Question # 1

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

Two point charge +3μC and +8μC repel each other with a force of 40 N. If a charge of -5μC is added to each of them, then the force between then will become

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-10 N

+10 N

+20 N

-20 N

In a Milikian's oil drop experiment the charge on an oil drop is calculated to be 6.35 x 10^-19C. The number of excess electrons on the drop is

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3.9

4

4.2

6

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5μF

10μF

3μF

6μF

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

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Copper

Al

Diode

None

The unit of conductance is

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ohm

meter

mho

ohm-meter

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

The resistance of a conductor does not depend on its

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mass

resistivity

length

cross-sectional area

Ohm established a relation between

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voltage and resistance

voltage and charge

voltage and current

voltage resistance and charge

When three identical bulbs of 60 watt, 200 volt rating are connected in series to a 200 volt supply, the power drawn by them will be

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180 watt

10 watt

20 watt

60 watt

Ohm's law states that

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The current through a resistor is directly proportional to the applied voltage

The voltage across a resistor is directly proportional to the current passing through it

Resistance is the constant of proportionality between the voltage and current

all of these

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

The capacity of a parallel plat capacitor depends on the

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Type to metal used

Thickness of plates

Potential applied across the plates

Separation between the plates

If we plot graph between potential difference (V) and current (I) obeying ohm's law, it will give us

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parabola

straight line

hyper bola

ellipse

The dot product of electric field intensity E and vector area A is called

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Electric potential

Electric flux

Electric field

Magnetic field

A closed surface contains two equal and opposite charges. The net electric flux from the surface will be

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Negative

Positive

Infinite

Zero

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

Resistor is a device which convert electric energy to

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Heat energy

Chemical energy

Elastic energy

All of the above

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

Calculate the amount of charge flowing in 2 minutes in a wire of resistance 10Ωwhen a potential difference of 20 V is applied between its ends

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120 C

240 C

20 C

4 C

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

Which one of the following causes production of heat when current is set up in a wire?

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Fall of electrons from higher orbits to lower orbits

Inter-atomic collisions

Inter-electron collisions

Collisions of conduction electron with atoms

The unit of resistivity is

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ohm

ohm-m²

ohm-meter

ohm-m^-1

The force between two chares 0.06 m apart is 5 N. If each charge is moved towards the other by 0.01 m, then the force between them will become

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7.20 N

11.25 N

22.50 N

45.00

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

Which one of the following has larger value of relative permitivity E_rat room temperature?

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Vaccum

Air

Glass

Water

A 60 W bulb operates on 220 V supply. The current flowing through the bulb is

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11/3 A

3 A

3/11 A

6

The electric field intensity at a point due to a point charge

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Falls off inversely as the distance

Falls off inversely as the square of distance

Remains unchanged with distance

Increase directly as square of distance

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

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