Question # 1

Efficiency of transformer does not affected by

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Input voltage

Core of transformer

Insulation between sheet

Resistance of coils

1 amu is equal to

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1.0606 x 10^-27 kg

1.66 x 10^-31 kg

1.66 x 10^-34 kg

1.66 x 10^-19 kg

Energy stored in an inductor is:

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1/2L²I

1/2L²/I

_1/2LI²

1/2LI

Donor impurities are

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Germanium, silicon

Indium, galium

Antimony, arsenic

Diamond, carbon

The reciprocal of decay construct lamda of a radioactive element is.

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Half life

Mean life

Curie

total life

A charge Q is divided into tweo parts q and Q-q and seperated by a distance R. The force of equilibrium between them will be maximum when:

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q=Q/4

q=Q/2

q=Q

None of these

Total flux through a closed surface depends on.

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Shape of surface

Medium only

Charge enclosed only

Charge and Medium

Potassium Cathodes in photocell emit electrons for a light.

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Visible

Infra red

Ultra violet

X rays

If 1 x 10⁷ electrons passes through a conductor in 1.0 micro second , then the current is.

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2 A

1.6 A

2.6 x 10^-6 A

1.6 x 10^-6 A

The dimension of stress is

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[MLT^-1]

[ML^-1T]

[ML^-1T^-1]

[ML^-1T^-2]

The first theory about the structure of an atom was introduced by

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Neil Bohr

Einstein

Compton

Rutherford

Reverse current flows due to

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Majority charge carriers

Minority charge carriers

Electrons

Holes

A soft iron cylinder is placed inside coil galvanometer to:

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Make field circular and strong

Make field radial and weak

Make field radial and strong

All of above

The electric field lines are closer where the field is

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Strong

Weak

Uniform

Variable

Compton's effect is associated with

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gamma rays

Beta rays

X rays

Positive rays

The place for soring the nuclear waste is

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Ocean

Damping in earth

Damping in desert

Bottom of old salt mines

Two resistance of 2 Ohm each are connected in parallel combination equivalent resistance will be.

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4 Ohm

2 Ohm

1 Ohm

8 Ohm

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

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