WAEC GCE Physics 2017 OBJ and Theory Answers/Questions Expo Site Runz
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In the first place WAEC (West African Examinations Council) is an examination board that conducts the West African Senior School Certificate Examination, for University and Jamb entry examination in West Africa countries. … In a year, over three million candidates registered for the exams coordinated by WAEC.
WAEC GCE Physics Questions 2017
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PHYSICS OBJECTIVES ANSWER:
1-10: CDDAECCDBCA
11-20: CCCAABBCAB
21-30: AABDDEABDC
31-40: CACADCCDBD
41-50: BBCAACDABD
PHYSICS THEORY/ESSAY ANSWER:
PHYSICS ANSWER 1)
Velocity of projection U_p =10m/s
T= sqr root 2h/g Where H=1
G=10
T=sqr root 2*1/10
=sqr root 0.2
=0.447s
V=UsinTita + gt V=10sin90 + 10*0.447
V=10 +4.45
V=14.5m/s
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PHYSICS ANSWER 2)
(i) The position of the ion of the atm of the element in the
electrochemical(activity)series.
(ii) the nature of the electrode.
(iii) the concentration of the electrolyte
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PHYSICS ANSWER 3)
l=6.5m
d=3.0mm=0.003m
e=0.20mm=0.0002m
F=60N
stress=F/A
A=pie*D^2/4
=3.142*0.003^2/4
=3.142*9*10^-6/4
=7.065*10^-6/4m^2
stress=60/7.065*10^-6
=8.49*N/m^2
==============
PHYSICS ANSWER 7)
Doping of semiconductor increases the number of holes and electrons in
the semiconductor,thereby making it impure whch makes it to be useful
or active.
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PLEASE USE THIS NO.11 IS MORE ACCURATE
11a)
-Number of turns in the coil
-Area of coil
11b)
Farad is a capacitor of a unit charge when a unit of voltage drop is applied
11ci)
The brightness of the bulb remains the same since the same current will flowthrough them
11cii)
a)The resistor should be connected in parallel with the galvanometer
b)VR=Vg
I*R=0.05I*Rg
IR=0.05I*100
IR=5I
R=5I/I
R=5ohm
11di)
I=40sin5w(pie)t
but I=Iosin2(pie)ft
therefore 2(pie)ft=500(pie)t
2f=500
f=500/2 f=250Hz
11dii)
Io=40amp
11diii)
Ir.m.s=Io/sqroot2
=40/sqroot2 Ir.m.s=28.3amp
=================
PHYSICS ANSWER 4a)
(i) Satelite is used in communication.
(4b)
(i) Rockets are used for research of the planetary bodies.
(ii) They are also used in making adventures. They are used in launching of satellites.
=====================================
PHYSICS ANSWER 5)
Applications of permanent magnet:
- (i) in telephone earpiece
- (ii) in electrical bell
- (iii) in generators
- (iv) in electrical motors
- (v) in induction coil systems
PHYSICS ANSWER 9)
Boyle’s law state that a law stating that the pressure of a given mass of an ideal gas is inversely proportional to its volume at a constant temperature.
9 bi) Renewable energy is energy generated from natural resources—such as sunlight, wind, rain,
tides and geothermal.They are energy sources that can be replaced as they are used.They are continually replenished
9bii) rain, wind, Sunlight, Geothermal
PHYSICS ANSWER 10a)
Sound Waves
- Require a medium.
- Travel with a speed of 332 m/s at 0 C.
- Are longitudinal waves consisting of compressions and rarefactions.
Light Waves
- Do not require a medium
- Travel with a speed of 3 *10 8 m/s.
- Are electromagnetic waves consisting of varying electric and magnetic fields.
10bi)
DRAW THE DIAGRAM
10bii)
Nature=>It is a real image and inverted
Position=>It is at 2f on the other side
Size=>It has the same size of the object
10c)
Because the light ray travel on a straight line ie rectilinear propagation of light rays
10d)
u=36m=3600cm
hi=2.5cm
v=0.30cm
i) m=v/u
m=0.3/3600
m=0.000083
ii) m=hi/ho
ho=hi/m
ho=2.5/0.000083
ho=30120cm
ho=301.2m
iii)
1/f=1/u+1/v
1/f=1/3600+1/0.3
1/f=0.00028+3.33333
1/f=3.33361
f=0.3cm
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PHYSICS ANSWER 12ai)
Decay constant is defined as the instantaneous rate of decay per unit atom of a substance.
(12aii)
Halflife ,T=0.693/decay contant. Hence, decay constant,llamda =0.693/T ; =0.693/3days; =0.182day-1 i.e per day.
(12bi) similarly the moderator of a nuclear fission reactor is made up of graphite.
Its function is that slow down the movement of a neutron,so that the chain reaction will not dry out.
12bii) furthermore the control rods is made of Boron steel.its function is to ensure movement of the floor,so that it can shut off the reactor automatically in case of electrical failure
VERIFIED WAEC GCE PHYSICS PRACTICALS 2017 EXPO
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