The weight of a body on moon is 1/6 of its weight on Earth. If a person weighs 60 kg on Earth, mass on moon is MCQ with Answer and Explanation

Explanation:
According to Archimedes' principle, the floating ice displaces a volume of water equal to its own weight. When the ice melts, it transforms into a volume of water that is exactly equal to the volume of water it displaced while floating. Therefore, the water level remains unchanged.

Explanation:
Soft iron has high permeability, low retentivity, easily magnetized and demagnetized.

Explanation:
β ∝ 1/d. If d' = 2d, β' = β/2. Fringe width decreases with increased slit separation. Memory aid: 'β ∝ 1/d; wider slit separation ⇒ narrower fringes'. Wave optics proportionality frequently tested in competitive exams.