Question # 1

An ideal voltmeter has:

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Zero resistance

Small resistance

Large resistance

Infinite resistance

Both A and B

Gaussian surface is always:

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Rectangular

Spherical

Cylindrical

Box shape

Any of these

The value of resistivity is the least for:

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Copper

Aluminimum

Silver

Tungsten

Iron

Xerography means:

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Dry writing

Wet writing

Poor writing

Excellent writing

Both (A) and (B)

Flux through a closed surface of any shape and flux through the surface of a sphere drawn around a charge are:

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Different

Same

Such that it is greater in the first case

Such that it is greater in the second case

None of these

In case of metallic conductors, the charge carriers are

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Protons

Electrons

Antiprotons

Positrons

Both A and B

In a metal, the valence electrons are:

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Attached to individual atoms

Not attached to individual atoms

Free to move within the metal

Both A and B

Both A and C

The interior of a hollow charged metal sphere is a region which:

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Contain some magnitude of electric field

Is full of electric field lines

Is field-free region

Either (A) or (B)

None of these

The quantity having the same unit as that of emf is:

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Force

Energy

Potential

Current

Charge

The third band of the colour code:

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Gives the number of zeroes

Is decimal multiplier

Gives the resistance tolerance

Gives the third digit

Both (A) and (B)

The device which can convert heat energy into electrical energy is called:

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Thermistor

Thermometer

Thermostat

Thermocouple

Both (C) and (D)

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)

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

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)

The rate at which the free electrons pass through any section of a metallic wire from right to left is:

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Greater than the speed at which they pass from left to right

Less than the speed at which they pass from left to right

The same speed at which they pass from left to right

Any of above

None of them

An important part of photocopier is:

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Toner cartridge

Deflection plates

Charging electrode

Print head

None of these

The flux through a closed surface depends upon:

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Shape of geometry of the closed surface

Charge enclosed

Nature of the medium

Both (A) and (B)

Both (B) and (C)

A field free region is found:

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Near the outer surface of a hollow charged metal sphere

In the interior of solid metal uncharged sphere

In the interior of solid metal charged sphere

Both (A) and (B)

Both (A) and (C)

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

When certain area A is held parallel to the field lines, then:

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No lines cross this area

Maximum lines pass through this area

The number of lines are between zero and maximum

Both (A) and (B) correct

None of these

An electric field is generated along the wire when:

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Its resistance is very high

A constant potential is maintained across the wire

Net current through the wire is zero

A constant potential difference is maintained across the wire

Either (A) or (D)

Field lines are closer to each other in the region where the field is:

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Stronger

Weaker

Much weaker

Absent

None of these

Electric flux is:

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Cross product of two vector

Dot product of two vectors

A vector quantity

A scalar quantity

Both (B) and (D)

Selenium is:

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An insulator

A conductor

Insulator in the dark and becomes conductor when exposed to light

Conductor in the dark only

None of these

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

Electrostatics is the branch of physics which deals with the study of electro charges:

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At rest

At rest under the action of electric forces

In motion under the action of electric forces

In motion

At rest under the action of nuclear forces

Kirchhoff's first rule is also called:

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Loop rule

Thumb rule

Point rule

Right hand rule

None of these

As the current flow through the wire:

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It generates heat in the wire

It produces sound in the wire

Resistance of the wire decreases

Voltage across the ends is increased

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

Conversion of chemical energy to electrical energy can be achieved by:

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Primary cell

Secondary cell

Both (A) and (B)

Photovoltaic cell

Solar cell

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 shafts to rotate

None of these

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