Question # 1

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

If we double the distance between two charges, what will be the change in the force between them?

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Half

Double

One fourth

Four times

It is used in satellite communication:

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Radio waves

Micro waves

Light waves

Electrical waves

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

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Book

Teacher

Computer

Internet

The half of carbon 14 is

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5720 years

5730 years

5740 years

5750 years

Level of noise recommended in eight, hour work day:

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80-90 dB

80-85- dB

85-90 dB

90-95 dB

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

Optical fibers work on the principle of:

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Refraction

Reflection

Total internal reflection

Diffraction

A converging mirror with a radius of 20cm 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 voltage is decreased by:

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Step-up transformer

Step-down transformer

A.C. generator

D.C. Motor

Radiation was found in:

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1896

1895

1897

1898

In case of OR and AND operation, if switches s₁ and s₂ both are open then lamp is:

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On

Off

Sometimes on and sometimes off

Neither on nor off

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

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q

p

m

F

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