Question # 1

The electric intensity at infinite distance from the point charge will be

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Infinite

Positive

Zero

Negative

Three resistors of resistance R each are combined in various ways. Which of the following cannot be obtained?

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3RΩ

2R/4Ω

R/3Ω

2R/3Ω

The electric lines of force are

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Imaginary

Physically existing everywhere

Physically existing near the charge

All of the above

If an electron of charge 'e' is accelerated through a potential difference V., it will acquire energy

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Ve

V/e

e/V

2Ve

A parallel plate capacitor is first charged and then a dielectric slab is introduced between the plates. The quantity that remains unchanged is

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Charge Q

Potential V

Capacity

Energy U

The capacity of a parallel plat capacitor depends on the

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Type to metal used

Thickness of plates

Potential applied across the plates

Separation between the plates

A point charge A of charge +4μC and another B of charge -1μC are placed in air at a distance 1 m apart. Then the distance of the point on the line joining the charge B, where the resultant electric field is zero, is (in m)

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2

1

0.5

1.5

When an electron is accelerated through a P.D. of an one volt, it will acquire energy equal to

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One joule

One erg

One electron volt

None of these

The ohm's is defined as

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1 ampere / 1 volts

1 coulomb / 1 volt

1 volt / 1 ampere

1 volt / 1 coulomb

Which one of the following is the unit of electric field intensity

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JC^-1

Vm^-1

Cm^-1

CJ^-1

If the length of the conductor is double and its cross sectional area is halved, its conductance will

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Increase four fold

Become one-fourth

Become one-half

Remains unchanged

The electric field will be uniform

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Near a positive point charge

Near a negative point charge

Between two oppositely charged parallel metal plates

None of above

Resistor is a device which convert electric energy to

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Heat energy

Chemical energy

Elastic energy

All of the above

An alpha particle is accelerated through a potential difference of 10⁶volt. Its kinetic energy will be

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1 MeV

2 MeV

4 MeV

8 MeV

In bringing an electron towards another electron, electrostatic potential energy of system

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Decreases

Increases

Remains uncharged

Becomes zero

The electric flux is linked with a surface will be maximum when

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The surface is held parallel to the electric field

The surface is held perpendicular to the electric field

The surface makes an angle of 45° with the electric field

All of the above

The SI unit of electric flux is

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Weber

Nm²C^-1

NmC^-1

Nm^-2C

The electric flux from a closed surface

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Is independent of the shape of the surface

Depends on the charge enclosed by the surface

Both a and b

None of the above

The value of electrical constant of proportionality k is

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9 x 10⁹Nm²C^-2

9 x 10^-9Nm²C^-2

9 x 10¹⁰Nm²C²

9.85 x 10^-12N^-1C^-2

The relation V = IR represents

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Ampere law

Faraday's law

Ohm's law

Len's law

The potential difference across each resistance in series combination is

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same

different

zero

none of these

A one microfarad capacitor of a TV is subjected to 4000 V potential difference. The energy stored in capacitor is

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8 J

16 J

4 x 10^-3J

2 x 10^-3J

The resistivity of a substance depends upon the

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length

mass

area

temperature

The liquid which conduct current is known as

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heating effect

chemical energy

electrolyte

ohm's law

The energy required to charge a capacitor of 5μF by connecting D.C. source of 20 KV is

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10 KJ

5 KJ

2 KJ

1 KJ

An electric charge at rest is

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Only an electric field

Only a magnetic field

Both electric and magnetic fields

None of the above

The nature of capacity of electrostatic capacitor depends on

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Shape

Size

Thickness of plates

Area

The fractional change in resistance per kelvin is known as

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temperature coefficient

resistance coefficient

super temperature

critical temperature

Thermocouple is an arrangement of two different metals

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To convert heat energy in to electrical energy

To produce more heat

To convert heat energy into chemical energy

To convert electric energy in to heat energy

Cause of heat production in a current carrying conductor is

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Collisions of free electrons with one another

High drift speed of free electrons

Collisions of free electrons with atoms or ions of conductor

High resistance value

Electric generators which convert mechanical energy into

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solar energy

thermal energy

kinetic energy

electrical energy

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