ECAT Pre General Science Physics Chapter 12 MCQ Test With Answer

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

Battery is charged in motor cars, which is based on

Question # 2

The nature of capacity of electrostatic capacitor depends on

Question # 3

One joule is equal to

Question # 4

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 # 5

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

Question # 6

A capacitor of capacity 1μF is charged to 1 KV. The energy stored in J

Question # 7

The unit of resistance is

Question # 8

A point charge A of charge +4μC and another B of charge -1μC are placed in air at a distance 1 m apart. Then the distance of the point on the line joining the charge B, where the resultant electric field is zero, is (in m)

Question # 9

The capacity of a parallel plat capacitor depends on the

Question # 10

Ohm established a relation between

Question # 11

Physicist George Simon ohm was a

Question # 12

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

Question # 13

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

Question # 14

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

Question # 15

The powers of tow electric bulbs are 100 W and 200 W. Both of them are joined with 220 V mains. The ratio of resistances of their filaments will be

Question # 16

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

Question # 17

A conducting wire is drawn to double its length. Final resistivity of the material will be

Question # 18

Force acting upon a charged particle kept between the plates of a charged condenser if F. IF one of the plates of the condenser is removed, force acting on the same will become

Question # 19

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 # 20

The ohm's is defined as

Question # 21

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

Question # 22

Ohm's law states that

Question # 23

If the distance between the plates of a parallel plate condenser of capacity 10μF is doubled then new capacity will be

Question # 24

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

Question # 25

In a Milikian's oil drop experiment the charge on an oil drop is calculated to be 6.35 x 10-19C. The number of excess electrons on the drop is

Question # 26

The electric intensity outside the two oppositely charged parallel metal plates is

Question # 27

An electric charge at rest is

Question # 28

A charge Q is divided into two parts q and Q - q and separated by a distance R. The force of repulsion between them will be maximum when

Question # 29

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

Question # 30

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

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ECAT Physics Chapter 12 Important MCQ's

Sr.# Question Answer
1 Which one of the following is the unit of electric field intensity
A. JC-1
B. Vm-1
C. Cm-1
D. CJ-1
2 At any point on the right bisector of the line joining two equal and opposite charges
A. At electric field is zero
B. The electric potential is zero
C. The electric potential decreases with increasing distance from the centre
D. The electric field is perpendicular to the line joining the charges
3 Solar cell converts sunlight directly into
A. potential energy
B. thermal energy
C. mechanical energy
D. electrical energy
4 The fractional change in resistance per kelvin is known as
A. temperature coefficient
B. resistance coefficient
C. super temperature
D. critical temperature
5 The SI unit of electric field intensity is
A. CN-1
B. NC-1or Vm-1
C. JC-1
D. AV-1
6 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
7 Force acting upon a charged particle kept between the plates of a charged condenser if F. IF one of the plates of the condenser is removed, force acting on the same will become
A. Zero
B. F/2
C. F
D. 2F
8 The electric intensity outside the two oppositely charged parallel metal plates is
A. Maximum
B. Minimum
C. Zero
D. Infinite
9 In a voltmeter the conduction takes place due to
A. Electrons only
B. Holes only
C. Electrons and holes
D. Electrons and ions
10 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

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