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Question (21)

QN005262

Appearance of a violet or purple colour in the protein test indicates the presence of:

(A) Fat
(B) Starch
(C) Protein
(D) Water

Correct Answer: C

Explanation:

Violet colour confirms the presence of protein.

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Question (22)

QN005263

Egg white gives a positive result in the protein test because it is rich in:

(A) Fat
(B) Protein
(C) Starch
(D) Roughage

Correct Answer: B

Explanation:

Egg white contains a large amount of protein.

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Question (23)

QN005264

Which reagent is added first in the protein test?

(A) Iodine solution
(B) Copper sulphate solution
(C) Lemon juice
(D) Water

Correct Answer: B

Explanation:

Copper sulphate solution is added before caustic soda.

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Question (24)

QN005265

Which colour change indicates a positive protein test?

(A) Blue-black
(B) Green
(C) Violet
(D) Yellow

Correct Answer: C

Explanation:

Violet colour indicates protein.

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Question (25)

QN005266

A student tests milk with copper sulphate and caustic soda. A violet colour appears. What can be inferred?

(A) Milk contains starch
(B) Milk contains protein
(C) Milk contains iodine
(D) Milk contains no nutrients

Correct Answer: B

Explanation:

Violet colour confirms protein in milk.

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Question (26)

QN005267

Which food sample is most likely to show positive results for both protein and fat tests?

(A) Butter
(B) Egg
(C) Sugar
(D) Potato

Correct Answer: B

Explanation:

Egg contains both protein and fat.

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Question (27)

QN005268

If a food sample shows blue-black colour with iodine and no translucent patch on paper, it most likely contains:

(A) Starch but little fat
(B) Fat but no starch
(C) Protein only
(D) Water only

Correct Answer: A

Explanation:

Blue-black colour shows starch; absence of translucent patch indicates little or no fat.

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Question (28)

QN005269

A student obtains a violet colour and a translucent patch from the same food sample. Which nutrients are present?

(A) Starch and water
(B) Protein and fat
(C) Protein and starch
(D) Fat and starch only

Correct Answer: B

Explanation:

Violet colour indicates protein and translucent patch indicates fat.

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Question (29)

QN005270

Which of the following foods is expected to test positive for starch but negative for fat?

(A) Rice
(B) Butter
(C) Cooking oil
(D) Ghee

Correct Answer: A

Explanation:

Rice contains starch but very little fat.

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Question (30)

QN005271

A food sample gives negative results in starch, fat and protein tests. Which substance is most likely the sample?

(A) Sugar solution
(B) Egg white
(C) Groundnut paste
(D) Butter

Correct Answer: A

Explanation:

Sugar solution does not give positive results in these tests.

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Question (21)

Appearance of a violet or purple colour in the protein test indicates the presence of:

Explanation:

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Question (22)

Egg white gives a positive result in the protein test because it is rich in:

Explanation:

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Question (23)

Which reagent is added first in the protein test?

Explanation:

Link:

Question (24)

Which colour change indicates a positive protein test?

Explanation:

Link:

Question (25)

A student tests milk with copper sulphate and caustic soda. A violet colour appears. What can be inferred?

Explanation:

Link:

Question (26)

Which food sample is most likely to show positive results for both protein and fat tests?

Explanation:

Link:

Question (27)

If a food sample shows blue-black colour with iodine and no translucent patch on paper, it most likely contains:

Explanation:

Link:

Question (28)

A student obtains a violet colour and a translucent patch from the same food sample. Which nutrients are present?

Explanation:

Link:

Question (29)

Which of the following foods is expected to test positive for starch but negative for fat?

Explanation:

Link:

Question (30)

A food sample gives negative results in starch, fat and protein tests. Which substance is most likely the sample?

Explanation:

Link:

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