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	If the two charges in Coulomb's law have double distance between them, then electric force	A. Becomes two-fold B. Becomes four-fold C. Remains the same D. None of these
2	The SI unit of conductivity is	A. ohm-m B. ohm^-1m^-1 C. ohm-m^-1 D. ohm^-1m
3	Electric potential of earth is taken to be zero because the earth is good	A. Semiconductor B. Conductor C. Insulator D. Dielectric
4	The resistance of a conductor does not depend on its	A. mass B. resistivity C. length D. cross-sectional area
5	The electric field due to an infinite long thin wire at a distance R varies as	A. 1/R B. 1/R² C. R D. R²
6	Which one of the following has larger value of relative permitivity E_rat room temperature?	A. Vaccum B. Air C. Glass D. Water
7	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. 25 B. 225 C. 625 D. 1250
8	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
9	An electric dipole is at the centre of a hollow sphere of radius r. The total normal electric flux through the sphere is (here Q is the charge and d is the distance between the two charges of the dipole)	A. Q/4πr² B. 2Q/4πr² C. Q.d D. Zero
10	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	A. 120 C B. 240 C C. 20 C D. 4 C

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

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

Coulomb's force between two point charges depends upon

The SI unit of conductivity is

If 2.2 kilowatt power is transmitted through a 10 ohm line at 22000 volt, the power loss in the form of heat will be

The resistivity of a substance depends upon the

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

The charge carriers in electrolyte are positive and negative

The SI unit of electric flux is

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

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

The capacitance of a parallel plate capacitor depends upon

Two point charges A and B separated by a distance R attract each other with a force of 12 x 10-3N. The force between A and B when the charges on them are doubled and distance is halved

The electric lines of force are

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

The conductivity of a superconductor is

Some charge is being given to a conductor. Then its potential

A medium of dielectric constant 'K' is introduced between the plates of parallel plate condenser. As a result its capcitance

An electric dipole is at the centre of a hollow sphere of radius r. The total normal electric flux through the sphere is (here Q is the charge and d is the distance between the two charges of the dipole)

The liquid which conduct current is known as

Equal charges are given to two spheres of different radii. The potential will

The resistance of an incandescent lamp is

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 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)

The charge carriers in gases are

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

The dot product of electric field intensity E and vector area A is called

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

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

If a 40 watt light bulb burns for 2 hours. how much heat is generated

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ECAT Physics Chapter 12 Important MCQ's

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Two point charges A and B separated by a distance R attract each other with a force of 12 x 10^-3N. The force between A and B when the charges on them are doubled and distance is halved