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	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	A. 1.92 N B. 19.2 N C. 12 N D. 0.192 N
2	The SI unit of electric field intensity is	A. CN^-1 B. NC^-1or Vm^-1 C. JC^-1 D. AV^-1
3	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	A. 1 : 2 B. 2 : 1 C. 1 : 4 D. 4 : 1
4	When a dielectric material is introduced between the plates of a charged condenser the electric field between the plates	A. Decreases B. Increases C. No change D. May increase or decresase
5	In a voltmeter the conduction takes place due to	A. Electrons only B. Holes only C. Electrons and holes D. Electrons and ions
6	The minimum charge on any object can not be less than	A. 1.6 x 10^-19C B. 3.2 x 10^-19C C. 1.0 C D. 4.8 x 10^-19C
7	The charge per unit time through any cross-section of a conductor is called	A. capacitance B. electric power C. current D. potential difference
8	A certain charge liberates 0.8 g of oxygen. The same charge will liberate. how many g of silver?	A. 108 g B. 10.8 g C. 0.8 g D. 108/0.8 g
9	A charge of 0.1 c accelerated through a potential difference of 1000V acquires kinetic energy	A. 200 J B. 100 J C. 1000 J D. 400 J
10	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

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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 the distance of separation between two chares is increased, the electrical potential energy of the system will

The conductivity of a superconductor is

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

A medium of dielectric constant 'K' is introduced between the plates of parallel plate condenser. As a result its capcitance

If the resistance of 2 ohm and 4 ohm are connected in parallel, the equivalent resistance will be

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

In bringing an electron towards another electron, electrostatic potential energy of system

A condenser of capacity 50μF is charged to 10 V.The energy stored is

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

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

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

The electric flux from a closed surface

The SI unit of capacitance is

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

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

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

Thermocouple is an arrangement of two different metals

The nature of capacity of electrostatic capacitor depends on

The relation between charge 'Q' and current 'I' is given by

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

One moving a charge of 20 coulombs by 2 cm, 2 J of work is done, then the potential difference between the points is

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

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

The concept of field theory was put forward by

Ohm established a relation between

The SI unit of current is

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

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

The liquid which conduct current is known as

An electric charge at rest is

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ECAT Physics Chapter 12 Important MCQ's

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