Question # 1

In A.C. generator , when plane of coil is perpendicular to magnetic field, then output of generator is.

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NwAB

2pi f

Maximum

Zero

For rectification we use.

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Transformer

Diode

Choke

Generator

Which pair belongs to hadrons.

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Protons and Neutrons

Neutrons and electrons

Photons and electrons

positrons and electrons

Which material should be inserted between the plates of a capacitor in order to increase its capacitance.

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Copper

Mica

Iron

Tin

The magnetic field inside solenoid is given:

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μ_∘nI²

μ_∘nI

μ_∘n/1²

μ_∘I/n

In a transistor, collector current is controlled by:

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Collector voltage

Base current

Collector resistance

All of the above

Which one belongs to lepton's group

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Electron

Muons

Neutrons

All of these

The concept of direction is purely

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Relative

Absolute

Relative to the motion

None of these

The mean value of A.C. in a cycle is.

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1

0

I2

Nil

The unit of work function is

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Electron volt

Ampere

Volt cell

Hz

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

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Circulation of blood

Cancer

Heart Attack

Thyroid glands

Doping is made comparatively larger in

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Emitter

Base

Collector

P -type semi conductor

Number of Isotopes of Neon gas are

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2

3

4

1

The binding energy for_________ is maximum.

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Copper

Glass

Iron

Aluminum

The value of Stefan is constant is:

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4.57 x 10^-8 m²k²

5.67 x10^-8 wm^-2k^-4

6.67x 10^-11 wm²k⁴

7.45 x 10^-9 m² wk³

Which is true for both alpha particle and gama rays.

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They cause ionization in air

They can be deflected by electric field

They can be deflected by magnetic field

The y can penetrate a few millimeters of aluminium

The head produced by the passage of current through a resistor is.

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H= I²Rt

H = IR²t

H = 1/Rt

H = I²/Rt

Photo electrons are emitted y using visible light when the metal is.

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sodium

Copper

Nicked

Cobalt

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