Question # 1

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

One electron volt is equal to

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1.6 x 1019eV

6.25 x 1018 eV

1.6 x 1018 eV

6.25 x 1019eV

If a charged spherical conductor of radius 10 cm has potential V at a point distance 5 cm from its centre, then the potential at a point distance 15 cm from the centre will be

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1/3 V

2/3 V

3/2 V

3V

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 speed of randomly moving electrons depends upon

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pressure

volume

temperature

mass

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 resistance of a conductor does not depend on its

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mass

resistivity

length

cross-sectional area

In case of a parallel plate capacitor if the plate separation is doubled and plate area is halved, the capacitance becomes

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Four-fold

One-half

One-fourth

Zero

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 electric field will be uniform

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Near a positive point charge

Near a negative point charge

Between two oppositely charged parallel metal plates

None of above

The SI unit of electric flux is

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Weber

Nm²C^-1

NmC^-1

Nm^-2C

The energy stored in a charge capacitor

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1/2CV²

1/2C²V

1/2C/V²

None of these

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

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Copper

Al

Diode

None

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

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

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 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

A uniform resistance wire of Length L and diameter d has a resistance R. Another wire of same material has length, 4L and diameter 2d, the resistance will be

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2 R

R

R/2

R/4

In a charged capacitor the energy is stored in

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Both in positive and negative charges

Positive charges

The edges of the capacitor plates

The electric field between the plates

If the two charges in Coulomb's law have double distance between them, then electric force

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Becomes two-fold

Becomes four-fold

Remains the same

None of these

Electron volt is the unit of.

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Potential difference

Energy

Resistance

Capacitance

One coulomb of charge is created by

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10 electrons

1.6 x 10^-19electrons

6.25 x 10¹⁸electrons

6.25 x 10²¹electrons

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

Two point charges A and B separated by a distance R attract each other with a force of 12 x 10^-3N. The force between A and B when the charges on them are doubled and distance is halved

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1.92 N

19.2 N

12 N

0.192 N

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 a 40 watt light bulb burns for 2 hours. how much heat is generated

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288 x 10³J

288 x 10⁸J

288 x 10⁵J

288 x 10⁶J

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 powers of tow electric bulbs are 100 W and 200 W. Both of them are joined with 220 V mains. The ratio of resistances of their filaments will be

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1 : 2

2 : 1

1 : 4

4 : 1

Two conductors having the same type of charges are connected by a conducting wire. There would not be any amount of charges on them if

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They have the same potential

They have the same amount of charge

They have the same capacity

They have the same shape

The excess (equal in number) of electrons that must be placed on each of two small spheres spaced 3 cm apart, with force of repulsion between the spheres to be 10^-19N, is

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25

225

625

1250

Specific resistance of a wire depends upon

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Length

Cross-section area

Mass

None

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