Question # 1

For Holography we use

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X ray

Laser

gama rays

Beta rays

The substance which atom cooperates with each other in such a way so as to exhibit a strong magnetic field is called.

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Ferromagnetic

Paramagnetic

Diamagnetic

Non magnetic

With the speed of motor, magnitude of back emf

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Remain same

Increase

Decrease

First increases then decreases

Xc =

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1/2πfc

2πfc

2π/fc

fc/2π

When some di electric is inserted between the plates of a capacitor, then capacitance.

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Decreases

Increases

Becomes zero

Becomes infinity

Galvanometer is sensitive when C/BAN is

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zero

Large

small

Negative

The unit of conductivity is:

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Ohm^-3m^-1

Ohm m^-1

Both a and b

Ohm m^-1

Tolerance of "Gold" band.

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±10%

±5%

±15%

±20%

Heat sensitive resistors are called.

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resistors

Capacitor

Thermistors

Inductors

At high frequency the value of reactance of capacitor will be.

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Small

Zero

Large

Infinite

A certain wire has a resistance R, the resistivity of an other wire of an identical material with the first, except for twice its diameter is.

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1/4 R

4R

2R

Same as R

Electro magnetic waves emitted from radio antenna are.

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Stationary

Longitudinal

Transvers

Both a and b

An inductor of 1 henry inductance has a reactance 500 ohms, then the frequency required is approximately

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50 Hz

100 Hz

80 Hz

120 Hz

Photo diode is used for detection of.

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Heat

Magnet

Current

Light

In a pure inductive A.C. circuit the current.

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Lags behind voltage by 90 ^o

Leads the voltage by 90 ^o

In phase with voltage

Leads the voltage by 270 ^o

A moving charge is surrounded by:

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2 Fields

3 Fields

4 Fields

None of these

For step down transformer

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Ns>Np

Np > Ns

Ns = Np

Ns > > > Np

In full wave rectification number of diodes required are equal to.

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2

3

4

5

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