A moving coil galvanometer can be converted into a voltmeter by connecting MCQ with Answer and Explanation

Explanation:
Dimensionless quantities: angle (radian = arc/radius), strain (ΔL/L), refractive index (ratio of speeds). All have [M⁰L⁰T⁰]. Memory aid: 'Ratios of same dimensions ⇒ dimensionless'. Dimensional analysis question frequently tested in competitive exams to identify dimensionless physical quantities.

Explanation:
Henry (H) = V·s/A = Ω·s.

Explanation:
Work = mgh = 2 × 10 × 5 = 100 J. Force = mg = 20 N, distance 5 m, work = 20 × 5 = 100 J. This becomes potential energy stored.