Question # 1

The place for soring the nuclear waste is

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Ocean

Damping in earth

Damping in desert

Bottom of old salt mines

When the K.E. of photoelectric is zero, the frequency of incident photon is.

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Less than

greater than

Equal to

Much greater

The temperature of core of nuclear reactor is:

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1100°C

1200°C

1300°C

1400°C

High frequency radio wave is called as

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Fluctuate

Carrier wave

Matter wave

Mechanical wave

The resistivity of --------------------decrease with the increase in temp

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Gold

Silver

Copper

Silicon

Unit of impedance is:

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Ohm

Ohm^-1

no unit

Ohm m^-1

An atom can reside in excited state for

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10^-8 second

One second

10^-10 second

More than one second

The brightness of the spot of CRO screen is controlled by.

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Anode

Cathode

Grid

Deflecting plates

There are different crystal systems. The number of these crystal system is.

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3

4

5

7

An electric field cannot deflect

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X-rays

a-particles

ß-particles

None of these

In order to measure potential difference voltmeter is always connected in.

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Series

Parallel

Both a and b

Neither in series nor in parallel

The SI unit of magnetic induction Tesla is equal to

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N-1 Am

NA m2

NA-1n2

NA-1m-1

A moving charge is surrounded by:

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2 Fields

3 Fields

4 Fields

None of these

If the resistance of 500 Ohm have fourth band of silver colour then its upper maximum resistance will be.

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600 Ohm

550 Ohm

450 Ohm

400 Ohm

Two parallel wires carrying currents in the opposite direction.

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Repel each other

Attract each other

Have no effect upon each other

They cancel out their individual magnetic fields.

Due to polarization, electric field E.

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Increase

Decrease

First increases then decreases

Remain same

Photodiode is used for:

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Detection of current

Detection of heat

Detection of light

Both a & b

Electron vibrating 94,000 times each second will produce radio waves of frequency.

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94 Hz

940 HZ

94 Hz

490 Hz

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