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 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
2	Physicist George Simon ohm was a	A. German physical B. French physicist C. Chinese physicist D. Russian physicist
3	Which of the following does not obey ohm's law?	A. Copper B. Al C. Diode D. None
4	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
5	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
6	In case of a parallel plate capacitor if the plate separation is doubled and plate area is halved, the capacitance becomes	A. Four-fold B. One-half C. One-fourth D. Zero
7	Thermocouple is an arrangement of two different metals	A. To convert heat energy in to electrical energy B. To produce more heat C. To convert heat energy into chemical energy D. To convert electric energy in to heat energy
8	If a charged spherical conductor of radius 10 cm has potential V at a point distance 5 cm from its centre, then the potential at a point distance 15 cm from the centre will be	A. 1/3 V B. 2/3 V C. 3/2 V D. 3V
9	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
10	In RC series circuit the time during which the capacitor acquires 0.63 times the equilibrium charge is called	A. Time constant B. Decay constant C. None of these D. All of above

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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

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

The fractional change in resistance per kelvin is known as

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

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

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

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

The unit of resistance is

The electrode connected with the positive terminal of the current source is called

The electric flux from a closed surface

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

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

The liquid which conduct current is known as

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

Electron volt is the unit of.

A condenser of capacity 50μF is charged to 10 V.The energy stored is

A capacitor of capacity 1μF is charged to 1 KV. The energy stored in J

A wire is bent into a ring of radius R is given a charge q. The magnitude of the electrical field at the centre of the ring is

The earth's potential is taken as

The capacitance of a parallel plate capacitor depends upon

A proton is about 1840 times heavier than an electron. When it is accelerated by a potential difference of 1 KV, its kinetic energy will be

Electric flux is defined by the relation

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

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

When an electron is accelerated through a P.D. of an one volt, it will acquire energy equal to

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

The value of electrical constant of proportionality k is

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)

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

Thermocouple is an arrangement of two different metals

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ECAT Physics Chapter 12 Important MCQ's

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

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