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 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
2	In a Milikian's oil drop experiment the charge on an oil drop is calculated to be 6.35 x 10^-19C. The number of excess electrons on the drop is	A. 3.9 B. 4 C. 4.2 D. 6
3	If the length of the conductor is double and its cross sectional area is halved, its conductance will	A. Increase four fold B. Become one-fourth C. Become one-half D. Remains unchanged
4	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
5	The electric lines of force are	A. Imaginary B. Physically existing everywhere C. Physically existing near the charge D. All of the above
6	Ohm is the unit of	A. current B. capacitance C. energy D. resistance
7	A parallel plate capacitor is first charged and then a dielectric slab is introduced between the plates. The quantity that remains unchanged is	A. Charge Q B. Potential V C. Capacity D. Energy U
8	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
9	The capacitance of a parallel plate capacitor depends upon	A. Area of the plates B. Separation between the plates C. Medium between the plates D. All of the above
10	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

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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 electric field will be uniform

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

In RC series circuit the time during which the capacitor acquires 0.63 times the equilibrium charge is called

106electrons are moving through a wire per second, the current developed is

A heater coil rated at (1000 W - 200 V) is connected to 110 volt line. What will be the power consumed?

The ohm's is defined as

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

The earth's potential is taken as

One joule is equal to

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

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

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

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

One moving a charge of 20 coulombs by 2 cm, 2 J of work is done, then the potential difference between the points is

The potential difference across the conductors should be maintained constant by connecting the ends of wire to the terminal of a device called a source of

If an electron of charge 'e' is accelerated through a potential difference V., it will acquire energy

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

The charge carriers in gases are

An electric charge at rest is

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

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

The speed of randomly moving electrons depends upon

A metal plate of thickness half the separation between the capacitor plates of capacitance C is inserted. The new capacitance is

A certain charge liberates 0.8 g of oxygen. The same charge will liberate. how many g of silver?

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

Capacitance of two or more capacitors

Ohm is the unit of

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

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

Resistance of a conductor is increased, the currant will

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ECAT Physics Chapter 12 Important MCQ's

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10⁶electrons are moving through a wire per second, the current developed is

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