ECAT Pre General Science Physics Chapter 12 MCQ Test With Answer

MCQ's Test For ECAT Pre General Science Physics Chapter 12 Electrostatics

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ECAT Pre General Science Physics Chapter 12 Electrostatics

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Question # 1

One electron volt is equal to

Question # 2

The unit of intensity of electric field is

Question # 3

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

Question # 4

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

Question # 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

Question # 6

The minimum resistance that can be obtained by connecting 5 resistance of 1/4Ωeach is

Question # 7

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

Question # 8

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

Question # 9

Ohm is the unit of

Question # 10

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

Question # 11

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 # 12

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 # 13

Coulomb's force between two point charges depends upon

Question # 14

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

Question # 15

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

Question # 16

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

Question # 17

The charge carriers in gases are

Question # 18

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

Question # 19

Surface density of charge is defined as

Question # 20

The graphical representation of ohm's law is

Question # 21

If we plot graph between potential difference (V) and current (I) obeying ohm's law, it will give us

Question # 22

If an electron of charge 'e' is accelerated through a potential difference V., it will acquire energy

Question # 23

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

Question # 24

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

Question # 25

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

Question # 26

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 # 27

A charge Q is divided into two parts q and Q - q and separated by a distance R. The force of repulsion between them will be maximum when

Question # 28

The relation V = IR represents

Question # 29

A capacitor is charged with a battery and then it is disconnected. A slab of dielectric is now inserted between the plates, then

Question # 30

The SI unit of electric flux is

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ECAT Physics Chapter 12 Important MCQ's

Sr.# Question Answer
1 The material in the form of wire or rod or plate which leads the current into or cut of the electrolyte is known as
A. voltmeters
B. resistance
C. electrode
D. current
2 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%
3 The dot product of electric field intensity E and vector area A is called
A. Electric potential
B. Electric flux
C. Electric field
D. Magnetic field
4 Which of the following does not obey ohm's law?
A. Copper
B. Al
C. Diode
D. None
5 The potential difference across each resistance in series combination is
A. same
B. different
C. zero
D. none of these
6 One coulomb per second is equal to
A. One volt
B. One ampere
C. One hom
D. One henry
7 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
8 A condenser of capacity 50μF is charged to 10 V.The energy stored is
A. 1.25 x 10-3J
B. 3.75 x 10-3J
C. 2.5 x 10-3J
D. 5 x 10-3J
9 The minimum charge on any object can not be less than
A. 1.6 x 10-19C
B. 3.2 x 10-19C
C. 1.0 C
D. 4.8 x 10-19C
10 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
A. 1/3 V
B. 2/3 V
C. 3/2 V
D. 3V

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