Neco 2017 Physics Answers.
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Physics obj
1-10 CEABCBAABB
11-20 DCCBCBCCAE
21-30 BECDDBEDDE
31-40 DBAEADBABA
41-50 CBDCBBBDCB
51-60 CEDDCBAEAA
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NECO 2017 (PHYSICS)
(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.
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2017 NECO Physics obj & theory EXPO,CHOKES, QUESTION,ANSWERS – FOR REAL QUESTIONS AND ANSWERS
PHYSICS OBJ:
1CEABCBAABB
11DCCBCBCCAE
21BECDDBEDDE
31DBAEADBABA
41CBDCBBBDCB
51CEDDCBAEAA
PART I – ANSWER 6
1ai)
i)propellant
ii)nozzle
1aii)
i)used for communication
ii)used for access geographically dispersed terrains and uneven topography that characterise the nations landscappe
1b)
Given: Object distance for eyepiece, U=3.0cm
Final image distance, V=?
Focal length of eyepiece, F=5.0cm
using the mirror/lens formular
1/f=1/u+1/v
1/5=1/3+1/v
multiplying through with 15v(1.cm)
3v=5v+15
3v-5v=15
-2v=-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
2)
Given Radius, r=25m
linear velocity, v=20m|s
centripetal acceleration,a=?
Using:
a=V^2/r2
a=20^2/25
a=16m|s^2
6a)
A wave front is the locus of points characterized by propagation of position of the same phase: a propagation of a line in 1D, a curve in 2D or a surface for a wave in 3D. In other words a line or surface in the path of an advancing wave on which all the particles are vibrating in phase is called a wave front.
6b)
i)plane wave front
ii)spherical wave front
7)
Pupil- Regulates the amount of light entering the eye
Shutter-admits or shuts off light from the film of the camera
Screen-used to focus light from a near object in front of the pinhold camere
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 reactions 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 fussion are more cheaply and readily available
iii)fusion process produce less dangerous by product
PART II – ANSWER 4
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)
i)a swinging pendulum
ii)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=sqr4^2+3^2
F=sqr16+9
Fsqr25=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 = 274.7m|s
13ai)
i)Solar energy is for providing a cheap and clean source of hot water supply.
ii)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
13b)
The principle of conservation of linear momentum us also utilized in the propulsion of jet aircraft. Gases are burnt with
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