Question # 1

A conducting wire is drawn to double its length. Final resistivity of the material will be

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Double of the original one

Half of the original one

One fourth of the original one

Same as original one

10⁶electrons are moving through a wire per second, the current developed is

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1.6 x 10^-19

1 A

1.6 x 10^-15A

10⁶A

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 conventional current in a circuit is defined as " current which passes from a point at higher potential to a point at lower potential as if it represent a movement of

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negative charges

positive charges

protons

electrons

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

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

The relation V = IR represents

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Ampere law

Faraday's law

Ohm's law

Len's law

The resistance of an incandescent lamp is

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Smaller when switched on

Greater when switched off

The same whether it is switch off or switch on

Greater when switched on

When three identical bulbs of 60 watt, 200 volt rating are connected in series to a 200 volt supply, the power drawn by them will be

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180 watt

10 watt

20 watt

60 watt

The dot product of electric field intensity E and vector area A is called

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Electric potential

Electric flux

Electric field

Magnetic field

Electric generators which convert mechanical energy into

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solar energy

thermal energy

kinetic energy

electrical energy

A point charge Q is placed at the mid-point of a line joining two charges. 4q and q. if the net force on charge q is zero. then Q must be equal to

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-q

+q

-2q

+4q

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

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Semiconductor

Conductor

Insulator

Dielectric

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

Equal charges are given to two spheres of different radii. The potential will

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Be more on the smaller sphere

Be more on the bigger sphere

Be equal on both the sphere

Depend on the nature of the material of the sphere

The earth's potential is taken as

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Negative

Positive

Zero

Infinite

One electron volt is equal to

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1.6 x 1019eV

6.25 x 1018 eV

1.6 x 1018 eV

6.25 x 1019eV

In a voltmeter the conduction takes place due to

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Electrons only

Holes only

Electrons and holes

Electrons and ions

The colour sequence in a carbon resistor in red, brown, orange and silver. The resistance of the resistor is

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21 x 10³+ 10%

23 x 10¹+ 10%

21 x 10³+ 5%

12 x 10³+ 5%

If electric and gravitational force on an electron in a uniform electric field will be

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E=mg/q

E=q/mg

E=,g/q

E=qg/m

A (100 W , 200 W) bulb is connected to a 160 V power supply. The power consumption would be

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64 W

80 W

100 W

125 W

Two point charges A and B separated by a distance R attract each other with a force of 12 x 10^-3N. The force between A and B when the charges on them are doubled and distance is halved

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1.92 N

19.2 N

12 N

0.192 N

Ohm established a relation between

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voltage and resistance

voltage and charge

voltage and current

voltage resistance and charge

Ohm is the unit of

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current

capacitance

energy

resistance

The liquid which conduct current is known as

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heating effect

chemical energy

electrolyte

ohm's law

A condenser of capacity 50μF is charged to 10 V.The energy stored is

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1.25 x 10^-3J

3.75 x 10^-3J

2.5 x 10^-3J

5 x 10^-3J

Heating effect caused by an electric circuit is written

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H = I²Rt

H = I²R

H = IR²t

H = IR²

The capacitance of a parallel plate capacitor depends upon

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Area of the plates

Separation between the plates

Medium between the plates

All of the above

The SI unit of capacitance is

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Farad

Henry

Ohm

Volt

Capacitance of two or more capacitors

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Increases in series combination

Increases in parallel combination

Remains unchanged

None of the above

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