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	Which of the following does not obey ohm's law?	A. Copper B. Al C. Diode D. None
2	If a 40 watt light bulb burns for 2 hours. how much heat is generated	A. 288 x 10³J B. 288 x 10⁸J C. 288 x 10⁵J D. 288 x 10⁶J
3	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
4	The conductivity of a superconductor is	A. Infinite B. Very large C. Very small D. Zero
5	The charge carriers in electrolyte are positive and negative	A. protons B. electrons C. ions D. none of these
6	The resistance of a conductor does not depend on its	A. mass B. resistivity C. length D. cross-sectional area
7	When a dielectric material is introduced between the plates of a charged condenser the electric field between the plates	A. Decreases B. Increases C. No change D. May increase or decresase
8	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
9	Equal charges are given to two spheres of different radii. The potential will	A. Be more on the smaller sphere B. Be more on the bigger sphere C. Be equal on both the sphere D. Depend on the nature of the material of the sphere
10	Ohm is the unit of	A. current B. capacitance C. energy D. resistance

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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

If we plot graph between potential difference (V) and current (I) obeying ohm's law, it will give us

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

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

Current provided by a battery is maximum when

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 from a closed surface

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

Consider a spherical shell of metal at he centre of which a positive point charge is kept

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

If the two charges in Coulomb's law have double distance between them, then electric force

The ratio of the gravitational force Fgto the electrostatic force Febetween two electrons at the same distance apart is approximately

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

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

If the distance of separation between two chares is increased, the electrical potential energy of the system will

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

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

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

Potentiometer is more sensitive than voltmeter, because

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

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

If electric and gravitational force on an electron in a uniform electric field will be

The relation V = IR represents

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

Heating effect caused by an electric circuit is written

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

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

When three identical bulbs of 60 watt, 200 volt rating are connected in series to a 200 volt supply, the power drawn by them will be

One coulomb of charge is created by

At ordinary temperature, an increase in temperature increases the conductivity of

The graphical representation of ohm's law is

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ECAT Physics Chapter 12 Important MCQ's

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The ratio of the gravitational force F_gto the electrostatic force F_ebetween two electrons at the same distance apart is approximately

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