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Question (31)

QN005272

Why should clean droppers be used during food testing activities?

(A) To make colours brighter
(B) To avoid contamination of reagents
(C) To increase nutrient content
(D) To reduce testing time

Correct Answer: B

Explanation:

Clean droppers prevent mixing of chemicals.

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Question (32)

QN005273

A student accidentally mixes iodine with copper sulphate before testing. The result may become unreliable because:

(A) Reagents must be used separately for specific tests
(B) Starch disappears
(C) Protein converts to fat
(D) Water evaporates rapidly

Correct Answer: A

Explanation:

Each reagent is meant for a specific nutrient test.

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Question (33)

QN005274

Which activity skill is mainly developed while performing food tests?

(A) Observation and interpretation
(B) Memorisation only
(C) Story writing only
(D) Singing skills

Correct Answer: A

Explanation:

Food tests require careful observation and interpretation.

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Question (34)

QN005275

Sugar does not turn blue-black with iodine because sugar:

(A) Contains protein
(B) Does not contain starch
(C) Contains fat
(D) Contains iodine

Correct Answer: B

Explanation:

Iodine reacts only with starch.

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Question (35)

QN005276

Raman says, “All starches are carbohydrates but not all carbohydrates are starches.” Which food supports his statement?

(A) Sugar solution giving no blue-black colour with iodine
(B) Potato giving blue-black colour with iodine
(C) Butter leaving a translucent patch
(D) Egg showing violet colour

Correct Answer: A

Explanation:

Sugar is a carbohydrate but does not contain starch.

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Question (36)

QN005277

Iodine falls on a cotton sock and on a starched saree. The saree turns blue-black while the sock does not. The most likely reason is that:

(A) The saree contains starch used during starching
(B) Cotton destroys iodine
(C) The sock contains fat
(D) The saree contains protein

Correct Answer: A

Explanation:

Starch on the saree reacts with iodine.

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Question (37)

QN005278

A student wants to identify an unknown liquid suspected to be iodine solution. Which method is most suitable?

(A) Add it to starch-containing food and check for blue-black colour
(B) Heat it strongly
(C) Freeze it
(D) Mix it with oil

Correct Answer: A

Explanation:

Iodine produces a blue-black colour with starch.

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Question (38)

QN005279

Which statement best explains the role of food-testing activities in science?

(A) They help verify the presence of nutrients experimentally
(B) They replace balanced diets
(C) They increase nutrient content
(D) They preserve food items

Correct Answer: A

Explanation:

Food tests provide experimental evidence of nutrients.

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Question (39)

QN005280

Why is it important to test food samples rather than guess their nutrient content?

(A) Appearance alone may be misleading
(B) Nutrients are visible directly
(C) All foods contain identical nutrients
(D) Food colour always reveals nutrients

Correct Answer: A

Explanation:

Scientific testing is more reliable than appearance.

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Question (40)

QN005281

A student tests a sample and obtains: blue-black colour with iodine, no translucent patch, and no violet colour. Which nutrient is definitely present?

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

Correct Answer: C

Explanation:

Blue-black colour confirms the presence of starch.

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Question (31)

Why should clean droppers be used during food testing activities?

Explanation:

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Question (32)

A student accidentally mixes iodine with copper sulphate before testing. The result may become unreliable because:

Explanation:

Link:

Question (33)

Which activity skill is mainly developed while performing food tests?

Explanation:

Link:

Question (34)

Sugar does not turn blue-black with iodine because sugar:

Explanation:

Link:

Question (35)

Raman says, “All starches are carbohydrates but not all carbohydrates are starches.” Which food supports his statement?

Explanation:

Link:

Question (36)

Iodine falls on a cotton sock and on a starched saree. The saree turns blue-black while the sock does not. The most likely reason is that:

Explanation:

Link:

Question (37)

A student wants to identify an unknown liquid suspected to be iodine solution. Which method is most suitable?

Explanation:

Link:

Question (38)

Which statement best explains the role of food-testing activities in science?

Explanation:

Link:

Question (39)

Why is it important to test food samples rather than guess their nutrient content?

Explanation:

Link:

Question (40)

A student tests a sample and obtains: blue-black colour with iodine, no translucent patch, and no violet colour. Which nutrient is definitely present?

Explanation:

Link:

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