ECAT Pre Engineering Physics Chapter 12 MCQ Test With Answer

MCQ's Test For Physics ECAT Pre Engineering Chapter 12 Electrostatics

Try The MCQ's Test For Physics ECAT Pre Engineering Chapter 12 Electrostatics

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Physics ECAT Pre Engineering Chapter 12 Electrostatics

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Question # 1

The SI unit of conductivity is

Question # 2

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 # 3

The conductivity of a superconductor is

Question # 4

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

Question # 5

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

Question # 6

The SI unit of electric field intensity is

Question # 7

Coulomb's force between two point charges depends upon

Question # 8

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

Question # 9

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

Question # 10

The earth's potential is taken as

Question # 11

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

Question # 12

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)

Question # 13

The unit of intensity of electric field is

Question # 14

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

Question # 15

The relation V = IR represents

Question # 16

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 # 17

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 # 18

The graphical representation of ohm's law is

Question # 19

The unit of resistivity is

Question # 20

When a dielectric material is introduced between the plates of a charged condenser the electric field between the plates

Question # 21

Which one of the following is the unit of electric field intensity

Question # 22

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 # 23

In a voltmeter the conduction takes place due to

Question # 24

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

Question # 25

A hollow insulated conduction sphere is given a positive charge of 10μC. What will be the electric field at the centre of the sphere if its radius is 2 meters?

Question # 26

The unit of conductance is

Question # 27

An electron of charge e coulomb passes through a potential difference of V volts its energy in joules will be

Question # 28

Solar cell converts sunlight directly into

Question # 29

The thermistors are usually made of

Question # 30

Three resistance 500,500 and 50 ohms are connected in series across 555 volts mains. The current flowing through them will be

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ECAT Physics Chapter 12 Important MCQ's

Sr.# Question Answer
1 Electric generators which convert mechanical energy into
A. solar energy
B. thermal energy
C. kinetic energy
D. electrical energy
2 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
A. 2 R
B. R
C. R/2
D. R/4
3 The ratio of the gravitational force Fgto the electrostatic force Febetween two electrons at the same distance apart is approximately
A. 9.8
B. 24 x 1019
C. 24 x 1042
D. 24 x 10-44
4 The resistance of an incandescent lamp is
A. Smaller when switched on
B. Greater when switched off
C. The same whether it is switch off or switch on
D. Greater when switched on
5 If one volt is needed to cause a current of one ampere to flow in a conductor, its resistance is
A. one ohm
B. one joule
C. one volt
D. one ampere
6 An electron of charge e coulomb passes through a potential difference of V volts its energy in joules will be
A. V/e
B. eV
C. e/V
D. V
7 At ordinary temperature, an increase in temperature increases the conductivity of
A. Conductor
B. Semiconductor
C. Insulator
D. Alloy
8 The charge carriers in electrolyte are positive and negative
A. protons
B. electrons
C. ions
D. none of these
9 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
10 The resistance of a conductor does not depend on its
A. mass
B. resistivity
C. length
D. cross-sectional area

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