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WAEC GCE 2016: Physics Questions And Answers Now Available Here
WAEC September 15, 2016 • 4 years ago • No Comment Yet

Verified Physics obj

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100% CERTIFIED THEORY ANSWERS

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 atom 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)They are used in the fields of communications
4b)
ii)warfare
ii)in exploring space

==================

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.

9bi) Renewable energy is energy generated from natural resources—such as sunlight, wind, rain, tides and geothermal

9bii)
rain
wind
Sunlight
Geothermal

==================

10a)

Sound Waves
i)Require a medium.
ii)Travel with a speed of 332 m/s at 0 C.
iii)Are longitudinal waves consisting of compressions and rarefactions.

Light Waves
i)Do not require a medium
ii)Travel with a speed of 3 *10 8 m/s.
iii)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
==============

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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