ECAT Pre Engineering Physics Chapter 12 MCQ Test With Answer

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ECAT Physics Chapter 12 Important MCQ's

Sr.#	Question	Answer
1	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?	A. Zero B. 5μC m^-2 C. 20μC m^-2 D. 8μC m^-2
2	In a building, there are 15 bulbs of 40 watts, 5 bulbs of 100 watts, 5 fans of 80 watts and a heater of 1 kilowatt. The voltage of the electric main is 220 volts. The minimum efficiency of the main fuse of the building will be	A. 0.4 A B. 11.4 A C. 9.8 A D. 10.6 A
3	If the distance between the plates of a parallel plate condenser of capacity 10μF is doubled then new capacity will be	A. 5μF B. 20μF C. 10μF D. 15μF
4	A parallel plate capacitor is first charged and then a dielectric slab is introduced between the plates. The quantity that remains unchanged is	A. Charge Q B. Potential V C. Capacity D. Energy U
5	Some charge is being given to a conductor. Then its potential	A. Is maximum at surface B. Is maximum at centre C. Is remain same throughout the conductor D. Is maximum somewhere between surface and centre
6	Which one of the following is the unit of electric field intensity	A. JC^-1 B. Vm^-1 C. Cm^-1 D. CJ^-1
7	The earth's potential is taken as	A. Negative B. Positive C. Zero D. Infinite
8	Free electrons are	A. tightly bound B. fixed C. loosely bound D. tightly fixed
9	A 10 F capacitor is charged to a potential difference of 50 V and is connected to another uncharged capacitor in parallel. Now the common potential difference becomes 20 volt.The capacitance of second capacitor is	A. 10μF B. 20μF C. 30μF D. 15μF
10	If the length of the conductor is double and its cross sectional area is halved, its conductance will	A. Increase four fold B. Become one-fourth C. Become one-half D. Remains unchanged

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ECAT Pre Engineering Physics Chapter 12 MCQ Test With Answer

MCQ's Test For Physics ECAT Pre Engineering Chapter 12 Electrostatics

Physics ECAT Pre Engineering Chapter 12 Electrostatics

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

The unit of conductance is

Three resistors of resistance R each are combined in various ways. Which of the following cannot be obtained?

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

The current through a metallic conductor is due to the motion of

One coulomb per second is equal to

Cause of heat production in a current carrying conductor is

The concept of field theory was put forward by

The electric lines of force are

The electric field will be uniform

Resistance of a conductor is increased, the currant will

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

Ohm established a relation between

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

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

The electric flux from a closed surface

The conventional current in a circuit is defined as " current which passes from a point at higher potential to a point at lower potential as if it represent a movement of

If the length of the conductor is double and its cross sectional area is halved, its conductance will

A heater coil rated at (1000 W - 200 V) is connected to 110 volt line. What will be the power consumed?

The speed of randomly moving electrons depends upon

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

The ratio of the gravitational force Fgto the electrostatic force Febetween two electrons at the same distance apart is approximately

Ohm is the unit of

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

In a building, there are 15 bulbs of 40 watts, 5 bulbs of 100 watts, 5 fans of 80 watts and a heater of 1 kilowatt. The voltage of the electric main is 220 volts. The minimum efficiency of the main fuse of the building will be

Physicist George Simon ohm was a

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

Ohm's law states that

Electron volt is the unit of

The conductivity of a superconductor is

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ECAT Physics Chapter 12 Important MCQ's

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