Question # 1

Iron core is used in tranformer to:

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Enhance the flux

Decrease the flux

Keep flux the same

botha a and b

The property of substance, which opposes the flow of current through it is called:

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Resistance

Reactance

Resistivity

None

The particles emitted from a hot cathode surface are:

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Positive ions

Negative ions

Protons

Electrons

At mean position of pendulum, the potential energy of the pendulum is:

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Maximum

Minimum

Much more

Both a and c

If a ray of light is glass is incident on an air surface at an angle greater than the critical angle, the ray will.

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refract only

reflect only

partially refract and partially reflect

Diffract only

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

Astronauts in space need to communicate with each other by radio links because:

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Sound waves travel very slowly in space

Sound waves travel very fast in space

Sound waves cannot travel in space

Sound waves have low frequency in space

What is fitted in telephone receiver:

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Electromagnet

Diaphragm

Both a and b

None

A paper capacitor is usually available in the form of:

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Tubes

Rolled foil

Disc

Plates

The wave properties

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Reflection

Refraction

Diffraction

All of these

Electric potential and e.m.f.

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are the same terms

are the different terms

have different units

both b and c

Program up gradation refers to:

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Program enhancement

Program identification

Program development

Program implementation

Radio waves are:

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Electric waves

Electromagnetic waves

X-rays

Radio active ways.

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