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Wednesday, 15 April 2026
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Physics Past Questions and Answers

Topic: Mechanical advantage, velocity ratio and efficiency of machines

Jamb Physics Questions - Mechanical advantage, velocity ratio and efficiency of machines

Question 1:
An inclined plane of angle \(\theta\), acting as a simple machine, has a velocity ratio
  • A Sin\(\theta\)
  • B \(\frac{1}{\text{sin}\theta}\)
  • C Cos\(\theta\)
  • D \(\frac{1}{\text{cos}\theta}\)
  • E Sin\(\theta cos\theta\)
View Answer & Explanation
Question 2:
A machine has a velocity ratio of 5. It requires a 50kg weight to overcome a 200kg weight. The efficiency is
  • A 4%
  • B 5%
  • C 40%
  • D 50%
  • E 80%
View Answer & Explanation
Question 3:
fig 4 represents a block-and-tackle pulley system on which an effort of W newtons supports a load of 120.0N if the efficiency of the system is 40% then the value of W is
  • A 28.0N
  • B 48.0N
  • C 50.0N
  • D 288.0N
View Answer & Explanation
Question 4:
An inclined plane which makes an angle of 30o with the horizontal has a velocity ratio of
  • A 2
  • B 1
  • C 0.866
  • D 0.50
View Answer & Explanation
Question 5:
A plane inclined at angle \(\theta\) has a velocity ratio of 10 : 1. The inclination of the plane to the horizontal is given by
  • A Tan\(\theta\) = \(\frac{1}{10}\)
  • B Cot\(\theta\) = \(\frac{1}{10}\)
  • C Cos\(\theta\) = \(\frac{1}{10}\)
  • D Sin\(\theta\) = \(\frac{1}{10}\)
View Answer & Explanation