Question # 1

A converging lens becomes a magnifying glass when an object is placed:

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Outside of focal length

Inside the focal length

Equal of focal length

At double of focal length

The intensity of lawn mover is:

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10^-1 wm^-2

10^-2wm^-2

10^-1wm^-3

10^-3wm^-2

1 GB =

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1022MB

1023 MB

1024MB

1025MB

A positive and negative charges are initially 4 cm apart. When they are moved closer together so that they are now only 1 cm apart, the force between them is:

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4 times smaller than before

4 times larger than before

8 times larger than before

16 times larger than before.

The S.I unit of electric current is:

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Volt

Ampere

Coulomb

Watt

The screen of a cathode ray tube consists of a thin layer of:

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Sodium

Nitrogen

Oxygen

Phosphorus

If the mass of the bob of a pendulum is increased by a factor of 3, the period of the pendulum’s motion will:

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Be increased by a factor of 2

Remain the same

Be decreased by a factor of 2

Be decreased by factor of 4

The principal focus of a concave mirror is:

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Virtual

Real

Imaginary

Dual aspect

The speed of sound in air at 0°C is:

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331ms^-1

376ms^-1

231ms^-1

386ms^-1

The voltage is decreased by:

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Step-up transformer

Step-down transformer

A.C. generator

D.C. Motor

Earth wire is connected to the:

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Power house

Transformer

Ground

Generator

At mean position kinetic energy of the ball is:

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Minimum

Zero

Maximum

10 J

Floppy has a storage capacity

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4-5 MB

3-4 MB

1-3 MB

3-6 MB

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