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

00:00
Question # 1

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

Question # 2

Resistance of a conductor is increased, the currant will

Question # 3

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

Question # 4

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

Question # 5

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

Question # 6

A hollow insulated conduction sphere is given a positive charge of 10μC. What will be the electric field at the centre of the sphere if its radius is 2 meters?

Question # 7

Resistor is a device which convert electric energy to

Question # 8

The unit of resistivity is

Question # 9

The concept of field theory was put forward by

Question # 10

When three identical bulbs of 60 watt, 200 volt rating are connected in series to a 200 volt supply, the power drawn by them will be

Question # 11

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 # 12

A capacitor of capacity 1μF is charged to 1 KV. The energy stored in J

Question # 13

Physicist George Simon ohm was a

Question # 14

The conductivity of a superconductor is

Question # 15

Coulomb's force between two point charges depends upon

Question # 16

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 # 17

Solar cell converts sunlight directly into

Question # 18

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

Question # 19

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

Question # 20

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 # 21

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 # 22

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 # 23

The colour sequence in a carbon resistor in red, brown, orange and silver. The resistance of the resistor is

Question # 24

In a charged capacitor the energy is stored in

Question # 25

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

Question # 26

Magnetic effect at a point caused due to flow a current depend upon the

Question # 27

What is the current is a 2 x 106ohm resistor having a potential difference of 2 x 103volts?

Question # 28

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

Question # 29

A 60 W bulb operates on 220 V supply. The current flowing through the bulb is

Question # 30

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

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ECAT Physics Chapter 12 Important MCQ's

Sr.# Question Answer
1 If we increase the distance between two plates of the capacitor, the capacitance will
A. Increase
B. Decrease
C. Remain same
D. First increase then decrease
2 The substances whose resistance decreases with the increase in temperature these substances have coefficient of
A. positive temperature
B. negative temperature
C. absolute temperature
D. zero temperature
3 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
4 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
A. Coulomb's law
B. Gauss's law
C. Biot-Sarwat law
D. Ampere's law
5 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
A. 5 volt
B. 3 volt
C. 15 volt
D. 9 volt
6 A wire of radius r has resistance R. If it is stretched to a wire of r/2 radius, then the resistance becomes
A. 2R
B. 4R
C. 16R
D. Zero
7 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
A. 1.92 N
B. 19.2 N
C. 12 N
D. 0.192 N
8 The liquid which conduct current is known as
A. heating effect
B. chemical energy
C. electrolyte
D. ohm's law
9 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
A. 120 C
B. 240 C
C. 20 C
D. 4 C
10 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

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