Atom's nucleus contains: MCQ with Answer and Explanation

Explanation:
Snell's law: n₁ sin i = n₂ sin r. 1×0.5 = 1.5 sin r => sin r = 0.5/1.5 = 1/3 ≈ 0.3333 => r ≈ 19.47°. So A.

Explanation:
Bernoulli's principle states that an increase in the speed of a fluid occurs simultaneously with a decrease in pressure. Airplane wings (airfoils) are shaped so that air travels faster over the curved top surface than the flat bottom. This creates lower pressure above the wing and higher pressure below, resulting in an upward lift force.

Explanation:
a = constant ⇒ v = u + at (linear in t). Slope = acceleration. Memory tip: 'v-t slope = acceleration; area = displacement'. Graph interpretation frequently tested in competitive kinematics sections.