What is the maximum resistance
Question:

What is the maximum resistance which can be made using five resistors each 1/5 Ω ?

(a) 10 Ω

(b) 10 Ω

(c) 5 Ω

(d) I Ω (CBSE 2010)

Solution:

(d).

Explanation: $R=\frac{1}{5}+\frac{1}{5}+\frac{1}{5}+\frac{1}{5}+\frac{1}{5}=1 \Omega$