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

In a Milikian's oil drop experiment the charge on an oil drop is calculated to be 6.35 x 10-19C. The number of excess electrons on the drop is

Question # 2

Two electric bulbs of 200 W and 100 W have same voltage. If R1and R2be their resistance respectively then

Question # 3

Resistor is a device which convert electric energy to

Question # 4

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

Question # 5

Potentiometer is more sensitive than voltmeter, because

Question # 6

A point charge Q is placed at the mid-point of a line joining two charges. 4q and q. if the net force on charge q is zero. then Q must be equal to

Question # 7

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

Question # 8

Electron volt is the unit of

Question # 9

Ohm established a relation between

Question # 10

The conductivity of a superconductor is

Question # 11

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 # 12

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 # 13

Three resistors of resistance 2,3 and 6 ohms are connected in parallel, their equivalent resistance is

Question # 14

The fractional change in resistance per kelvin is known as

Question # 15

The electric intensity at infinite distance from the point charge will be

Question # 16

Specific resistance of a wire depends upon

Question # 17

Some charge is being given to a conductor. Then its potential

Question # 18

A sheet of aluminium foil of negligible thickness is introduced between the plates of a capacitor. The capacitance of the capacitor

Question # 19

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

Question # 20

Taking the earth to be a spherical conductor of diameter 12.8 x 103km. Its capacity will be

Question # 21

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

Question # 22

The SI unit of current is

Question # 23

The material in the form of wire or rod or plate which leads the current into or cut of the electrolyte is known as

Question # 24

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

Question # 25

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

Question # 26

Which of the following does not obey ohm's law?

Question # 27

Solar cell converts sunlight directly into

Question # 28

The energy stored in a charge capacitor

Question # 29

The charge carriers in electrolyte are positive and negative

Question # 30

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

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ECAT Physics Chapter 12 Important MCQ's

Sr.# Question Answer
1 The electric flux is linked with a surface will be maximum when
A. The surface is held parallel to the electric field
B. The surface is held perpendicular to the electric field
C. The surface makes an angle of 45° with the electric field
D. All of the above
2 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
3 Electric potential of earth is taken to be zero because the earth is good
A. Semiconductor
B. Conductor
C. Insulator
D. Dielectric
4 The SI unit of capacitance is
A. Farad
B. Henry
C. Ohm
D. Volt
5 An electron of charge e coulomb passes through a potential difference of V volts its energy in joules will be
A. V/e
B. eV
C. e/V
D. V
6 For two resistance wires joined in parallel, the resultant resistance is 6/5 ohm. When one of the resistance wire breaks, the effective resistance becomes 2 ohm. The resistance of the broken wire is
A. 3/5 ohm
B. 2 ohm
C. 6/5 ohm
D. 3 ohm
7 The nature of capacity of electrostatic capacitor depends on
A. Shape
B. Size
C. Thickness of plates
D. Area
8 The energy required to charge a capacitor of 5μF by connecting D.C. source of 20 KV is
A. 10 KJ
B. 5 KJ
C. 2 KJ
D. 1 KJ
9 When a dielectric material is introduced between the plates of a charged condenser the electric field between the plates
A. Decreases
B. Increases
C. No change
D. May increase or decresase
10 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

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    fun day

    02 Mar 2023

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    18 Jun 2019

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    27 Apr 2019

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    15 Feb 2019

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