Sound resonance used in: MCQ with Answer and Explanation

Explanation:
Hydrometer floats based on density, uses buoyancy principle.

Explanation:
Werner Heisenberg, a German theoretical physicist, published his famous Uncertainty Principle in 1927. The principle dictates a fundamental limit to precision at the quantum level: the more precisely the position of a particle (like an electron) is determined, the less precisely its momentum can be known, and vice versa. Mathematically, delta_x * delta_p >= h/(4pi).

Explanation:
Object reflects that colour and absorbs others.