Physics ECAT Pre Engineering Chapter 12 Electrostatics
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Question # 1
A medium of dielectric constant 'K' is introduced between the plates of parallel plate condenser. As a result its capcitance
Question # 2
Two conductors having the same type of charges are connected by a conducting wire. There would not be any amount of charges on them if
Question # 3
What is the current is a 2 x 106ohm resistor having a potential difference of 2 x 103volts?
Question # 4
Consider a spherical shell of metal at he centre of which a positive point charge is kept
Question # 5
The capacity of a parallel plat capacitor depends on the
Question # 6
Force acting upon a charged particle kept between the plates of a charged condenser if F. IF one of the plates of the condenser is removed, force acting on the same will become
Question # 7
106electrons are moving through a wire per second, the current developed is
Question # 8
Ohm's law states that
Question # 9
One moving a charge of 20 coulombs by 2 cm, 2 J of work is done, then the potential difference between the points is
Question # 10
The force of repulsion between two point charges is F, when these are at a distance 0.1 m apart. Now the point charges are replaced by sphere of radii 5 cm each having the same charge as that of the respective point charges. The distance between their centre is again kept 0.1 m ; then the force of repulsion will
Question # 11
The relation between the charge Q of a parallel plate capacitor and the P.D between its plates is
Question # 12
At ordinary temperature, an increase in temperature increases the conductivity of
Question # 13
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
Question # 14
Solar cell converts sunlight directly into
Question # 15
A certain charge liberates 0.8 g of oxygen. The same charge will liberate. how many g of silver?
Question # 16
Heating effect caused by an electric circuit is written
Question # 17
The material in the form of wire or rod or plate which leads the current into or cut of the electrolyte is known as
Question # 18
The SI unit of capacitance is
Question # 19
The ohm's is defined as
Question # 20
A heater coil rated at (1000 W - 200 V) is connected to 110 volt line. What will be the power consumed?
Question # 21
The resistivity of a substance depends upon the
Question # 22
Two point charge +3μCand+8μCrepel 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
Question # 23
Three resistors of resistance R each are combined in various ways. Which of the following cannot be obtained?
Question # 24
A conducting wire is drawn to double its length. Final resistivity of the material will be
Question # 25
A car battery has e.m.f 12 volt and internal resistance 5 x 10-2ohm. If it draws 60 ampere current, the terminal voltage of the battery will be
Question # 26
At any point on the right bisector of the line joining two equal and opposite charges
Question # 27
A 60 W bulb operates on 220 V supply. The current flowing through the bulb is
Question # 28
The electric flux from a closed surface
Question # 29
If the distance between the plates of a parallel plate condenser of capacity 10μF is doubled then new capacity will be
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ECAT
Physics
Chapter 12
Important MCQ's
Sr.#
Question
Answer
1
The SI unit of conductivity is
A. ohm-m
B. ohm-1m-1
C. ohm-m-1
D. ohm-1m
2
Three resistors of resistance 2,3 and 6 ohms are connected in parallel, their equivalent resistance is
A. 11.0 ohm
B. 1.0 ohm
C. 7.0 ohm
D. 3.0 ohm
3
Coulomb's force between two point charges depends upon
A. Magnitude of charges
B. Distance between them
C. Medium in which they are located
D. All of the above
4
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
5
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
6
A wire of radius r has resistance R. If it is stretched to a wire of r/2 radius, then the resistance becomes
A. 2R
B. 4R
C. 16R
D. Zero
7
A metal plate of thickness half the separation between the capacitor plates of capacitance C is inserted. The new capacitance is
A. C
B. C/2
C. Zero
D. 2C
8
The potential difference across each resistance in series combination is
A. same
B. different
C. zero
D. none of these
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
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?
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