Question # 1

When a PN-Junction is reverse biased the depletion region is.

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Widened

Narrowed

Normal

None of these

The semi conductor diode has the property of

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Two way conduction

Zero conduction

One way conduction

Amplification

The impurity in the germinium is usually in the ratio of

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1:10⁶

1:10⁴

1:10⁸

1:10¹⁰

The ratio Beta in transistor is called.

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Voltage gain

Emitter gain

Current gain

Nuclear gain

In frequency modulation which factor changed.

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Amplitude of charge carriers

Frequency of charge carriers

Amplitude of signal

Frequency of signal

The electric field created by positive charge is:

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Radially outward

Circular

Radially inward

Zero

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

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2

1

0

0.5

Two parrallel, metal plates are a distance 8.00 m apart. The electric field between the plates in uniform, Directed toward the right , and has a magnitude of 4.00 N/C. If an ion of charge +2e is released at rest at the left-hand plate. What is its kinetic energy when reaches the right-hand plate?

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4 eV

64 eV

32 eV

16 eV

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

A real transformer does not change.

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Voltage level

Current level

Power level

Frequency

The rod of unit length is moving at 30 o through a magnetic field of 1 T. If the velocity of rod is 1 m/s, then induced emf in the rod will be given by

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I V

0.25 V

0.5 V

0.6 V

A capacitor stores energy in the form of.

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Magnetic field

Heat energy

Electrical energy

Mechanical energy

If the number of turns become double but length remain same, then magnetic field in the solenoid become.

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Half

Double

Remain same

Zero

The existence of positron in 1928 was predicted by

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Anderson

Dirac

Chadwick

Plank

An electron in H -atom is excited from ground state n=4 , How many spectral lines are possible in this case.

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6

5

4

3

the core of transformer is laminated so reduce.

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Magnetic loss

Hysteresis loss

Eddy current loss

Electric loss

The natural frequency of L.C circuit is equal to

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When platinum is it becomes orange at.

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500^oC

900^oC

1100^oC

1300^oC

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