Question # 1

The distance of the object from the mirror is represented by :

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q

p

m

F

The S.I unit of power of a lens is:

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Dioptre

Volt

Ampere

Watt

A device which has two ways communication is:

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Television

Radio

Hard disk

Mobile phone

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 angle of which prism deviates the incident ray is called:

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angle of incident

angle of reflection

angle of deviation

angle of minimum deviation

The refractive index of air is:

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6

7

2

1,0003

The distance of image from mirror is represented by:

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q

p

F

m

The minimum value of angle of deviation is called:

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Minimum angle

incident angle

angle of minimum deviation

None of these

Which of the following quantities is not change during refraction of light?

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Its direction

Its speed

its frequency

Its wavelength

Spherical mirrors are used in:

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Medical

Search light

Microscope

All of these

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

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100 m

10 m

1 m

0.1 m

If a ray of light is glass is incident on an air surface at an angle greater than the critical angle, the ray will.

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refract only

reflect only

partially refract and partially reflect

Diffract only

Which types of image is formed by a concave lens on a screen?

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Inverted and real

Inverted and virtual

upright and real

Upright and virtual

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

CD which is made of soft material is called:

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Hard disk

Floppy disk

Iron disk

Copper disk

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

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

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Focus

Circle

Axis

Radius

What does the term e-mail stand for:

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Emergency mail

Electronic mail

Extra mail

External mail

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