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 force between two chares 0.06 m apart is 5 N. If each charge is moved towards the other by 0.01 m, then the force between them will become

Question # 2

Calculate the amount of charge flowing in 2 minutes in a wire of resistance 10Ωwhen a potential difference of 20 V is applied between its ends

Question # 3

At ordinary temperature, an increase in temperature increases the conductivity of

Question # 4

A medium of dielectric constant 'K' is introduced between the plates of parallel plate condenser. As a result its capcitance

Question # 5

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

Question # 6

If the distance between the plates of a parallel plate condenser of capacity 10μF is doubled then new capacity will be

Question # 7

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 # 8

The electric field due to an infinite long thin wire at a distance R varies as

Question # 9

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 # 10

A piece of fuse wire melts when a current of 15 ampere flows through it. With this current. If it dissipates 22.5 W, the resistance of fuse wire will be

Question # 11

If the length of the conductor is double and its cross sectional area is halved, its conductance will

Question # 12

Electric flux is defined by the relation

Question # 13

Consider a spherical shell of metal at he centre of which a positive point charge is kept

Question # 14

The capacitance of a parallel plate capacitor depends upon

Question # 15

One coulomb per second is equal to

Question # 16

The thermistors are usually made of

Question # 17

The SI unit of permitivity is

Question # 18

The electric potential at the surface of an atomic nucleus (Z = 50) of radius 9.0 x 10-15 is

Question # 19

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

Question # 20

The energy required to charge a capacitor of 5μF by connecting D.C. source of 20 KV is

Question # 21

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

Question # 22

Coulomb force, when any material medium is placed between two charges

Question # 23

The concept of field theory was put forward by

Question # 24

Which one of the following has larger value of relative permitivity Erat room temperature?

Question # 25

The SI unit of capacitance is

Question # 26

The resistance of 20 cm long wire is 10Ω. When the length is changed to 40 cm. The new resistance is

Question # 27

If one volt is needed to cause a current of one ampere to flow in a conductor, its resistance is

Question # 28

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 # 29

If a 40 watt light bulb burns for 2 hours. how much heat is generated

Question # 30

The SI unit of electric field intensity is

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ECAT Physics Chapter 12 Important MCQ's

Sr.# Question Answer
1 The colour sequence in a carbon resistor in red, brown, orange and silver. The resistance of the resistor is
A. 21 x 103+ 10%
B. 23 x 101+ 10%
C. 21 x 103+ 5%
D. 12 x 103+ 5%
2 Thermocouple is an arrangement of two different metals
A. To convert heat energy in to electrical energy
B. To produce more heat
C. To convert heat energy into chemical energy
D. To convert electric energy in to heat energy
3 The electric field intensity at a point due to a point charge
A. Falls off inversely as the distance
B. Falls off inversely as the square of distance
C. Remains unchanged with distance
D. Increase directly as square of distance
4 The electric potential at the surface of an atomic nucleus (Z = 50) of radius 9.0 x 10-15 is
A. 9 x 105V
B. 9 V
C. 8 x 106V
D. 80 V
5 The unit of intensity of electric field is
A. newton/coluomb
B. jule/coluomb
C. volt x metre
D. newton/metre
6 The charge carriers in gases are
A. electrons
B. ions
C. protons
D. ions and electrons
7 One electron volt is equal to
A. 1.6 x 1019eV
B. 6.25 x 1018 eV
C. 1.6 x 1018 eV
D. 6.25 x 1019eV
8 The SI unit of electric flux is
A. Weber
B. Nm2C-1
C. NmC-1
D. Nm-2C
9 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
A. 10μF
B. 20μF
C. 30μF
D. 15μF
10 Three resistors of resistance R each are combined in various ways. Which of the following cannot be obtained?
A. 3RΩ
B. 2R/4Ω
C. R/3Ω
D. 2R/3Ω

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