Question

assertion :resistivity of a substance depends on the nature of the substance and temperature
reason:the resistivity of a substance is a characteristic property of the material ​

Answer 1

Both assertion and reason statement is true and the reason stated is not a correct explanation of assertion.

• The assertion statement is 'Resistivity of a substance depends on the nature of the substance and temperature.' which is the correct statement.
• The resistivity of a substance depends on the number of free electrons, temperature, and nature of the material.
• The reason statement is 'The resistivity of a substance is a characteristic property of the material.'​ which is also a correct statement.
• The resistivity is a characteristic property of a material that opposes the flow of current through it.
• The reason stated is not the correct explanation of the assertion statement as the two statements are independent.

Hence, both the assertion and reason statement is true and the reason stated is not a correct explanation of assertion.

Answer 2

Answer:

Both A and R are true and R is not correct explanation of A.