Question # 1

The conventional current is the name given to current due to flow of

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Positrons

Positive charges

Negative charges

Both A and C

None of these

The effects of bends in a wire on its electrical resistance are:

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Zero

Much larger

Larger

Smaller

None of these

An important part of photocopier is:

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Toner cartridge

Deflection plates

Charging electrode

Print head

None of these

The number of field lines passing through unit area held perpendicular to the field lines represent:

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Flux in that region

Intensity of the field

Charge

Area of the region

None of these

In a metal, the valence electrons are:

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Attach to individual atoms

Not attached to individual atoms

Free to move within the metal

Both (A) and (C)

Both (B) and (C)

The surface destiny of charge is defined is:

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Charge per volume

Mass per volume

Charge per area

Mass per area

Both (B) and (C)

The earth’s potential and potential at infinity are taken:

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Equal

Zero

First is greater than the second

Second is greater than the first

Both (A) and (B)

The charge carries in the electrolyte are:

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Positive ions

Negative ions

Either (A) or (B)

Both (A) and (B)

Neither (A) nor (B)

A current of 1 ampere is passing through a conductor. The charge passing through it in half a minute s

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One coulomb

0.5 coulomb

30 coulombs

2 coulombs

None of these

Which of the following substances has got positive temperature coefficient of resistance?

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Carbon

Germanium

Silicon

Aluminium

None of these

The conventional current is the name given to current due to flow of:

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Positrons

Positive charges

Negative charges

Both (A) and (C)

None of these

The best conductor is:

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Silver

Copper

Aluminimum

Both B and C

None of them

The term drift velocity is used when the ends of a wire are:

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Connected to a laser source

Connected to a voltage source

Not connected to a voltage source

At different values of potential

Both (B) and (D)

When resistance of a current carrying wire increases due to rise in temperature, the drift velocity of electrons:

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Decreases

Increases

Remains the constant

Either of these

None of these

An eV is unit of:

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Potential

Energy

Work

Power

Both (B) and(C)

When a constant potential difference is applied across the conductor, the drift velocity of electrons:

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Increases

Decreases

Remains the constant

Either of these

None of these

A rheostat can e used:

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As variable resistor

As potential divider

For varying the current

All of these

None of these

Thermistors are prepared under

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High pressure and low temperature

High pressure and high temperature

Low pressure and low temperature

Low pressure and high temprature

None of these

An example of photoconductor is:

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Boron

Carbon

Iron

Aluminum

Selenium

When two spherical conducting balls at different potentials are joined by a metallic wire, after some time:

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Both the conductors are at the same potential

Potential difference across the conductors remain constant

Potential difference across the conductors becomes zero

Both (A) and (B)

Both (A) and (C)

The obvious effect/s of current is/are:

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Heating effect

Magnetic effect

Chemical effect

Both (C) and (B)

All of these

The passage of current is accompanied by a magnetic field in the surrounding space:

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Always accompanied

Sometimes accompanied

Never accompanied

Any of above

None of these

While finding the electric intensity at a point between two oppositely charged parallel plates, the Gaussian surface is taken in the form of a hollow:

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Cylinder

Box

Sphere

Circle

Rectangle

In case of two identical charges placed certain distance apart, the electric field lines are:

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Straight lines

Sine curves

Curved

Both (A) and (B)

None of these

An important part of inkjet printer is:

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Toner

Drum

Deflection plates

Heated roles

None of these

The strength of magnetic field at certain points around a wire depends upon:

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Value of current passing

Distance from the current element

Color of the material

Both (A) and (B)

Both (B) and (C)

The current that flows through the coil of a motor causes

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Its shaft to revolve

Its brushes to rotate

Motor to move

Its shaft to rotate

None of these

Heating effect of current utilized in:

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Electric motor

Electric toaster

Electroplating

Electric kettle

Both (B) and (D)

Xerography means:

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Dry writing

Wet writing

Poor writing

Excellent writing

Both (A) and (B)

Most practical applications of electricity involve

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Charges at rest

Charges in motion

Electrons at rest

Atoms in motion

Molecules in motion

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