Question # 1

From which of the following we can get information almost about everything:

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Book

Teacher

Computer

Internet

Totally reflecting prism is used in:

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periscope

binoculars

periscope and binocular

telescope

Angle opposite to the base of triangle of prism is called:

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angle of incidence

angle of refraction

angle of prism

emerging angle

In a convex mirror the size of the image:

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Is smaller than the size of the object

Is greater than the size of the object

Depends upon the position of the object

Is equal to the size of the object

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

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Princpal focus

Focal length

P

Image

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

When light passes through a prism it deviates from its original path due to:

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Reflection

Diffraction

Interference

Refraction

Optical fibre are:

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Cheap

Flexible

Lighter

All of these

The loudness of a sound is most closely related to its:

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Frequency

Period

Wavelength

Amplitude

If focal length of a lens is 1m, then its power will be:

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1 D

0.5 D

1.5 D

1 D

The distance between two consecutive waves compressions or rarefactions is called:

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Focal length

Wave length

Frequency

Time period

How does sound travel from its source to your ear:

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By changes in air pressure

By vibration in wires or strings

By electromagnetic waves

By infrared waves

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