Simple Machines - Jamb Physics Past Questions and Answers

Question 11:

• JAMB 1990

An inclined plane which makes an angle of 30^o with the horizontal has a velocity ratio of

A. 2
B. 1
C. 0.866
D. 0.50

Question 12:

• JAMB 1991

A wheel and axle have radii 80cm and 10cm respectively. If the efficiency of the machine is 0.85, an applied force of 1200N to the wheel will raise a load of

A. 8.0N
B. 6.8N
C. 8160N
D. 9600N

Question 13:

• JAMB 1991

A 20kg mass is to be pulled up a slope inclined at 30^o to the horizontal. If the efficiency of the plane is 75%, the force required to pull the load up the plane is [g = 10ms^-2]

A. 13.3N
B. 73.5N
C. 133.3N
D. 53.2N

Question 14:

• JAMB 1992

A machine requires 1000J of work to raise a load of 500N through a vertical distance of 1.5m. Calculate the efficiency of the

A. 80%
B. 75%
C. 50%
D. 33%

Question 15:

• JAMB 1993

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\(\theta\) = \(\frac{1}{10}\)