Question

In a plating experiment of milk, 1 ml of each \(10^{-2}\) and \(10^{-3}\) dilutions were plated out in duplicate. The volume of the actual milk sample used in the experiments is

• A. 4 ml
• B. 0.2 ml
• C. 0.22 ml
• D. 0.022 ml

Hint:

Duplicate means multiplying by \(2\).
- Volume from \(10^{-2}\) plates: \(2 \times 0.01 = 0.02\text{ ml}\).
- Volume from \(10^{-3}\) plates: \(2 \times 0.001 = 0.002\text{ ml}\).
- Sum: \(0.02 + 0.002 = 0.022\text{ ml}\).

Answer 1

The Correct Option is D