Question

Match List-I with List-II.
List-I
A. Pasteurization temp-time combination for ice-cream mix
B. Pasteurization of milk (time-temp combination)
C. Sterilization of milk
D. Homogenization of milk
List-II
I. 106–115$^\circ$C/15–30 min
II. 72$^\circ$C/15 sec
III. 60$^\circ$C/5 sec
IV. 68$^\circ$C for not less than 30 min
Choose the correct answer.

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

Hint:

HTST = 72°C/15 sec; LTLT = 63°C/30 min.

Answer 1

The Correct Option is A

Concept: Different dairy processes use specific temperature-time combinations.

Step 1: Ice-cream mix pasteurization.

• Typically HTST method
• 72$^\circ$C for 15 sec

Step 2: Milk pasteurization (LTLT).

• 63–68$^\circ$C for 30 min

Step 3: Sterilization.

• Very high temperature
• 106–115$^\circ$C for extended time

Step 4: Homogenization.

• Mild heat treatment (~60$^\circ$C)

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