In a simple pendulum, the restoring force is provided by 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:
β⁻ decay: neutron → proton + electron, Z increases by 1.

Explanation:
Boiling point of water = 100°C = 100 + 273.15 = 373.15 K. Melting point of ice 0°C = 273.15 K. Kelvin is SI unit, no degree symbol.