NextMockSearch exams, e.g. SSC CGL, UPPSC, Lekhpal
Railways PYQCBT 1 2016

RRB NTPC · Question 50

When milk becomes sour, _________ is produced. A. Lactose B. Lactic acid C. Salicylic acid D. Linoleic acid

  1. A

  2. D

  3. B

  4. C

Show answer & explanation

Answer: (C) B

Explanation

Milk turns sour when bacteria (Lactobacillus) ferment its sugar, lactose, into lactic acid. The acid makes milk taste sour and causes its protein (casein) to curdle, the same process used to make curd.