Question # 1

The charge carriers in electrolyte are positive and negative

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protons

electrons

ions

none of these

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 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

The potential difference across each resistance in series combination is

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same

different

zero

none of these

The electric field intensity at a point due to a point charge

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Falls off inversely as the distance

Falls off inversely as the square of distance

Remains unchanged with distance

Increase directly as square of distance

The electric field due to an infinite long thin wire at a distance R varies as

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1/R

1/R²

R

R²

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

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Infinite

Positive

Zero

Negative

Resistance of a conductor is increased, the currant will

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Decrease

Increase

Remain the same

None of these

The minimum charge on any object can not be less than

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1.6 x 10^-19C

3.2 x 10^-19C

1.0 C

4.8 x 10^-19C

One coulomb per second is equal to

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One volt

One ampere

One hom

One henry

Physicist George Simon ohm was a

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German physical

French physicist

Chinese physicist

Russian physicist

In Pakistan electricity is supplied for domestic use at 220 V, it is supplied at 110 V in USA. If the resistance of a 60 W bulb for use in Pakistan is R, the resistance of a 60 W bulb for use in USA will be

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2 R

R/4

R/2

R

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

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JC^-1

Vm^-1

Cm^-1

CJ^-1

Which one of the following causes production of heat when current is set up in a wire?

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Fall of electrons from higher orbits to lower orbits

Inter-atomic collisions

Inter-electron collisions

Collisions of conduction electron with atoms

A 10 F capacitor is charged to a potential difference of 50 V and is connected to another uncharged capacitor in parallel. Now the common potential difference becomes 20 volt.The capacitance of second capacitor is

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10μF

20μF

30μF

15μF

The SI unit of electric flux is

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Weber

Nm²C^-1

NmC^-1

Nm^-2C

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

What is the current is a 2 x 10⁶ohm resistor having a potential difference of 2 x 10³volts?

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10^-1A

10^-2A

10^-4A

1 mA

Three resistors of resistance 2,3 and 6 ohms are connected in parallel, their equivalent resistance is

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11.0 ohm

1.0 ohm

7.0 ohm

3.0 ohm

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

A capacitor of capacity 1μF is charged to 1 KV. The energy stored in J

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5

0.5

0.005

50

The ratio of the gravitational force F_gto the electrostatic force F_ebetween two electrons at the same distance apart is approximately

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9.8

24 x 10¹⁹

24 x 10⁴²

24 x 10^-44

Which of the following does not obey ohm's law?

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Copper

Al

Diode

None

In a voltmeter the conduction takes place due to

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Electrons only

Holes only

Electrons and holes

Electrons and ions

The unit of resistivity is

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ohm

ohm-m²

ohm-meter

ohm-m^-1

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

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

The conductivity of a superconductor is

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Infinite

Very large

Very small

Zero

If the distance of separation between two chares is increased, the electrical potential energy of the system will

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Increase

Decrease

May increase or decrease

Remain the same

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