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100% Real Waec Gce 2015 Physics Obj And Theory Answers.





Physics OBJ:
1-10: BCBDBCCCCA
11-20: DBBCCCACBD
21-30: CBCDCDADDA
31-40: BACDDBCCDC
41-50: CADCADDBAC


(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)

(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

(10a)
-Sound wave is longitudinal while radio wave
is
transverse
-Sound wave 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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Posted By quadrihatic On 11:04 Mon, 14 Sep 2015

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