Question

Butyro Refracto meter is used to measure
A. Purity of ghee
B. B R reading of ghee
C. Fat content in milk
D. Vitamin content in milk
Choose the correct answer from the options given below:

• A. A and C are correct
• B. A, B, C, D are wrong
• C. A, B, C, D are correct
• D. A and B are correct

Hint:

Associate specific instruments with their primary function in a dairy lab: Lactometer for specific gravity of milk, Gerber Centrifuge for fat percentage, and Butyro-refractometer for the purity of ghee/butterfat.

Answer 1

The Correct Option is D

Step 1: Understanding the Concept:
The question asks about the application of a Butyro-refractometer in the context of dairy products. A refractometer is an instrument that measures the refractive index of a substance.
Step 2: Detailed Explanation:
Let's analyze the given uses:
A. Purity of ghee: Ghee (clarified butterfat) has a specific range for its refractive index. The Butyro-refractometer measures this value, known as the BR reading. If ghee is adulterated with other fats or oils (like vanaspati or vegetable oil), its refractive index will change. Thus, the instrument is a primary tool for checking the purity of ghee. This statement is correct.
B. B R reading of ghee: This is the direct measurement taken by the instrument. "BR reading" stands for Butyro-refractometer reading. This statement is inherently correct.
C. Fat content in milk: The fat content in milk is typically measured using methods like the Gerber method (centrifugation) or electronic milk analyzers, not a Butyro-refractometer. This statement is incorrect.
D. Vitamin content in milk: Vitamin content is measured using more sophisticated chemical analysis techniques like chromatography (HPLC), not by a refractometer. This statement is incorrect.
Therefore, the Butyro-refractometer is used to measure the BR reading of ghee, which in turn is used to determine its purity.
Step 3: Final Answer:
Statements A and B are correct. This corresponds to option (D).