ECAT Pre Engineering Physics Chapter 12 MCQ Test With Answer

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 relation between charge 'Q' and current 'I' is given by

Question # 2

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

Question # 3

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

Question # 4

An alpha particle is accelerated through a potential difference of 106volt. Its kinetic energy will be

Question # 5

The electric intensity outside the two oppositely charged parallel metal plates is

Question # 6

Electric potential of earth is taken to be zero because the earth is good

Question # 7

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 # 8

The current through a metallic conductor is due to the motion of

Question # 9

The thermistors are usually made of

Question # 10

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

Question # 11

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

Question # 12

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

Question # 13

The unit of conductance is

Question # 14

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

Question # 15

Physicist George Simon ohm was a

Question # 16

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

Question # 17

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

Question # 18

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

Question # 19

In RC series circuit the time during which the capacitor acquires 0.63 times the equilibrium charge is called

Question # 20

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

Question # 21

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

Question # 22

The electric field intensity at a point due to a point charge

Question # 23

The electric lines of force are

Question # 24

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 # 25

In bringing an electron towards another electron, electrostatic potential energy of system

Question # 26

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 # 27

The fractional change in resistance per kelvin is known as

Question # 28

An electric charge at rest is

Question # 29

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

Question # 30

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

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Sr.# Question Answer
1 The force of repulsion between two point charges is F, when these are at a distance 0.1 m apart. Now the point charges are replaced by sphere of radii 5 cm each having the same charge as that of the respective point charges. The distance between their centre is again kept 0.1 m ; then the force of repulsion will
A. Increase
B. Decrease
C. Remain F
D. Become 10F/9
2 One coulomb of charge is created by
A. 10 electrons
B. 1.6 x 10-19electrons
C. 6.25 x 1018electrons
D. 6.25 x 1021electrons
3 The relation between the charge Q of a parallel plate capacitor and the P.D between its plates is
A. Q=V/C
B. Q=C/V
C. Q=1/2CV
D. Q=CV
4 Electron volt is the unit of.
A. Potential difference
B. Energy
C. Resistance
D. Capacitance
5 The charge per unit time through any cross-section of a conductor is called
A. capacitance
B. electric power
C. current
D. potential difference
6 The relation V = IR represents
A. Ampere law
B. Faraday's law
C. Ohm's law
D. Len's law
7 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)
A. Q/4πr2
B. 2Q/4πr2
C. Q.d
D. Zero
8 Surface density of charge is defined as
A. Charge per unit volume
B. Charge per unit length
C. Charge per unit area
D. Charge per unit mass
9 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
10 Electric generators which convert mechanical energy into
A. solar energy
B. thermal energy
C. kinetic energy
D. electrical energy

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