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Question (31)

QN0029163

A material has density 0.4 g/cm³. Compared to water, it is:

(A) denser
(B) less dense
(C) equally dense
(D) impossible to compare

Correct Answer: B

Explanation:

Its density is lower than water.

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Question (32)

QN0029164

A cube has side 5 cm and mass 150 g. Its density is:

(A) 0.8 g/cm³
(B) 1.0 g/cm³
(C) 1.2 g/cm³
(D) 1.5 g/cm³

Correct Answer: C

Explanation:

Volume = 125 cm³; Density = 150 ÷ 125 = 1.2 g/cm³.

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Question (33)

QN0029165

Which of the following would definitely float in water?

(A) Density 1.3 g/cm³
(B) Density 1.1 g/cm³
(C) Density 1.0 g/cm³
(D) Density 0.7 g/cm³

Correct Answer: D

Explanation:

Density less than water causes floating.

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Question (34)

QN0029166

A solid has density 2 g/cm³ and volume 100 cm³. Its mass is:

(A) 50 g
(B) 100 g
(C) 150 g
(D) 200 g

Correct Answer: D

Explanation:

Mass = Density × Volume = 2 × 100 = 200 g.

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Question (35)

QN0029167

Why does an empty plastic bottle float more easily than the same bottle filled with sand?

(A) Its average density is lower
(B) Plastic changes water density
(C) Sand dissolves in water
(D) Volume becomes zero

Correct Answer: A

Explanation:

The empty bottle has lower average density.

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Question (36)

QN0029168

An object has mass 96 g and volume 120 cm³. Its density is:

(A) 0.6 g/cm³
(B) 0.8 g/cm³
(C) 1.0 g/cm³
(D) 1.2 g/cm³

Correct Answer: B

Explanation:

Density = 96 ÷ 120 = 0.8 g/cm³.

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Question (37)

QN0029169

Which object is least likely to float in water?

(A) Density 0.3 g/cm³
(B) Density 0.7 g/cm³
(C) Density 1.2 g/cm³
(D) Density 0.9 g/cm³

Correct Answer: C

Explanation:

Density greater than water causes sinking.

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Question (38)

QN0029170

A substance has density 0.25 g/cm³. If its volume is 400 cm³, its mass is:

(A) 50 g
(B) 75 g
(C) 100 g
(D) 125 g

Correct Answer: C

Explanation:

Mass = 0.25 × 400 = 100 g.

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Question (39)

QN0029171

A body has mass 500 g and volume 1000 cm³. What will happen when placed in water?

(A) Sink
(B) Float
(C) Remain exactly suspended
(D) Dissolve

Correct Answer: B

Explanation:

Density = 500 ÷ 1000 = 0.5 g/cm³, which is less than water.

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Question (40)

QN0029172

Which conclusion best explains why some objects float while others sink?

(A) Floating depends only on size
(B) Floating depends only on mass
(C) Floating depends mainly on comparison of density with water
(D) Floating depends only on shape

Correct Answer: C

Explanation:

Objects float or sink depending on their density relative to water.

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Question (31)

A material has density 0.4 g/cm³. Compared to water, it is:

Explanation:

Link:

Question (32)

A cube has side 5 cm and mass 150 g. Its density is:

Explanation:

Link:

Question (33)

Which of the following would definitely float in water?

Explanation:

Link:

Question (34)

A solid has density 2 g/cm³ and volume 100 cm³. Its mass is:

Explanation:

Link:

Question (35)

Why does an empty plastic bottle float more easily than the same bottle filled with sand?

Explanation:

Link:

Question (36)

An object has mass 96 g and volume 120 cm³. Its density is:

Explanation:

Link:

Question (37)

Which object is least likely to float in water?

Explanation:

Link:

Question (38)

A substance has density 0.25 g/cm³. If its volume is 400 cm³, its mass is:

Explanation:

Link:

Question (39)

A body has mass 500 g and volume 1000 cm³. What will happen when placed in water?

Explanation:

Link:

Question (40)

Which conclusion best explains why some objects float while others sink?

Explanation:

Link:

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