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

Question # 2

The conventional current in a circuit is defined as " current which passes from a point at higher potential to a point at lower potential as if it represent a movement of

Question # 3

Thermocouple is an arrangement of two different metals

Question # 4

The excess (equal in number) of electrons that must be placed on each of two small spheres spaced 3 cm apart, with force of repulsion between the spheres to be 10-19N, is

Question # 5

Electron volt is the unit of

Question # 6

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

Question # 7

In case of a parallel plate capacitor if the plate separation is doubled and plate area is halved, the capacitance becomes

Question # 8

Three resistors of resistance R each are combined in various ways. Which of the following cannot be obtained?

Question # 9

A ten ohm electric heater operates on a 110 V line. Calculate the rate at which it develops heat in watts

Question # 10

A cube of metal is given a positive charge Q. For the above system, which of the following statements is true?

Question # 11

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

Question # 12

A 50 volt battery is connected across 10 ohm resistor. The current is 4.5 A. The internal resistance of the battery is

Question # 13

Potentiometer is more sensitive than voltmeter, because

Question # 14

At any point on the right bisector of the line joining two equal and opposite charges

Question # 15

In a charged capacitor the energy is stored in

Question # 16

Two point charges A and B separated by a distance R attract each other with a force of 12 x 10-3N. The force between A and B when the charges on them are doubled and distance is halved

Question # 17

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

Question # 18

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 # 19

The charge carriers in electrolyte are positive and negative

Question # 20

The electric flux from a closed surface

Question # 21

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 # 22

The concept of field theory was put forward by

Question # 23

One joule is equal to

Question # 24

If the resistance of 2 ohm and 4 ohm are connected in parallel, the equivalent resistance will be

Question # 25

The relation between the charge Q of a parallel plate capacitor and the P.D between its plates is

Question # 26

A metal plate of thickness half the separation between the capacitor plates of capacitance C is inserted. The new capacitance is

Question # 27

The unit of resistance is

Question # 28

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

Question # 29

The charge carriers in gases are

Question # 30

A one microfarad capacitor of a TV is subjected to 4000 V potential difference. The energy stored in capacitor is

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ECAT Physics Chapter 12 Important MCQ's

Sr.# Question Answer
1 Some charge is being given to a conductor. Then its potential
A. Is maximum at surface
B. Is maximum at centre
C. Is remain same throughout the conductor
D. Is maximum somewhere between surface and centre
2 Electron volt is the unit of
A. Potential difference
B. Energy
C. Resistance
D. Capacitance
3 If the distance of separation between two chares is increased, the electrical potential energy of the system will
A. Increase
B. Decrease
C. May increase or decrease
D. Remain the same
4 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
5 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
A. Zero
B. 10Ω
C. 1Ω
D. 0.10Ω
6 In Pakistan electricity is supplied for domestic use at 220 V, it is supplied at 110 V in USA. If the resistance of a 60 W bulb for use in Pakistan is R, the resistance of a 60 W bulb for use in USA will be
A. 2 R
B. R/4
C. R/2
D. R
7 The unit of conductance is
A. ohm
B. meter
C. mho
D. ohm-meter
8 An alpha particle is accelerated through a potential difference of 106volt. Its kinetic energy will be
A. 1 MeV
B. 2 MeV
C. 4 MeV
D. 8 MeV
9 The SI unit of electric flux is
A. Weber
B. Nm2C-1
C. NmC-1
D. Nm-2C
10 The value of electrical constant of proportionality k is
A. 9 x 109Nm2C-2
B. 9 x 10-9Nm2C-2
C. 9 x 1010Nm2C2
D. 9.85 x 10-12N-1C-2

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