2015 WAEC GCE PHYSICS ANSWER IS READY.GET IT NOW

2015 WAEC GCE NOV/DEC

EXAM DAY: TUESDAY 

PAPER: PHYSICS

VERIFIED PHYSICS OBJ
1BCBDBCCCCA
11DBBCCCACBD
21CBCDCDADDA
31BACDDBCCDC
41CADCADDBAC

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

5ai)

Tensile stress: this occurs when a material is subjected to
pulling or stretching force.

5aii) Young modulus is a measure of elasticity, equal to the ratio of the
stress acting on a substance to the strain produced. Ie Y= Stress/strain

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

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
total distance travelled(s)=15m

(8cii)
Acceleration=v/t
1=v/2
V= 2m/s

(8ciii)
Total distance covered=1/2(BC+AD)*BF
But: Retardation=V/ED
2=2/ED
2ED=2, ED=2/2
ED=1sec

From the diagram BC=AD-(AF+ED)
BC=AD-(2+1)
BC=AD-3

Total distance= 1/2(AD-3+AD)*BF
15=1/2(2AD-3)*2
15=AD-3
2AD-18
AD=18/2 = 9
Therefore time taken = 9secs

OR
8cii)
a=change in v/change in t
=v1-v0/t1-t0
1=v1-0/2-0 1=v/2
v=2m/s

8ciii)
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

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