Question # 1

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Lenz's law

Faraday's law

Ampere's law

None of these

The impurity in the germinium is usually in the ratio of

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1:10⁶

1:10⁴

1:10⁸

1:10¹⁰

Charge carriers in electrolytes are.

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Protons

Electrons

Holes

Positive and Negative ions

A capacitor is charged with a battery and then it is disconnected. A slab of dielectric is now inserted between the plates, Then

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The charge in the plates reduces and potencial difference increase

Potencial difference between the plates increase, stored energy decreases and charge remains the same

Potencial difference between the plates decreases, stored energy decreases and charge remains unchanged

None of them

The direction of induced current is always so as to oppose the change which causes the current, this is the statement of

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Lenz's law

Faraday's law

Ampere's law

Coulomb's law

Vrms =

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0.7V_∘

0.07V_∘

0.007V_∘

0.75V_∘

The SI unit of E is NC-1 and that of B is Na-1 m-1 then the unit of E/B is.

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ms-2

ms

ms^-1

m-1s-1

There are different crystal systems. The number of these crystal system is.

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3

4

5

7

If magnetic field is doubled then magnetic energy density becomes.

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Four times

Two times

Three times

Six times

Identify the practical application of electrostatic force.

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Inkjet printer

x rays

Laser

A.C. Generator

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

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Widened

Narrowed

Normal

None of these

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 unit of permiability of free space is:

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T.m/A

T.m²/A

T.m/A²

None of these

A capacitor is perfect in insulator for.

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Alternating current

Sparking current

Eddy current

Direct current

Half life of Uranium -239 is

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26.5 minutes

24.5 minutes

25.5 minutes

23.5 minutes

The gain of transistor amplifier depends upon

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Resistance connected with collector

Resistance connected with base voltage

Input voltage

Output voltage

Which pair belongs to hadrons.

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Protons and Neutrons

Neutrons and electrons

Photons and electrons

positrons and electrons

Specific resistance of a material depends upon.

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Length

Area

Temperature

Both A and B

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