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

Hello and Welcome to Physics Practice Test – Machines

1. You are to attempt 5 random objectives questions ONLY.
2. Supply Your Full Name and Location in the text box below and begin immediately.
3. You can attempt as many times as possible.
1.

The velocity ratio of an inclined plane, inclined at an angle θ to the horizontal can be expressed as _____ (WASSCE 2006)

A. (sin θ)-1    B. sin θ     C. (cos θ)     D. cos θ

2.

The diagram above illustrates a block and tackle pulley system in which an effort E supports a load of 100.0 N If the efficiency of the machine is 75 %, calculate the value of E. (WASSCE 2015)

A. 22.2 N     B. 38.0 N     C. 67.0 N    D. 75.0 N

3.

A motor of a corn mill machine operates on electrical energy of 1.44 x 105 J. If one-quarter of the energy is wasted in the form of sound and heat, determine the efficiency of the machine. (WASSCE 2017)

A. 25%    B. 36%    C. 64%    D. 75%

4.

The efficiency of a machine is always less than 100% because the ______

(a) velocity ratio is always greater than the mechanical advantage
(b) work output is always greater than the work input
(c) effort applied is always greater than the load lifted
(d) load lifted is always greater than the effort applied

5.

In an ideal wheel and axle system, R stands for the radius of the wheel and r is the radius of the axle. The mechanical advantage is _____ (UTME 2005)

(a) r/R    (b) R/r    (c) (R/r)2   (d) (r/R)2

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