Physics ECAT Pre Engineering Chapter 12 Electrostatics
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Question # 1
The SI unit of capacitance is
Question # 2
Heating effect caused by an electric circuit is written
Question # 3
A wire of radius r has resistance R. If it is stretched to a wire of r/2 radius, then the resistance becomes
Question # 4
A metal plate of thickness half the separation between the capacitor plates of capacitance C is inserted. The new capacitance is
Question # 5
A condenser of capacity 50μF is charged to 10 V.The energy stored is
Question # 6
The electrode connected with the positive terminal of the current source is called
Question # 7
The electric potential at the surface of an atomic nucleus (Z = 50) of radius 9.0 x 10-15 is
Question # 8
Three resistors of resistance 2,3 and 6 ohms are connected in parallel, their equivalent resistance is
Question # 9
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
Question # 10
Coulomb force, when any material medium is placed between two charges
Question # 11
An electric charge at rest is
Question # 12
In bringing an electron towards another electron, electrostatic potential energy of system
Question # 13
An electron of charge e coulomb passes through a potential difference of V volts its energy in joules will be
Question # 14
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
Question # 15
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
Question # 16
The charge carriers in gases are
Question # 17
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
Question # 18
In RC series circuit the time during which the capacitor acquires 0.63 times the equilibrium charge is called
Question # 19
The conductivity of a superconductor is
Question # 20
In case of a parallel plate capacitor if the plate separation is doubled and plate area is halved, the capacitance becomes
Question # 21
The earth's potential is taken as
Question # 22
Electron volt is the unit of.
Question # 23
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)
Question # 24
Electron volt is the unit of
Question # 25
The current through a metallic conductor is due to the motion of
Question # 26
A cube of metal is given a positive charge Q. For the above system, which of the following statements is true?
Question # 27
Ohm's law states that
Question # 28
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
Question # 29
If the length of the conductor is double and its cross sectional area is halved, its conductance will
Question # 30
A 10 F capacitor is charged to a potential difference of 50 V and is connected to another uncharged capacitor in parallel. Now the common potential difference becomes 20 volt.The capacitance of second capacitor is
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ECAT
Physics
Chapter 12
Important MCQ's
Sr.#
Question
Answer
1
106electrons are moving through a wire per second, the current developed is
A. 1.6 x 10-19
B. 1 A
C. 1.6 x 10-15 A
D. 106A
2
Current provided by a battery is maximum when
A. Internal resistance equal to external resistance
B. Internal resistance is greater than external resistance
C. Internal resistance is less then external resistance
D. None of these
3
A (100 W , 200 W) bulb is connected to a 160 V power supply. The power consumption would be
A. 64 W
B. 80 W
C. 100 W
D. 125 W
4
If two bulbs one of 60 W and other of 100 W are connected in parallel, then which one of the following will flow more?
A. 60 W bulb
B. 100 W bulb
C. Both equally
D. None of these
5
Ohm established a relation between
A. voltage and resistance
B. voltage and charge
C. voltage and current
D. voltage resistance and charge
6
In a voltmeter the conduction takes place due to
A. Electrons only
B. Holes only
C. Electrons and holes
D. Electrons and ions
7
When an electron is accelerated through a P.D. of an one volt, it will acquire energy equal to
A. One joule
B. One erg
C. One electron volt
D. None of these
8
Ohm is the unit of
A. current
B. capacitance
C. energy
D. resistance
9
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
10
Resistor is a device which convert electric energy to
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fun day
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