The work done by a conservative force acting on a particle moving around any closed path is: MCQ with Answer and Explanation

Explanation:
KE ∝ p² (since KE = p²/(2m)). If KE increases by 300%, new KE = 4× original KE. Thus p_new² / p_original² = 4 ⇒ p_new / p_original = 2 ⇒ momentum doubles, i.e., 100% increase. Memory tip: 'KE ∝ p²; so %Δp = ½ %ΔKE for small changes, but for large changes use ratio'. This proportional reasoning problem tests energy-momentum relationship, frequently appearing in competitive exams. Always derive from fundamental relations when percentages are large; linear approximations fail here.

Explanation:
A rectifier is an electrical device composed of one or more diodes that allows current to flow only in one direction. Its primary function is to convert Alternating Current (AC), which periodically reverses direction, into Direct Current (DC), which flows in only one direction. The reverse process (DC to AC) is done by an inverter.

Explanation:
Rocket propulsion: momentum of exhaust gases equals momentum gained by rocket.