Question # 1

If we double the distance between two charges, what will be the change in the force between them?

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Half

Double

One fourth

Four times

Ultrasound waves carry energy:

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Less

More

Equal

None of these

Old people cannot hear sound above than:

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1000 Hz

15000 Hz

20000 Hz

Electric field lines of force were first introduced by:

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Ampere

Farady

Fleming

Coulomb

Electric potential is a quantity:

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Scalar

Vector

Base

All

The speed of sound was accurately measured in:

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1736

1737

1738

1739

Big unit of capacitance is:

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Farad

Volt

watt

coulomb

Two charged spheres are separated by 2 mm. Which of the following would produced the greatest attractive force?

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+1 q and +4q

-1 q and -4q

+2 q and +2q

+2 q and -2q

The S.I unit of electric potential is:

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Watt

Joule

Coulomb

Volt

One micro coulomb charge is equal to:

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10^-3 C

10³C

10⁶C

10^-6C

SI unit of electric intensity is:

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NC

NC^-1

NC^-2

NC^-3

The intensity level of whispering is:

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20 dB

30 dB

40 dB

50 dB

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

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

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

Mathematical formula of capacitance of a capacitor is:

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C = QV

C = Q/V

C = V/Q

C = V2/Q

The speed of sound in air at 0°C is:

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331ms^-1

376ms^-1

231ms^-1

386ms^-1

The speed of sound in iron at 25°C is:

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5950 m/sec

5900 m/sec

6950 m/sec

6940 m/sec

Which is the most suitable means of reliable continuous communication between an orbiting satellite and earth:

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Mecrowaves

Radio waves

Sound waves

Any light waves

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

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Physics 10th Class English Medium Unit 4 Online Test MCQs With Answers

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