Simple Machines - Jamb Physics Past Questions and Answers

Question 46:

• JAMB 2018

What effort will a machine of efficiency 90% apply to a load of 180N if its efforts arm is twice as long as its load arm?

A. 100N
B. 90N
C. 80N
D. 120N

Question 47:

• JAMB 2018

A pulley system has three pulleys in the fixed block and two in the movable block and if the pulley has an efficiency of 72%, the mechanical advantage of the system is?

A. 36.0
B. 7.2
C. 5.0
D. 3.6

Question 48:

• JAMB 2019

The pitch of a screw jack is 0.45cm and the arm is 60cm long. If the efficiency of the Jack is 75/Ï€ %, calculate the mechanical advantage.

A. 400
B. 300
C. 200
D. 150

Question 49:

• JAMB 2019

Calculate the velocity ratio of a screw jack of pitch 0.2cm if the length of the tommy bar is 23cm

A. 230\(\pi\)
B. 23\(\pi\)
C. 70\(\pi\)
D. 140\(\pi\)

Question 50:

• JAMB 2020

The figure above 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\(^o\), then the value of W is

A. 28.0N
B. 48.0N
C. 288.0N
D. 50.0N