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

By 11:04 Mon, 14 Sep 2015 Comments

Physics OBJ:

1-10: BCBDBCCCCA

11-20: DBBCCCACBD

31-40: BACDDBCCDC

(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)

=(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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