Simple Machines - Jamb Physics Past Questions and Answers

Question 36:

• JAMB 2014

A machine whose efficiency is 75% is used to lift a load of 1000N. Calculate the effort put in to the machine if it has a Velocity ratio of 4.

A. 343.32N
B. 233.33N
C. 333.33N
D. 334.33N

Question 37:

• JAMB 2014

A wheel and an axle is used to raise a load whose weight is 800N when an effort of 250N is applied. If the radii of the wheel and axle are 800mm and 200mm respectively, the efficiency of the machine is

A. 90%
B. 80%
C. 85%
D. 87%

Question 38:

• JAMB 2015

What is the relationship mechanical advantage (MA) velocity Ratio (V.R) and efficiency with percentage?

A. E = M.A/V.R à— 100 %
B. M.A = E.V.R
C. V.R = 1 ෠sin θ M.A
D. M.A = 1/E à— 100%

Question 39:

• JAMB 2015

If the velocity ratio of a machine is 5. What is its ratio of x and y?

A. 2 : 5
B. 1 : 5
C. 5 : 1
D. 3 : 1

Question 40:

• JAMB 2015

If the mechanical advantage of a machine is 4. What is its ratio for LOAD to EFFORT?

A. 4:01
B. 1:04
C. 5:01
D. 2:01