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Question (21)

QN004610

A student adds four substances separately to water: salt, sugar, sand and chalk powder. How many dissolve completely?

(A) 1
(B) 2
(C) 3
(D) 4

Correct Answer: B

Explanation:

Salt and sugar dissolve completely.

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Question (22)

QN004611

Which observation indicates that a material is insoluble in water?

(A) It disappears completely
(B) It forms a clear solution
(C) It remains visible after stirring
(D) It changes colour

Correct Answer: C

Explanation:

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Question (23)

QN004612

Vinegar mixed with water forms a uniform mixture because vinegar is

(A) soluble in water
(B) opaque
(C) hard
(D) translucent

Correct Answer: A

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Question (24)

QN004613

Which pair consists of substances that are soluble in water?

(A) Sugar and salt
(B) Sand and sawdust
(C) Chalk powder and sand
(D) Sawdust and salt

Correct Answer: A

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Question (25)

QN004614

A student mixes 5 substances with water. Three dissolve completely and two do not. How many are insoluble?

(A) 1
(B) 2
(C) 3
(D) 5

Correct Answer: B

Explanation:

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Question (26)

QN004615

Dissolved oxygen in water is important because it supports

(A) pottery making
(B) aquatic life
(C) rusting only
(D) evaporation

Correct Answer: B

Explanation:

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Question (27)

QN004616

Which property is most useful for separating sugar from sand using water?

(A) Colour difference
(B) Difference in hardness
(C) Difference in solubility
(D) Difference in lustre

Correct Answer: C

Explanation:

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Question (28)

QN004617

Which of the following pairs contains one soluble and one insoluble substance?

(A) Sugar and salt
(B) Sand and chalk powder
(C) Sugar and sand
(D) Salt and glucose

Correct Answer: C

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Question (29)

QN004618

The amount of matter present in an object is called

(A) volume
(B) mass
(C) transparency
(D) hardness

Correct Answer: B

Explanation:

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Question (30)

QN004619

Which unit is commonly used to measure mass?

(A) litre
(B) millilitre
(C) kilogram
(D) metre

Correct Answer: C

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Question (21)

A student adds four substances separately to water: salt, sugar, sand and chalk powder. How many dissolve completely?

Explanation:

Link:

Question (22)

Which observation indicates that a material is insoluble in water?

Explanation:

Link:

Question (23)

Vinegar mixed with water forms a uniform mixture because vinegar is

Explanation:

Link:

Question (24)

Which pair consists of substances that are soluble in water?

Explanation:

Link:

Question (25)

A student mixes 5 substances with water. Three dissolve completely and two do not. How many are insoluble?

Explanation:

Link:

Question (26)

Dissolved oxygen in water is important because it supports

Explanation:

Link:

Question (27)

Which property is most useful for separating sugar from sand using water?

Explanation:

Link:

Question (28)

Which of the following pairs contains one soluble and one insoluble substance?

Explanation:

Link:

Question (29)

The amount of matter present in an object is called

Explanation:

Link:

Question (30)

Which unit is commonly used to measure mass?

Explanation:

Link:

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