NECO GCE physics Questions and Answers  2019 NECO GCE

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NECO GCE Nov/Dec  physics ANSWER

Physics Paper I Thursday 05/12/19 2.00p.m -3.30p.m

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*Physics OBJ*
1-10: CACABDBECA
11-20: CCDBBDEECA
21-30: ECACEDACDB
31-40: CADBBDCBBC
41-50: EBCADACDAE
51-60: CDCBCEDCCB
===================

(2a)
(i) Acceleration
(ii) Velocity

(2b)
MSR = 8.5mm
VSR = 15mm
TSR = MSR + VSR
= 8.5 + 15
= 23.5mm
================
(3i)
Draw the velocity time graph [https://i.imgur.com/pOY608T.jpg]

(3ii)
magnitude of u if the distance covered during deceleration is 75ms-¹
Area of BCD = 1/2bh
=>1/2×15/1×u/1 = 75
15u = 150
u = 150/15
u = 10ms-¹
===================

(4a)
(i) Nuclear fission
(ii) Discharge of fossil fuels such as oil, gas and coal to the atmosphere

(4b)
h = 1.6m
V = ?
g = 10m/s²
V² = u²+2gh
V² = 2×10×1.8
V² = 36m/s
V = √36
= 6m/s

======

(5)
U1 = 4m/s
U2 = 0m/s
M2 = 60g = 0.06kg
V = 2.5m/s
M = ?
M1U1 + M2U2 = (M1+M2)V
M1(4) = (M1 + 0.06)2.5
4M1 = 2.5M1 + 1.5
4M1 – 2.5M1 = 1.5
1.5M1 = 1.5
M = 1.5/1.5
=1kg
===============
(6a)
Draw the diagram [https://i.imgur.com/9qfxjGr.jpg]

(6b)
(i) It is used in torches, searchlights and headlights of vehicles to get powerful parallel beams of light.
(ii) They are used as shaving mirrors to see a larger image of the face.
===================
(10a)
Surface tension is the attractive force exerted upon the surface molecules of a liquid by the molecules beneath that tends to draw the surface molecules into the bulk of the liquid and makes the liquid assume the shape having the least surface area.

(10b)
{Pick any 2}
(i) It is in violation of the Heisenberg Uncertainty Principle. The Bohr Model considers electrons to have both a known radius and orbit, which is impossible according to Heisenberg.
(ii) The Bohr Model is very limited in terms of size. Poor spectral predictions are obtained when larger atoms are in question.
(iii) It cannot predict the relative intensities of spectral lines.
(iv) It does not explain the Zeeman Effect, when the spectral line is split into several components in the presence of a magnetic field.
(v) The Bohr Model does not account for the fact that accelerating electrons do not emit electromagnetic radiation.
====================
(11a)
(i) Negligible mass = Gamma radiation
(ii) Large Ionization Power = Alpha Particle

(11b)
λ=0.693/T½
λ=0.693/18000
λ=0.0000385 s-¹


(12ai)
The volume of a stone is measured using a measuring cylinder by firstly measuring the volume of water in cylinder (v2) , then the stone is dropped into the cylinder (v2)
Let v1 = volume of water without stone
V2 = volume of water and stone.
Therefore the volume of stone = v2 – v1

(12aii)
(i) Nature of the liquid.
(ii) Volume of the liquid.
(iii) Shape of the container of the liquid.

(12bi)
A body is said to be on dynamic equilibrium if the body is moving continually with a constant acceleration.

(12bii)
Draw the diagram [https://i.imgur.com/6KYI8Ca.jpg]

Fy = 0(at equilibrium)
Fa + Fb – W1 – W2 = 0
Fb = W1+W2-Fa ….(1)
Taking moment about point A
W1 × 0.02 + W2×0.05 – Fb×0.07 = 0
0.07Fb = 0.02W1 + 0.05W2
Fb = 2W1+5W2/7 …(2)

(12ci)
Draw the diagram [https://i.imgur.com/6KYI8Ca.jpg]
u = 7m/s
Time of flight = 10s

Time of flight (T) = 2usinΦ/g
10 = 2×70sinΦ/10
140sinΦ = 100
sinΦ = 100/140 = 0.7143
Φ = sin-¹(0.7143)
Φ = 45.58°
Φ = 46°

(12cii)
Maximum height = u²sin²Φ/g
H = 70²sin²45.58/2×10
H = 4900×0.7143²/20
H = 125m
Maximum height = 125m


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