Free WAEC Physics OBJ, theory/essay questions and answer for 2017 may/June expo
Verified Physics obj
SECTION A ANS 5QUESTION
decrease in height (h)
increase in time (t)
this shows that distance changes with time
given that U=15m3^-1
Using hooke’s law
by increasing the density mosquitoes lavrva than the density of water
A)Energy efficient- so far the best light for interior lighting
B)Low production cost (of tubes, not of the ballasts)
C)Long life of tubes
i)It requires low voltage sources for it to function
ii)It cannot be easily broken
iii)It is cheaper and quite easy to manufacture
If their distance and masses are doubled their corresponding force would also be doubled and the work done respectively
I.e.Workdone=Force * distance
Force= Mass * Acceleration
W= Mg * d
-Acceleration due to gravity
– At maximum height, final velocity is zero
i)pushing someone on a swing.
ii)Tuning a radio to a particular frequency.
A wave front is an imaginary surface passing through the points of a medium oscillatory in phase
SECTION B ANS 3 QUESION
Nuclear fission is a nuclear reaction in which a heavy nucleus splits spontaneously or on impact with another particle, with the release of energy.
A graphite reactor is a nuclear reactor that uses carbon as a neutron moderator, which allows un-enriched uranium to be used as nuclear fuel.
Boron rods are used in
nuclear reactors to control the fission rate of uranium and plutonium. They are composed of chemical elements such as boron, silver, indium and cadmium that are capable of absorbing many neutrons without themselves fissioning.