Question # 1

A device which has two ways communication is:

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Television

Radio

Hard disk

Mobile phone

The totally reflectiing prism one angle is of:

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45^o

90^o

180^o

120^o

The ray of light striking to the side of prism is called:

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refraction ray

incident ray

reflected ray

emergent ray

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

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Book

Teacher

Computer

Internet

Which types of image is produced by the converging lens of human eye if it view a distant object?

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Real , erect, same size

Real, inverted, diminshed

Virtual, erect,diminshed

Virtual, inverted, magnified

Image formed on a camera is:

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real,invertred, and diminished

virtual, upright and diminshed

virtual, upright and magnified

real, inverted and magnified

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

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

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

What does the term e-mail stand for:

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Emergency mail

Electronic mail

Extra mail

External mail

The principal focus of a concave mirror is:

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Virtual

Real

Imaginary

Dual aspect

Astronauts in space need to communicate with each other by radio links because:

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Sound waves travel very slowly in space

Sound waves travel very fast in space

Sound waves cannot travel in space

Sound waves have low frequency in space

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

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

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Frequency

Period

Wavelength

Amplitude

A normal eye can see near objects clearly at a distance of:

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20 cm

25 cm

30 cm

35 cm

The refractive index of air is:

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6

7

2

1,0003

Snell's law is stated as:

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Sin i / sin r = n1/n2

sin i / sin r = n2/n1

sin r / sin i = n2/n1

sin r / sin i = 2n2/n1

The data stored in C.D is:

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680 MB

650 MB

700 MB

750 MB

Sun light consist of ____________ colour

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6

7

5

2

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