Question # 1

Power of convex lens is 10 D. Its focal length is:

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100 m

10 m

1 m

0.1 m

The focal length is related to radius of curvature by the formula:

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f = 2R

f = 4R

f = R/2

R = f/2

Hard disk is made of:

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Aluminium

Copper

Iron

Plastic

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

Totallly reflected

Partially reflected and partially transmitted

Totally transmitted

The mirror whose outer surface is reflecting is called:

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Concave mirror

Convex mirror

Lens

Mirror

A converging mirror with a radius of 20 cm creates a real image 30 cm from the mirror. What is the object distance?

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5.0 cm

7.5 cm

15 cm

20 cm

The critical angle for glass to:

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24^o

48^o

42^o

50^o

When the object is placed beyond 2F of a convex lens, the image formed will be:

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Real, inverted and smaller than the object

Real, inverted and of the same size as the object

Real, inverted and larger in size than the object

Virtual, erect and larger in size than the object

To see from submarine the ship at the surface of water , we use:

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Telescope

Microscope

Peri scope

Prism

An example of input device computer is:

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Keyboard

printer

monitor

RAM

The centre of spherical mirror is called:

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Focus

Axis

Centre

Pole

In totally reflecting prism one angle is of 90^o, and other two angles are of:

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30^o,30^o

45^o,90^o

45^o,45^o

40^o,40^o

A data storage device is:

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Printer

Hard disk

Monitor

CPU

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