Physics Practice Test – Machines (Questions with Answers & Explanations)

The mechanical advantage of a good machine is ____ (UTME 2022)

A. greater than 1
B. equal to 1
C. less than 1
D. greater than or equal to 1

A wheel and axle is used to raise a load whose weight is 800 N when an effort of 250 N is applied. If the radii of the wheel and axle are 800 mm and 200 mm respectively, the efficiency of the machine is _____ (UTME 2014)

A. 90%   B. 80%   C. 85%   D. 87%

The handle of a screw jack is 35 cm long and the pitch of the screw is 0.5 cm. What force must be applied at the end of the handle to lift a load of 2000 N if the efficiency of the jack is 30%? [π = 22/7] (WASSCE 2021)

A. 152.0 N      B. 132.0 N     C. 15.2 N     D. 440.0 N

A plane inclined at an angle of 30^o to the horizontal has an efficiency of 50%. The force parallel to the plane required to push a load of 500 N up the plane is ______ (UTME 2020)

A. 500 N     B. 1000 N     C. 250 N     D. 333.33 N

Which of the following statements is correct about a machine? (UTME 2016)

A. Efficiency of a machine is always greater than 1
B. Efficiency decreases with an increase in friction.
C. Velocity ratio depends on friction
D. Mechanical advantage increases with an increase in friction