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

Question # 2

A point charge Q is placed at the mid-point of a line joining two charges. 4q and q. if the net force on charge q is zero. then Q must be equal to

Question # 3

The resistance of an incandescent lamp is

Question # 4

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 # 5

The unit of conductance is

Question # 6

A hollow insulated conduction sphere is given a positive charge of 10μC. What will be the electric field at the centre of the sphere if its radius is 2 meters?

Question # 7

The substances whose resistance decreases with the increase in temperature these substances have coefficient of

Question # 8

The electric lines of force are

Question # 9

The minimum charge on any object can not be less than

Question # 10

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

Question # 11

The ohm's is defined as

Question # 12

The capacity of a parallel plat capacitor depends on the

Question # 13

The liquid which conduct current is known as

Question # 14

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

Question # 15

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

Question # 16

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

Question # 17

Battery is charged in motor cars, which is based on

Question # 18

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

Question # 19

If an electron of charge 'e' is accelerated through a potential difference V., it will acquire energy

Question # 20

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 # 21

The SI unit of permitivity is

Question # 22

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

Question # 23

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

Question # 24

The excess (equal in number) of electrons that must be placed on each of two small spheres spaced 3 cm apart, with force of repulsion between the spheres to be 10-19N, is

Question # 25

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

Question # 26

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

Question # 27

The relation V = IR represents

Question # 28

The resistance of the given conductor can be increased by

Question # 29

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

Question # 30

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)

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ECAT Physics Chapter 12 Important MCQ's

Sr.# Question Answer
1 The resistance of a conductor does not depend on its
A. mass
B. resistivity
C. length
D. cross-sectional area
2 In RC series circuit the time during which the capacitor acquires 0.63 times the equilibrium charge is called
A. Time constant
B. Decay constant
C. None of these
D. All of above
3 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
4 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
5 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
6 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
7 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
8 A (100 W , 200 W) bulb is connected to a 160 V power supply. The power consumption would be
A. 64 W
B. 80 W
C. 100 W
D. 125 W
9 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
10 The relation V = IR represents
A. Ampere law
B. Faraday's law
C. Ohm's law
D. Len's law

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