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

If the resistance of 2 ohm and 4 ohm are connected in parallel, the equivalent resistance will be

Question # 2

Free electrons are

Question # 3

One moving a charge of 20 coulombs by 2 cm, 2 J of work is done, then the potential difference between the points is

Question # 4

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

Question # 5

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

Question # 6

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

Question # 7

In case of a parallel plate capacitor if the plate separation is doubled and plate area is halved, the capacitance becomes

Question # 8

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

Question # 9

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 # 10

Resistance of a conductor depends upon

Question # 11

The SI unit of permitivity is

Question # 12

The potential difference across each resistance in series combination is

Question # 13

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

Question # 14

For two resistance wires joined in parallel, the resultant resistance is 6/5 ohm. When one of the resistance wire breaks, the effective resistance becomes 2 ohm. The resistance of the broken wire is

Question # 15

Electric generators which convert mechanical energy into

Question # 16

The electric lines of force are

Question # 17

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

Question # 18

One joule is equal to

Question # 19

The electric intensity at infinite distance from the point charge will be

Question # 20

In bringing an electron towards another electron, electrostatic potential energy of system

Question # 21

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

Question # 22

The speed of randomly moving electrons depends upon

Question # 23

Two electric bulbs of 200 W and 100 W have same voltage. If R1and R2be their resistance respectively then

Question # 24

Capacitance of two or more capacitors

Question # 25

Heating effect caused by an electric circuit is written

Question # 26

The liquid which conduct current is known as

Question # 27

In a voltmeter the conduction takes place due to

Question # 28

Cause of heat production in a current carrying conductor is

Question # 29

The earth's potential is taken as

Question # 30

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

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ECAT Physics Chapter 12 Important MCQ's

Sr.# Question Answer
1 The electric field due to an infinite long thin wire at a distance R varies as
A. 1/R
B. 1/R2
C. R
D. R2
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 Physicist George Simon ohm was a
A. German physical
B. French physicist
C. Chinese physicist
D. Russian physicist
4 106electrons are moving through a wire per second, the current developed is
A. 1.6 x 10-19
B. 1 A
C. 1.6 x 10-15 A
D. 106A
5 The electric potential at the surface of an atomic nucleus (Z = 50) of radius 9.0 x 10-15 is
A. 9 x 105V
B. 9 V
C. 8 x 106V
D. 80 V
6 The ratio of the gravitational force Fgto the electrostatic force Febetween two electrons at the same distance apart is approximately
A. 9.8
B. 24 x 1019
C. 24 x 1042
D. 24 x 10-44
7 The fractional change in resistance per kelvin is known as
A. temperature coefficient
B. resistance coefficient
C. super temperature
D. critical temperature
8
Question Image
A. 5μF
B. 10μF
C. 3μF
D. 6μF
9 The resistance of the given conductor can be increased by
A. Increasing the area
B. Changing resistivity
C. Decreasing the length
D. None of the above because change does not matter because in any case the volume remains the same
10 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
A. 1/3 V
B. 2/3 V
C. 3/2 V
D. 3V

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