Carnot efficiency depends on: MCQ with Answer and Explanation

Explanation:
Pascal (Pa) named after Blaise Pascal, derived unit for pressure (N/m²). Metre, kilogram, second are base units. Joule, watt, newton, hertz, coulomb also named scientists.

Explanation:
Magnetic field lines represent direction of force on an isolated north pole. They emerge from north and enter south. They never cross. Tangent gives field direction. Compass aligns along these lines.

Explanation:
Polarization requires transverse waves. Sound in air is longitudinal (oscillations ∥ propagation) ⇒ cannot be polarized. EM waves (light, radio, X-rays) are transverse ⇒ can be polarized. Memory tip: 'Polarization ⇒ transverse only; sound = longitudinal ⇒ no polarization'. Wave property frequently tested in competitive exams.