Question # 1

The point through which rays of light pass after reflection from concave mirror is called principal:

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Focus

Circle

Axis

Radius

The refractive index of internal coating of optical fibre is:

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1.56

1.51

1.53

1.58

The mirror whose inner surface is reflecting is called:

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Concave mirror

Convex mirror

Miroor

Lens

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

Totally reflecting prism turns the incident ray at an angle of:

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90^o

60^o

75^o

45^o

Bouncing back of light after striking the surface is called:

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Refraction

Reflection

Diffraction

Interference

____________ is always virtual in case of convex mirror.

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p

image

object

all of these

A device which has two ways communication is:

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Television

Radio

Hard disk

Mobile phone

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

For a normal person audible frequency range for sound wave lies between:

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10 Hz and 10kHz

20Hz and 20 kHz

25 Hz and 25 kHz

30Hz and 30 kHz

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

Magnification of mirror is given by:

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m=p/q

m=q/p

m=pxq

m=1/p+q

The data stored in C.D is:

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680 MB

650 MB

700 MB

750 MB

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

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 loudness of a sound is most closely related to its:

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Frequency

Period

Wavelength

Amplitude

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

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100 m

10 m

1 m

0.1 m

To see stomach problems we use:

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Gastroscope

Bronchoscope

Cystoscope

All of these

The line which passes through pole of the mirror and center of curvature is called principal:

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axis

Focus

Line

None of these

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