Question # 1

e/m=

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v/Br

Br/V

VB/r

Vr/B

Step up transfer has a transformation ratio of 3:2. What is the voltage in secondary , If voltage in primary is 30 V?

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45 V

15 V

90 V

300 V

The ability of a body to return to its original shape is called.

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Strain

Stress

Elasticity

Plasticity

Unit of Stephen's constant is

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W m K^-2

W m^-2 K^-4

W m K^-4

None

Phase difference between V and I of an A.C through resistor is.

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Zero Degree

90 ^o

80^o

120^o

For rectification we use.

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Transformer

Diode

Choke

Generator

An electron miroscope emplys which to one of the following particles?

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Electron ahve a wave nature

Electrons can be focused by an electric field

Electrons can be focused by a magnetic field

All of the above

In A.C. inductor behaves as

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Capacitor

Resistor

Commutator

Transistor

The toner of printer is given

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Positive charge

Negative charge

Neutral

First positive then negative

Electro encephalon graph is the diagnostic test for the working of.

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Eye

Heart

Brain

Lungs

Selenium is

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Insulator is dark

Insulator in light

Conductor in dark

Semi conductor in dark

Eddy current is produced when:

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A metal is light in varying magnetic field

A metal is kept in steady magnetic field

A circular coil is placed in a steady magnetic field

A current is passed through a circualr coil

The value of capacitive reactance is given by

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Xc = VI

All of above

Coercive force is used to

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Demagnetize the material

Magnetize the material

Extend it

None of these

The amount of energy equivalent to 1 a.m.u is

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931.5 MeV

93.15 MeV

9.315 MeV

2.224 MeV

The longest wavelength of Paschen series is.

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656 nm

1094 nm

1875 nm

2000 nm

1 tesla =

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1 MAm^-1

1NA^-1m

1NA^-1m^-1

None of above

There is no charge in A and Z of any radioactive element by the emission of.

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Alpha particle

Beta particle

Gama particle

X- rays

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