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 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
2	Solar cell converts sunlight directly into	A. potential energy B. thermal energy C. mechanical energy D. electrical energy
3	The resistance of a conductor does not depend on its	A. mass B. resistivity C. length D. cross-sectional area
4	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
5	Which of the following does not obey ohm's law?	A. Copper B. Al C. Diode D. None
6	Heating effect caused by an electric circuit is written	A. H = I²Rt B. H = I²R C. H = IR²t D. H = IR²
7	The potential difference across the conductors should be maintained constant by connecting the ends of wire to the terminal of a device called a source of	A. power B. current C. resistance D. temperature
8	The value of electrical constant of proportionality k is	A. 9 x 10⁹Nm²C^-2 B. 9 x 10^-9Nm²C^-2 C. 9 x 10¹⁰Nm²C² D. 9.85 x 10^-12N^-1C^-2
9	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
10	A cube of metal is given a positive charge Q. For the above system, which of the following statements is true?	A. Electric potential at the surface of the cube is zero B. Electric potential within the cube is zero C. Electric filed is normal to the surface of the cube D. Electric filed varies within the cube

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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

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

Resistance of a conductor depends upon

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

Electric potential of earth is taken to be zero because the earth is good

A parallel plate capacitor is first charged and then a dielectric slab is introduced between the plates. The quantity that remains unchanged is

In case of a parallel plate capacitor if the plate separation is doubled and plate area is halved, the capacitance becomes

The electric intensity outside the two oppositely charged parallel metal plates is

The charge carriers in electrolyte are positive and negative

Resistance of a conductor is increased, the currant will

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

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

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

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 certain charge liberates 0.8 g of oxygen. The same charge will liberate. how many g of silver?

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

If an electron of charge 'e' is accelerated through a potential difference V., it will acquire energy

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

The SI unit of conductivity is

Electric generators which convert mechanical energy into

The excess (equal in number) of electrons that must be placed on each of two small spheres spaced 3 cm apart, with force of repulsion between the spheres to be 10-19N, is

Which one of the following causes production of heat when current is set up in a wire?

The capacitance of a parallel plate capacitor depends upon

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

Current provided by a battery is maximum when

Electron volt is the unit of.

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

An electron of charge e coulomb passes through a potential difference of V volts its energy in joules will be

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

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

Magnetic effect at a point caused due to flow a current depend upon the

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ECAT Physics Chapter 12 Important MCQ's

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The excess (equal in number) of electrons that must be placed on each of two small spheres spaced 3 cm apart, with force of repulsion between the spheres to be 10^-19N, is

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