Question # 1

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

A pentaralent impurity in Si

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a free electron and a free hole

a free hole

a free electron

No free particle

If the coil is wound on iron core, the flux through it.

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Decreases

Becomes zero

Increases

Remains constant

The emf induced by the motion of a conductor across a magnetic field is called:

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Motional emf

Rotational emf

Induced emf

All of above

The A.M. transmission frequencies range from

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540 KHz to 1000 KHz

540 Khz to 1600 KHz

520 KHz TO 1600 KHz

520 KHz TO 1400 KHz

The peak value of A.C source is 20 A, then its rms value will be.

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14.1 A

10 A

20 A

28.2 A

The unit of Plank's constant 'h' is.

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JC

J/C

JS

J/S

The electric field in some region of of space is uniform in magnitude and direction. Which one of the following five statements best desccribes the volume charge density (ρ) , in this region of space?

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ρ = 0

ρ decreases linearly in the direction of the electric field

ρ increases linearly in the direction of the electric field

ρ has a uniform value throughout the region

Which one of the following is crystalline solid.

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Zirconia

Glassy solid

Natural rubber

Poly strene

The main reason for world wide use of A.C is because:

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It is very high power

It can be transmitted over long distance

It is cheaper to use

ALl of above

Wave nature of light appears in

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Pair production

Compton effect

Photo electric

Interference

Charge on positron is:

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Negative

Positive

Netural

None of these

In a certain circuit, I_{B = 40 µA,}I_C= 20 mA

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450 amp

0.45 amp

5 m amp

500 amp

The SI unit of resistivity is.

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Ohm m-2

Ohm m-1

Ohm m

Ohm

Maximum Compton shift is observed at.

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30^oC

90^oC

45^oC

180^oC

The winding of the electromagnet in motor are usually called.

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Magnetic coils

Field coils

Electric coils

electric o electric coils

When platinum is it becomes orange at

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500^oC

900^oC

1100^oC

1300^oC

In extrinsic semiconductors doping is of the order of.

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1 atom to 10⁴

1 atom to 10⁶

1 atom to 10⁸

1 atom to 10³

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