A tuning fork of frequency 256 Hz is sounded. In 1 second, number of compressions produced is MCQ with Answer and Explanation

Explanation:
Newton's law: F = Gm₁m₂/r² ⇒ F ∝ 1/r². Inverse square law fundamental to gravitation, electrostatics, and radiation intensity. Memory aid: 'Gravity weakens with square of distance; double distance ⇒ force becomes 1/4'. Core concept frequently tested to verify understanding of fundamental force laws in competitive exams.

Explanation:
Real inverted image, brain interprets as erect.

Explanation:
Resonance: ωL = 1/(ωC) ⇒ ω = 1/√(LC). At this frequency, impedance minimum (Z=R), current maximum. Memory tip: 'Resonance: X_L = X_C; series: Z_min, current max'. AC circuit concept frequently tested in competitive exams.