Question # 1

The electric field will be uniform

Choose an answer

Near a positive point charge

Near a negative point charge

Between two oppositely charged parallel metal plates

None of above

A 50 volt battery is connected across 10 ohm resistor. The current is 4.5 A. The internal resistance of the battery is

Choose an answer

Zero

0.5Ω

1.1Ω

5.0Ω

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

Choose an answer

1.92 N

19.2 N

12 N

0.192 N

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

Choose an answer

Falls off inversely as the distance

Falls off inversely as the square of distance

Remains unchanged with distance

Increase directly as square of distance

The material in the form of wire or rod or plate which leads the current into or cut of the electrolyte is known as

Choose an answer

voltmeters

resistance

electrode

current

One electron volt is equal to

Choose an answer

1.6 x 1019eV

6.25 x 1018 eV

1.6 x 1018 eV

6.25 x 1019eV

A car battery has e.m.f 12 volt and internal resistance 5 x 10^-2ohm. If it draws 60 ampere current, the terminal voltage of the battery will be

Choose an answer

5 volt

3 volt

15 volt

9 volt

The energy stored in a charge capacitor

Choose an answer

1/2CV²

1/2C²V

1/2C/V²

None of these

The SI unit of permitivity is

Choose an answer

Nm²C²

N^-1m^-2C²

NmC²

Nm²C^-1

Taking the earth to be a spherical conductor of diameter 12.8 x 10³km. Its capacity will be

Choose an answer

711μF

611μF

811μF

511μF

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

Choose an answer

2 R

R/4

R/2

R

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

Choose an answer

-10 N

+10 N

+20 N

-20 N

Thermocouple is an arrangement of two different metals

Choose an answer

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

The relation between the charge Q of a parallel plate capacitor and the P.D between its plates is

Choose an answer

Q=V/C

Q=C/V

Q=1/2CV

Q=CV

An electric charge at rest is

Choose an answer

Only an electric field

Only a magnetic field

Both electric and magnetic fields

None of the above

A ten ohm electric heater operates on a 110 V line. Calculate the rate at which it develops heat in watts

Choose an answer

1310 W

670 W

810 W

1210 W

Coulomb's force between two point charges depends upon

Choose an answer

Magnitude of charges

Distance between them

Medium in which they are located

All of the above

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

Choose an answer

64 W

80 W

100 W

125 W

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

Choose an answer

10Ω

20Ω

30Ω

40Ω

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

Choose an answer

Negative

Positive

Infinite

Zero

Capacitance of two or more capacitors

Choose an answer

Increases in series combination

Increases in parallel combination

Remains unchanged

None of the above

Electric flux is defined by the relation

Choose an answer

E.A.

E x A

E/A

none of these

If one volt is needed to cause a current of one ampere to flow in a conductor, its resistance is

Choose an answer

one ohm

one joule

one volt

one ampere

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

Choose an answer

3.9

4

4.2

6

Three resistance 500,500 and 50 ohms are connected in series across 555 volts mains. The current flowing through them will be

Choose an answer

0.52 A

1 mA

0.7 mA

1.4 A

A proton is about 1840 times heavier than an electron. When it is accelerated by a potential difference of 1 KV, its kinetic energy will be

Choose an answer

1840 KeV

1/1840 KeV

1 KeV

920 KeV

A capacitor is charged with a battery and then it is disconnected. A slab of dielectric is now inserted between the plates, then

Choose an answer

The charge in the plates reduces and potential difference increase

Potential difference between the plates increase, stored energy decreases and charge remains the same

Potential difference between the plates decreases and charge remains unchanged

None of the above

A capacitor of capacity 1μF is charged to 1 KV. The energy stored in J

Choose an answer

5

0.5

0.005

50

Ohm's law states that

Choose an answer

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

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

Choose an answer

11/3 A

3 A

3/11 A

6

The liquid which conduct current is known as

Choose an answer

heating effect

chemical energy

electrolyte

ohm's law

More Classes

Other Links

Physics ECAT Pre Engineering Chapter 12 Electrostatics Online Test MCQs With Answers

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer