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

Which of the following represents an electric current?

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C^-1

CS^-1

J.S^-1

dynes^-1

The SI unit of conductivity is

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ohm-m

ohm^-1m^-1

ohm-m^-1

ohm^-1m

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

Some charge is being given to a conductor. Then its potential

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Is maximum at surface

Is maximum at centre

Is remain same throughout the conductor

Is maximum somewhere between surface and centre

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

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

In Pakistan electricity is supplied for domestic use at 220 V, it is supplied at 110 V in USA. If the resistance of a 60 W bulb for use in Pakistan is R, the resistance of a 60 W bulb for use in USA will be

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2 R

R/4

R/2

R

10⁶electrons are moving through a wire per second, the current developed is

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1.6 x 10^-19

1 A

1.6 x 10^-15A

10⁶A

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

An electric charge at rest is

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Only an electric field

Only a magnetic field

Both electric and magnetic fields

None of the above

The concept of field theory was put forward by

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Franklin

Kepler

Oersted

Michael Faraday

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 one microfarad capacitor of a TV is subjected to 4000 V potential difference. The energy stored in capacitor is

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8 J

16 J

4 x 10^-3J

2 x 10^-3J

The unit of resistance is

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volt

ampere

ohm

coat

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

The thermistors are usually made of

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Metals with low temperature coefficient of resistivity

Metals with high temperature coefficient of resistivity

Metal oxides with high temperature coefficient of resistivity

Semi conducting materials having low temperature coefficient of resistivity

The minimum charge on any object can not be less than

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1.6 x 10^-19C

3.2 x 10^-19C

1.0 C

4.8 x 10^-19C

The electric potential at the surface of an atomic nucleus (Z = 50) of radius 9.0 x 10^-15is

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9 x 10⁵V

9 V

8 x 10⁶V

80 V

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

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

The unit of intensity of electric field is

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newton/coluomb

jule/coluomb

volt x metre

newton/metre

A metal plate of thickness half the separation between the capacitor plates of capacitance C is inserted. The new capacitance is

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C

C/2

Zero

2C

Consider a spherical shell of metal at he centre of which a positive point charge is kept

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The electric filed is zero outside the shell

The electric field is zero everywhere

The electric field is zero in the region inside the shell

The electric field is non-zero in both regions outside and inside the shell

The graphical representation of ohm's law is

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hyperbola

straight line

ellipse

parabola

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5μF

10μF

3μF

6μF

The unit of resistivity is

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ohm

ohm-m²

ohm-meter

ohm-m^-1

If the distance between the plates of a parallel plate condenser of capacity 10μF is doubled then new capacity will be

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5μF

20μF

10μF

15μF

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 value of electrical constant of proportionality k is

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9 x 10⁹Nm²C^-2

9 x 10^-9Nm²C^-2

9 x 10¹⁰Nm²C²

9.85 x 10^-12N^-1C^-2

The potential difference across each resistance in series combination is

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same

different

zero

none of these

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