ECAT Pre General Science Physics Chapter 12 MCQ Test With Answer

MCQ's Test For ECAT Pre General Science Physics Chapter 12 Electrostatics

Try The MCQ's Test For ECAT Pre General Science Physics Chapter 12 Electrostatics

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ECAT Pre General Science Physics Chapter 12 Electrostatics

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Question # 1

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

Question # 2

The force between two chares 0.06 m apart is 5 N. If each charge is moved towards the other by 0.01 m, then the force between them will become

Question # 3

When three identical bulbs of 60 watt, 200 volt rating are connected in series to a 200 volt supply, the power drawn by them will be

Question # 4

The graphical representation of ohm's law is

Question # 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

Question # 6

Electron volt is the unit of

Question # 7

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 # 8

Two point charge +3μC and +8μC repel each other with a force of 40 N. If a charge of -5μC is added to each of them, then the force between then will become

Question # 9

The electric field will be uniform

Question # 10

A closed surface contains two equal and opposite charges. The net electric flux from the surface will be

Question # 11

The thermistors are usually made of

Question # 12

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

Question # 13

Surface density of charge is defined as

Question # 14

The dot product of electric field intensity E and vector area A is called

Question # 15

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

Question # 16

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

Question # 17

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

Question # 18

The resistance of the given conductor can be increased by

Question # 19

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

Question # 20

In a voltmeter the conduction takes place due to

Question # 21

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

Question # 22

Electron volt is the unit of.

Question # 23

The ohm's is defined as

Question # 24

The electric flux from a closed surface

Question # 25

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

Question # 26

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

Question # 27

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

Question # 28

What is the current is a 2 x 106ohm resistor having a potential difference of 2 x 103volts?

Question # 29

Resistor is a device which convert electric energy to

Question # 30

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

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ECAT Physics Chapter 12 Important MCQ's

Sr.# Question Answer
1 The earth's potential is taken as
A. Negative
B. Positive
C. Zero
D. Infinite
2 The electric lines of force are
A. Imaginary
B. Physically existing everywhere
C. Physically existing near the charge
D. All of the above
3 The unit of conductance is
A. ohm
B. meter
C. mho
D. ohm-meter
4 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
5 The energy stored in a charge capacitor
A. 1/2CV2
B. 1/2C2V
C. 1/2C/V2
D. None of these
6 Magnetic effect at a point caused due to flow a current depend upon the
A. Quantity of current
B. Distance from current
C. Both the quantity of current and distance from current element
D. None of the all
7 The SI unit of current is
A. watt
B. coulomb
C. volt
D. ampere
8 A capacitor of capacity 1μF is charged to 1 KV. The energy stored in J
A. 5
B. 0.5
C. 0.005
D. 50
9 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
10 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
A. Increase
B. Decrease
C. Remain F
D. Become 10F/9

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