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Neco 2017 Physics Obj And Theory Questions And Answers

 

PHYSICS

PHYSICS OBJ:
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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 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
13c)
Given: mass, m=0.2kg
heat lost,it=4200J
intial temperature cost r= 100’C
final temperature cost=?
S. It . c of water, C10=4200J/kg/k
using:
heat lost= M10, C10 (cost-tf)
400=0.2*4200*(100-costf)
=4200/0.2*4200
100-costF=5
100-5=costf
=cost=100-5
costf=95’C
final temperature=95’C
14ai)
A transverse wave is one which travels
perpendicularly to the direction of the
vibration producing the wave.
14aii)
i)Light Wave do not need a material medium
for preparation, but sound wave does
ii)Light wave cannot be plane polarised but
sound wave can
14b)
Given Y= 4sin (100×22/7xt/2 + 0.5x)
Comparing with
Y = A sin (2xPIxft + 2pi/pi x) Note : {the PI is
the 22/7}
14bi)
2 x 3.142/0.5 = 12.56cm
Hence Wave length is 12.56
14bii)
Also 1000PI/wave length = 2PI F
= 1000PI/12.56 = 500/12.56
= 39.8Hz
14biii)
Speed (v) = F x Wave length
= V = F x Wave Length
V = 500/12.56 x 12.56
= 500cm/s
Conversation to M = 500/100
= 5m/s
15a)
Coulomb’s Law state that the magnitude of
the electrostatic force 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
R1
R2
R3
I<-V
15bii)
let equivalent resistance be R
1/R=1/R1+1/R2+1/R3
1/R=R2,R3+R1,R3+R1,R2/R1,R2,R3
R=R1,R2,R3/R1,R2,+R2,R3+R1,R3
15C)
Given; R=20n,C=4HF,F=50H2,TI=3.14
z=sqr R^2+(1/2TiFc)
z=sqr200^2+(1/2*314*50*4*10^-6)
z=sqr200^2+796.178^2
z=sqr40000+633900
z=sqr673900
z=821n

(16a)
principle or Heisenberg’s indeterminacy
principle , is any of a variety of mathematical inequalities asserting a fundamental limit to the precision with which certain pairs of physical properties of a particle, known as complementary.
(16b)
(i) an elements re made up of atoms…
(ii) atoms can neither be destroy nor created during chemical reaction…
(16c)loading.
(16d) loading….
======================================
17ai)
Scientific research: rockets are used by scientists to explore d earth’s atmosphere. The rockets carry metereological equipment such as barometers,cameras,thermometers, etc up to the atmosphere and up there,they are used to measure weather conditions and make weather forecasts. These weather equipments are carried in weather satellite and transported into the atmosphere by a rocket.
17aii)
Power: electricity is needed for the instruments and to enable the spacecraft directional control. In most cases , power is provided by solar arrays. Sometimes, in cases like the recently launched ,saturn-bound satellite,called CASSINI, solar arrays do not supply enough power for planetary probes; instead,nuclear generators are used.
COMMUNICATION: the satellite with ground control so directions and commands can be sent up and down. To provide radio contract,satellites have radio antennae
17b)
It increases the life span of the machine
It reduces wear nd tear.
17c) loading…..
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Completed…


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4 comments

  1. Waec resul 2017

  2. Abdul,aziz kawu

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  4. TAIWO ADEBAYO

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