Question # 1

If the separation between the plates of a capacitor is doubled then its capacitance become.

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Double

Half

One fourth

Three times

Conversion of A.C into D.C is called:

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Compton effect

Rectification

Amplification

Pair production

The effective way to increase the sensitivity of moving coil galvanometer is.

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Increase the area of coil

Increase the number of turn

Increase the magnetic field

Increase the value of constant C

The internal resistance of a capacitor is called:

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Impedance

Resistance

Reactance

Conductance

A photon while passing thorugh a magnetic field are deflected towards:

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North pole

South pole

Are ionized

None of these

The Compton effect is associated with

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X-rays

y-rays

Positive rays

ß-rays

Energy produced due to fission of uranium atom is:

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500MeV

200MeV

700MeV

750MEV

The series in visible region is:

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Balmer series

Pfund series

Paschen series

None of above

Minimum energy needed to escape an electron ofrm metal surface is called:

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Threshold energy

Threshold frequency

Work function

Work ability

A moving charge is surrounded by:

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2 Fields

3 Fields

4 Fields

None of these

Gamma rays from cobalt -60 are used for treatment of.

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Circulation of blood

Cancer

Heart Attack

Thyroid glands

Recentaly a complex crystalline structure known as yttrium barium copper oxide (Yba₂Cu₃O₃) have reported to become super conductor at

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163 K

169 K

200 K

100 K

In A.C circuit of inductor which one is true

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Voltage leads current by phase angle π/2

Voltage lags current by π/2

Current leads voltage by π/2

Both remain in phase

Magnetic effect of current is used

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To detect a current

To measure a current

In electric motor

All of above

In self induction A coil is connected in__________ with battery and a rheostat.

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Parallel

Series

Both A and B

None of above

Internal frame is a frame is which

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1st law holds

2nd law holds

3rd law holds

Kelvin's law holds

Mutual induction has a practical role in the performance of the.

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Radio choke

Transformers

A.C. Generator

D.C. Generator

When a nucleus emits alpha particle its atomic mass decreases by

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1

2

3

4

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