Question # 1

A cable breaks if stretched by more than 2mm. It is cut into two equal parts. How much either part can be stretched without breaking?

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25 m

1mm

2mm

0.5 m

The Direction of induced current is always so as to oppose the change which causes the current, is:

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Faraday's law

Lenz's law

Ohm's law

Kirchhoff' s1ast rule

Radio frequency choke is

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Iron cored

Air Cored

Air as well as iron cored

None of these

A simple device that prevents the direction of current from changing is called.

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Commutator

Rotor

Armature

Detector

Unit of decay constantλ is:

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ms

m^-1

m

S^-1

In purely resistive A.C circuit, instantaneous value of voltage and current:

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Current lags behind voltage

Current leads voltage by π/2

Both are in Phase

Voltage leads current by Pase θ=π/2

The number of electrons emitted depends upon

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Colour of target surface

Shape of surface

Frequency of incident light

Intensity of incident light

A positron is a particle having.

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Mass equal to electron

Charge equal to electron

Mass equal to mass of electron but charge opposite to charge of electron.

Mass equal to proton

Which factor does not affect the conductivity of PN-Junction diode.

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Doping

Temperature

Voltage

Pressure

Laser can be made by creating.

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Meta stable

Population inversion

Excited state

All of these

Light emitting diodes are made from semiconductors.

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Silicon

Germanium

Carbon

Gallium arsenide

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

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sodium

Copper

Nicked

Cobalt

Mass equivalent of 931 MeV energy is:

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6.02 x 10^-23 kg

1.766 x 10^-27kg

2.67 x 10^-29kg

6.02 x 10^-87kg

For computation of electric flux, the surface area should be.

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Parallel

Flat

Curved

Spherical

The self induction emf is some times called.

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Motional emf

Constant emf

Back emf

Variable emf

The first spectral lines were discovered in 1885, were

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Paschen series

Balmer series

Pfund series

Bracket series

Eddy current is produced when:

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A metal is light in varying magnetic field

A metal is kept in steady magnetic field

A circular coil is placed in a steady magnetic field

A current is passed through a circualr coil

Light of 4.5 eV is incident on a Cesium surface and stopping potential is 0.25 eV, maximum K.E. of emitted electron is.

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4.5 eV

4.25 eV

4.75 eV

0.25 eV

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