Test for Adulteration in Milk

Q.

How do you test for the presence of starch in a food item? [5 MARKS]

Q. What reading can a lactometer show for the milk adulterated with water?

1. 20
2. 35
3. 16
4. 0

Q.

Question 1
Given below from (i) to (iv) are some food items.
(i) Boiled and mashed potato
(ii) Glucose solution
(iii) A slice of bread
(iv) Mustard oil
Which of the above will give a blue-black color when tested with iodine?
(a) (i) and (ii)
(b) (i) and (iii)
(c) (ii) and (iii)
(d) (iii) and (iv)

Q.

Study the two statements labelled as Assertion (A) and Reason (R).

Assertion (A) : Iodine when added in milk, changes milk colour to dark blue.

Reason (R) : Starch is present in milk.

1. Both (A) and (R) are true and (R) is the correct explanation of (A).
2. Both (A) and (R) are true and (R) is not the correct explanation of (A).
3. (A) is true and (R) is false.
4. (A) is false and (R) is true.

Q.

The ___ test is done to detect the presence of starch as an additive in milk.

Q.

What is used to detect the presence of water in milk?

1. Lactometer

2. Barometer

3. Thigmometer

4. Manometer

Q. The iodine test is carried out to detect the presence of ___ as an additive in milk.

Q.

How do we find out the quantity of water added to milk?

1. Sphygmomanometer

2. Lactometer

3. Dynamometer

4. Thermometer

Q.

How does pasteurisation work?

1. The cell membrane of the microorganisms ruptures due to sudden change in temperature

2. At a very high temperature, the microorganisms become inactive

3. At a very low temperature, the microorganisms become inactive

4. The nucleus of the microorganisms ruptures due to sudden change in temperature

Q.

Why is the gravity bulb of a commercial hydrometer for heavier liquids made heavy?

Q. Lactometer is used to check whether _____ is adulterated or not.

1. oil
2. sugar
3. milk
4. dal

Q.

Lactometer is based on

1. Bernoullis theorem

2. Archimedes principle

3. First law of thermodynamics

4. None

Q.

Which of the following is/are used for testing starch?

1. Iodine

2. Magnesium

3. Ammonia

4. Sodium

Q. Foods rich in starch turnsin colour, when treated with iodine solution.

1. orange
2. pink
3. green
4. blue-black

Q.

Lactometer is used to check whether _______ is adulterated or not.

1. oil

2. milk

3. sugar

4. dal

Q. Name the instrument used to detect the presence of water in milk.

1. Lactometer
2. Barometer
3. Manometer
4. Thigmometer

Q.

Iodine is used to test the presence of ___ .

1. salt

2. water

3. starch

4. colour

Q.

Iodine solution turned blue black when poured on a potato slice because it contains:

1. Fat

2. Starch

3. Protein

4. Oil

Q.

A Eureka can is a container with a spout near its top.

1. True
2. False

Q. The main purpose of dehydration of food is ______________.

1. To increase the microbial activity
2. To reduce the moisture content
3. To decrease the microbial activity
4. Both B and C

Q.

Determine the methods used to test for each of the following in milk.

Starch -	(A) _____
Detergent -	(B) _____
Urea -	(C) _____
Water -	(D) _____

1. A - Litmus test, B - Vigorous shaking, C - Iodine test, D - Lactometer

2. A - Vigorous shaking, B - Iodine test, C - Lactometer, D - Litmus test

3. A - Iodine test, B - Vigorous shaking, C - Litmus test, D - Lactometer

4. A - Iodine test, B - Lactometer, C - Litmus test, D - Vigorous shaking