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

Specific resistance of a wire depends upon

Question # 3

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

Question # 4

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 # 5

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

Question # 6

The unit of conductance is

Question # 7

Ohm is the unit of

Question # 8

The earth's potential is taken as

Question # 9

Cause of heat production in a current carrying conductor is

Question # 10

The fractional change in resistance per kelvin is known as

Question # 11

Ohm established a relation between

Question # 12

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 # 13

The ohm's is defined as

Question # 14

If the distance of separation between two chares is increased, the electrical potential energy of the system will

Question # 15

The value of electrical constant of proportionality k is

Question # 16

The resistance of the given conductor can be increased by

Question # 17

Heating effect caused by an electric circuit is written

Question # 18

The powers of tow electric bulbs are 100 W and 200 W. Both of them are joined with 220 V mains. The ratio of resistances of their filaments will be

Question # 19

Taking the earth to be a spherical conductor of diameter 12.8 x 103km. Its capacity will be

Question # 20

The electric flux from a closed surface

Question # 21

The thermistors are usually made of

Question # 22

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

Question # 23

Capacitance of two or more capacitors

Question # 24

The dot product of electric field intensity E and vector area A is called

Question # 25

The concept of field theory was put forward by

Question # 26

The SI unit of electric flux is

Question # 27

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 # 28

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

Question # 29

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

Question # 30

If electric and gravitational force on an electron in a uniform electric field will be

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ECAT Physics Chapter 12 Important MCQ's

Sr.# Question Answer
1 The capacity of a parallel plat capacitor depends on the
A. Type to metal used
B. Thickness of plates
C. Potential applied across the plates
D. Separation between the plates
2 Three resistance 500,500 and 50 ohms are connected in series across 555 volts mains. The current flowing through them will be
A. 0.52 A
B. 1 mA
C. 0.7 mA
D. 1.4 A
3 Cause of heat production in a current carrying conductor is
A. Collisions of free electrons with one another
B. High drift speed of free electrons
C. Collisions of free electrons with atoms or ions of conductor
D. High resistance value
4
Question Image
A. 5μF
B. 10μF
C. 3μF
D. 6μF
5 In a charged capacitor the energy is stored in
A. Both in positive and negative charges
B. Positive charges
C. The edges of the capacitor plates
D. The electric field between the plates
6 A cube of metal is given a positive charge Q. For the above system, which of the following statements is true?
A. Electric potential at the surface of the cube is zero
B. Electric potential within the cube is zero
C. Electric filed is normal to the surface of the cube
D. Electric filed varies within the cube
7 Electric flux is defined by the relation
A. E.A.
B. E x A
C. E/A
D. none of these
8 Ohm established a relation between
A. voltage and resistance
B. voltage and charge
C. voltage and current
D. voltage resistance and charge
9 The resistivity of a substance depends upon the
A. length
B. mass
C. area
D. temperature
10 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

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