Question # 1

Which of the following devices can be used to produce both a transverse and longitudinal waves?

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A string

A ripple tank

A helical spring

A tuning fork

Spherical mirrors are used in:

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Medical

Search light

Microscope

All of these

Pitch of sound depends upon:

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Frequency

Amplitude

Intensity

Time period

Which component is output device of computer?

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CPU

C.D

Keyboard

Monitor

Sound waves are an example of:

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Transverse waves

Electromagnetic waves

Longitudinal waves

All of these

Which device has two coils, primary and secondary?

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D.C. Motor

Transformer

A.C. genrator

a and b

Level of noise recommended in eight, hour work day:

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80-90 dB

80-85- dB

85-90 dB

90-95 dB

The data stored in C.D. is.

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680 MB

650 MB

700 MB

750 MB

The parts of computer which can be seen and touched are called:

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Hardware

Software

Modem

CPU

The value or current I passing through a conductor is inversely proportional to:

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Temperature

Potential difference

e.m.f.

resistance

The sensation of sound persists in our brain for:

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0.1 sec

0.01 sec

1 sec

10 sec

In series combination of capacitors, each capacitor will have same:

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Voltage

Charge

Capacitance

Charge and voltage

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

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Centre

Principal focus

Pole

Radius

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