Download the chapter on Current Electricity And Capacitance from the CBSE Class 12 Physics Assertion Reason Questions. Class 12 Physics Assertion Reason Questions with Answers were created using the most recent exam format. To gauge their degree of preparedness, students can complete the NCERT Class 12 Physics Chapter 3 Current Electricity.
Current Electricity Class 12 Assertion Reason Questions
The following questions consist of two statements – Assertion (A) and Reason (R). Answer these questions by selecting the appropriate option given below:
(a) Both A and R are true and R is the correct explanation of A.
(b) Both A and R are true but R is not the correct explanation of A.
(c) A is true but R is false.
(d) A is false and R is also false.
Assertion (A): The resistance of a conductor increases with an increase in its length.
Reason (R): The resistance of a conductor is directly proportional to its length.
Answer: (a) Both A and R are true and R is the correct explanation of A.
Assertion (A): The resistivity of a material depends on its temperature.
Reason (R): The resistivity of most materials increases with an increase in temperature.
Answer: (a) Both A and R are true and R is the correct explanation of A.
Assertion (A): In a parallel combination of resistors, the total resistance is less than the smallest individual resistance.
Reason (R): In parallel combination, the reciprocal of the total resistance is the sum of the reciprocals of the individual resistances.
Answer: (b) Both A and R are true but R is not the correct explanation of A.
Assertion (A): The electric current in a metallic conductor is due to the flow of protons.
Reason (R): In metallic conductors, electric current is carried by the movement of free electrons.
Answer: (d) A is false but R is true.
Assertion (A): The drift velocity of charge carriers in a conductor is directly proportional to the electric field applied to the conductor.
Reason (R): Drift velocity is the average velocity of charge carriers and depends on the strength of the electric field.
Answer: (a) Both A and R are true and R is the correct explanation of A.
Assertion (A): Electric power in a circuit can be calculated using the formula P = V × I, where V is the voltage and I is the current.
Reason (R): Power is the rate at which work is done or energy is transferred, and in an electrical circuit, it is given by the product of voltage and current.
Answer: (a) Both A and R are true and R is the correct explanation of A.
Assertion (A): Superconductors have zero resistivity at very low temperatures.
Reason (R): Superconductors are materials that exhibit perfect conductivity and zero electrical resistance below a critical temperature.
Answer: (a) Both A and R are true and R is the correct explanation of A.
Assertion (A): Electric potential is a vector quantity.
Reason (R): Electric potential is a scalar quantity representing the electric potential energy per unit charge at a point.
Answer: (c) A is true but R is false.
Assertion (A): Kirchhoff’s junction rule is based on the principle of conservation of charge.
Reason (R): Kirchhoff’s junction rule states that the total current entering a junction is equal to the total current leaving the junction.
Answer: (a) Both A and R are true and R is the correct explanation of A.
Assertion (A): An ideal ammeter has zero resistance and is connected in parallel in a circuit.
Reason (R): An ideal ammeter should not change the current in the circuit when connected.
Answer: (d) A is false but R is true.
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