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

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 # 2

At any point on the right bisector of the line joining two equal and opposite charges

Question # 3

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

Question # 4

The electric field intensity at a point due to a point charge

Question # 5

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

Question # 6

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

Question # 7

The electric field due to an infinite long thin wire at a distance R varies as

Question # 8

If 2.2 kilowatt power is transmitted through 1 10 ohm line at 22000 volt, the power loss in the form of heat will be

Question # 9

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 # 10

The speed of randomly moving electrons depends upon

Question # 11

Battery is charged in motor cars, which is based on

Question # 12

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

Question # 13

Physicist George Simon ohm was a

Question # 14

Free electrons are

Question # 15

The resistance of the given conductor can be increased by

Question # 16

A parallel plate capacitor is first charged and then a dielectric slab is introduced between the plates. The quantity that remains unchanged is

Question # 17

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

Question # 18

The colour sequence in a carbon resistor in red, brown, orange and silver. The resistance of the resistor is

Question # 19

A 50 volt battery is connected across 10 ohm resistor. The current is 4.5 A. The internal resistance of the battery is

Question # 20

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

Question # 21

The unit of resistance is

Question # 22

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

Question # 23

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

Question # 24

A wire of radius r has resistance R. If it is stretched to a wire of r/2 radius, then the resistance becomes

Question # 25

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 # 26

The resistance of a conductor does not depend on its

Question # 27

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 # 28

The electric flux is linked with a surface will be maximum when

Question # 29

Solar cell converts sunlight directly into

Question # 30

The energy stored in a charge capacitor

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ECAT Physics Chapter 12 Important MCQ's

Sr.# Question Answer
1 A capacitor is charged with a battery and then it is disconnected. A slab of dielectric is now inserted between the plates, then
A. The charge in the plates reduces and potential difference increase
B. Potential difference between the plates increase, stored energy decreases and charge remains the same
C. Potential difference between the plates decreases and charge remains unchanged
D. None of the above
2 A ten ohm electric heater operates on a 110 V line. Calculate the rate at which it develops heat in watts
A. 1310 W
B. 670 W
C. 810 W
D. 1210 W
3 The unit of intensity of electric field is
A. newton/coluomb
B. jule/coluomb
C. volt x metre
D. newton/metre
4 A parallel plate capacitor is first charged and then a dielectric slab is introduced between the plates. The quantity that remains unchanged is
A. Charge Q
B. Potential V
C. Capacity
D. Energy U
5 The substances whose resistance decreases with the increase in temperature these substances have coefficient of
A. positive temperature
B. negative temperature
C. absolute temperature
D. zero temperature
6 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
A. negative charges
B. positive charges
C. protons
D. electrons
7 Ohm established a relation between
A. voltage and resistance
B. voltage and charge
C. voltage and current
D. voltage resistance and charge
8 Resistor is a device which convert electric energy to
A. Heat energy
B. Chemical energy
C. Elastic energy
D. All of the above
9 A one microfarad capacitor of a TV is subjected to 4000 V potential difference. The energy stored in capacitor is
A. 8 J
B. 16 J
C. 4 x 10-3J
D. 2 x 10-3J
10 Which of the following does not obey ohm's law?
A. Copper
B. Al
C. Diode
D. None

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