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	An electron of charge e coulomb passes through a potential difference of V volts its energy in joules will be	A. V/e B. eV C. e/V D. V
2	Battery is charged in motor cars, which is based on	A. Chemical effect B. Magnetic effect C. Electric effect D. None
3	The graphical representation of ohm's law is	A. hyperbola B. straight line C. ellipse D. parabola
4	In bringing an electron towards another electron, electrostatic potential energy of system	A. Decreases B. Increases C. Remains uncharged D. Becomes zero
5	A piece of fuse wire melts when a current of 15 ampere flows through it. With this current. If it dissipates 22.5 W, the resistance of fuse wire will be	A. Zero B. 10Ω C. 1Ω D. 0.10Ω
6	Two point charge +3μC and +8μC repel each other with a force of 40 N. If a charge of -5μC is added to each of them, then the force between then will become	A. -10 N B. +10 N C. +20 N D. -20 N
7	One coulomb of charge is created by	A. 10 electrons B. 1.6 x 10^-19electrons C. 6.25 x 10¹⁸electrons D. 6.25 x 10²¹electrons
8	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
9	If the resistance of 2 ohm and 4 ohm are connected in parallel, the equivalent resistance will be	A. 6 ohm B. 4 ohm C. zero ohm D. 1.33 ohm
10	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. 10μF B. 20μF C. 30μF D. 15μF

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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 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

The relation between the charge Q of a parallel plate capacitor and the P.D between its plates is

The resistivity of a substance depends upon the

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

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

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

Coulomb's force between two point charges depends upon

The relation V = IR represents

Which of the following represents an electric current?

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

The electric flux is linked with a surface will be maximum when

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

The resistance of an incandescent lamp is

The value of electrical constant of proportionality k is

The electric flux from a closed surface

A conducting wire is drawn to double its length. Final resistivity of the material will be

One coulomb of charge is created by

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

A charge of 0.1 c accelerated through a potential difference of 1000V acquires kinetic energy

One joule is equal to

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

One electron volt is equal to

The capacitance of a parallel plate capacitor depends upon

Cause of heat production in a current carrying conductor is

The unit of resistance is

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

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

The charge per unit time through any cross-section of a conductor is called

Current provided by a battery is maximum when

In Pakistan electricity is supplied for domestic use at 220 V, it is supplied at 110 V in USA. If the resistance of a 60 W bulb for use in Pakistan is R, the resistance of a 60 W bulb for use in USA will be

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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

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