Question # 1

The ray of the light after reflection from concave mirror passes through:

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Centre

Principal focus

Pole

None of these

The ratio of image height to object height is called:

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Linear magnification

Power

Refraction

Radius of curative

Eight bits combine to form:

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A byte

Megabyte

Kilobyte

Gigabyte

For the emission of electrons from the tungsten filament the values of current and voltage are taken as:

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0.1 A and 2V

0.2 A and 4V

0.3A and 6V

0.4A and 8V

The wave properties

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Reflection

Refraction

Diffraction

All of these

Electric field lines:

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always cross each other

never cross each other

cross each other inthe region of strong field

cross each other in the region of weak field

The frequency of silent whistle is:

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20,000 Hz – 25000Hz

2000 Hz – 2500Hz

200 KHz – 2000 Hz

25000 KHz

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 SI unit of electric field intensity is:

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NC-2

NC-1

Ns

Nm-1

Information storage devices work on the principles of

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Heat

Sound

Light

Magnetism

When did Michael Faraday discover Electromagnetic induction?

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1841

1831

1821

1811

The characteristics of sound by which we can distinguish between two sounds of same loudness and pitch is called.

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Intensity

Quality

Loudness

Pitch

The force applied on the mass attached with a spring is represented by:

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F_a

F_c

F_ext

F_s

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