Question # 1

Ohm's law states that

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The current through a resistor is directly proportional to the applied voltage

The voltage across a resistor is directly proportional to the current passing through it

Resistance is the constant of proportionality between the voltage and current

all of these

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

A cube of metal is given a positive charge Q. For the above system, which of the following statements is true?

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Electric potential at the surface of the cube is zero

Electric potential within the cube is zero

Electric filed is normal to the surface of the cube

Electric filed varies within the cube

Consider a spherical shell of metal at he centre of which a positive point charge is kept

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The electric filed is zero outside the shell

The electric field is zero everywhere

The electric field is zero in the region inside the shell

The electric field is non-zero in both regions outside and inside the shell

The resistance of the given conductor can be increased by

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Increasing the area

Changing resistivity

Decreasing the length

None of the above because change does not matter because in any case the volume remains the same

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

Resistor is a device which convert electric energy to

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Heat energy

Chemical energy

Elastic energy

All of the above

The substances whose resistance decreases with the increase in temperature these substances have coefficient of

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positive temperature

negative temperature

absolute temperature

zero temperature

Specific resistance of a wire depends upon

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Length

Cross-section area

Mass

None

An electric dipole is at the centre of a hollow sphere of radius r. The total normal electric flux through the sphere is (here Q is the charge and d is the distance between the two charges of the dipole)

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Q/4πr²

2Q/4πr²

Q.d

Zero

If we increase the distance between two plates of the capacitor, the capacitance will

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Increase

Decrease

Remain same

First increase then decrease

A piece of fuse wire melts when a current of 15 ampere flows through it. With this current. If it dissipates 22.5 W, the resistance of fuse wire will be

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Zero

10Ω

1Ω

0.10Ω

The unit of conductance is

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ohm

meter

mho

ohm-meter

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

At any point on the right bisector of the line joining two equal and opposite charges

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At electric field is zero

The electric potential is zero

The electric potential decreases with increasing distance from the centre

The electric field is perpendicular to the line joining the charges

The nature of capacity of electrostatic capacitor depends on

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Shape

Size

Thickness of plates

Area

Solar cell converts sunlight directly into

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potential energy

thermal energy

mechanical energy

electrical energy

The unit of intensity of electric field is

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newton/coluomb

jule/coluomb

volt x metre

newton/metre

The statement "the electric force of repulsion or attraction between two point charges is directly proportional to the product of the charges and inversely proportional to square of the distance between them" refer to

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Coulomb's law

Gauss's law

Biot-Sarwat law

Ampere's law

Electric potential of earth is taken to be zero because the earth is good

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Semiconductor

Conductor

Insulator

Dielectric

The graphical representation of ohm's law is

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hyperbola

straight line

ellipse

parabola

A car battery has e.m.f 12 volt and internal resistance 5 x 10^-2ohm. If it draws 60 ampere current, the terminal voltage of the battery will be

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5 volt

3 volt

15 volt

9 volt

Ohm is the unit of

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current

capacitance

energy

resistance

The thermistors are usually made of

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Metals with low temperature coefficient of resistivity

Metals with high temperature coefficient of resistivity

Metal oxides with high temperature coefficient of resistivity

Semi conducting materials having low temperature coefficient of resistivity

A hollow insulated conduction sphere is given a positive charge of 10μC. What will be the electric field at the centre of the sphere if its radius is 2 meters?

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Zero

5μC m^-2

20μC m^-2

8μC m^-2

The relation between the charge Q of a parallel plate capacitor and the P.D between its plates is

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Q=V/C

Q=C/V

Q=1/2CV

Q=CV

A certain charge liberates 0.8 g of oxygen. The same charge will liberate. how many g of silver?

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108 g

10.8 g

0.8 g

108/0.8 g

Taking the earth to be a spherical conductor of diameter 12.8 x 10³km. Its capacity will be

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711μF

611μF

811μF

511μF

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

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5μF

10μF

3μF

6μF

A medium of dielectric constant 'K' is introduced between the plates of parallel plate condenser. As a result its capcitance

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Increase k time

Decreases k times

Decreases 1/K times

Remains unchanged

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