Question # 1

A 100 W, 200 V bulb is connected to a 160 volts supply. The actual power consumption would be

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64 W

80 W

100 W

125 W

Coulomb's force between two point charges depends upon

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Magnitude of charges

Distance between them

Medium in which they are located

All of the above

In RC series circuit the time during which the capacitor acquires 0.63 times the equilibrium charge is called

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Time constant

Decay constant

None of these

All of above

One coulomb per second is equal to

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One volt

One ampere

One hom

One henry

A point charge A of charge +4μC and another B of charge -1μC are placed in air at a distance 1 m apart. Then the distance of the point on the line joining the charge B, where the resultant electric field is zero, is (in m)

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2

1

0.5

1.5

Thermocouple is an arrangement of two different metals

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To convert heat energy in to electrical energy

To produce more heat

To convert heat energy into chemical energy

To convert electric energy in to heat energy

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

A current of 1.6 A is passed through a solution of CuSO_{4. How many Cu}²⁺ions are liberated in one minute?

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3 x 10²⁰

3 x 10¹⁰

6 x 10²⁰

6 x 10¹⁰

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

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 cube of metal is given a positive charge Q. For the above system, which of the following statements is true?

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Electric potential at the surface of the cube is zero

Electric potential within the cube is zero

Electric filed is normal to the surface of the cube

Electric filed varies within the cube

Ohm is the unit of

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current

capacitance

energy

resistance

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

Resistance of a conductor depends upon

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the quantity of current passing through it

the voltage applied between its end

its dimensions, physical state and nature of its material

all of the above

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

When an electron is accelerated through a P.D. of an one volt, it will acquire energy equal to

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One joule

One erg

One electron volt

None of these

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