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100% NECO 2017 Real (Obj and Essay Physics) Answers Available Here..
Author: Mr. Dan
Posted on: 14:56:52 Sat, 08 Jul 2017


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100% NECO 2017 Real (Obj and Essay Physics) Answers Available Here..
===================
+++++++++++++++++++++
Physics OBJ:
1-10: CEABCBAABB
11-20: DCCBCBCCAE
21-30: BECDDBEDDE
31-40: DBAEADBABA
41-50: CBDCBBBDCB
51-60: CEDDCBAEAA
+++++++++++++++++++++

PART I
Answer any five questions from this section

(1a)
(i)Propellant
(ii)Nozzle

(1aii)
(i)It is used for communication
(ii)It is used to access geographical dispersed terrains and even topography that characterise the nation's landscape

(1b)
Given:
Object distance for eyepiece=3.0cm
Final image distance V =?
Focal length of eyepiece f=5.0cm
Using mirror / lens formular

1/f = 1/u + 1/v
1/5= 1/3 + 1/v
Multiplying through with 15v
3v = 5v + 15
3v - 5v = 15
-2v = 15
V = - 15/2
V= - 7.5cm

The final image is virtual and 7.5cm from the eyepiece on the same side of the eyepiece as the object

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


(4a)
The specific latent heat of vaporization of a substance is the quantity of heat required to change a unit mass of the substance from liquid to vapour without change of temperature

(4b)
Kinetic energy is that possessed by a body due to its motion. While potential energy is that possessed by a body due to its height or state

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


(5a)
(i) solar
(ii) wind

(5b)
Given:
M1=15kg, U1 =10m/s , V =?
M2 = 5kg, U2 =0 m/s

Using
M1V1 + M2V2 = V(M1 + M2)
15(10) + 5(0) V(15 + 5)
150 = 20V
==>20V = 150
V = 150 / 20
V= 7. 5m/s
Common velocity =7.5m/s

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



(9a)
(i) Over charging(for secondary cell)
(ii) self discharge (for primary cell)

(9b)
Self discharge: A primary cell lose a considerable percentage of their charge when stored at room temperature. This is due to non-current producing "side" chemical reaction that occur within the cell even when no load is applied

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



(10)
(i)Fusion is more easily achieved with lightest elements such as hydrogen
(ii) The raw materials required for fusion are more cheaply and readily available
(iii) Fusion process produce less dangerous by-products

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




PART II
Answer any four questions from this section

(12ai)
Newtons second law of motion state that the rate of change of momentum of a body is proportional to the applied force and take place in the direction of the surface

(12aii)
(i)A swinging pendulum
(ii) motion of the balance wheel of a watch

(12bi)
A resultant force is that single force which could have the same effect in magnitude and direction as the original force acting together

(12bii)
Am equilibrium force is that single force which will balance all the other forces taken together.it is equal in magnitude but opposite in direction to the resultant force

(12ci)
Resultant force F =√4^2 + 3^2
F =√16 + 9
F =√25
F=5N

(12cii)
Using F = m(v - u) / t

5= 5.5 (v - 2) / (5 × 60)
=5 × 60×5 = 5.5(V-2)
5.5(V - 2) = 1500
V - 2 = 272.7
V=272.7 + 2
V=274.7m/s

Final velocity of body is = 274.7m/s

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


(13ai)
-Solar energy is for providing a cheap and clean source of hot water supply.
-Solar energy provides electricity supply

(13aii)
-Renewable energy are those that can be replaced as they are used up. They can be continually replenished as they are exploited and utilized while Non-Renewable energy are those that cannot be replenished as they are used up
-Examples of renewable energy are Solar energy, wind energy, Biomass and Bio feuls while examples of Non renewable energy are Coal and wood, Fossil fuel, Petroleum and Natural gas, Nuclear energy

(13b)
The principle of conservation of linear momentum us also utilized in the propulsion of jet aircraft. Gases are burnt within the combustion chambers of the engine. As jets of hot gases are expelled downwards through the tail nozzle at very high speeds from the aircraft, an equal and opposite momentum is given to the rocket or aircraft which then moves forward

(13c)
Given:
mass m=0.2kg
Heat lost H=4200J
Initial temperature tita1=100C
Final temperature tita2=?
SHC of water Cw=4200j/kg/k
Using:
Heat lost=MwCw(tita1-tita2)
4200=0.2*4200*(100-tita2)
(100-tita2)=4200/(0,2*4200)
100-tita2=5
tita2=100-5
tita2=95C
Final temperature=95C

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



(14ai)
A transverse wave is one which travels perpendicularly to the direction of vibrations producing the wave

(14aii)
-Light waves do not need a material medium for its propagation but sound waves does
-Light waves cannot be plane polarized but sound waves can

(14b)
Given y=4sin(1000pie*t/landa + 0.5x)
Comparing with y=Asin(2pie ft +2pie/landax)

(i) 2pie/landa=0.5
landa=2pie/0.5
landa=2*3.142/0.5
landa=12.56cm
Hence wavelength, landa=12.56cm

(ii) Also 1000pie/2pie*landa=500/landa
=500/12.56
=39.8Hz
f=39.8Hz

(iii)Speed V=flanda
v=500/12.56 *12.56
Speed v=500cm/s
v=5m/s

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


(15a)
Coulomb's law state that magnitude of the electrostatic force of attraction between two point charges is directly proportional to the product of the magnitudes of the charges and inversely proportional to the square of the distance between them

(15bi)
Diagram

(15bii)
Let equivalent resistance be R
1/R = 1/R1 + 1/R2 + 1/R3
I/R = R2R3 + R1R3 + R1R2 / R1R2R3
R= R1R2R3 / R1R2+R2R3+R1R3

(15c)
Given: 200Ω C =4mf f=50h2 π =3.14

Impedance Z =√R^2 + (1/2Ω + c) ^2
Z =√200^2 + (1/2×3.145×50×4×10^-6)^2
Z=√200^2 + 796.178^2
Z=√40000 + 633900
Z=√673900
Z=821Ω
























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