Chapter Exam

Chapter-3 Mass Weight and Density — Online MCQ Test

Q: Which of the following best defines mass?

Answer: B. The amount of matter contained in an object — Mass is a fundamental property that measures the amount of matter in an object, independent of gravitational field. Weight, by contrast, is the gravitational force acting on that mass.

Q: What is the SI unit of weight?

Answer: B. Newton (N) — Weight is a force and is measured in newtons (N). Mass is measured in kilograms, which is a different quantity.

Q: An astronaut has a mass of 80 kg on Earth. What will be her mass on the Moon?

Answer: A. 80 kg — Mass is an intrinsic property of matter and does not change with location. The astronaut's mass remains 80 kg on the Moon; only her weight would be different.

PHYSICS · Grade 10 · IGCSE cambridge

Practice Chapter-3 Mass Weight and Density with a free chapter-wise online MCQ test for IGCSE cambridge Grade 10 PHYSICS. This chapter covers: The difference between mass and weight and determining the density of solids and liquids.. AI-generated questions from basic to board-exam level, with instant results and explanations.

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Chapter-3 Mass Weight and Density — Important Questions & Answers (FAQ)

Frequently asked questions from IGCSE cambridge Grade 10 PHYSICS — Chapter-3 Mass Weight and Density, with answers and explanations. These are sample questions; the exam has its own separate question set.

Which of the following best defines mass?

A. The force exerted on an object due to gravity
B. The amount of matter contained in an object ✓
C. The weight of an object measured in newtons
D. The volume of space occupied by an object

Answer: B. The amount of matter contained in an object
Mass is a fundamental property that measures the amount of matter in an object, independent of gravitational field. Weight, by contrast, is the gravitational force acting on that mass.

What is the SI unit of weight?

A. Kilogram (kg)
B. Newton (N) ✓
C. Gram (g)
D. Pascal (Pa)

Answer: B. Newton (N)
Weight is a force and is measured in newtons (N). Mass is measured in kilograms, which is a different quantity.

An astronaut has a mass of 80 kg on Earth. What will be her mass on the Moon?

A. 80 kg ✓
B. 13.2 kg
C. 480 kg
D. Zero

Answer: A. 80 kg
Mass is an intrinsic property of matter and does not change with location. The astronaut's mass remains 80 kg on the Moon; only her weight would be different.

The gravitational field strength on Jupiter is approximately 25 m/s², compared to Earth's 10 m/s². If an object has a mass of 20 kg, which statement is true?

A. The object is heavier on Earth than on Jupiter
B. The object's mass increases on Jupiter
C. The object weighs 500 N on Jupiter and 200 N on Earth ✓
D. The object becomes denser on Jupiter

Answer: C. The object weighs 500 N on Jupiter and 200 N on Earth
Weight on Jupiter = 20 × 25 = 500 N; weight on Earth = 20 × 10 = 200 N. Mass remains constant, but weight changes with gravitational field strength.

A metallic sphere of radius 5 cm has a mass of 5.24 kg. If the density of the metal is 8400 kg/m³, which of the following best explains any discrepancy?

A. The sphere must be hollow or contain a cavity inside ✓
B. The measurement of radius is incorrect
C. The density value for the metal is wrong
D. The mass measurement instrument is faulty

Answer: A. The sphere must be hollow or contain a cavity inside
Expected mass = ρ × V = 8400 × (4/3)π(0.05)³ ≈ 44 kg, which is much greater than 5.24 kg. The discrepancy suggests the sphere is not solid but contains internal voids.