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Waec 2017 Physics Obj And Theory Answers Posted – May/June Expo

==========================
Physics-Obj
1CAABADACCC
11BAADDCBADA
21CCBAAACBAB
31BCADDBBBAC
41BCDAADABCA
==========================
NOTE:SECTION A ANSWER 5 QUESTIONS
==========================
1)
decrease in height (h)
increase in time (t)
this shows that distance changes
with time
==========================
2)
given that U=15m3^-1
R=U* sqr2h/g
h=20m
g=10
R=15*sqr2*20/10
R=15*sqr40/10
R=15*sqr4
R=15*2=30m
R=30m
==========================
3)
i)Brownian motion
ii)Atomic size
iii)Expansion
==========================
4)
L1=14cm F1=4N,F2=6N
L2=4cm, Lo=?
Using hooke’s law
4/14-Lo*6/4-Lo
4(4-Lo)=6(14-Lo)
16-4Lo=64-6Lo
-4Lo+6Lo=64-16
2Lo=48
Lo=48/2
Lo=24Cm
=========================
5a)
i)force
ii)length
5b)
by increasing the density
mosquitoes lavrva than the
density of water
==========================
6)
i)Energy efficient- so far the best
light for interior lighting
ii)Low production cost (of tubes,
not of the ballasts)
iii)Long life of tubes
==========================
7ai)It requires low voltage sources
for it to function
ii)It cannot be easily broken
iii)It is cheaper and quite easy to
manufacture
==========================
NOTE:SECTION B ANSWER ONLY 3 QUESTIONS
==========================
12ai)
Nuclear fission is a nuclear
reaction in which a heavy nucleus
splits spontaneously or on impact
with another particle, with the
release of energy.
12aii)
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.
12aiii)
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.
==========================
8b)
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
|
Increase
8c)
-Acceleration due to gravity
– At maximum height, final
velocity is zero
8d)
i)pushing someone on a swing.
ii)Tuning a radio to a particular
frequency.
==========================
10a)
A wave front is an imaginary
surface passing through the points
of a medium oscillatory in phase
10b)
i)Priam periscope used in harmod
car
ii)prismatic bihocular to see round
corner
10bii)
i)refractive indege of the glass
prism
ii)the angle of incident of the roy
=========================
Completed.

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Adeyemo Adewale Ayomide is the founder and editor of MyEduJobNews. He loves to share education news from various sources to keep readers informed.

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About Author

Myedujobnews Official

Adeyemo Adewale Ayomide is the founder and editor of MyEduJobNews. He loves to share education news from various sources to keep readers informed.

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