Question

Match List-I with List-II.
List-I
A. Alcohol test
B. COB test
C. MBRT test
D. DM test
List-II
I. To determine the extent of bacterial contamination and growth in milk
II. To identify the type of microorganisms present in milk
III. To determine acidity of milk
IV. Heat stability of milk
Choose the correct answer.

• A. A-IV, B-III, C-I, D-II
• B. A-IV, B-III, C-I, D-II
• C. A-II, B-I, C-III, D-IV
• D. A-IV, B-III, C-I, D-II

Hint:

MBRT measures bacterial activity through dye reduction.

Answer 1

The Correct Option is A

Concept: Different milk tests evaluate quality, microbial load, and stability.

Step 1: Alcohol test.

• Determines heat stability of milk
• Coagulation indicates instability

Step 2: COB (Clot on Boiling).

• Indicates developed acidity
• Milk clots if acidity is high

Step 3: MBRT (Methylene Blue Reduction Test).

• Measures microbial load
• Faster decolorization → higher bacterial count

Step 4: DM test.

• Identifies type of microorganisms

Step 5: Matching.
\[ A \rightarrow IV,\quad B \rightarrow III,\quad C \rightarrow I,\quad D \rightarrow II \] Conclusion: Option (1) correct.