Simple Machines - Jamb Physics Past Questions and Answers

Question 41:

• JAMB 2016

Which of the following statements is correct about a machine?

A. Efficiency of a machine is always greater than I
B. Efficiency decreases with an increase in friction
C. Velocity ratio depends on friction
D. Mechanical advantage increases with an increase in friction

Question 42:

• JAMB 2017

A block and tackle pulley arrangement has 6 pulleys in which an effort of 50N supports a load of 200N, calculate the efficiency of the machine

A. 80.0%
B. 76.6%
C. 66.7%
D. 60.7%

Question 43:

• JAMB 2017

A block and tackle pulley arrangement has 6 pulleys in which an effort of 50N supports a load of 200N, calculate the efficiency of the machine

A. 80.0%
B. 76.6%
C. 66.7%
D. 60.7%

Question 44:

• JAMB 2017

The velocity ratio of an inclined plane where angle of inclination in θ is

A. Sinθ
B. Cosθ
C. Tanθ
D. \(\frac{1}{\sin \theta}\)

Question 45:

• JAMB 2018

The diagram shown 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 machine is 40, then the value of W is?

A. 28.0
B. 48.0N
C. 233.0N
D. 50.0N