A gun recoils on firing because of MCQ with Answer and Explanation

Explanation:
Vs/Vp = Ns/Np => Vs = 220 × (100/400) = 55 V. Step-down.

Explanation:
Violet ~400 nm, shortest in visible. Red ~700 nm, longest. Order VIBGYOR. Shorter wavelength higher frequency, more energy. Ultraviolet beyond violet.

Explanation:
Gravitational force acts vertically downward. For horizontal displacement, the angle between force and displacement is 90°, so work W = F·d·cos90° = 0. Gravity does no work for horizontal motion; it only does work for vertical displacement components. Memory aid: 'Work = F d cosθ; θ=90° ⇒ W=0'.