Question # 1

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

The force of repulsion between two point charges is F, when these are at a distance 0.1 m apart. Now the point charges are replaced by sphere of radii 5 cm each having the same charge as that of the respective point charges. The distance between their centre is again kept 0.1 m ; then the force of repulsion will

Choose an answer

Increase

Decrease

Remain F

Become 10F/9

The capacitance of a parallel plate capacitor depends upon

Choose an answer

Area of the plates

Separation between the plates

Medium between the plates

All of the above

Current provided by a battery is maximum when

Choose an answer

Internal resistance equal to external resistance

Internal resistance is greater than external resistance

Internal resistance is less then external resistance

None of these

If we increase the distance between two plates of the capacitor, the capacitance will

Choose an answer

Increase

Decrease

Remain same

First increase then decrease

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

Choose an answer

5

0.5

0.005

50

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

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 capacity of a parallel plat capacitor depends on the

Choose an answer

Type to metal used

Thickness of plates

Potential applied across the plates

Separation between the plates

The unit of resistivity is

Choose an answer

ohm

ohm-m²

ohm-meter

ohm-m^-1

The electric lines of force are

Choose an answer

Imaginary

Physically existing everywhere

Physically existing near the charge

All of the above

A charge of 0.1 c accelerated through a potential difference of 1000V acquires kinetic energy

Choose an answer

200 J

100 J

1000 J

400 J

At any point on the right bisector of the line joining two equal and opposite charges

Choose an answer

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

At ordinary temperature, an increase in temperature increases the conductivity of

Choose an answer

Conductor

Semiconductor

Insulator

Alloy

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

Choose an answer

7.20 N

11.25 N

22.50 N

45.00

The unit of conductance is

Choose an answer

ohm

meter

mho

ohm-meter

The SI unit of current is

Choose an answer

watt

coulomb

volt

ampere

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

Resistance of a conductor depends upon

Choose an answer

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

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

Choose an answer

They have the same potential

They have the same amount of charge

They have the same capacity

They have the same shape

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

Choose an answer

1 : 2

2 : 1

1 : 4

4 : 1

The statement "the electric force of repulsion or attraction between two point charges is directly proportional to the product of the charges and inversely proportional to square of the distance between them" refer to

Choose an answer

Coulomb's law

Gauss's law

Biot-Sarwat law

Ampere's law

Coulomb force, when any material medium is placed between two charges

Choose an answer

Increases

Decreases

Remain unchanged

None of these

Equal charges are given to two spheres of different radii. The potential will

Choose an answer

Be more on the smaller sphere

Be more on the bigger sphere

Be equal on both the sphere

Depend on the nature of the material of the sphere

Capacitance of two or more capacitors

Choose an answer

Increases in series combination

Increases in parallel combination

Remains unchanged

None of the above

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

Choose an answer

1.6 x 10^-19

1 A

1.6 x 10^-15A

10⁶A

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

Choose an answer

Becomes two-fold

Becomes four-fold

Remains the same

None of these

The ratio of the gravitational force F_gto the electrostatic force F_ebetween two electrons at the same distance apart is approximately

Choose an answer

9.8

24 x 10¹⁹

24 x 10⁴²

24 x 10^-44

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

Force acting upon a charged particle kept between the plates of a charged condenser if F. IF one of the plates of the condenser is removed, force acting on the same will become

Choose an answer

Zero

F/2

F

2F

The resistance of the given conductor can be increased by

Choose an answer

Increasing the area

Changing resistivity

Decreasing the length

None of the above because change does not matter because in any case the volume remains the same

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