Question # 1

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%

At any point on the right bisector of the line joining two equal and opposite charges

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At electric field is zero

The electric potential is zero

The electric potential decreases with increasing distance from the centre

The electric field is perpendicular to the line joining the charges

Electric potential of earth is taken to be zero because the earth is good

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Semiconductor

Conductor

Insulator

Dielectric

The conductivity of a superconductor is

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Infinite

Very large

Very small

Zero

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

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

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

The SI unit of conductivity is

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ohm-m

ohm^-1m^-1

ohm-m^-1

ohm^-1m

The potential difference across the conductors should be maintained constant by connecting the ends of wire to the terminal of a device called a source of

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power

current

resistance

temperature

A medium of dielectric constant 'K' is introduced between the plates of parallel plate condenser. As a result its capcitance

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Increase k time

Decreases k times

Decreases 1/K times

Remains unchanged

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

A certain charge liberates 0.8 g of oxygen. The same charge will liberate. how many g of silver?

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108 g

10.8 g

0.8 g

108/0.8 g

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

The SI unit of electric field intensity is

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CN^-1

NC^-1or Vm^-1

JC^-1

AV^-1

Free electrons are

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tightly bound

fixed

loosely bound

tightly fixed

The resistance of 20 cm long wire is 10Ω. When the length is changed to 40 cm. The new resistance is

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10Ω

20Ω

30Ω

40Ω

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