Nigeria Universities – Polytechnics and College of Education news Nigerian Educational News | Zenith Of Educational News2012 WAEC PHYSICS EXPO:
waec 2012 physics theory Questions.
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This are the 2012 waec physics expo, the physics 2012 waec questions.
1.) Define(a)energy
(b)power
(c)work
(1b)An electric pump whose efficiency is 75% raises water to a height of 20cm.
If water is delivered at the rate of 450dm3 per minute,what is the power rating of the pumb?
(Mass of 1dm3 of water=1kg).
(1c)In what circumstances is a force said to do work?
(1cii) How is work done measured.
(1d) Briefly explain the conversion of mechanical energy in a pendulum bob.
(2)Sketch the graph of relation between the extension of a spiral spring and the load attached to it when it is gradually loaded up the elastic limit.
(2b)What is the physical significance of the area under the graph?
(2c)A spiral spring is 20cm long when at 10N.What is the length of the spring at 2N provided hooke’s law is obeyed.
(2d) State Hooke’s law of elasticity,thus,prove that F=ke.
3.) State the pressure law.
3b.) Explain how the following will affect the given mass of a substance.
(i)volume
(ii)pressure
(iii)temparature.
3d.) A given mass of gas at 303K is trapped in a tube of volume V.Calculate the temparature of the gas when the volume isreduced to two-thirds of its original value by applying pressure twice the original value
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