Which of the following statements about matter is correct?
A. All matter is composed of particles.
B. Matter cannot change its state.
C. Matter is always visible to the naked eye.
D. Gases do not have mass.
Answer: Option A
Solution (By JKSSB Mock Tests)
All matter is composed of tiny particles (atoms, molecules, or ions). This is a fundamental concept. Matter may not always be visible (e.g., air). It can change states (solid, liquid, gas). Gases have mass; for example, a filled gas cylinder weighs more than an empty one. The particulate nature of matter explains diffusion, Brownian motion, etc.
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