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

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

Question # 2

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 # 3

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

Question # 4

The electrode connected with the positive terminal of the current source is called

Question # 5

A uniform resistance wire of Length L and diameter d has a resistance R. Another wire of same material has length, 4L and diameter 2d, the resistance will be

Question # 6

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

Question # 7

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

Question # 8

An electric charge at rest is

Question # 9

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 # 10

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

Question # 11

One joule is equal to

Question # 12

Ohm is the unit of

Question # 13

Heating effect caused by an electric circuit is written

Question # 14

A cube of metal is given a positive charge Q. For the above system, which of the following statements is true?

Question # 15

Current provided by a battery is maximum when

Question # 16

The energy stored in a charge capacitor

Question # 17

The SI unit of current is

Question # 18

A capacitor is charged with a battery and then it is disconnected. A slab of dielectric is now inserted between the plates, then

Question # 19

The electric flux from a closed surface

Question # 20

The SI unit of conductivity is

Question # 21

The electric potential at the surface of an atomic nucleus (Z = 50) of radius 9.0 x 10-15 is

Question # 22

The value of electrical constant of proportionality k is

Question # 23

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

Question # 24

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

Question # 25

The liquid which conduct current is known as

Question # 26

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

Question # 27

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

Question # 28

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

Question # 29

The graphical representation of ohm's law is

Question # 30

In RC series circuit the time during which the capacitor acquires 0.63 times the equilibrium charge is called

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ECAT Physics Chapter 12 Important MCQ's

Sr.# Question Answer
1 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
2 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?
A. 60 W bulb
B. 100 W bulb
C. Both equally
D. None of these
3 Surface density of charge is defined as
A. Charge per unit volume
B. Charge per unit length
C. Charge per unit area
D. Charge per unit mass
4 Some charge is being given to a conductor. Then its potential
A. Is maximum at surface
B. Is maximum at centre
C. Is remain same throughout the conductor
D. Is maximum somewhere between surface and centre
5 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
6 Which one of the following is the unit of electric field intensity
A. JC-1
B. Vm-1
C. Cm-1
D. CJ-1
7 The electric intensity at infinite distance from the point charge will be
A. Infinite
B. Positive
C. Zero
D. Negative
8 Potentiometer is more sensitive than voltmeter, because
A. Voltmeter has a very high resistance
B. Voltmeter has a very low resistance
C. Potentiometer does not draw any current from a source of unknown potential difference
D. Potentiometer is sensitive
9 The thermistors are usually made of
A. Metals with low temperature coefficient of resistivity
B. Metals with high temperature coefficient of resistivity
C. Metal oxides with high temperature coefficient of resistivity
D. Semi conducting materials having low temperature coefficient of resistivity
10 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
A. 0.4 A
B. 11.4 A
C. 9.8 A
D. 10.6 A

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