Simple Machines - Jamb Physics Past Questions and Answers

Question 26:

• JAMB 2007

A machine has a velocity ratio of 4. if it requires 800 N to overcome a load of 1600 N,what is the efficiency of the machine?

A. 60%
B. 50%
C. 40%
D. 2%

Question 27:

• JAMB 2008

The efficiency of the pulley system shown above is 80%. find the effort E required to lift the load of 1200N

A. 275N
B. 325N
C. 375N
D. 573N

Question 28:

• JAMB 2009

If a heavy barrel is rolled up a plane inclined at 30° to the horizontal. its velocity ratio will be

A. 3.0
B. 3.1
C. 3.2
D. 2.0

Question 29:

• JAMB 2010

A machine of velocity ratio 6 requires an effort of 400 N to raise a load of 800 N through I m. Find the efficiency of the machine

A. 55. 6 %
B. 50.0%
C. 33.3%
D. 22.2%

Question 30:

• JAMB 2010

A machine of velocity ratio 6 requires an effort of 400 N to raise a load of 800 N through I m. Find the efficiency of the machine

A. 55. 6 %
B. 50.0%
C. 33.3%
D. 22.2%