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 energy stored in a charge capacitor

Question # 2

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 # 3

A proton is about 1840 times heavier than an electron. When it is accelerated by a potential difference of 1 KV, its kinetic energy will be

Question # 4

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

Question # 5

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

Question # 6

The resistance of the given conductor can be increased by

Question # 7

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

Question # 8

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

Question # 9

The energy required to charge a capacitor of 5μF by connecting D.C. source of 20 KV is

Question # 10

If two bulbs one of 60 W and other of 100 W are connected in parallel, then which one of the following will flow more?

Question # 11

The conductivity of a superconductor is

Question # 12

The minimum charge on any object can not be less than

Question # 13

Solar cell converts sunlight directly into

Question # 14

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 # 15

The unit of resistivity is

Question # 16

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

Question # 17

A certain charge liberates 0.8 g of oxygen. The same charge will liberate. how many g of silver?

Question # 18

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 # 19

The electric flux is linked with a surface will be maximum when

Question # 20

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

Question # 21

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

Question # 22

Ohm is the unit of

Question # 23

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)

Question # 24

A conducting wire is drawn to double its length. Final resistivity of the material will be

Question # 25

The charge per unit time through any cross-section of a conductor is called

Question # 26

The value of electrical constant of proportionality k is

Question # 27

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

Question # 28

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

Question # 29

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

Question # 30

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

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ECAT Physics Chapter 12 Important MCQ's

Sr.# Question Answer
1 The electric lines of force are
A. Imaginary
B. Physically existing everywhere
C. Physically existing near the charge
D. All of the above
2 The unit of resistance is
A. volt
B. ampere
C. ohm
D. coat
3 If the distance between the plates of a parallel plate condenser of capacity 10μF is doubled then new capacity will be
A. 5μF
B. 20μF
C. 10μF
D. 15μF
4 Cause of heat production in a current carrying conductor is
A. Collisions of free electrons with one another
B. High drift speed of free electrons
C. Collisions of free electrons with atoms or ions of conductor
D. High resistance value
5 A 100 W, 200 V bulb is connected to a 160 volts supply. The actual power consumption would be
A. 64 W
B. 80 W
C. 100 W
D. 125 W
6 The nature of capacity of electrostatic capacitor depends on
A. Shape
B. Size
C. Thickness of plates
D. Area
7 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
8 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)
A. 2
B. 1
C. 0.5
D. 1.5
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 The ratio of the gravitational force Fgto the electrostatic force Febetween two electrons at the same distance apart is approximately
A. 9.8
B. 24 x 1019
C. 24 x 1042
D. 24 x 10-44

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