Question # 1

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

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

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

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Copper

Al

Diode

None

The speed of randomly moving electrons depends upon

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pressure

volume

temperature

mass

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

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

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 value of electrical constant of proportionality k is

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9 x 10⁹Nm²C^-2

9 x 10^-9Nm²C^-2

9 x 10¹⁰Nm²C²

9.85 x 10^-12N^-1C^-2

A heater coil rated at (1000 W - 200 V) is connected to 110 volt line. What will be the power consumed?

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200 W

302.5

250 W

350 W

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

When a dielectric material is introduced between the plates of a charged condenser the electric field between the plates

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Decreases

Increases

No change

May increase or decresase

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

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

Electric generators which convert mechanical energy into

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solar energy

thermal energy

kinetic energy

electrical energy

A charge Q is divided into two parts q and Q - q and separated by a distance R. The force of repulsion between them will be maximum when

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q = Q/4

q = Q/2

q = !

None of these

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

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