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Author Topic: NECO 2022 PHYSICS ANSWERS (ESSAY & OBJ)  (Read 346 times)

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Offline MANDINHO

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NECO 2022 PHYSICS ANSWERS (ESSAY & OBJ)
« on: July 27, 2022, 06:58:49 pm »
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Offline MANDINHO

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Re: NECO 2022 PHYSICS ANSWERS (ESSAY & OBJ)
« Reply #1 on: July 28, 2022, 04:04:32 pm »
PHYSICS ANSWERS



PHYSICS OBJ
1-10: BACDAEDBEA
11-20: CBAEAEDDED
21-30: BCDCEECBCD
31-40: DCCCEBEACD
41-50: DEDDDAADED
51-60: AADCEBADAC

COMPLETED

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

PART I; ANSWER SIX(6) QUESTION FROM THIS PART

(1a)
(i) Tubes, fins or passages for conducting or directing the heat transfer fluid from the inlet to the outlet.
(ii) Abserver plate which may be flat, corrugated or grooved with tubes, fins or passages attached to it.

(1b)
NigeriaSat-1 is a micro satellite used in monitoring disasters managements and various mapping campaign WHILE NigercomSat-1 is a mega satellite responsible for creating an enabling environment for competition among operators in the industry as well as ensuring the provision of qualitative and efficient telecommunications services

(1c)
V = image
U = Object
V = 2u
1/f₀ = (1/V) + (1/u)
1/f₀ = (1/2u) + (1/u)
1/f₀ = (1+2)/2u
1/f₀ = 3/2u
f₀ = 2u/3
Magnification = (V/f₀ + 1)
M = [2u/(2u/3)] + 1
M = [(2u/1) x (3/2u)] + 1
M = 3 + 1
M = 4

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

(2a)
scalar quantities;they have magnitude but no direction and they are added by ordinary algebraic methods. WHILE vector quantities; they have both magnitude and direction and they are added by geometrical methods.

(2b)
r=3+4
=9+16
=25

r=√25
r=5n

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

(3i)
The principle of floatation states that when an object floats in a liquid the buoyant force/upthrust that acts on the object is equal to the weight of the object.
Weight of the object (W) = upthrust (F)

(3ii)
(i) Volume of the object
(ii) Density of the liquid
================================

(4i)
E= mgh = 40 X 10 X 0.3 X 6= 720J

(4ii)
P= mgh/t
m= PT/GH= 60 X 12 / 10 X 0.3 X 6 = 40g
================================

(5a).
Positive charge: This type of charge can be produced by rubbing a glass rod with silk.

(5b)
P₁ = 600mmHg
V₁ = 500cm
T₁ = 23C + 273.15 = 296.15K
T₂ = 37C + 273.15 = 310.15K
P₂ = 720mmHg
V₂ =?
P₁V₁/T₁ = P₂V₂/T₂
V₂ = (P₁V₁T₂)/T₁P₂
V₂ = (600 x 500 x 310.15)/(296.15 x 720)
V₂ = (93045000)/213228
V₂ = 436.36cm
================================

(6a)
In longitudinal waves, the particles transfer energy from one point to another by vibrating in the line of direction of propagation of the wave. The movement of particles is usually parallel to the movement of energy WHILE In transverse waves, the particles transfer energy from one point to another point by vibrating perpendicularly in the direction of the propagation of the wave. The particles are displaced perpendicular to the direction that the wave travels.

(6b)
(i) sound waves
(ii) seismic waves.
================================

(7i)
The second law of reflection states that the angle of reflection is equal to the angle of incidence. Both angles are measured with respect to the normal to the mirror.

(7ii)
(i) Colorimeter
(ii) spectrophotometer
================================

(8a)
Resistivity of the material is defined as the resistance offered to current flow by a conductor of unit length having unit area of cross-section.

(8b)
R = 0.5Ω
L = 4m
ρ = 3.0x10-⁶Ωm
ρ = RA/L
A = ρL/R
A = (3.0x10-⁶x4)/0.5
A = (1.2x10-⁵)/0.5
A = 2.4x10⁻⁵m

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

(9a)
Dielectric substances are the substances which gets polarised under the influence of external electric field. The dielectric substance generates an induced electric field (due to polarisation) in the opposite direction to the external field and so net electric field inside the dielectric material gets reduced.

(9b)
C = 3F
q = 6x10-⁴C
V = ?
C = qV
V = C/q
V = (3x10-⁶)/(6x10-⁴)
V = 5x10-V

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

PART II; ANSWER FOUR(4) QUESTION FROM THIS PART

(12ai)
=ADVANTAGES=
- Friction helps us to walk on the ground
- Friction helps in stopping a vehicle on applying the brakes.

(12aii)
=DISADVANTAGES=
- It always resists the motion, so extra energy is required to overcome it.
- It causes wear and tear of machines.

(12b)



(12c)


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

(13a)
(i) Wind energy: Produced on a large scale that could be tied to the national grid
(ii) Water energy: Kainji dam to produce electrical energy for the national grid

(13b)
(i) If two or more bodies collide in a closed system, the total momentum after the collision is equal to the total momentum before the collision.

(ii) Before the gun is fired, the initial momentum of the gun-bullet system is zero. When it is fired, final velocities are VG and VB.
That is; 0 =MGVG + MBVB
Hence, MGVG = -MBVB
The negative sign shows that the momentum of the gun is directly opposite to that of the bullet. Therefore, the gun jerks backwards or recoils.

(13c)
Heat supplied by hot water= Heat generated by cold water
MhCwΔθh = McCwΔθc
(100x3) x(θh - 30) = (200x30) x (30-20)
300(θh - 30) = 600(10)
θh - 30 = (600x10)/300
θh - 30 = 20
θh = 30 + 20
θh = 50C
Temperature of hot water = 50C

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

(14)





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

(15ai)
(i) Generator
(ii) Transformer

(15aii)
Faraday's law of electromagnetic induction states that whenever there is a change in the magnitude lines of force, e.m.f is induced, the strength of which is proportional to the rate of change of the flux linked with the circuit.

(15b)
(i) Polarization:
Polarozation is prevented by using a depolarizer such as Manganese dioxide.
(ii) Local action:
Local action can be prevented by amalgamation. That is, cleaning with H₂SO₄ and rubbing with Mercury which covers up the impurities in the Zinc plate.

(15ci)
A capacitor stores electrical charge in its electric field, WHILE an inductor stores cgargr in its magnetic field.

(15cii)


Ratio of charge in A to B
= [(1/2)CAV]/[(1/2)CBV]
= CA/CB (same voltage across)
= 3/9
= 1:3


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





Completed.


 

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