Which of the following is a good conductor of heat? MCQ with Answer and Explanation

Explanation:
At resonance frequency ω₀ = 1/√(LC), inductive reactance X_L = ωL equals capacitive reactance X_C = 1/(ωC), so they cancel. Impedance Z = √[R² + (X_L - X_C)²] = R, which is minimum (since R is the only remaining component). Current is maximum at resonance. Memory tip: 'LCR resonance: Z_min = R, I_max, purely resistive'. This AC circuit concept is frequently tested in competitive exams. Always distinguish series resonance (Z min) from parallel resonance (Z max) behavior.

Explanation:
Acceleration phase: s₁ = ½a t² = ½×2×100 = 100 m, v = a t = 20 m/s. Constant velocity phase: s₂ = v×t = 20×10 = 200 m. Total = 300 m. Motion in two parts.

Explanation:
Weight W = mg. On Earth: 10×10 = 100 N. On Moon: g_moon ≈ 10/6 ≈ 1.67 m/s². W_moon = 10×1.67 ≈ 16.7 N. Mass remains 10 kg; weight changes with gravity. Memory tip: 'Mass constant; weight ∝ g'. Tests mass-weight distinction and gravity variation, common conceptual question in competitive exams.