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 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	A. Increase B. Decrease C. Remain F D. Become 10F/9
2	The resistivity of a substance depends upon the	A. length B. mass C. area D. temperature
3	A capacitor is charged with a battery and then it is disconnected. A slab of dielectric is now inserted between the plates, then	A. The charge in the plates reduces and potential difference increase B. Potential difference between the plates increase, stored energy decreases and charge remains the same C. Potential difference between the plates decreases and charge remains unchanged D. None of the above
4	The minimum resistance that can be obtained by connecting 5 resistance of 1/4Ωeach is	A. 4/5Ω B. 5/4Ω C. 20Ω D. 0.05 Ω
5	A ten ohm electric heater operates on a 110 V line. Calculate the rate at which it develops heat in watts	A. 1310 W B. 670 W C. 810 W D. 1210 W
6	What is the current is a 2 x 10⁶ohm resistor having a potential difference of 2 x 10³volts?	A. 10^-1A B. 10^-2A C. 10^-4A D. 1 mA
7	Two electric bulbs of 200 W and 100 W have same voltage. If R₁and R₂be their resistance respectively then	A. R₁= 2R₂ B. R₂= 2R₁ C. R₂=4R₁ D. R₁= 4R₂
8	The relation between charge 'Q' and current 'I' is given by	A. Q = I/t B. Q = It C. Q = I²t D. Q = I²/t
9	The unit of intensity of electric field is	A. newton/coluomb B. jule/coluomb C. volt x metre D. newton/metre
10	The electric lines of force are	A. Imaginary B. Physically existing everywhere C. Physically existing near the charge D. All of the above

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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

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

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

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

The resistivity of a substance depends upon the

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

Surface density of charge is defined as

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

Ohm established a relation between

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

The electric intensity at infinite distance from the point charge will be

One electron volt is equal to

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

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 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?

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

Heating effect caused by an electric circuit is written

Electron volt is the unit of

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

The resistance of a conductor does not depend on its

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

The substances whose resistance decreases with the increase in temperature these substances have coefficient of

Resistor is a device which convert electric energy to

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

The charge carriers in electrolyte are positive and negative

Ohm's law states that

The minimum resistance that can be obtained by connecting 5 resistance of 1/4Ωeach is

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

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

The SI unit of conductivity is

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