Potentiometer sensitivity increased by: MCQ with Answer and Explanation

Explanation:
Hydrometer measures relative density. Lactometer for milk, but general is hydrometer.

Explanation:
T = 1/(2×10⁶) = 0.5×10⁻⁶ s = 0.5 μs.

Explanation:
v_e = √(2GM/R): depends on planet's M and R, independent of projectile mass or launch direction. Memory tip: 'v_e ∝ √(M/R); property of planet, not projectile'. Gravitation concept frequently tested in competitive exams.