Electric Current MCQs : This section focuses on the "Electric Current" in Physics Class 12. These Multiple Choice Questions (MCQs) should be practiced to improve the Physics Class 12 skills required for various interviews (campus interview, walk-in interview, company interview), placement, entrance exam and other competitive examinations.
___________ is the rate of flow of electrons in a conductor.
C. Electric Current
Explanation: Electric Current is the rate of flow of electrons in a conductor.
The SI Unit of electric current is the?
Explanation: The SI Unit of electric current is the Ampere.
Silver is the best conductor of electricity.
C. Can be true or false
D. Can not say
Explanation: True, Silver is the best conductor of electricity.
____________ are materials that restrict the free flow of electrons from one particle to another
Explanation: Insulators are materials that restrict the free flow of electrons from one particle to another. The particles of the insulator do not allow the free flow of electrons; subsequently, charge is seldom distributed evenly across the surface of an insulator.
The ___________ is from positive to the negative terminal and indicates the direction that positive charges would flow.
A. electron flow
B. conventional current flow
C. normal flow
D. None of the above
Explanation: The conventional current flow is from positive to the negative terminal and indicates the direction that positive charges would flow.
What is the number of electrons that constitutes a current of one Ampere?
A. 2.25 × (10^18)
B. 2.25 × (10^19)
C. 6.25 × (10^18)
D. 6.25 × (10^21)
Explanation: Number of electrons that constitutes a current of one Ampere is (6.25 × 10^18).
Which of these is a correct definition of conventional current?
A. Current that flows from lower potential to higher potential
B. The current which remains static
C. Current constituted by the flow of ions
D. Current that flows from higher potential to lower potential
Explanation: The current that flows from a point at the higher (positive) potential to a point at lower (negative) potential is called conventional current. The direction of motion of positive charges is taken as the direction of electric current.
Which type of current is flowing through a circuit?
A. Static current
B. Conventional current
C. Electronic current
D. Potential current
Explanation: The carriers of electric current are electrons. The current in a circuit is due to the flow of electrons. Therefore, the direction of the conventional current is opposite to the direction of flow of electrons.
Which type of a physical quantity is electric current?
A. Scalar quantity
B. Vector quantity
C. Bipolar quantity
D. Thermodynamic quantity
Explanation: The electric current is a scalar quantity. Laws of ordinary algebra are used to add electric currents and the law of vector algebra are not applicable.
The magnitude of electric current is measured in coulombs per second.
C. Can be yes or no
D. Can not say
Explanation: Yes, The magnitude of electric current is measured in coulombs per second.