Question

The spread mark of milk was absent on the slide while performing the adulteration test for milk. The milk here is:

• A. Pure without adulteration
• B. Adulterated with water
• C. Adulterated with sugar
• D. Adulterated with urea

Answer 1

The correct option is B Adulterated with water

$\bullet$ Adulteration is the addition of foreign substances or removal of useful substances. Milk is usually adulterated with water or urea to increase the quantity for financial gain.
$\bullet$ In the adulteration test for milk, a drop of milk is placed on a slanted glass slide. Increase in water content decreases the thickness of milk and leaves no spread mark. Absence of spread mark on the slide, indicates the adulteration with water.
$\bullet$ Urea as an adulterant, increases the thickness of milk and always leaves spread mark on the slide.