Question # 1

Three resistance 500,500 and 50 ohms are connected in series across 555 volts mains. The current flowing through them will be

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0.52 A

1 mA

0.7 mA

1.4 A

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

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Copper

Al

Diode

None

The unit of resistivity is

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ohm

ohm-m²

ohm-meter

ohm-m^-1

Ohm is the unit of

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current

capacitance

energy

resistance

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 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 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

If 2.2 kilowatt power is transmitted through 1 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

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

The energy stored in a charge capacitor

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1/2CV²

1/2C²V

1/2C/V²

None of these

If two bulbs one of 60 W and other of 100 W are connected in parallel, then which one of the following will flow more?

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60 W bulb

100 W bulb

Both equally

None of these

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

The charge carriers in gases are

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electrons

ions

protons

ions and electrons

Solar cell converts sunlight directly into

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potential energy

thermal energy

mechanical energy

electrical energy

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

Resistance of a conductor is increased, the currant will

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Decrease

Increase

Remain the same

None of these

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