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 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 # 2

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 # 3

The SI unit of capacitance is

Question # 4

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

Question # 5

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

Question # 6

The charge carriers in electrolyte are positive and negative

Question # 7

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

Question # 8

Two point charges A and B separated by a distance R attract each other with a force of 12 x 10-3N. The force between A and B when the charges on them are doubled and distance is halved

Question # 9

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

Question # 10

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?

Question # 11

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

Question # 12

Ohm's law states that

Question # 13

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

Question # 14

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 # 15

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

Question # 16

The SI unit of permitivity is

Question # 17

The unit of resistance is

Question # 18

If 2.2 kilowatt power is transmitted through a 10 ohm line at 22000 volt, the power loss in the form of heat will be

Question # 19

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

Question # 20

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

Question # 21

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

Question # 22

A condenser of capacity 50μF is charged to 10 V.The energy stored is

Question # 23

The unit of intensity of electric field is

Question # 24

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

Question # 25

If we plot graph between potential difference (V) and current (I) obeying ohm's law, it will give us

Question # 26

A piece of fuse wire melts when a current of 15 ampere flows through it. With this current. If it dissipates 22.5 W, the resistance of fuse wire will be

Question # 27

Free electrons are

Question # 28

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

Question # 29

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 # 30

The SI unit of electric flux is

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ECAT Physics Chapter 12 Important MCQ's

Sr.# Question Answer
1 The charge carriers in electrolyte are positive and negative
A. protons
B. electrons
C. ions
D. none of these
2 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
3 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
4 The resistivity of a substance depends upon the
A. length
B. mass
C. area
D. temperature
5 Resistance of a conductor depends upon
A. the quantity of current passing through it
B. the voltage applied between its end
C. its dimensions, physical state and nature of its material
D. all of the above
6 One electron volt is equal to
A. 1.6 x 1019eV
B. 6.25 x 1018 eV
C. 1.6 x 1018 eV
D. 6.25 x 1019eV
7 A wire of radius r has resistance R. If it is stretched to a wire of r/2 radius, then the resistance becomes
A. 2R
B. 4R
C. 16R
D. Zero
8 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
9 Two conductors having the same type of charges are connected by a conducting wire. There would not be any amount of charges on them if
A. They have the same potential
B. They have the same amount of charge
C. They have the same capacity
D. They have the same shape
10 The capacity of a parallel plat capacitor depends on the
A. Type to metal used
B. Thickness of plates
C. Potential applied across the plates
D. Separation between the plates

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