Which physical law explains the generation of lift force on an airplane wing? MCQ with Answer and Explanation

Which physical law explains the generation of lift force on an airplane wing?

A. Bernoulli's Principle

B. Boyle's Law

C. Archimedes' Principle

D. Pascal's Law

Answer: Option A

Solution (By JKExamLibrary)

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.

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Question #1 Report Error

Why does a metal spoon feel colder than a wooden spoon when left in a cold room, despite both being at the same room temperature?

A. Metal is a better conductor of heat than wood.

B. The specific heat of metal is higher than that of wood.

C. Metal is a poorer conductor of heat than wood.

D. Metal absorbs coldness from the air faster.

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Correct Answer: Option A

Explanation:
Both spoons are at the same temperature. However, metal is a good conductor of heat. When you touch it, it rapidly conducts heat away from your hand, making your skin feel a sudden drop in temperature (which you perceive as 'cold'). Wood is a poor conductor, so it draws heat from your hand very slowly.

This question belongs to: Science Physics