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

Resistor is a device which convert electric energy to

Question # 2

Which one of the following causes production of heat when current is set up in a wire?

Question # 3

If the distance between the plates of a parallel plate condenser of capacity 10μF is doubled then new capacity will be

Question # 4

The resistance of an incandescent lamp is

Question # 5

Free electrons are

Question # 6

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 # 7

The unit of resistivity is

Question # 8

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

Question # 9

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 # 10

A parallel plate capacitor is first charged and then a dielectric slab is introduced between the plates. The quantity that remains unchanged is

Question # 11

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

Question # 12

The electric field will be uniform

Question # 13

One coulomb of charge is created by

Question # 14

Current provided by a battery is maximum when

Question # 15

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

Question # 16

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

Question # 17

The potential difference across each resistance in series combination is

Question # 18

The nature of capacity of electrostatic capacitor depends on

Question # 19

Thermocouple is an arrangement of two different metals

Question # 20

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

Question # 21

The SI unit of conductivity is

Question # 22

The unit of conductance is

Question # 23

The value of electrical constant of proportionality k is

Question # 24

Capacitance of two or more capacitors

Question # 25

Ohm established a relation between

Question # 26

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

Question # 27

The SI unit of capacitance is

Question # 28

A current of 1.6 A is passed through a solution of CuSO4. How many Cu2+ions are liberated in one minute?

Question # 29

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

Question # 30

One moving a charge of 20 coulombs by 2 cm, 2 J of work is done, then the potential difference between the points is

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Sr.# Question Answer
1 If the distance of separation between two chares is increased, the electrical potential energy of the system will
A. Increase
B. Decrease
C. May increase or decrease
D. Remain the same
2 A ten ohm electric heater operates on a 110 V line. Calculate the rate at which it develops heat in watts
A. 1310 W
B. 670 W
C. 810 W
D. 1210 W
3 The liquid which conduct current is known as
A. heating effect
B. chemical energy
C. electrolyte
D. ohm's law
4
Question Image
A. 5μF
B. 10μF
C. 3μF
D. 6μF
5 The potential difference across the conductors should be maintained constant by connecting the ends of wire to the terminal of a device called a source of
A. power
B. current
C. resistance
D. temperature
6 In case of a parallel plate capacitor if the plate separation is doubled and plate area is halved, the capacitance becomes
A. Four-fold
B. One-half
C. One-fourth
D. Zero
7 The resistance of an incandescent lamp is
A. Smaller when switched on
B. Greater when switched off
C. The same whether it is switch off or switch on
D. Greater when switched on
8 The fractional change in resistance per kelvin is known as
A. temperature coefficient
B. resistance coefficient
C. super temperature
D. critical temperature
9 The charge carriers in gases are
A. electrons
B. ions
C. protons
D. ions and electrons
10 At any point on the right bisector of the line joining two equal and opposite charges
A. At electric field is zero
B. The electric potential is zero
C. The electric potential decreases with increasing distance from the centre
D. The electric field is perpendicular to the line joining the charges
11 Ohm is the unit of
A. current
B. capacitance
C. energy
D. resistance
12 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
13 The SI unit of capacitance is
A. Farad
B. Henry
C. Ohm
D. Volt
14 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
15 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
16 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
17 Which one of the following causes production of heat when current is set up in a wire?
A. Fall of electrons from higher orbits to lower orbits
B. Inter-atomic collisions
C. Inter-electron collisions
D. Collisions of conduction electron with atoms
18 An electric charge at rest is
A. Only an electric field
B. Only a magnetic field
C. Both electric and magnetic fields
D. None of the above
19 The electric intensity at infinite distance from the point charge will be
A. Infinite
B. Positive
C. Zero
D. Negative
20 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
21 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
22 At ordinary temperature, an increase in temperature increases the conductivity of
A. Conductor
B. Semiconductor
C. Insulator
D. Alloy
23 The earth's potential is taken as
A. Negative
B. Positive
C. Zero
D. Infinite
24 A closed surface contains two equal and opposite charges. The net electric flux from the surface will be
A. Negative
B. Positive
C. Infinite
D. Zero
25 The SI unit of current is
A. watt
B. coulomb
C. volt
D. ampere
26 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
27 The conventional current in a circuit is defined as " current which passes from a point at higher potential to a point at lower potential as if it represent a movement of
A. negative charges
B. positive charges
C. protons
D. electrons
28 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
29 Two electric bulbs of 200 W and 100 W have same voltage. If R1and R2be their resistance respectively then
A. R1= 2R2
B. R2= 2R1
C. R2 = 4R1
D. R1= 4R2
30 Which one of the following has larger value of relative permitivity Erat room temperature?
A. Vaccum
B. Air
C. Glass
D. Water

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