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	When an electron is accelerated through a P.D. of an one volt, it will acquire energy equal to	A. One joule B. One erg C. One electron volt D. None of these
2	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
3	Three resistance 500,500 and 50 ohms are connected in series across 555 volts mains. The current flowing through them will be	A. 0.52 A B. 1 mA C. 0.7 mA D. 1.4 A
4	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
5	The relation V = IR represents	A. Ampere law B. Faraday's law C. Ohm's law D. Len's law
6	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
7	Capacitance of two or more capacitors	A. Increases in series combination B. Increases in parallel combination C. Remains unchanged D. None of the above
8	The electric flux is linked with a surface will be maximum when	A. The surface is held parallel to the electric field B. The surface is held perpendicular to the electric field C. The surface makes an angle of 45° with the electric field D. All of the above
9	The charge per unit time through any cross-section of a conductor is called	A. capacitance B. electric power C. current D. potential difference
10	The nature of capacity of electrostatic capacitor depends on	A. Shape B. Size C. Thickness of plates D. Area

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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 earth's potential is taken as

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

The conductivity of a superconductor is

When a dielectric material is introduced between the plates of a charged condenser the electric field between the plates

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

The unit of conductance is

The fractional change in resistance per kelvin is known as

For two resistance wires joined in parallel, the resultant resistance is 6/5 ohm. When one of the resistance wire breaks, the effective resistance becomes 2 ohm. The resistance of the broken wire is

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

A wire of radius r has resistance R. If it is stretched to a wire of r/2 radius, then the resistance becomes

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

What is the current is a 2 x 106ohm resistor having a potential difference of 2 x 103volts?

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

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

Electron volt is the unit of

If two bulbs one of 60 W and other of 100 W are connected in parallel, then which one of the following will flow more?

Three resistors of resistance 2,3 and 6 ohms are connected in parallel, their equivalent resistance is

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

The SI unit of permitivity is

Taking the earth to be a spherical conductor of diameter 12.8 x 103km. Its capacity will be

The minimum charge on any object can not be less than

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

Resistance of a conductor is increased, the currant will

The SI unit of electric flux is

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

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

Surface density of charge is defined as

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

A 60 W bulb operates on 220 V supply. The current flowing through the bulb is

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ECAT Physics Chapter 12 Important MCQ's

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What is the current is a 2 x 10⁶ohm resistor having a potential difference of 2 x 10³volts?

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

Taking the earth to be a spherical conductor of diameter 12.8 x 10³km. Its capacity will be