Question # 1

In D.C.motor split rings are made of:

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Steel

Carbon

Copper

Iron

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

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Ultrasonic

Infrasonic

Audible

Echo

The unit of electrical energy is:

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Joule

Watt

Volt

Electron volt

Diffraction of wave can be observed clearly only when the size of slit or obstacle is nearly__________ to the wavelength of the wave:

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Two times

Equal

Four times

None of these

Which waves of the following has highest frequency?

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Radio waves

Micro waves

Light wave

Sound wave

The energy is transferred from one place to another:

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Through matter

Thouth waves

both a and b

None of these

Unlike charges always:

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Repel each other

Attract each other

Sometimes repel and attract each other

Both A and B

The unit of resistance is:

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Ω-m

Ω

V

C

The frequency of silent whistle is:

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20,000 Hz – 25000Hz

2000 Hz – 2500Hz

200 KHz – 2000 Hz

25000 KHz

What will be the capacitance of capacitor by joining them in parallel:

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Increased

Much less

Decrease

No change

The time period of mass attached with a spring can be calculated by:

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T = 2π√L/g

T = 1/T

T =2π√g/L

T = 2π√m/k

What is fitted in telephone receiver?

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Electromagnet

Diaphragm

Both a and b

None of these

AND operation is represented by:

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Dot (.)

Addition (+)

Division (÷)

Minus (-)

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