2016/2017 WAEC GCE EXPO:PHYSICS OBJ AND THEORY QUESTIONS AND ANSWERS NOW AVAILABLE.HERE

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2016 WAEC GCE PHYSICS



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PHYSICS OBJ:
1-10: ADDCCCDBCA
11-20: DDCADBBCAB
21-30: BBDCDBABDC
31-40: ABABDDDDBD
41-50: AACDABDACD
=====================


SECTION A

(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

==========================
(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
====================================

(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
=====================

(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 satelites.
=====================================
(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
=====================================
(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.
=====================

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

10 a)
Sound Waves
1. Require a medium.
2. Travel with a speed of 332 m/s at 0 C.
3. Are longitudinal waves consisting of
compressions and rarefactions.


Light Waves
1. Do not require a medium
2. Travel with a speed of 3 *10 8 m/s.
3. Are electromagnetic waves consisting of
varying electric and magnetic fields.


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SECTION B:
(Answer three)




(10a)
-Sound wave is mechanical wave while light wave is electromagnetic
-Sound wave is longitudinal wave while light wave is transverse wave
-Sound wave cannot be plane polarized while light wave can be plane polarized

(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
=====================



(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 flow through 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



(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) 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) 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


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