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Q93 (CDS-I/2003) Science & Technology › Basic Science (Physics, Chemistry, Biology) › Basic mechanics concepts Answer Verified

Assertion: When a piece of rock is brought from the moon to the earth, its mass changes. Reason (R) : The gravitational pull of earth is stronger than that of moon.

Result
Your answer: —  Â·  Correct: D
Explanation

The assertion is false because mass is an intrinsic property of an object that represents the amount of matter it contains and remains constant regardless of location [c1, t7]. When a rock is moved from the moon to the earth, its mass does not change [c1, c3]. However, weight is the measure of the gravitational force acting on an object and varies based on the local gravitational field [c1, t7]. The reason is true because the Earth's gravitational pull is significantly stronger than that of the moon; specifically, the moon's gravitational acceleration is approximately 1.62 m/s², which is about one-sixth of Earth's 9.8 m/s² [t2, t3, t4]. Consequently, while the rock's mass remains invariant, its weight would increase upon being brought to Earth due to the stronger gravitational pull [c1, t1].

Sources

  1. [1] Science ,Class VIII . NCERT(Revised ed 2025) > Chapter 5: Exploring Forces > A step further > p. 75
  2. [2] Science ,Class VIII . NCERT(Revised ed 2025) > Chapter 5: Exploring Forces > Prepare some questions based on your learnings so far ... > p. 78
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