Question # 1

If the mass of a spring mass system is doubled, its time period becomes:

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√2 T

T/2

√T/2

T/√2

Which rays are used to send or receive digital information along aptical fibre:

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infrared

alpha rays

beta rays

mechanical

The reason carbon dating work is that.

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Plants and animals are such strong emitters of carbon 14

After a plant or animal dies, it stops in fresh carbon

There is so much non radioactive carbon dioxide in the air

When a plant or animal dies.

A large ripple tank with a vibrator working at a frequency of 30 Hz produces 25 complete waves in a distance of 50 cm.

The velocity of the wave is:

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53 cms^-1

60 cms^-1

750 cms^-1

1500cms^-1

The unit of power is _________

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Volt

Watt

Joule

Coulomb

According to Fleming's left hand rule the direction of force on the conductor is given by:

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Thumb

Fore finger

Middle finger

None of these

If current is flowing from bottom end to the top end in a wire, according to right hand rule the direction of line of forces would be:

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Anti-clock wise

Clock wise

Left and Right

Along the conductor.

The speed of sound of water at 25 ^oC is:

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1530 ms^-1

1531 ms^-1

1560 ms^-1

1570 ms^-1

Give the number of factors which affect the ability of a capacitor to store charge.

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2

3

4

5

A device which has two way communication is:

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Television

Radio

Hard disk

Mobile phone.

V²/R=:

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Power

Energy

Voltage

Resistance

How Galvanometer is connected in circuit to detect current:

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In series

In parallel

Fixed

Variable

The speed of sound in air at 21 °C is:

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336ms^-1

343ms^-1

430ms^-1

470ms^-1

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