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

Which of the following machines does not apply the lever principle? (WASSCE 2020)

A. Claw hammer
B. Wheel barrow
C. Single pulley
D. Sugar tong

A 90 cm uniform lever has a load of 30N suspended at 15cm from one of its ends. If the fulcrum is at the centre of gravity, the force that must be applied at its other end to keep it in horizontal equilibrium is _____

(a) 15 N     (b) 20 N    (c) 30 N     (d) 60 N

The efficiency of a wheel and axle is 100% and the ratio of their radii is 5:1. Calculate the effort required to lift a load of mass 20 kg using this machine. [g = 10ms^-2] (WASSCE 2022)

A. 20 N    B. 25 N    C. 40 N    D. 100 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

I. Work done by load is always less than the work done by effort
II. All machines are made of lever pulleys, screws gear and wheels
III. A fishing rod is a machine
IV. Effort is always larger than load.

Which of the statements above about machines are true? (UTME 2006)

(a) I and II
(b) III and IV
(c) I and III
(d) II and III