Question # 1

Pure silicon has valence electrons

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1

2

3

4

The resistance of a wire does not depend upon.

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Area of cross section of the wire

Length of the wire

Temperature of the wire

Current passing though the wire

Which one of the following describes a measure of opposition to alternating current.

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Electrical impedance

Capacitance

Inductance

Admittance

A torch bulb uses a 3 V supply and makes a current of 0.2 A It is switched on for one minute How much electrical energy is used.

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0.6 J

12 J

24 J

36 J

When a pentavalent material like arsenic is added to a tetravalent material such as germanium, we get a.

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n-type material

p -type material

diode

super conductor

The vertical component of earth's magnetics field is zero.

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At magnetic poles

At geographical poles

At magnetic equator

Everywhere

Which given material is the best for making connecting wires

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Nichrome

Iron

Gold

Copper

Which part of D.C motor reverses the direction of current through the coil every half cycle.

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The armature

The commutator

the brushes

The slips rings

The rectangular coil in galvanometer is made up of.

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Bare copper wire

Insulated aluminum wire

Enameled copper wire

Enameled steel wire

If the transformer turns ratio is 2 and the impedance eof primary coil is 250 Ohms then the impedance secondary coil will be.

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125 Ohms

250 Ohms

500 Ohms

1000 Ohms

A substance which has empty conduction band.

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Insulator

Conductor

Semi conductor

super conductor

Direct current generators use.

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Coiled rings

Split rings

slip rings

solenoid rings

The dot product of electric intensity and area of a surface is equal to.

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Magnetic flux

Electric flux

Motional emf

Induced emf

The patch followed by charge in an electric field is.

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Circular

LInear

Parabolic

Zig zag

Since selenium becomes conductor in light so it is.

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Photoconductor

Photocell

Thermistor

Photodiode

Which of the following material could be used for a high vacuum, high voltage tube.

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Thoriated tungsten

Tungsten

Copper

Cesium

What is the smalless total resistance using only a 6 ohm and 12 ohm resistors.

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2 Ohm

3 Ohm

4 Ohm

6 Ohm

Under which of the following conditions current in a circuit is wattles.

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When inductance in the circuit is zero

When resistance in the circuit is zero

When current is alternating

When resistance and inductance both are zero

Which of the following quantity is defined in terms of the rate of change of electric displacement field.

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Conventional current

Electronic current

Displacement current

Pulsating current

At series resonance in L-C-R circuit the impedance is equal to.

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Ohmic resistance

Inductive reactance

Capacitive reactance

Inductive reactance minus capacitive reactance

Charge carriers in thermocouples are.

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Anions

Cations

Electrons

Protons

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