Question # 1

CD which is made of soft material is called:

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Hard disk

Floppy disk

Iron disk

Copper disk

Hard disk is made of:

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Aluminium

Copper

Iron

Plastic

The minimum value of angle of deviation is called:

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Minimum angle

incident angle

angle of minimum deviation

None of these

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

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Frequency

Period

Wavelength

Amplitude

The distance of image from mirror is represented by:

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q

p

F

m

Which form of energy is sound:

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Electrical

mechanical

Thermal

Chemical

When a ray of light enters from denser medium to rare medium, the angle of incidence for which angle of refraction is 90^o is called:

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angle of incidence

critical angle

angle of refrection

None of these

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

An object of placed at he centre of curvature of a concave mirror. The image produced by the mirror is located:

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out beyond the centre of curvature.

at the centre of curvature

between the centre of curvature and the focal point

at the focal point

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

Mathematical relationship between critical angle "C" and refractive index "n" is:

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N = C

N = 1 / sin c

N = 1 / cos c

N = 1 / sin2 c

Magnification of mirror is given by:

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m=p/q

m=q/p

m=pxq

m=1/p+q

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