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

When three identical bulbs of 60 watt, 200 volt rating are connected in series to a 200 volt supply, the power drawn by them will be

Question # 2

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

Question # 3

Which one of the following is the unit of electric field intensity

Question # 4

Thermocouple is an arrangement of two different metals

Question # 5

The potential difference across each resistance in series combination is

Question # 6

Surface density of charge is defined as

Question # 7

Resistance of a conductor depends upon

Question # 8

The SI unit of capacitance is

Question # 9

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

Question # 10

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

Question # 11

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

Question # 12

Resistor is a device which convert electric energy to

Question # 13

The dot product of electric field intensity E and vector area A is called

Question # 14

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 # 15

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

Question # 16

Three resistance 500,500 and 50 ohms are connected in series across 555 volts mains. The current flowing through them will be

Question # 17

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

Question # 18

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

Question # 19

If one volt is needed to cause a current of one ampere to flow in a conductor, its resistance is

Question # 20

The resistance of the given conductor can be increased by

Question # 21

Calculate the amount of charge flowing in 2 minutes in a wire of resistance 10Ωwhen a potential difference of 20 V is applied between its ends

Question # 22

If a 40 watt light bulb burns for 2 hours. how much heat is generated

Question # 23

The substances whose resistance decreases with the increase in temperature these substances have coefficient of

Question # 24

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

Question # 25

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 # 26

The charge carriers in gases are

Question # 27

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

Question # 28

The capacity of a parallel plat capacitor depends on the

Question # 29

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 # 30

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

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ECAT Physics Chapter 12 Important MCQ's

Sr.# Question Answer
1 A medium of dielectric constant 'K' is introduced between the plates of parallel plate condenser. As a result its capcitance
A. Increase k time
B. Decreases k times
C. Decreases 1/K times
D. Remains unchanged
2 The current through a metallic conductor is due to the motion of
A. protons
B. neutrons
C. electrons
D. free electrons
3 At ordinary temperature, an increase in temperature increases the conductivity of
A. Conductor
B. Semiconductor
C. Insulator
D. Alloy
4 The potential difference across the conductors should be maintained constant by connecting the ends of wire to the terminal of a device called a source of
A. power
B. current
C. resistance
D. temperature
5 If one volt is needed to cause a current of one ampere to flow in a conductor, its resistance is
A. one ohm
B. one joule
C. one volt
D. one ampere
6 The charge carriers in electrolyte are positive and negative
A. protons
B. electrons
C. ions
D. none of these
7 A current of 1.6 A is passed through a solution of CuSO4. How many Cu2+ions are liberated in one minute?
A. 3 x 1020
B. 3 x 1010
C. 6 x 1020
D. 6 x 1010
8 The charge per unit time through any cross-section of a conductor is called
A. capacitance
B. electric power
C. current
D. potential difference
9 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
10 The potential difference across each resistance in series combination is
A. same
B. different
C. zero
D. none of these

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