Question # 1

The digits used in electronics are:

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1

0

0 and 1

1 and 2

CD which is made of soft material is called:

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Hard disk

Floppy disk

Iron disk

Copper disk

Magnification of mirror is given by:

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m=p/q

m=q/p

m=pxq

m=1/p+q

Focal length for concave mirror is :

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-ve

+ve

same

none of these

The S.I unit of electric current is:

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Volt

Ampere

Coulomb

Watt

Watt is equal to:

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Coulomb per second

Newton per second

Volt per second

Joule per second

The critical angle for a beam of light passing from water into air is 48.8 degrees. This mean that all light rays with an angle of incidence greater than this angle will be:

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Absorbed

Totally reflected

Partially reflected and partially transmitted

Totally transmitted

The vacuum all electromagnetic wave have the same

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speed

frequency

amplitude

wavelength

J.J Thomson observed deflection of cathode rays in:

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1895

1896

1897

1998

Positive charge can be produced by:

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Combing in hair

Rubbing glass rod on silk

By rubbing ebonite rod on wool

By rubbing glass rod wool

electric intensity is a quantity:

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scalar

vector

base

none of these

An object is 14 cm in front of a convex mirror. The image is 5.8 cm behind the mirror. What is the focal length of the mirror:

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-4.1 cm

-8.2 cm

-9.9 cm

-20 cm

The speed of sound in iron at 25 ^oC is ms^-1

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5950

5900

6950

6940

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