Mass vs Weight — Homi Bhabha Exam Physics MCQs with Solutions
Free Homi Bhabha Exam Physics Mass vs Weight MCQs with step-by-step solutions (6 questions). Part of Gravitation & Pressure. Practise online on Prepizo — no login needed.
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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.