Mass vs Weight — Homi Bhabha Class 9 Physics MCQs with Solutions
Free Homi Bhabha Class 9 Physics Mass vs Weight MCQs with step-by-step solutions (10 questions). Part of Gravitation & Pressure. Practise online on Prepizo — no login needed.
▶ Practise Mass vs Weight online (free)
Questions with solutions
Q1 — Mass vs Weight · medium · theory
Which of the following statements is correct?
A. Weight is constant but mass changes
B. Mass is constant everywhere but weight can change from place to place ✓ Correct
C. Both change from place to place
D. Both mass and weight are constant everywhere
Solution: Mass (amount of matter) is fixed, while weight $= mg$ varies as g varies.
Q2 — Mass vs Weight · medium · numerical
The weight of a 10 kg body on Earth (taking $g = 10$ m/s²) is:
A. 10 N
B. 100 N ✓ Correct
C. 1000 N
D. 1 N
Solution: Weight $= mg = 10 \times 10 = 100$ N.
Q3 — Mass vs Weight · hard · numerical
A person has a mass of 60 kg. On the Moon (where $g = 1.6$ m/s²) his weight is:
A. 96 N ✓ Correct
B. 37.5 N
C. 60 N
D. 600 N
Solution: Weight on Moon $= mg = 60 \times 1.6 = 96$ N (mass stays 60 kg).
Q4 — Mass vs Weight · medium · theory
The SI units of mass and weight are respectively:
A. kilogram and newton ✓ Correct
B. newton and newton
C. newton and kilogram
D. kilogram and kilogram
Solution: Mass is measured in kg; weight, being a force, is measured in newtons.
Q5 — Mass vs Weight · hard · theory
A beam balance is used to measure mass and works the same everywhere, whereas a spring balance measures weight, because:
A. a beam balance compares masses while a spring balance responds to the force of gravity ✓ Correct
B. a spring balance measures mass directly
C. both measure the same quantity
D. a beam balance uses springs
Solution: A beam balance compares the unknown mass with standard masses (independent of g), while a spring balance reads the gravitational force (weight).
Q6 — Mass vs Weight · hard · numerical
A body weighs 490 N on Earth where $g = 9.8$ m/s². Its mass is:
A. 98 kg
B. 4802 kg
C. 490 kg
D. 50 kg ✓ Correct
Solution: Mass $= \dfrac{W}{g} = \dfrac{490}{9.8} = 50$ kg.
Q7 — Mass vs Weight · easy · theory
Which of the following quantities remains the same for a body everywhere in the universe?
A. Both mass and weight
B. Mass ✓ Correct
C. Weight
D. Neither mass nor weight
Solution: Mass is the amount of matter in a body and does not change with location. Weight depends on g and changes from place to place.
Q8 — Mass vs Weight · medium · numerical
The weight of a body on the Moon is about one-sixth of its weight on the Earth. If a body weighs 60 N on the Earth, its weight on the Moon is:
A. 360 N
B. 10 N ✓ Correct
C. 60 N
D. 6 N
Solution: Weight on the Moon is about 1/6 of the weight on Earth, so 60 N × 1/6 = 10 N. The mass of the body stays the same.
Q9 — Mass vs Weight · medium · theory
A boy has a mass of 50 kg on the Earth. When he travels to the Moon:
A. his mass decreases but his weight stays the same
B. his mass stays 50 kg but his weight decreases ✓ Correct
C. both his mass and weight decrease
D. both his mass and weight stay the same
Solution: Mass is constant everywhere, so it stays 50 kg. Weight = m × g, and g on the Moon is smaller, so his weight decreases.
Q10 — Mass vs Weight · hard · numerical
An object weighs 240 N on the Earth (g = 10 m/s²). What is its mass, and what would it weigh on a planet where g = 4 m/s²?
A. mass 24 kg and weight 240 N on the planet
B. mass 24 kg and weight 96 N on the planet ✓ Correct
C. mass 24 kg and weight 60 N on the planet
D. mass 96 kg and weight 24 N on the planet
Solution: Mass = W/g = 240/10 = 24 kg and is unchanged. On the planet, weight = m × g = 24 × 4 = 96 N.