Question # 1

An eV is unit of:

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Potential

Energy

Work

Power

Both (B) and(C)

In order to have a constant current through wire, the potential difference across its end should:

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Be zero

Be maintained constant

Goes on increasing

Go on decreasing

Both (A) and (B)

The emf is measured in:

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Newton

Volt

J/C

Both A and B

Both B and C

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

Certain charge +q is placed at the center of a sphere. At each of the sphere,The directions of electric intensity and vector area are:

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Same

Different

Opposite to each other

At 60º with each other

Both (B) and (C)

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

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)

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

The magnitude of chemical Effects depends upon:

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Nature of liquid

Quantity of Electricity passed through the liquid

Color of the liquid

Both (A) and (C)

Both (A) and (B)

SI unit of current describes the flow of charge at the rate of

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One ampere per second

One coulomb per second

One electron per second

6.25 x 10¹⁸electrons per second

Both B and D

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 example/s of non-electrical energy to electrical is/are:

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Chemical energy

Mechanical energy

Heat energy

Both (A) and (B)

All of these

In case of metallic conductors, the charge carriers are

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Protons

Electrons

Antiprotons

Positrons

Both A and B

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)

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 positive charge moving in one direction is equivalent in all external affects to a:

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Negative charge is moving in the same direction

Positive charge is moving in the opposite direction

Negative charge moving in the opposite direction

Positive charges moving in the same direction

None of these

Xerography means:

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Dry writing

Wet writing

Poor writing

Excellent writing

Both (A) and (B)

Most practical application of electricity involve

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Charges at the rest

Charges in the motion

Electrons at rest

Atoms in motion

Molecules in motion

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 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)

The charge carriers in an electrolyte are

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Positive ions

Negative ions

Either A or B

Both A and B

Neither A nor B

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

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

In case of metallic conductors, the charge carriers are

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Protons

Electrons

Antiprotons

Positrons

Both A and B

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)

Tick the correct statement:

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Both the potential and potential difference is scalars

Potential is a scalar but potential difference is a vector

Both are vectors

Potential is vector but potential difference is scalar

None of these

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

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 free electrons in metals:

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Are in random motion and their speed depends upon temperature

Move in particular direction

Move with speed of light

Move such that their speed does not depend on their temperature

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

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