Question # 1

Einstein photoelectric equation is

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None of these

The function of three anodes a C.R.O is

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To accelerate electrons only

To focus the electrons only

To control the brightness of spot on screen

To accelerate and focus the electrons

Coulomb's force is:

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Conservative force

None conservative force

Similar to frictional force

None of the above

The mathematical symbol for NOR operation is

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X = A . B

X = A + D

A voltmeter is always connected in

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Parallel

Series

Perpendicular

Straight line

A moving charge is surrounded by:

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2 Fields

3 Fields

4 Fields

None of these

Nuclear fission chain reaction is controlled by using.

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Cadmium rods

Iron rods

Platinum rods

Steel rods

Drum of photocopier is made of.

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Copper

Aluminum

Nickel

Cobalt

The p-n junction in which p side is connected to+ive and n-side is -ve the junction is said to be:

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Neutral

Forward biased

Reversed biased

None of above

The SI unit of decay constant is

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m

m^-1

S^-1

Nm^-1

An electron in H -atom is excited from ground state n=4 , How many spectral lines are possible in this case.

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6

5

4

3

When motor is just started, back emf is almost.

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Maximum

Zero

Minimum

Infinite

Mutual induction has a practical role in the performance of the.

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Radio choke

Transformers

A.C. Generator

D.C. Generator

The magnetic flux will be max, For an angle of:

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0°

60°

90°

180°

Gamma rays from cobalt -60 are used for treatment of.

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Circulation of blood

Cancer

Heart Attack

Thyroid glands

106 electrons are moving through a wire per second the current developed is:

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1.6 x 10-19 A

1 A

1.6 x 10-13A

106 A

Which is true for both alpha particle and gama rays.

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They cause ionization in air

They can be deflected by electric field

They can be deflected by magnetic field

The y can penetrate a few millimeters of aluminium

At resonance frequency, the impedance of RLC series circuit is.

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Maximum

Minimum

Zero

Infinite

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