Question # 1

The use of LDR is in the circuit of.

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Logic gate

Rectifier

Oscillator

High Switch

The potential difference across depletion region in case of Si is

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0.6 volt

0.9 volt

0.7 volt

0.2 volt

A.C. can be converted into D.C. by

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An oscillator

Detector

An amplifier

Rectifier

The value of e/m is smallest for

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Proton

Electron

Beta particle

Positron

Unit of self inductance is

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Weber

Tesla

Henry

Farad

The combined effect of resistance and reactance in circuit is called:

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Impedance

Inductance

Capacitance

None of above

Which is not characteristic of Laser.

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Monochromatic

Coherent

Intense

Multi direction

The number of neutrons in Li are

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2

3

4

7

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

If the length and number of turns of a solenoid are doubled strength of magnetic field with.

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Be doubled

Become half

Not change

Be four time

A current generator device converts:

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Mechanical energy into chemical energy

Chemical energy into electrical energy

Mechanical energy into electrical energy

Both b and c

1 rad =

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0.001Gy

0.01Gy

0.1Gy

1.01Gy

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's 1st rule

A metal rod of 1 m is moving at a speed of 1 ms-1 in a direction making an angle 30^o with 0.5 T magnetic field . The emf produced is.

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0.25 N

2.5 N

0.25 V

2.5 V

For ohmic device the graph between V and I is.

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A straight line

Curve

Hyperbola

Parabola

split rings are used in

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A.C. generator

A.C. motor

Transformer

D.C. motor

The unit for Plank's constant is:

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Js^-1

Jm

Js

Jm²

Electric intensity due to an infinite sheet of charge is:

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∂/2ε_∘

∂/rε_∘

∂/r2ε_∘

none of these

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