Question # 1

The filament of an electric bulb is made of:

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Nickel

Aluminium

Tungsten

Carbon

Sound waves having frequency lower than 20 Hz are called:

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Ultrasonic

Infrasonic

Audible

Echo

Which form of energy is sound?

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Electrical

Mechanical

Thermal

Chemical

The half -life of carbon is

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5730 years

5700 years

5720 years

572 years

Human skin, in dry conditions, has a resistance of:

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20,000 ohm

100,000 ohm

30,000 ohm

2000 ohm

The energy is transferred from one place of another:

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through matter

through waves

both a and b

through vacuum

The speed of sound in air at 0 ^oC is:

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331 ms^-1

332 ms^-1

333 ms^-1

336 ms^-1

The distance of spherical mirror is called:

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Curvature

Aperture

Sphere

a,b

Public address system is the example of :

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Analogue electronics

Digital electonics

Binary system

None of these

The open switch Boolean expression is represented by:

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0

1

10

2

To hear echo, the distance between the observer and the obstacle is 17m then how much distance will the sound travel?

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60m

54m

17m

34m

Capacitors are mainly used for radio frequency tuning:

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Paper capacitor

Air capacitor

Mica capacitor

Electrolytic capacitor

What should household appliances be connected in parallel with the voltage source?

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to increase the resistance of the circuit

to decrease the resistance of the circuit

to provide each appliance the same voltage as the power source

to provide each appliance the same current as the power source

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