Question # 1

The longest wavelength of Paschen series is.

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656 nm

1094 nm

1875 nm

2000 nm

e.m.f is the conversion of --------------- energy into electrical energy

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Chemical

Solar

Light

None of these

If an electron is prijected in a magnetic field with velocity V, it will experience a force

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Electron volt is unit of:

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Chemical energy

Potential energy

Nuclear energy

heat energy

In carbon resistors, then value of Blue colour is.

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6

7

8

9

Laser is a device which can produce:

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Intense beam of light

Coherant beam of light

Monochromatic beam of light

All of the above

The current induced can be increased by:

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Using a stronger magnetic field

Moving the loop faster

Replacing the loop bay coi of many turns

All of above

The sensitivity of galvanometer directly depends upon

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Magnetic field

Area of coil

Both a and b

None of a, b, c

Farad is defined as

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"Coulomb/Volt

Ampere /Volt

Coulomb /Joule

Volt/Coulomb

The unit of resistance is:

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Ω

Ωm

Ω^-1m^-1

Ωm^-1

A device which converts low voltage or current to high voltage or current is called.

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Transformer

AC generator

Amplifier

Rectifier

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

In order to measure potential difference voltmeter is always connected in.

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Series

Parallel

Both a and b

Neither in series nor in parallel

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

Metals are good conductors of electricity because they have

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Large number of bounded electrons

Small number of electrons

Large number of free electrons

Small number of free electrons

The current flowing through each resistor of equal resistance in parallel combination is.

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Same

Different

Zero

Infinite

Reflecting mirrors in laser is used to

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Further stimulation

For producing more energetic lasers

Both (a) and (b)

None of these

In Compton scatting, the value of shift is equal to Compton's wavelength, when X-rays is scattered at the angle of.

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90^oC

Zero

120^oC

45^oC

The output voltage of a rectifier is.

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Smooth

Pulsating

Alternating

Per featly direct

Charge on an electron was determined by

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Ampere

Millikan

Maxwell

Bohr

A capacitor is perfectly insulator for:

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Direct current

Alternating current

Direct as well as alternating current

None of these

The motional emf depends upon the

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Length of conductor

Speed of conductor

Strength of magnet

All of these

The basic circuit element in A.C. circuit which controls current.

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Resistor only

Capacitor only

Inductor only

All of these

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