ECAT Pre Computer Science Chapter 12 MCQ Test With Answer

MCQ's Test For ECAT Physics Chapter 12 Electrostatics

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ECAT Physics Chapter 12 Electrostatics

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Question # 1

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 # 2

If the two charges in Coulomb's law have double distance between them, then electric force

Question # 3

The charge carriers in gases are

Question # 4

Electron volt is the unit of

Question # 5

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

Question # 6

106electrons are moving through a wire per second, the current developed is

Question # 7

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 # 8

A condenser of capacity 50μF is charged to 10 V.The energy stored is

Question # 9

Consider a spherical shell of metal at he centre of which a positive point charge is kept

Question # 10

Thermocouple is an arrangement of two different metals

Question # 11

The charge carriers in electrolyte are positive and negative

Question # 12

The electric field will be uniform

Question # 13

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

Question # 14

Two point charge +3μC and +8μC repel each other with a force of 40 N. If a charge of -5μC is added to each of them, then the force between then will become

Question # 15

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

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ECAT Physics Chapter 12 Important MCQ's

Sr.# Question Answer
1 The ohm's is defined as
A. 1 ampere / 1 volts
B. 1 coulomb / 1 volt
C. 1 volt / 1 ampere
D. 1 volt / 1 coulomb
2 Heating effect caused by an electric circuit is written
A. H = I2Rt
B. H = I2R
C. H = IR2t
D. H = IR2
3 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
4 The charge per unit time through any cross-section of a conductor is called
A. capacitance
B. electric power
C. current
D. potential difference
5 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
6 When a dielectric material is introduced between the plates of a charged condenser the electric field between the plates
A. Decreases
B. Increases
C. No change
D. May increase or decresase
7 A metal plate of thickness half the separation between the capacitor plates of capacitance C is inserted. The new capacitance is
A. C
B. C/2
C. Zero
D. 2C
8 In case of a parallel plate capacitor if the plate separation is doubled and plate area is halved, the capacitance becomes
A. Four-fold
B. One-half
C. One-fourth
D. Zero
9 Ohm's law states that
A. The current through a resistor is directly proportional to the applied voltage
B. The voltage across a resistor is directly proportional to the current passing through it
C. Resistance is the constant of proportionality between the voltage and current
D. all of these
10 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

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