Question # 1

Which of the following is similar to electron.

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Beta particle

Alpha particle

Neutron

Proton

Energy stored in inductor is.

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1/2 L I²

1/2 LI

1/2 L2I

1/2 L2I2

The magnetic field inside solenoid is given:

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μ_∘nI²

μ_∘nI

μ_∘n/1²

μ_∘I/n

A wire stretched to double of its length, its strain is:

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2

1

0

0.5

The slope of q-t curve at any instant of time gives.

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Voltage

Current

Charge

Botha a and b

If 13.6 eV energy is required to ionize the hydrogen atom, then the required energy to remove an electron from n=2 is:

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10.2 eV

0 eV

3.4 eV

6.8 eV

Intensity of field inside a hollow charged sphere will be.

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Negative

Unaffected

Zero

Maximum

The electric flux through closed surface depends upon

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Charge

Medium

Geometry

Charge and Medium

When a nucleus emits an alpha particle, its atomic mass decreases by

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1

2

3

4

The Kirchhoff 1^st rule is manifestation of:

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Law of conservation of mass

Law of Conservation of charge

Law of conservation of energy

None of above

Which of the following has bulk modulus?

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Water

Gas

Honey

All

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

A semiconductor in its extremely pure form is known as:

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Intrinsic

Extrinsic

Both a and b

None of above

In an N-type silicon, which of the following statement is true?

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Electrons are majority carriers & trivalent atoms are the dopants

Electrons are majority carriers & pentavalent atoms are the dopants

Holes are minority carriers & pentavalent atoms are the dopants.

Holes are minority carriers & trivavalent atoms are the dopants.

An electron enters the magnetic field at right angle from left, B is into paper. The electron will be deflected.

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upward

To ward right

Down ward

Toward left

For Paschen series, the value of 'n' starts from

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2

4

6

8

If the kinetic energy of a free electron doubles, its de Broglie wavelength changes by the factor.

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√2

1/√2

2

1/2

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