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

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

Question # 2

In case of a parallel plate capacitor if the plate separation is doubled and plate area is halved, the capacitance becomes

Question # 3

When a dielectric material is introduced between the plates of a charged condenser the electric field between the plates

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

Question # 6

Thermocouple is an arrangement of two different metals

Question # 7

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

Question # 8

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

Question # 9

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

Question # 10

One electron volt is equal to

Question # 11

The concept of field theory was put forward by

Question # 12

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)

Question # 13

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

Question # 14

Consider a spherical shell of metal at he centre of which a positive point charge is kept

Question # 15

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

Question # 16

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

Question # 17

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

Question # 18

In a building, there are 15 bulbs of 40 watts, 5 bulbs of 100 watts, 5 fans of 80 watts and a heater of 1 kilowatt. The voltage of the electric main is 220 volts. The minimum efficiency of the main fuse of the building will be

Question # 19

At ordinary temperature, an increase in temperature increases the conductivity of

Question # 20

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

Question # 21

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

Question # 22

The electric lines of force are

Question # 23

A charge of 0.1 c accelerated through a potential difference of 1000V acquires kinetic energy

Question # 24

Resistor is a device which convert electric energy to

Question # 25

Capacitance of two or more capacitors

Question # 26

The speed of randomly moving electrons depends upon

Question # 27

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

Question # 28

The electric flux from a closed surface

Question # 29

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

Question # 30

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

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ECAT Physics Chapter 12 Important MCQ's

Sr.# Question Answer
1 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
2 Coulomb's force between two point charges depends upon
A. Magnitude of charges
B. Distance between them
C. Medium in which they are located
D. All of the above
3 If the resistance of 2 ohm and 4 ohm are connected in parallel, the equivalent resistance will be
A. 6 ohm
B. 4 ohm
C. zero ohm
D. 1.33 ohm
4 A conducting wire is drawn to double its length. Final resistivity of the material will be
A. Double of the original one
B. Half of the original one
C. One fourth of the original one
D. Same as original one
5 Current provided by a battery is maximum when
A. Internal resistance equal to external resistance
B. Internal resistance is greater than external resistance
C. Internal resistance is less then external resistance
D. None of these
6 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
7 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
8 If one volt is needed to cause a current of one ampere to flow in a conductor, its resistance is
A. one ohm
B. one joule
C. one volt
D. one ampere
9 One coulomb per second is equal to
A. One volt
B. One ampere
C. One hom
D. One henry
10 The resistance of a conductor does not depend on its
A. mass
B. resistivity
C. length
D. cross-sectional area

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