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WAEC 2017: 100% Verified Physics Questions & Answers
WAEC April 8, 2017 • 4 years ago • One Comment

WELCOME TO EXAMRELIEF WAEC 2017 ANSWERS PAGE!!

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2017 WEAC (PHYSICS) 100% VERIFIED QUESTIONS

NOTE:
Tita means θ
^ means Raise to power
Pie means π
/ (means) division or divide
2 whole no 3/4 means 2¾
* means
multiplication (×)
Sqr root means √
Proportional means ∝

11-20: BBDCBDCCCD
21-30: ABCDCCCDAC
31-40: ACCBCDAABC

1)
decrease in height (h)
increase in time (t)
this shows that distance changes with time
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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
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3)
i)Brownian motion
ii)Atomic size
iii)Expansion
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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
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5a)
i)force
ii)length
5b)
by increasing the density mosquitoes lavrva than the density of water
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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
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7)
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
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8
b) 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.
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10a)
A wave front is an imaginary surface passing through the points of a medium oscillatory in phase
10bi.
i)Prismatic binoculars is used to see round corners
ii) Prism Periscope is used to bend and reflect light
10bii)
i) Refractive index of the glass prism
ii) The angle of the incident of ray
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11
a) A dielectric is an electrical insulator that can be polorised by an applied electric field.
aii) GIVEN: A = 9.6 * 10^-3 M^2
d = 2.25 * 10^4
Eo = 8.85 * 10^-12 F/m
Er = 900
C = /
using; C = EoErA/d
capacity, C = 8.85*10^-12 * 900 * 9.6*10^-3/2.25 * 106-4
C = 33984 * 10^-11
C = 3.3984 8 10^7 F
C =0.344F
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12
ai)
Nuclear fission is a nuclear reaction in which a heavy nucleus splits spontaneously or on impact with another particle, with the release of energy.
12
aii) A graphite reactor is a nuclear reactor that uses carbon as a neutron moderator, which allows unenriched 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.
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