Question # 1

The speed of sound in air at 21 °C is:

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336ms^-1

343ms^-1

430ms^-1

470ms^-1

Which instrument is used to measure current, resistance and potential difference:

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Galvanometer

Digital meter

Voltmeter

Ammeter

In simple pendulum motion, restoring force is provided by:

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Air resistance

Tension in the string

Inertia

Weight of the body

A positive electric charge:

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Attracts other positive charge

Repels other positive charge

Attracts a neutral charge

Repels a neutral chage

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

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speed

frequency

amplitude

wavelength

A 3Ω resistor having 2A current will dissipate the power of:

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12W

4W

6W

8W

The time period of frequency and time period is equal to:

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v

1

0

λ

1 Pico farad is equal to:

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10^-9F

10¹²F

10^-12F

10^-6F

A device which has two ways of communication is:

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television

radio

hard disk

mobile phone

The minimum value of angle of deviation is called:

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Minimum angle

Incident angle

Angle of minimum deviation

None of these

The force on a current carrying conductor is maximum if angle between field and conductor is:

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0^o

90^o

180^o

45^o

The speed of sound in air is kmh^-1

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1243

1244

1245

1246

Radio waves are:

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Longitudinal waves

Transverse waves

Electromagnetic waves

All of these

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