A piece of copper wire has resistance 10 Ω at 0°C. α = 0.004/°C. At 100°C resistance is MCQ with Answer and Explanation

Explanation:
Torricelli's Law is a direct application of Bernoulli's principle. It proves mathematically that the velocity of fluid exiting a small hole (efflux velocity v) is v = sqrt(2gh). This is exactly the same velocity a solid body would acquire if it fell freely under gravity from rest over the same vertical height 'h'.

Explanation:
Hydrostatic pressure P = P₀ + ρgh, where h is depth below free surface, ρ fluid density, g gravity. Pressure depends only on depth, not container shape, surface area, or total volume (Pascal's paradox). This is a fundamental result in fluid statics. Memory aid: 'Pressure increases linearly with depth'. Competitive exams often test this independence from container geometry to assess deep understanding versus misconceptions. Always recall that pressure is scalar and acts equally in all directions at a point in static fluid.

Explanation:
Pascal's law: pressure applied to confined fluid transmits equally. Force multiplication: F₂/F₁ = A₂/A₁. Small force on small area creates large force on large area. Memory aid: 'Pascal = pressure transmission; hydraulic advantage = area ratio'. Application question testing fluid mechanics principles, common in competitive exams linking theory to devices.