The escape velocity of a body from Earth is v_e. If Earth's radius shrinks to 1/4th keeping mass constant, escape velocity becomes MCQ with Answer and Explanation

Explanation:
Rayleigh scattering by air molecules, shorter wavelengths (blue) scattered more.

Explanation:
Gauge pressure (excluding atmospheric) P_gauge = ρgh ∝ h. Doubling depth doubles gauge pressure. Total pressure P = P₀ + ρgh increases but not exactly double due to P₀ term. Question asks about pressure increase (ρgh part). Memory tip: 'Hydrostatic pressure ∝ depth'. Fundamental fluid statics concept frequently tested in competitive exams.

Explanation:
At C (centre of curvature), image is at C, real, inverted, same size. At F, image at infinity. Beyond C, between F and C, diminished. Object between F and C gives beyond C, enlarged.