If the momentum of a body is increased by 50%, what will be the percentage increase in its kinetic energy? MCQ with Answer and Explanation

Explanation:
SONAR uses ultrasonic waves (>20 kHz) for better directionality, resolution, and reduced absorption in water. Audible sound (20Hz-20kHz) diffracts more; infrasonic (

Explanation:
g = GM/R² = G (ρ 4/3 π R³)/R² ∝ ρ R. If radius half, density same, g becomes half. Weight half = 50 N.

Explanation:
For a bipolar junction transistor (BJT) in common-emitter configuration, DC current gain β = I_C / I_B, where I_C is collector current, I_B base current. Typical β values range 20-200. Option D is α (common-base gain). Memory tip: 'β = collector current / base current; large β means small base current controls large collector current'. This definition-based question tests electronics fundamentals, frequently examined in competitive exams. Always distinguish β (CE configuration) from α (CB configuration) and their relationship: β = α/(1-α).