A body fully immersed in a fluid experiences an upward buoyant force equal to
A. Density of the body
B. Volume of the body
C. Weight of the fluid displaced
D. Weight of the body
Answer: Option C
Solution (By JKSSB Mock Tests)
Archimedes' principle: buoyant force = weight of fluid displaced. This force acts upward. If buoyant force ≥ weight, object floats. Submarines use ballast tanks to change weight, altering buoyancy.
Explanation:
a = constant ⇒ v = u + at (linear in t). Slope = acceleration. Memory tip: 'v-t slope = acceleration; area = displacement'. Graph interpretation frequently tested in competitive kinematics sections.
Explanation:
Sound requires material medium for mechanical wave propagation. Vacuum lacks particles to transmit vibrations. Light (EM wave) travels through vacuum. Memory tip: 'Sound = mechanical wave ⇒ needs medium; light = EM wave ⇒ no medium needed'. Fundamental wave property frequently tested in competitive exams to assess medium-dependence understanding.
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