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2020 NECO Physics Questions and Answers
NECO November 19, 2020 • 5 days ago • No Comment Yet

WELCOME TO EXAMRELEIF 2020 NECO ANSWERS PAGE

KEEP REFRESHING THIS PAGE UNTIL THE QUESTIONS AND ANSWERS ARE FULLY UPLOADED

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100% VERIFIED PHYSICS QUESTIONS
Page 1. CLICK HERE
Page 2. CLICK HERE
Page 3. CLICK HERE
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👑 2020 NECO VERIFIED PHYSICS ANSWERS👑

100% VERIFIED PHYSICS OBJ ANSWERS

1-10: BCBDBDCDCD
11-20: DACBEBABDE
21-30: CDDDABBBAC
31-40: CDAEBBCCDC
41-50: BEEBDBAEEC
51-60: DDCDADDEBD

100% VERIFIED PHYSICS ESSAY ANSWERS

PART I
(Answer only Six questions from this part, Question 1 and any other Five)

(1a)
(i)printing machine
(ii)sterilizer

(1b)
Diagram (step up transformer) [CLICK HERE]

(1c)
1=1.26
t=48005
m=?
z=3.3*10^-⁴g
m=3.3*10^-⁴*1.26*4500
=1.996gram
≅2gram
=======================

(2a)
A system is unstable when displaced, it experiences a net force in the same direction as the displacement from equilibrium. It tends to accelerate away from its equilibrium position if displaced even slightly while for neutral equilibrium, the system is independent of displacement from its original position

[CLICK HERE]

(2b)
(ii)Low centre of gravity
(ii)Large surface area in contact
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(3a)
Velocity is defined as the rate of change in the displacement of a body it is a vector quantity with the S.I unit of ms-¹

(3b)
DIAGRAM [CLICK HERE]
=======================

(4)
At equilibrium position Point B, the body possess maxim kinetic energy. As it moves out to end point A and C. It stops momentarily before changing its direction.

Diagram [CLICK HERE]
=====================

(5a)
They are both derived quantities

(5b)
67-0/100-0 = x-25/100-25
67/100 = x-25/75
61*3 = 4(x-25)
201 = 4x-100
4x = 201+100
4x = 301
x = 301/4 = 75.25 ohms

CLICK HERE FOR SNAPPED ANSWERS
==========================

(6a)
(i)violin
(ii)guitar

(6b)
The depth of field of a lens camera is less than that of a pinhole camera
==========================

(7a)
– An amplifier
– A speaker

(7b)
u = 16cm
m = 4=v/u
:. v =4u
v = 4×16 = 64cm
Recall, 1/f = 1/u + 1/v
1/f = 1/16 + 1/64
1/f = 4+1/64
1/f = 5/64
f = 64/5 = 12.8cm
==========================

(8a)
The zinc atoms on the surface of the anode oxidizes I;e they give up both their valence electrons to become positively

(8b)
Diagram [CLICK HERE]
===========================

(9a)
The power factor of a circuit is unity when the apparent power equals or some as the real power

(9b)
V=Vr+Vc
15=12+Vc
Vc=15-12
Vc=3v

CLICK HERE FOR SNAPPED ANSWERS
========================

(10a)
(i)Viscosity
(ii)weight
(iii)upthrust

(10bi)
(i)Viscosity; the force in between the layers of flurds this force would tend to reduce the velocity at which the stone moves down till it reach terminal velocity

(ii)weight; is the actual force acting of the stone in the liquid.

(iii)upthrust; is the upward force felt by reply objects in flurd, due to the area displace

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=====================================

(11i)
A=9 (molecular mass)
B=6 (atomic mass)
C=0

(11ii)
Z=Energy

(11iii)
Nuclear fusion

CLICK HERE FOR SNAPPED ANSWERS
=============================

PART II
(Answer any Four (4) Questions from this part)

(12ai)
(i)Push
(ii)Pull

(12aii)
– It causes the body to move
– It determines the direction of which the body moves

(12b) Parallelogram rules states that if the two sides of vectors are represented by the two opposite sides of a parallelogram the adjacent side drawn from a common point represent the resultant

(12ci)
From the principle of moment,
SAGW = SCW
36*25 = x*15
900 = 15x
x = 900/15
x = 60g

(12cii)
60x = 36(30-x)
60x = 1080 – 36x
60x + 36x = 1080
96x = 1080
x = 1080/96
x = 11.25cm

:. Distance from balance point = 25cm + 11.25cm = 36.25

(12)
Diagram [
CLICK HERE]

===================

(13ai)
(i)When the air is cooler to its dew point
(ii)When it becomes so saturated with water vapour that it cannot hold any more water

(13aii)
(pick 2)
(i)Both the processes, water vapour sis given off from the liquid
(ii)Both are dependent on the vapour pressure
(iii)At the end of both processes, they result in the change of state from liquid to vapour

(13b)
When a body is dropped from a certain height,the potential energy gradually changes into kinetic energy on reaching the ground,the whole of its potential energy gets converted into kinetic energy. But when the ball strikes the ground, the kinetic energy is converted into sunlight and heat

(13ci)
Total workdone = Workdone in raising the load + workdone against friction

7200 = (500×12) + workdone against friction
Workdone against friction = 7200-6000 = 1200J

(13cii)
Efficiency = Work output/Work input × 100%
= 500×12/7200 × 100%
= 6000/7200 × 100%
= 83.3%

>CLICK HERE FOR SNAPPED ANSWERS
========================

(14ai)
T = period
λ = wavelength
w = 2π/T

(14aii) T = 2π/w

(14aiii) T = 1/f

(14b)
Vshallow = fshallow × λshaddow
0.6 = fshallow × 0.04
fshallow = 15Hz
fshallow = fdeep
f = 15Hz

(14c)
Refractive index= Vdeep/Vshallow
= 0.8/0.6 = 1.33

CLICK HERE
===========================

(15a)
Potential difference is the measure of the Carrier of charge in a circuit it is measured in volts

(15b)
Diagram [CLICK HERE]

A varying currents of audio frequencies for in the speech coil when it is working. The force varies at the same frequency as the currents. The vibration of the diaphragm create sound waves as a result of the magnet. A soft iron piece is positively wound around an insulated wire many tones. This act as the speech coil when a varying speech current flows into the earpiece, the strength of the electromagnetic formed varies of the same frequency as the speech coil.

(15ci)
P=v²/R
1200=220²/R
1200R=220²
R=40.3Ω

(15cii)
Cost= p*t*unit cost
=1200 ÷100*5*34
=204
=========================

(16a)
Based on the structure of solids, crystalline structure are those which are arranged in a repeated pattern or lattice eg Nacl while that of Amorphous is that which the atoms of the matter is scattered and have no order of arrangements eg plastic

(16b)
(i) Solids and liquids
(ii) Since the perfume is said to be move concentrated at that point would begin to diffuse rapidly from the region of high concentration until it evenly distributed to all parts of the room

(16c)
The more the density, the greater the viscosity, cold liquid are said to be more densed than that of hotter liquids due to that they have more viscosity. A palm oil is a typical example

(16di)
T1/2 = 0.693/λ
T1/2 = 0.693/0.01155
T1/2 = 60 days

Half life = 60 days

(16dii)
dN/ft ∝ No
dN/dt = λNo
dN/dt = 0.01155 × 250
dN/dt = 250.01155

=====COMPLETED=====

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