Question # 1

The impurity in the germinium is usually in the ratio of

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1:10⁶

1:10⁴

1:10⁸

1:10¹⁰

The heat produced by passage of current.

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H=I²Rt

H=IR2T

H=I/Rt

H=I²/Rt

In current carrying long solenoid the magnetic field produced does not depend upon.

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The radius of solenoid

Number of turns per unit length

Current flowing through solenoid

All of the above

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Target material used in x-rays tube have following properties.

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High atomic number and high melting pouint

High atomic number and low melting pouint

Low atomic number and low melting pouint

High atomic number only

The photoelectric effect predicts that light is made of

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Photons

Neutrons

Protons

None of these

The total flux through a closed surface.

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Directly proportional to shape and geometry

Independent of medium

Depend on shape and geometry

Dependent on medium and the charge enclosed

Which is not characteristic of Laser.

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Monochromatic

Coherent

Intense

Multi direction

When the back emf in a current is zero, it draws

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Zero current

Maximum current

Minimum current

Steady average current

At resonance, the behavior of R-L-C series circuit is.

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Resistive

Capacitive

Inductive

Modulative

The numerical value of Compton wavelength is equal to

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3.43 x 10^-12 m

1.43 x 10^-12m

2.43 x 10^-12m

0.43 x 10^-12m

Two oppositely charged balls A and B attract the third ball C, when placed near them turn by turn The third ball C must be.

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Positively charged

Negatively charged

Electrically neutral

Positively and negatively charged

In AC system we generate sine wave form because:

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It san be easily draw

It produces least disturbance in electrical circuits

It is nature standard

Other waves cannot be produced easily

The minimum energy required for occurrence of pair production is:

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1.022eV

1.02keV

1.02Me.V

1.04MeV

Which is not true for X rays

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X rays are not defected by electric field

X rays are polarized

X rays consist of electromagnetic waves

X rays can be diffracted by grating

The moderator used in a nuclear reactor

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Sodium

Uranium

Graphite

Cadmium

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

Reverse current flows due to

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Majority charge carriers

Minority charge carriers

Electrons

Holes

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