Question # 1

Safe level of noise depends on factors:

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One

Two

Three

Four

Electric field lines of force were first introduced by:

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Ampere

Farady

Fleming

Coulomb

The SI the unit of charge is:

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Jpi;e

Volt

Coulomb

Watt

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

In the presence of a charged body, an insulated conductor develops positive charge at one end and negative charge at the other end, this i- called:

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Electrostatics

Electrostatic induction

Magnetism

Electromagnetic induction

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

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Two

Four

Five

Three

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

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Weight

Speed

Mass

Distance

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

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

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336ms^-1

343ms^-1

430ms^-1

470ms^-1

Which device is used to store charge:

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Resister

Capacitor

Dielectric

Fuse

Sound waves having frequency lower than 20 Hz are called:

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Ultrasonic

Infrasonic

Audible

Echo

Electric field lines:

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always cross each other

never cross each other

cross each other inthe region of strong field

cross each other in the region of weak field

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

Coulomb's law is mathematically stated as:

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F = k q1 q2/r3

F = k q2 q2 / r2

F = k q1 q2 / r

F = k q1 q2 / r2

When frequency of sound wave is increased, which of the following decreases:WavelengthPeriodAmplitude

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(i) Only

(iii) Only

(i) And (ii) only

(i) And (iii) only

When you rub a plastic rod against your hair several times and put it near some bits of paper, the pieces of papers are attracted towards it. What does this observation indicate?

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the rod and the paper are oppositely charged

the rod acquires a positive charge

the reod and the paper have the same charges

the rod acquires a negative charge

The intensity of lawn mover is:

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10-1 wm^-2

10-2 wm^-2

10-3 wm^-2

10-4 wm^-2

The 1st practical electric battery is known as:

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Voltaic

Pile

Voltaic pile

Voltaic cell

The basic operations performed by a computer are:

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Arithmetic operations

Non-arithmetic operations

Logical operations

Both a and c

Unlike charges always:

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Repel each other

Attract each other

Sometimes repel and attract each other

Both A and B

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