Question # 1

In a building, there are 15 bulbs of 40 watts, 5 bulbs of 100 watts, 5 fans of 80 watts and a heater of 1 kilowatt. The voltage of the electric main is 220 volts. The minimum efficiency of the main fuse of the building will be

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0.4 A

11.4 A

9.8 A

10.6 A

The powers of tow electric bulbs are 100 W and 200 W. Both of them are joined with 220 V mains. The ratio of resistances of their filaments will be

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1 : 2

2 : 1

1 : 4

4 : 1

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

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

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Decreases

Increases

Remains uncharged

Becomes zero

The resistivity of a substance depends upon the

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length

mass

area

temperature

The charge carriers in electrolyte are positive and negative

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protons

electrons

ions

none of these

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 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

If 2.2 kilowatt power is transmitted through a 10 ohm line at 22000 volt, the power loss in the form of heat will be

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0.1 watt

1 watt

10 watt

100 watt

If the resistance of 2 ohm and 4 ohm are connected in parallel, the equivalent resistance will be

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6 ohm

4 ohm

zero ohm

1.33 ohm

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

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

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

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 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 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

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