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Question (21)

QN004530

Why could Sara hide behind a frosted glass door but not behind a clear glass window?

(A) Frosted glass is opaque
(B) Frosted glass is translucent and does not show objects clearly
(C) Frosted glass is soluble in water
(D) Frosted glass is harder

Correct Answer: B

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Question (22)

QN004531

Which set contains only opaque materials?

(A) Wood, cardboard, metal
(B) Water, glass, air
(C) Butter paper, frosted glass, glass
(D) Cellophane paper, air, water

Correct Answer: A

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Question (23)

QN004532

Which of the following is transparent?

(A) Butter paper
(B) Frosted glass
(C) Window glass
(D) Wooden board

Correct Answer: C

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Question (24)

QN004533

A material through which objects can be seen but not clearly is called

(A) transparent
(B) translucent
(C) opaque
(D) lustrous

Correct Answer: B

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Question (25)

QN004534

Sugar disappears when stirred in water because it is

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

Correct Answer: C

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Question (26)

QN004535

Which of the following is insoluble in water?

(A) Salt
(B) Sugar
(C) Sand
(D) Lemon juice

Correct Answer: C

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Question (27)

QN004536

A student adds sugar, salt, chalk powder and sand separately to water. How many of these are expected to dissolve completely?

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

Correct Answer: B

Explanation:

Sugar and salt dissolve completely, while chalk powder and sand do not.

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Question (28)

QN004537

Which observation correctly indicates an insoluble material?

(A) It disappears completely in water
(B) It forms a clear solution
(C) It remains visible even after stirring for a long time
(D) It changes the colour of water

Correct Answer: C

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Question (29)

QN004538

Oxygen dissolved in water is important because it helps

(A) rocks grow
(B) aquatic plants and animals survive
(C) water become opaque
(D) sand dissolve

Correct Answer: B

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Question (30)

QN004539

Three identical cups are half-filled with water, sand and pebbles. Which property is being compared when they are weighed?

(A) Volume
(B) Transparency
(C) Mass
(D) Solubility

Correct Answer: C

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Question (21)

Why could Sara hide behind a frosted glass door but not behind a clear glass window?

Explanation:

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Question (22)

Which set contains only opaque materials?

Explanation:

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Question (23)

Which of the following is transparent?

Explanation:

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Question (24)

A material through which objects can be seen but not clearly is called

Explanation:

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Question (25)

Sugar disappears when stirred in water because it is

Explanation:

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Question (26)

Which of the following is insoluble in water?

Explanation:

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Question (27)

A student adds sugar, salt, chalk powder and sand separately to water. How many of these are expected to dissolve completely?

Explanation:

Link:

Question (28)

Which observation correctly indicates an insoluble material?

Explanation:

Link:

Question (29)

Oxygen dissolved in water is important because it helps

Explanation:

Link:

Question (30)

Three identical cups are half-filled with water, sand and pebbles. Which property is being compared when they are weighed?

Explanation:

Link:

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