Question # 1

Binding energy for deuteron nucleus is given by

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2.8 MeV

2.23 MeV

2.28 MeV

2.25 MeV

The background radiation to which we are exposed, on the average is.

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1 mSv per year

2 mSv per year

3 mSv per year

4 mSv per year

In three phase A.C supply coils are inclined at an angle of.

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0^o

90^o

120^o

80^o

Magnetic effect of current is used

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To detect a current

To measure a current

In electric motor

All of above

The word amorphous means:

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Regular structured

Without form or structure

Frozen structured

None of above

A metal rod of 1 m is moving at a speed of 1 ms-1 in a direction making an angle 30^o with 0.5 T magnetic field . The emf produced is.

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0.25 N

2.5 N

0.25 V

2.5 V

The flow of D.C current is opposed by

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Resistor

Induction

Capacitor

All of these

The energy of 4th Orbit in hydrogen atom is.

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-2.51 eV

-3.50 eV

-13.60 eV

-0.85 eV

Electric intensity due to an infinite sheet of charge is:

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∂/2ε_∘

∂/rε_∘

∂/r2ε_∘

none of these

split rings are used in

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A.C. generator

A.C. motor

Transformer

D.C. motor

If a charge Q flows through any cross section of the conductor in time t, the current I is

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I=Qt

amu =

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1.06 x 10^-27 kg

1.6606 x 10^-27 kg

1.520 x 10^-21 kg

1.6606 x 10^-31 kg

Electromagnetic induction is exactly according to law of:

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Momentum

Charge

Energy

Mass

The emission of electrons from metal surface when exposed to light is called:

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Compton effect

Pair production

Photoelectric effect

None of above

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

Which one is not present in A.C. generator.

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Armature

Magnet

Slip rings

Commutator

When meta I is heated sufficiently electrons are given off by the metal. This phenomenon is known as.

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Photoelectric effect

Piezo electric effect

Thermionic emission

Secondary emission

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

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