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 substances whose resistance decreases with the increase in temperature these substances have coefficient of	A. positive temperature B. negative temperature C. absolute temperature D. zero temperature
2	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. Coulomb's law B. Gauss's law C. Biot-Sarwat law D. Ampere's law
3	If we plot graph between potential difference (V) and current (I) obeying ohm's law, it will give us	A. parabola B. straight line C. hyper bola D. ellipse
4	The conductivity of a superconductor is	A. Infinite B. Very large C. Very small D. Zero
5	The capacity of a parallel plat capacitor depends on the	A. Type to metal used B. Thickness of plates C. Potential applied across the plates D. Separation between the plates
6	Which one of the following is the unit of electric field intensity	A. JC^-1 B. Vm^-1 C. Cm^-1 D. CJ^-1
7	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. -q B. +q C. -2q D. +4q
8	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)	A. 2 B. 1 C. 0.5 D. 1.5
9	A 100 W, 200 V bulb is connected to a 160 volts supply. The actual power consumption would be	A. 64 W B. 80 W C. 100 W D. 125 W
10	In a building, there are 15 bulbs of 40 watts, 5 bulbs of 100 watts, 5 fans of 80 watts and a heater of 1 kilowatt. The voltage of the electric main is 220 volts. The minimum efficiency of the main fuse of the building will be	A. 0.4 A B. 11.4 A C. 9.8 A D. 10.6 A

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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 uniform resistance wire of Length L and diameter d has a resistance R. Another wire of same material has length, 4L and diameter 2d, the resistance will be

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

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

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

Battery is charged in motor cars, which is based on

The electric field due to an infinite long thin wire at a distance R varies as

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

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

Thermocouple is an arrangement of two different metals

Which of the following does not obey ohm's law?

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

The electric field intensity at a point due to a point charge

The resistance of an incandescent lamp is

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

Potentiometer is more sensitive than voltmeter, because

The energy stored in a charge capacitor

The resistance of the given conductor can be increased by

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

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

Electron volt is the unit of

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

A capacitor is charged with a battery and then it is disconnected. A slab of dielectric is now inserted between the plates, then

One joule is equal to

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

Magnetic effect at a point caused due to flow a current depend upon the

The unit of conductance is

The electric potential at the surface of an atomic nucleus (Z = 50) of radius 9.0 x 10-15 is

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

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ECAT Physics Chapter 12 Important MCQ's

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The electric potential at the surface of an atomic nucleus (Z = 50) of radius 9.0 x 10^-15is