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## Neco 2019 Physics Theory and Objective Answers

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Neco 2019 Physics Theory and Objective Answers by : 1:00 am On June 19, 2019

Neco 2019 Physics Theory and Obj Answers

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Physics obj
1-10 CEABCBAABB
11-20 DCCBCBCCAE
21-30 BECDDBEDDE
41-50 CBDCBBBDCB
51-60 CEDDCBAEAA

1ai)
– The body tube
– The launch lug
1aii)
– Internet and multimedia: This involves communication and exchange of information through the internet
1b)
Given:
object distance for eyepiece, u=3.0cm
Final image distance v=?
Focal length of eyepiece f=5cm
Using mirror/lens formular
1/f=1/u+12/v
1/5=1/3+1/v
Multiply through by 15v
3v=5v+15
3v-5v=15
-2v=15
v=15/-2
v=-7.5cm
The image is virtual and 7.5cm from the eyepiece on the same side of the eyepiece as the object

3a)
-Book lying on table
-A car engine that keeps running for a constant for a considerable length of time
3aii)
-Rolling ball
-Pendulum ball
3b)
Ship floats in water,although they are made of steel and iron which are materials denser than water. This Is because the ship is hollow I.e an open object

4a)
Specific latent heat of vaporization ( L ) of a substance is the quantity of heat required to change unit mass of the substance from it’s liquid at boiling point to vapor without a change in temperature
4b)
– Kinetic energy is the energy due to motion while potential energy is the energy at rest due to it’s level or position
– kinetic energy is an horizontal energy while potential energy is a vertical energy
– Kinetic energy is denoted by k.E while potential energy is denoted by P.E
– Kinetic energy does not act against gravity while potential energy acts against gravity

6a)
Wave front is a line or surface in the path of advancing wave on which all d particles are in the same phase or state of disturbance
6b)
-Plane wave front
– Spherical or circular wave front

7)
– Pupil:The pupil serves as the passage for light into the eye
– Shutter:The Shutter works on the s*********n of light before photograph can be taken
-Screen of pinhole camera: It helps to form images which are inverted

PART II
12ai) Newton’s second law of motion states that the rate of change of momentum is proportional to the impressed fotvr and takes place in the direction of the force
12aii)
– The motion of the strings in a musical instrument eg. Guitar
– The motion of the balance wheel of a watch
12bi)
Resultant force is that single force which acting alone will have the same effect in magnitude and direction as two or more forces acting together
12bii)
Equilbrum force is that single force which will balance all the other forces taken together. It is equal in magnitude buy opposite in direction to the resultant force
12ci)
Resultant force F =root4^2 + 3^2
F =root16 + 9
F =root25
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=0.24200(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(1000piet/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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