ECAT Pre General Science Physics Chapter 12 MCQ Test With Answer

MCQ's Test For ECAT Pre General Science Physics Chapter 12 Electrostatics

Try The 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

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

Question # 2

The capacity of a parallel plat capacitor depends on the

Question # 3

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

Question # 4

Electron volt is the unit of

Question # 5

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 # 6

The SI unit of conductivity is

Question # 7

The relation between charge 'Q' and current 'I' is given by

Question # 8

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

Question # 9

One joule is equal to

Question # 10

A current of 1.6 A is passed through a solution of CuSO4. How many Cu2+ions are liberated in one minute?

Question # 11

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

Question # 12

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

Question # 13

Magnetic effect at a point caused due to flow a current depend upon the

Question # 14

The ratio of the gravitational force Fgto the electrostatic force Febetween two electrons at the same distance apart is approximately

Question # 15

One coulomb of charge is created by

Question # 16

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

Question # 17

Electric generators which convert mechanical energy into

Question # 18

A 10 F capacitor is charged to a potential difference of 50 V and is connected to another uncharged capacitor in parallel. Now the common potential difference becomes 20 volt.The capacitance of second capacitor is

Question # 19

The speed of randomly moving electrons depends upon

Question # 20

The capacitance of a parallel plate capacitor depends upon

Question # 21

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

Question # 22

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

Question # 23

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

Question # 24

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

Question # 25

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

Question # 26

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

Question # 27

Current provided by a battery is maximum when

Question # 28

The energy required to charge a capacitor of 5μF by connecting D.C. source of 20 KV is

Question # 29

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

Question # 30

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

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ECAT Physics Chapter 12 Important MCQ's

Sr.# Question Answer
1 If we increase the distance between two plates of the capacitor, the capacitance will
A. Increase
B. Decrease
C. Remain same
D. First increase then decrease
2 Taking the earth to be a spherical conductor of diameter 12.8 x 103km. Its capacity will be
A. 711μF
B. 611μF
C. 811μF
D. 511μF
3 Ohm is the unit of
A. current
B. capacitance
C. energy
D. resistance
4 The resistivity of a substance depends upon the
A. length
B. mass
C. area
D. temperature
5 The unit of resistivity is
A. ohm
B. ohm-m2
C. ohm-meter
D. ohm-m-1
6 The dot product of electric field intensity E and vector area A is called
A. Electric potential
B. Electric flux
C. Electric field
D. Magnetic field
7 The capacitance of a parallel plate capacitor depends upon
A. Area of the plates
B. Separation between the plates
C. Medium between the plates
D. All of the above
8 The colour sequence in a carbon resistor in red, brown, orange and silver. The resistance of the resistor is
A. 21 x 103+ 10%
B. 23 x 101+ 10%
C. 21 x 103+ 5%
D. 12 x 103+ 5%
9 Current provided by a battery is maximum when
A. Internal resistance equal to external resistance
B. Internal resistance is greater than external resistance
C. Internal resistance is less then external resistance
D. None of these
10 The statement "the electric force of repulsion or attraction between two point charges is directly proportional to the product of the charges and inversely proportional to square of the distance between them" refer to
A. Coulomb's law
B. Gauss's law
C. Biot-Sarwat law
D. Ampere's law

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