Question # 1

The speed of sound was accurately measured in:

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1736

1737

1738

1739

Old people cannot hear sound above than:

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1000 Hz

15000 Hz

20000 Hz

1 Pico Farad is equal to:

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10^-9F

10^-12F

10¹²F

10^-6F

Which frequency is used by elephants to communicate with each other:

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Zero frequency

Low frequency

Medium frequency

High frequency

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

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Ultrasonic

Infrasonic

Audible

Echo

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

According to Coulomb's law , what happens to the attraction of two oppositely charged objects as their distance of separation increases?

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Increase

Decreased

remain unchanged

can not be determined

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 SI unit of electric field intensity is:

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NC-2

NC-1

Ns

Nm-1

Field around a charge in which that charge exerts a force on a point charge brought in that field is called:

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Electric field

Magnetic field

Neutral zone

Point charge

A positive electric charge:

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Attracts other positive charge

Repels other positive charge

Attracts a neutral particle

Repels a neutral particle

The sound level of rustling of leave is:

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1 dB

20 dB

30 dB

10 dB

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