surface are:

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Positive ions

Negative ions

Proton

Electron

In mathematical form of Ohm's law, "R" is:

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Resistance

Specific resistance

Resistor

Resistivity

The S.I unit of potential difference is:

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Ampere

Coulomb

Volt

Watt

The ray of the light after reflection from concave mirror passes through:

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Centre

Principal focus

Pole

None of these

A transformer has Np =100 and Ns =500 , if 6 volt D.C is applied across its primary, the induced voltage.

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0 V

30 V

45 V

60 V

Wave transfer

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Energy

Frequency

Wavelength

Velocity

The refractive index of internal coating of optical fibre is:

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1.56

1.51

1.53

1.58

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