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PHYSICS

JAMB 2021 - Question 18

Physics 2021 JAMB Past Questions - Question 18: In any machine, (i) the velocity ratio is usually greater than the mechanical advantage (ii) the efficiency equals ratio of mechanical advantage to velocity ratio (iii) the velocity ratio is independent of friction. Which of the statement above is/are correct?

Choose the correct answers from the options given.

In any machine, (i) the velocity ratio is usually greater than the mechanical advantage (ii) the efficiency equals ratio of mechanical advantage to velocity ratio (iii) the velocity ratio is independent of friction. Which of the statement above is/are correct?

A: III only

B: . I and ii only

C: ii and iii only

D: . i, ii and iii

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Correct Answer

Explanation

The correct statement is (iii) the velocity ratio is independent of friction.