Question # 1

Safe level of noise depends on factors:

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One

Two

Three

Four

Capacitance is defined as:

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VC

Q/V

QV

V/Q

Electric potential is a quantity:

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Scalar

Vector

Base

All

Frequency of tuning fork depends upon its …………. of prongs:

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Weight

Speed

Mass

Distance

SI unit of electric intensity is:

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NC

NC^-1

NC^-2

NC^-3

If a charged body is brought near a negatively charged electroscope and the leaves of electroscope diverge, then the body is:

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Positively charged

Negatively charged

Neutral

None of these

How many tubes or electron guns used in a colour television set:

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Two

Four

Five

Three

Sound waves having frequency higher than 20,000 Hz are called:

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Ultrasonic

Infrasonic

Audible

Echo

A positive and negative charges are initially 4 cm apart. When they are moved closer together so that they are now only 1 cm apart, the force between them is:

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4 times smaller than before

4 times larger than before

8 times larger than before

16 times larger than before.

Intensity level of the sound produced by mosquito buzzing is:

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70 dB

40 dB

10 dB

120 dB

Ultrasound waves carry energy:

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Less

More

Equal

None of these

The speed of sound in air at 0°C is:

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331ms^-1

376ms^-1

231ms^-1

386ms^-1

The coulomb's law is valid for the charges which are:

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moving and point charges

moving and non-point charges

stationary and pont charges

stationary and large size charges

The brain of any computer system is:

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Monitor

Memory

CPU

Control unit

The frequency of silent whistle is:

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20,000 Hz – 25000Hz

2000 Hz – 2500Hz

200 KHz – 2000 Hz

25000 KHz

NOT gate is also called:

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Converter

Inverter

Transmitter

Receiver

1 volt is equal to:

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JC

JC^-1

JC^-2

JC^-3

One coulomb is equal to charge of ________ electrons.

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6.25 x 10^-19

6.25 x 10¹⁹

6.25 x 10¹⁸

6.25 x 10^-18

Mathematical formula of capacitance of a capacitor is:

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C = QV

C = Q/V

C = V/Q

C = V2/Q

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

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4-times

1/4th

Double

Half

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