Physics: Mechanics: UPSC Previous Year Questions (Science and Technology)
1 previous year UPSC Prelims question on Physics: Mechanics (Science and Technology). Choose an option to see the answer and explanation.
Explanations state facts as of the year each question was asked; words like “recently” refer to that year.
Showing 1–1 of 1 question
UPSC 2002Science and Technology · Physics: Mechanics
Q1. Assertion (A): An iron ball floats on mercury but gets immersed in water. Reason (R): The specific gravity of iron is more than that of mercury. Codes:
Explanation
Density is a measure of how much mass is packed into a given volume. Buoyancy is the tendency of an object to float in a fluid. An object floats if its density is less than the fluid’s density and sinks if its density is greater. If the densities are equal, the object remains neutrally buoyant, neither sinking nor floating. Assertion (A) is true: Iron is denser than water, so it sinks in water. However, mercury is denser than iron, so an iron ball will float on mercury. Reason (R) is false: Specific gravity is the ratio of the density of a substance to the density of a reference substance (usually water). Mercury is denser than iron, so its specific gravity is higher.
Answer key for these questions
Q
UPSC year
Correct answer
1
2002
(c) A is true but R is false
Frequently asked questions
How many previous year UPSC questions are there on Physics: Mechanics?
This page covers 1 previous year UPSC Prelims GS Paper-I questions on Physics: Mechanics (Science and Technology), asked from 1997 to 2004. Each has the correct answer and an explanation.
How should I use previous year UPSC questions for Prelims?
Attempt each question first, then open the answer and read the explanation for every option. Repeat by chapter, and track which statements UPSC reuses across years. Previous year questions show the exam pattern and difficulty level.
Which years are covered for Physics: Mechanics?
Questions on Physics: Mechanics (Science and Technology) are available for 7 years, from 1997 to 2004. Use the Year filter to practise a single paper.
