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Physics Neco 2015 Answers Available Now!!!




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Use This To Identify Your Answers For The Objectives.

1D -I and II only
2D-3.34*10^-7N
3C-4.0*10^3
4A-332ms^-1
5D-0.45m
6D-saxophone and trumpet
7B-sqrootVR^2+(Vc-VL)^2
8C-copper
9D-II and III only
10C-4.84&10^-19J
11E-3.3*10^-10Ns
12C-Focusing collector
13A-benue
14C-recieves signal
15E-transportation
16C-101K
17C-prevent electric sparks
18C-R and RM
19B-5.0s
20C-173.2J
21E-80.0%
22E-Venier calipers and spring balance
23A-centrifugal
24B-360m
25B-beyond 2f
26B-52.50cm
27E-shekere
28D-diffusion
29E-I,II and III
30E-Neutrons
31B-5ohm
32E-400.0Vm^-1
33C-I and III only
34C13.30cm
35B-Hot body and thermophile
36A-before,before
37D-26.7mm
38D-10.5
39E-80.00mmHg
40C-7.74N 41B-(x-z)/(x-y)
42D-240m
43D-interchanging the polarity of the
magnet
44B-minimize energy losses
45A-perforator
46E-15/16
47D-Y and X-Y
48E-(E2-E1)h^-1
49D-magnet is moving away from the
coil
50B-150V
51D-VL leads IL by pie/2 rad
52A-A red surface appearing black when
viewed under green light
53E-Sun and firefly
54A-2.0
55C-methane
56D-inertia
57B-Burning of firewood
58E
59D-momentum and weight
60C-w^2/2x



(1a)
-Coil
-Rotor
-Springs

(1b)
-For space exploration
-For warfare
-For scientific research

(1c)
-They are used as battery charger for boats and caravans
-They are used for powering garden equipment


(4)
Velocity ratio(V.R)=1/sintita
4=1/sintita
sintita=1/4
tita=sin^-1(0.25)


(7)
This is because the speed of sound decreases as temperature increases.On hot day the temperature in high hence the speed decreases while on cold day,the speed increases because temperature is lowered


(2)
Given; d=10units
R(6,4) and S(2,K)
d=sqroot(y2-y1)^2+(x2-x1)^2
10^2=(k-4)^2+(2-6)^2
100=k^2-8k+16+16
k^2-8k+32-100=0
k^2-8k-68=0
k=8+_sqroot(8^2-4*1*-68)/2
k=8+_sqroot(64+272)/2
k=8+_sqroot(64+272)/2
k=8+_sqroot(336)/2
k=8+_18.3/2
k=8-18.3/2 or 8+18.3/2
k=-5.15 or 13.15


(8)
Given;length(l)=2.0m
Resistance(R)=3.0ohm
Diameter(d)=0.8mm
d=0.8*10^-3m
Resistivity=?
R=el/A
A=(pie*d^2)/4
=3.142/4*(0.8*10^-3)^2
A=(3.142*0.64*10^-6)/4
A=0.50*10^-7m^2
A=5*10^-7m^2
3.0=(e*2)/(5*10^-7)
e=(15*10^-7)/2
Resistivity(e)=7.5*10^-7nm

(12a)
-Sugar tongs->third class
-Nutcracker->second class
-Bottle opener->first class

(12b)
(i)Archemedes' principle states that a body
which is wholly or partially immersed in a fluid
,experiences loss in wheight which is equals to
weight of fluid displaced
(ii)This is due to the resulting apparent weight
of the object in liquid which is less than true
weight



(12c)
Given; mass(m)=500g=0.5kg
Force constant(k)=4Nm^-1
(i)Period (T)=w=sqroot(k/m)
=sqroot(4/0.5)
w=sqroot(8)
=2.83rad/s
w=2*pie*f
w=2*pie(1/T)
2.83=(2*3.142)/T
T=(2*3.142)/2.83
=2.22s
(ii)frequencyf=1/T
f=1/2.22
=0.45Hz
(14a)
landa=wavelength
x=wave distance
v=velocity/speed
(14b)
(i)The eye is a natural optical device while
camera is artificial optical device
(ii)-Both eye and camera are used as optical
device
-Both eye and camera use lenses
(14c)
(i)Resonance is a phenomenon where by a
vibrating body sets another body vibrating
both having the same natural frequency
(ii)Length(L)=45cm=0.45m
L=landa/2
0.45=landa/2
landa=0.45*2=0.90m
v=f*landa
340=fo*0.90
fo=340//0.90
fo=377.8Hz
15a)
i)-its presence gives charge
-its presence bring spark
-its presence bring light
ii)The presence of charge is responsible
for moving charges
15b)
i)-it is used for radio turning
-it is used to reduce spark
ii)-Area of over-lap between the plates
-Dustance of seperation between the
plates
15c)
Force(Fxy)=1.13*10^11N
(Fzx)=3.60*10^11N
i)Resultant force(Fzy)=R
R=sqroot(Fxy^2+Fzx^2)
R=sqroot(1.13*10^11)^2+(3.60*10^11)^2
R=sqroot(1.28*10^22+12.96*10^22)
R=sqroot(14.24*10^22)
R=3.78*10^11N
ii)tan tita=(3.60*10^11)/(1.13*10^11)
=3.19
tita=tan^-1(3.19)=72.60 degrees



(17a)
(i)An artificial satallite is any unamed space
craft projected from earth with sufficient
speed to coast out of reach of earth's gravity
to attain escape velocity
(ii)NigComSat-1 is Nigerian communication
satellite

(17b)DRAW THE TRANSFORMER

(17c)
Image distance(v)=20cm
Magnification(m)=220/20=11
M=hI/ho
11=hI/8
hI=11*8=88cm
11=v/8
v=88cm
1/8+1/88=1/f
f=88/12
f=7.33cm

------------------COMPLETED---------------






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