Question # 1

The distance between principal focus and pole of mirror is called:

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Princpal focus

Focal length

P

Image

In a vacuum all electromagnetic waves have the same:

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Speed

frequency

amplitude

wavelength

Which part of a D.C. motor reverses the direction of current through the coil every half-cycle.

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The armature

The commutator

The burshes

The slip rings

Focal length for concave mirror is :

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-ve

+ve

same

none of these

1 KB =______________

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1022 bytes

1023 bytes

1024 bytes

1025 bytes

the water waves after striking the hurdle will:

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reflect

refract

diffract

all a b and c

A conductor of electric current is:

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Wood

Rubber

Plastic

Copper

Which device has two coils, primary and secondary?

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D.C. Motor

Transformer

A.C. genrator

a and b

1 volt is equal to:

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JC

JC^-1

JC^-2

JC^-3

The angle of which prism deviates the incident ray is called:

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angle of incident

angle of reflection

angle of deviation

angle of minimum deviation

If the potential energy of none coulomb charge is one joule then its potential will be:

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5 volt

2 volt

3 volt

1 volt

Safe level of noise depends on factors:

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One

Two

Three

Four

Critical angle for diamond is:

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60^o

24^o

26^o

49^o

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