Question # 1

The temperature at the centre of sun is.

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10 million k

20 million k

30 million k

35 million k

Current is equal to:

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IR²

CV

Q/t

IR

The substances which do not have free electrons are called:

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Insulators

Conductors

Semiconductors

None of these

The current used in houses is:

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A.C.

Conventiona current

Current

D.C

F=

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qE

q-E

q/E

q+E

The direction of induced e.m.f. in a circuit is in accordance with conservation of.

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Mass

Charge

Momentum

Energy

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

Resistance of conductor is directly proportional to:

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Length

Pressure

Area

All of these

To see from submarine and the ship at the surface of water, we use:

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Telescope

Microscope

Periscope

Prism

The product of frequency (f) and wavelengthλ is equal to:

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Time period

Amplitude

Wave speed

Wave energy / frequency

Analogue quantity is:

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Time

Pressure

Distance

All of these

Astronauts in space need to communicate with each other by radio links because:

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Sound waves travel very slowly in space

Sound waves travel very fast in space

Sound waves cannot travel in space

Sound waves have low frequency in space

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

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