Question # 1

Ultrasound waves carry energy:

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Less

More

Equal

None of these

Volt is named after the Italian physicist:

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Faraday

Alessandro volta

Newton

Coulomb

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

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336ms^-1

343ms^-1

430ms^-1

470ms^-1

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.

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

To hear echoes, the minimum distance of the obstacle from source of sound should be:

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10m

15m

17m

20m

An object gains excess negative charge after being rubbed against another object, which is:

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Neutral

Negatively charged

Charged

Either, a,b,and c

Safe level of noise depends on factors:

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One

Two

Three

Four

The 1st practical electric battery is known as:

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Voltaic

Pile

Voltaic pile

Voltaic cell

The electrostatic force acting on two charges each of 1 C separated by 1m is about .

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9 x 10⁹ N

9 x 10^-9N

9 x 10⁸N

9 x 10^-8N

The frequency of silent whistle is:

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20,000 Hz – 25000Hz

2000 Hz – 2500Hz

200 KHz – 2000 Hz

25000 KHz

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

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

The speed of sound in are water at 25°C is:

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1530ms-1

1531ms-1

1560ms-1

1570ms-1

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

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

The sound level of rustling of leave is:

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1 dB

20 dB

30 dB

10 dB

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

1 bel=

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0.1 dB

10 dB

100 dB

0.01 dB

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