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	The unit of resistivity is	A. ohm B. ohm-m² C. ohm-meter D. ohm-m^-1
2	The resistance of an incandescent lamp is	A. Smaller when switched on B. Greater when switched off C. The same whether it is switch off or switch on D. Greater when switched on
3	The electric field intensity at a point due to a point charge	A. Falls off inversely as the distance B. Falls off inversely as the square of distance C. Remains unchanged with distance D. Increase directly as square of distance
4	Magnetic effect at a point caused due to flow a current depend upon the	A. Quantity of current B. Distance from current C. Both the quantity of current and distance from current element D. None of the all
5	In a charged capacitor the energy is stored in	A. Both in positive and negative charges B. Positive charges C. The edges of the capacitor plates D. The electric field between the plates
6	The energy stored in a charge capacitor	A. 1/2CV² B. 1/2C²V C. 1/2C/V² D. None of these
7	A point charge Q is placed at the mid-point of a line joining two charges. 4q and q. if the net force on charge q is zero. then Q must be equal to	A. -q B. +q C. -2q D. +4q
8	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	A. negative charges B. positive charges C. protons D. electrons
9	The SI unit of current is	A. watt B. coulomb C. volt D. ampere
10	The speed of randomly moving electrons depends upon	A. pressure B. volume C. temperature D. mass

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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

Capacitance of two or more capacitors

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

The energy required to charge a capacitor of 5μF by connecting D.C. source of 20 KV is

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

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

The capacity of a parallel plat capacitor depends on the

A charge Q is divided into two parts q and Q - q and separated by a distance R. The force of repulsion between them will be maximum when

The potential difference across each resistance in series combination is

Cause of heat production in a current carrying conductor is

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

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

One coulomb of charge is created by

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

A point charge A of charge +4μC and another B of charge -1μC are placed in air at a distance 1 m apart. Then the distance of the point on the line joining the charge B, where the resultant electric field is zero, is (in m)

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

Free electrons are

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

The relation V = IR represents

Electron volt is the unit of

The resistance of a conductor does not depend on its

The electric lines of force are

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

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

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

Two electric bulbs of 200 W and 100 W have same voltage. If R1and R2be their resistance respectively then

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

A sheet of aluminium foil of negligible thickness is introduced between the plates of a capacitor. The capacitance of the capacitor

Heating effect caused by an electric circuit is written

When an electron is accelerated through a P.D. of an one volt, it will acquire energy equal to

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

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ECAT Physics Chapter 12 Important MCQ's

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Two electric bulbs of 200 W and 100 W have same voltage. If R₁and R₂be their resistance respectively then