Resistance and Resistivity

Q.

The reciprocal of resistance is known as specific conductance.

1. True
2. False

Q.

Define the term resistivity.

Q.

A wire is stretched to double its length. What will be its new resistivity?

Q. Rajat, Sarath and Komal decided to measure resistance of aluminium and took bars of aluminium separately and measured its resistance in same room but got different values of resistance, of same material aluminium. What can be the probable reasons for these variations in resistance for same material?

1. they took bars of same length but different cross section area
2. they took bars of same cross section area but different length.
3. both length and cross section area of bars were different
4. All of the above