Question # 1

It is used in satellite communication:

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Radio waves

Micro waves

Light waves

Electrical waves

Image formed on a camera is:

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real,invertred, and diminished

virtual, upright and diminshed

virtual, upright and magnified

real, inverted and magnified

In electric motor, the brushes are made of:

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Lead

Graphite

Iron

Wood

The sound level of rustling of leave is:

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1 dB

20 dB

30 dB

10 dB

Bouncing back of light after striking the surface is called:

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Refraction

Reflection

Diffraction

Interference

The equivalent resistance of a parallel combination is

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equal to sum of all resistance

is greater than the largest resistance of combination

is smaller than the smallest resistance of combination

All of these

Time period is reciprocal of:

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Frequency

Cycle

Wavelength

Amplitude

SI unit of electric intensity is:

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Watt

NC^-1

NS^-1

Nm

In 1950, physicists observed that in cathode ray tube a special type of rays produced from cathode, these rays were called:

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Cathode rays

X-rays

Alpha rays

Gamma rays

Transformer works on _______ supply.

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A.C

D.C

Battery

Both A and B

The oscillations of a system in the presence of _____________ force are called amp oscillations:

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Resistive force

Attractive force

Both of these

None of these

D.C. motor converts.

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Mechanical energy into electrical energy

Mechanical energy into chemical energy

Electrical energy into mechanical energy

Electrical energy into chemical energy

Which of the following devices can be used to produce both a transverse and longitudinal waves:

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A string

A ripple tank

A helical spring (slinky)

A tuning fork

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