A body of weight 20 N is immersed in water, apparent loss in weight is 5 N. Buoyant force is MCQ with Answer and Explanation

Explanation:
Maximum binding energy/nucleon ≈ 8.8 MeV at iron-56, making it most stable. Lighter nuclei release energy via fusion; heavier via fission. Memory tip: 'Iron peak: most stable nucleus; fusion before, fission after'. Nuclear physics concept frequently tested in competitive exams.

Explanation:
Scientific notation: 3.00 has three significant figures (3,0,0). Exponent part not counted. It's a clear way to show precision. 3×10⁸ has 1, 3.0×10⁸ has 2.

Explanation:
Geostationary: orbit period = Earth's rotation period (24 h), equatorial plane, appears fixed. Orbital radius ≈ 42,000 km from Earth center. Memory tip: 'Geostationary: T=24h, equatorial, fixed position; communication satellites'. Orbital mechanics fact frequently tested in competitive exams.