WAEC 2020 Physics Obj And Essay Answer – Aug/Sept Expo

WAEC Physics Obj And Essay/Theory Solution Questions and Answer – Aug/Sept 2020 Expo Runz.

PHYSICS OBJ:
1-10: DCCAACDCCC
11-20: BDACABDCCB
21-30: ACBACCCBAD
31-40: BDDBAACCCA
41-50: CAAABBCBBC

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PLEASE NOTE: asteric(*) MEANS multiplication(x).
{1,2,,4,5,6,,8,9,10 12 Completed}

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SECTION B: Answer ONLY THREE Questions from this Section

(12)
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(10ai)
Critical angle is defined as the angle of incidence in the denser medium when the angle of refraction in the dense medium is 90°

(10aii)
The conditions necessary for total internal reflection to occur
1. Light must be traveling from an optically more dense to an optically less dense medium.
2. The angle of incidence in the denser medium must be greater than the critical angle.

(10aiii)
Three practical applications of total internal reflection:
[Choose three]
(i) Mirages
(ii) Field of view of a fish under water.
(iii) Refractometer.
(iv) Optical fibre.
(v) Binoculars.

(10b)
Two effects of refraction:
(i) Apparent depth of a swimming pool.
(ii) Apparent bending of a stick partly immersed in water.

(10ci)
Progressive wave is defined as a wave that transfers energy in traveling or moving away from the source of the disturbance.

(10cii)
y = 0.5sin(1000πt - 100πx)/17 = y = Asin(2πx/λ - wt)

(∝) at = 1000πt
===》 w = 1000
But w = 2πf
2πf = 1000π
f = 1000/2
f = 500Hz

(β) 2πx/λ = 100π/17 x
2/λ = 100/17
λ = 2×17/100
=0.34m

(γ) V = fλ
= 500 × 0.34
=170m/s
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(9)
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(8a)
A torque or moment of a couple is the product of one of the forces and the perpendicular distance between the lines of action of the two forces.

(8aii)
(i)The two forces must be equal
(ii)The two forces must be opposite parallel
(iii)They must be equal distance between them

(8bi)
Free fall is defined as the motion of the body where gravity is the only force acting upon it.

(8bii)
Height of tower H = 40.0m
Velocity v = 10.0m/s, time t= ? , g=10.0m/s

Using the relation
S= ut + 1/2gt^2
H= ut + 1/2gt^2
40= 10t + 1/2*10t^2
4= t + t^2/2
= t^2 + 2t - 8=0 ( solving quadratically)
= (t+4)(t-2)=0
t+4=0 or t-2=0
t= -4 or t=2

Therefore time to fall on the ground t=2s
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(8c)
Side of cube of wood = 8.0cm
2.0cm = 1/4 of the side immersed in water
R.density of water Rw = 1.00
R.density of Oil = Ro = 0.72
Volume of the wood V = L³
= 8×8×8
V = 512cm³
Volume immersed in water = 1/4×512 = 128cm³
Weight of water displaced = 128g × Rwater = 128×l
By applying the principle of flotation
Mass of wood = 128×Rw
=128 × l = 128g
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SECTION A: Answer ONLY FIVE Questions from this Section

(6)
Angle at horizontal θ = 30°
Time of light , T = 25sec
Velocity of projection u = ?
But T=2using sinθ/g
25= 2u*sin30/10
25=0.5u/5
0.5u=125
U=125/0.5
=250ms-¹
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(5)
Work done in a gravitational field = force × distance
= f × r
= GMeM/R² × R
= GMeM/R
Work done is also kinetic energy, K.E = 1/2MVe²
Equating both
GMeM/R = 1/2MVe²
Ve² = 2GMe
Ve = √2GMe/R -----(1)
Also,Force f = GMeM/R² = mg
Me = gR²/G -----(2)
Putting (2) into (1)
Ve = √2GgR²/GR = √2gR
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(4)
V∝ Tx μy
LT-∝(MLT-²)x(MLT-¹)y
LT-¹∝ m*L*T-²x x m y L-y
LT-¹∝ m(x+y)L(x-y)T-²x
Comparing
X-y=1
X+y=0
-2x=1
From equation 3
X=½
Putting x = ½ into (eq) 2
y=-½
Equation is
V∝ T½ μ-½
V∝ √T/μ
V= k√T/μ
Where k is constant
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(3a)
Plastic

(3b)
The refractive index of the core must be greater than that of the cladding.

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(2a)
Metal flat plate: It is a collector of heat that converts the radiant solar energy from the sun into heat energy by the process of greenhouse effect.

(2b)
Thermal Insulator: It prevents loss of accumulated heat in the solar collector and thereby improves its absorption efficiency.

(2c)
Tubes: They are use to capture almost all the sun's energy. It is the most effecient solar collector

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(1)
Original length Lo = 3m
Extension e = 310 = 3*3 = 9m
F×e
F = ke where k = 982.3NM-²
F = 982.3*9 = 8840.7N
The five that produce the extension F = 8.840.7N
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COMPLETED - GOODLUCK

QUESTIONS 👇
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