2015 WAEC GCE PHYSICS OBJ AND THEORY NOW AVAILABLE

The 100% Correct 2015 Waec Gce PHYSICS Answers



Physics OBJ
1BCBDBCCCCA
11DBBCCCACBD
21CBCDCDADDA
31BACDDBCCDC
41CADCADDBAC
(9a)
-electrical energy to mechanical energy and then heat energy
-wind energy to electrical energy
(9b)
-a narror stem
-a uniform bore
-a liquid of high thermal expansivity
(9c)
this is because heat gained by water in the pot is not lost to the sorounding and the clay pot is poor conductor of electricity
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(6)
Charge(q)=1.6*10^-19C
Potential difference(v)=1.0*10^5V
Energy(E)=1/2qV
E=1/2*1.6*10^-19*1.0*10^5
E=0.8*10^-14 E=8*10^-15J
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(7)
-Electron diffraction
-Compton effect
-Optical spectra
(8a)
i)Relative motion is the motion of a body say A in reference to another body say B
ii)Velocity of the car
=80km/hr-60km/hr
=20km/hr
(8b)
i)force is the push or pull on a body and anything that makes a body to move
ii)Contact force;push,tension,reaction
Field forces;gravitational force,electrostatic force,magnetic force
8c)
DRAW THE DUISTANCE TIME GRAPH
(8)
CLICK HERE to View No.8 Diagram
total distance travelled(s)=15m
a)
a=change in v/change in t
=v1-v0/t1-t0
1=v1-0/2-0 1=v/2
v=2m/s
b)
15=(1/2*2*2)+(2*(x1-2)+(1/2*(x2-x1)*2)
15=2+2x1-4+x2-x1
15=x1+x2-2 x1+x2=17(eq1)
a=(0-2)/(x2-x1)
2=-2/(x2-x1)
2x2-2x1=-2
x2-x1=-1(eq2)
x2+x1=17(eq1) 2x2=16,x2=8s
x1+x2=17
x1+8=17
x1=9s
Total time =2+9+8=19s
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(10a)
-Soundwave is longitudinal while radio wave is transverse
-Soundwave is mechanical while radio wave is elecromagnetic
10b)
It is louder because the tension imposed on its stem
10c)
i)-The two waves must have the same amplitude
-The two waves must have the same frequency
ii)-They must emanate from different sources
-The must super-imposed
iii)-Light must travel from optically densed medium to less dense medium
-The incidence angle must exceed the critical angle
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1a)
Acceleration(a)=change in velocity/time
Velocity=displacement/time
V=L/T
V=LT^-1
a=LT^-2 1b)
Presssure=force/Area
P=F/A
F=ma=MLT^-2
P=MLT^-2/L^2
=ML*L^-2T^-2 P=ML^-1T^-2
1c)
Density=M/L^3
=ML^-3
2)
Initial velocity(u)=42ms^-1 Angle(tita)=30degrees
H=u^2sin^2(tita)/2g
H=42^2*sin^2(30degrees)/2*10
H=42*42*(0.5)^2/20
H=22.05m
3) Mercury does not wet glass because the
cohesion of mercury to glass is greater than
adhesion of water to glass
4)
Gradient=(30-12)/(F-10)
=(12-8)/(10-5) 18/(F-10)=4/5
4F-40=90
4F=130
F=130/4
=32.5N
(5a) Tensile stress is the ratio of load or force(F) to its cross-sectional area(A). It is measured in Nm^-2 or N/m^2.
(5b) Young modulus is the ratio of tensile or compressive stress to compressive strain. It is demoted by E and measured in N/m^2
or Nm^-2(S.I unit)


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