Question # 1

The material in the form of wire or rod or plate which leads the current into or cut of the electrolyte is known as

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voltmeters

resistance

electrode

current

Potentiometer is more sensitive than voltmeter, because

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Voltmeter has a very high resistance

Voltmeter has a very low resistance

Potentiometer does not draw any current from a source of unknown potential difference

Potentiometer is sensitive

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

A ten ohm electric heater operates on a 110 V line. Calculate the rate at which it develops heat in watts

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1310 W

670 W

810 W

1210 W

The SI unit of permitivity is

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Nm²C²

N^-1m^-2C²

NmC²

Nm²C^-1

The earth's potential is taken as

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Negative

Positive

Zero

Infinite

Three resistors of resistance R each are combined in various ways. Which of the following cannot be obtained?

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3RΩ

2R/4Ω

R/3Ω

2R/3Ω

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

An alpha particle is accelerated through a potential difference of 10⁶volt. Its kinetic energy will be

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1 MeV

2 MeV

4 MeV

8 MeV

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

The electric lines of force are

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Imaginary

Physically existing everywhere

Physically existing near the charge

All of the above

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%

Surface density of charge is defined as

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Charge per unit volume

Charge per unit length

Charge per unit area

Charge per unit mass

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

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

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

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