Question # 1

Minimum number of semi conductor diodes required for full wave rectification are.

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1

2

3

4

The field is strong and uniform.

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Inside the solenoid

Surrounding of solenoid externally

Perpendicular to solenoid

All of above

The place for soring the nuclear waste is

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Ocean

Damping in earth

Damping in desert

Bottom of old salt mines

The maximum kinetic energy of emitted photo electrons depends upon.

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The intensity of incident light

Frequency of the incident light

Metal surface

Both frequency of incident light and metal surface.

The thermistors convert changes of temperature into.

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Light energy

Electric voltage

Heat

Sound

One of the applications of electrostatic induction is

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Laser

Photocopier

X ray machine

Wilson cloud chamber

The absolute electric potential at a point distance 20 cm from a charge of 2 uC is.

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9 x 10² V

9 x 10³ V

9 x 10⁴ V

9 x 10 ⁵ V

Platinum wire becomes white at a temperature of.

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1600^oC

1300^oC

1100^oC

900^oC

The binding energy per nucleon is maximum for

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Helium

Iron

Potassium

Radium

The circuit in which current and voltage are in phase, the power factor is:

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Zero

1

-1

2

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

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North pole

South pole

Are ionized

None of these

For Paschen series, the value of 'n' starts from

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2

4

6

8

Which one of the following is not affected by electric or magnetic field.

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Beta rays

Gama ryas

Alpha rays

Electron

Impedance is denoted by:

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A

Z

P

Q

The permeability of free space is measured in

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wb A/m

Am/wb

wb/Am

m/wbA

The energy of photon for photoelectric effect is less than

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1 MeV

2 MeV

5 MeV

8 MeV

The fraction change in resistance per Kelvin is known as:

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Temperature coefficient of Resistance

Coefficient of voltage of change

Thermal expansion

All of the above

The circuit which compares the two voltages is.

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LDR

Sensor

Comparator

Logic gate

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