At the magnetic poles of the Earth, the angle of dip (inclination) is exactly: MCQ with Answer and Explanation

Explanation:
s = ut + ½at², u=0 => 9 = ½a(3)² => 9 = ½a×9 => a = 2 m/s².

Explanation:
Mercury has uniform thermal expansion, visible, high boiling point (357°C). Does not wet glass.

Explanation:
At boiling point, supplied heat (latent heat) breaks intermolecular bonds for phase change, not increasing kinetic energy (temperature). Potential energy increases while kinetic energy (temperature) stays constant. Memory aid: 'Latent heat changes state, not temperature'. Conceptual question testing phase change understanding, common in competitive exams to assess microscopic interpretation.