Neco Gce 2016 Physics Obj And Theory Answers – Nov/Dec Expo
Neco Gce 2016 Physics Obj And Theory Answers – Nov/Dec Expo
NOTE: ANSWERS WILL BE ARRANGED ACCORDING TO NUMBERING..
PHYSICS OBJ
1bcbbedbecd
11eebacdcbed
21bacbbdbede
31aeacddbacc
41adebdebcec
51cbcabdbbde
============
1bcbbedbecd
11eebacdcbed
21bacbbdbede
31aeacddbacc
41adebdebcec
51cbcabdbbde
============
PHYSICS THEORY
UPDATED NUMBERS:
SECTION A(ANSWERS 6 QUESTIONS): 1, 2, 3, 4, 5, 7
SECTION B(ANSWERS 4 QUESTIONS): 11, 12, 13, 14
BONUS ANSWER: 16
COMPLETED
============
SECTION A(ANSWERS 6 QUESTIONS): 1, 2, 3, 4, 5, 7
SECTION B(ANSWERS 4 QUESTIONS): 11, 12, 13, 14
BONUS ANSWER: 16
COMPLETED
============
(1a)
Step up transformer has higher number of cents in the secondary
While the step down transformer has lower numbers of cents in secondary
Step up transformer has higher number of cents in the secondary
While the step down transformer has lower numbers of cents in secondary
(1b)
M=zi t
P=Mass/volume
Volume =400*0.08
32cm^3
Mass – 8.9*32
=284.85
m=zi t
t=m/ZI=284.8/3.3*10^-4*3
t=28.77*10^4 secs
t=2.877*10^5secs
==============
M=zi t
P=Mass/volume
Volume =400*0.08
32cm^3
Mass – 8.9*32
=284.85
m=zi t
t=m/ZI=284.8/3.3*10^-4*3
t=28.77*10^4 secs
t=2.877*10^5secs
==============
2a)
WEIGHT
i)Weight is a force with which gravity pulls on it
ii)The weight is a force a body exerts when it is in gravitational
WEIGHT
i)Weight is a force with which gravity pulls on it
ii)The weight is a force a body exerts when it is in gravitational
MASS
i) mass is the actual amount of material contain in the body
ii)Mass of the body is the constant quantity and does not change with the change of position or location
i) mass is the actual amount of material contain in the body
ii)Mass of the body is the constant quantity and does not change with the change of position or location
(2b) formula
Weight
F=G*m1*m2/d^2
Mass
F/
a=m
============
Weight
F=G*m1*m2/d^2
Mass
F/
a=m
============
3a)
Amplitude can be defined as the maximum extent of a vibration or oscillation,measured from the position of equilibrium
Amplitude can be defined as the maximum extent of a vibration or oscillation,measured from the position of equilibrium
3b)
Period is a length or a portion of Time
Period is a length or a portion of Time
3c)
Frequency can be defined as the rate of which something occurs over a particular time
============
Frequency can be defined as the rate of which something occurs over a particular time
============
4a)newtons third law of motion states
that action and reaction are equal and
opposite in direction
that action and reaction are equal and
opposite in direction
4b
m1u1+m2u2=V(m1+m2)
m1u1+m2u2=V(m1+m2)
15×50+(-45xm2)=15(15+m2)
750-45m2=225+15m2
750-225=15m2+45m2
525=60m2
m2=525/60
m2=8.75kg
750-225=15m2+45m2
525=60m2
m2=525/60
m2=8.75kg
Therefore the mass of the second body is 8.75kg
============
============
5a)
boiling point of a liquid is d point at which d saturated vapour pressure is equal to atmospheric pressure.
boiling point of a liquid is d point at which d saturated vapour pressure is equal to atmospheric pressure.
5b)
quantity of heat 1^2 RT
given that
1=3A
R=12n
T=25*60=1500s
quantity of heat= 3^2*12*1500
=9*12*1500
=162000
============
quantity of heat 1^2 RT
given that
1=3A
R=12n
T=25*60=1500s
quantity of heat= 3^2*12*1500
=9*12*1500
=162000
============
7)
F=r/2,F=6/2=3.0cm
1/f=1/u+1/r
1/3=1/4+1/r
1/r=1/3-1/4
1/r=4-3/12=1/12
r=12cm
but, m=v/u=12/4=3.0
=============
F=r/2,F=6/2=3.0cm
1/f=1/u+1/r
1/3=1/4+1/r
1/r=1/3-1/4
1/r=4-3/12=1/12
r=12cm
but, m=v/u=12/4=3.0
=============
11a)
-automatic doors
-burglar alarm
-airport security light
-automatic doors
-burglar alarm
-airport security light
11b)
The statement means that the minimum frequency needed to eject electrons from the metal surface is 6.0×10^-34 HZ
=============
The statement means that the minimum frequency needed to eject electrons from the metal surface is 6.0×10^-34 HZ
=============
12a)
Fundamental quantities are the basic quantities that provide the standard units of mesurenment example is length while derived quantities are quantities obtained from the fundamental quantites in form of combination example is force
Fundamental quantities are the basic quantities that provide the standard units of mesurenment example is length while derived quantities are quantities obtained from the fundamental quantites in form of combination example is force
12b)
i)it opposes motion
ii)the liniting frictional force is independent of the surface area in contact
i)it opposes motion
ii)the liniting frictional force is independent of the surface area in contact
12c)
the centre of gravity of a body is defined as the part in which the resultant weight of a body appears to act
the centre of gravity of a body is defined as the part in which the resultant weight of a body appears to act
12d)
f=60Hz, amplitude=6cm, d=4cm
i)velocity V=wr where r=d=4cm
=2^fr
=2*3.142*60*4/100
=15.08m/s
ii)acceleration,a =w^2r
=Vw
=2*3.1423*60*15.08
=5686.37m/s^2
============
f=60Hz, amplitude=6cm, d=4cm
i)velocity V=wr where r=d=4cm
=2^fr
=2*3.142*60*4/100
=15.08m/s
ii)acceleration,a =w^2r
=Vw
=2*3.1423*60*15.08
=5686.37m/s^2
============
13ai)
wheel-barrow is termed second class lever because its load is between the fulerum and the effort
wheel-barrow is termed second class lever because its load is between the fulerum and the effort
13aii)
TABULATE
FIXED PULLY
i)it consist of a wheel and a shaft and is used in conjuction with a belt to transfer energy to another fixed pully
ii)the input force and output force are equal
TABULATE
FIXED PULLY
i)it consist of a wheel and a shaft and is used in conjuction with a belt to transfer energy to another fixed pully
ii)the input force and output force are equal
MOVABLE PULLY
i)it consist of a shell,a movable wheel and a rope
ii)the input and output put forces are not equal
i)it consist of a shell,a movable wheel and a rope
ii)the input and output put forces are not equal
13bi)
-fahrenheit scale
-kelvin scale
-fahrenheit scale
-kelvin scale
13bii)
-fahrenheit scale -32degre^f-212degree^f
-kelvin scale -273k-373k
-fahrenheit scale -32degre^f-212degree^f
-kelvin scale -273k-373k
13c)
given that mass of copper ball=30g=0.03kg
temperature of copper ball=180degree census
mass of caloritueter=80g=0.08kg
Mass of water=40g=0.04kg
temperature of water=20degree census
specifie heat capacity of water=4.2*10^3kg^-^1k^-1
specifie heat capacity of copper4.0*10^2jkg^-^1k^-1
heat gain=heat loss
mc-cos=mc-cos
let the final temperature be x
0.04*4.2*10^3*(x-20)=0.3*4.0*10^2*(180-x)0.168*10^3*(x-20)=1.2*10^2*(180-x)
168(x-20)=120(180-x)
168x-3360=21600-120x
168x+120x=21600+3360
288x/288=24960/288
x=86.87degree census
============
given that mass of copper ball=30g=0.03kg
temperature of copper ball=180degree census
mass of caloritueter=80g=0.08kg
Mass of water=40g=0.04kg
temperature of water=20degree census
specifie heat capacity of water=4.2*10^3kg^-^1k^-1
specifie heat capacity of copper4.0*10^2jkg^-^1k^-1
heat gain=heat loss
mc-cos=mc-cos
let the final temperature be x
0.04*4.2*10^3*(x-20)=0.3*4.0*10^2*(180-x)0.168*10^3*(x-20)=1.2*10^2*(180-x)
168(x-20)=120(180-x)
168x-3360=21600-120x
168x+120x=21600+3360
288x/288=24960/288
x=86.87degree census
============
14ai) snell’s law of refraction states that the ratio of sine of angle of incidence to the sine of angle of refraction is constant for a given pair of media
14bi)
i-to measure the velocity of sound in air
ii-it is used for oil exploration
iii-it is used to determine the depth of the sea
i-to measure the velocity of sound in air
ii-it is used for oil exploration
iii-it is used to determine the depth of the sea
14bii
Music
Music
-Uniform vibration
-Constant frequency of vibration
-Music is good for hearing
-Constant frequency of vibration
-Music is good for hearing
Noise
-irregular vibratiom
-no fixed frequencies of vibration
-noise is bad for hearing
-irregular vibratiom
-no fixed frequencies of vibration
-noise is bad for hearing
14c)
L = 3π/4
0.7 = 3π/4
0.7×4/3 = π
π= 0.93
V= Fπ
L = 3π/4
0.7 = 3π/4
0.7×4/3 = π
π= 0.93
V= Fπ
340=f x 0.93
F = 340/0.93 = 365.59
F= 365.6HZ
============
F = 340/0.93 = 365.59
F= 365.6HZ
============
16a)
radioactive element are used in agriculture as radioactive tracers and to induce mutations in plants and animals to obtain new and improved varieties.
radioactive element are used in agriculture as radioactive tracers and to induce mutations in plants and animals to obtain new and improved varieties.
16aii)
radioactive elements are used in industry to study the defects in metals and welded joints,and to check metal fatigue, as radioisotopes,they are used to trace underground pipe lekages
radioactive elements are used in industry to study the defects in metals and welded joints,and to check metal fatigue, as radioisotopes,they are used to trace underground pipe lekages
16b)
radiological laboratory workers are protected from raidation by putting on lead overall
radiological laboratory workers are protected from raidation by putting on lead overall
16ci)
Crystal is a piece of solid matter in which the ions,molecules or atoms,are arranged in a highly regular repeating pattern or lattice
Crystal is a piece of solid matter in which the ions,molecules or atoms,are arranged in a highly regular repeating pattern or lattice
16cii)
tabulate
FACE CUBIC
-the unit cell has identical particles at each of the coners plus another in the centre
example is ZnS zinc sulphate
E=HF
tabulate
FACE CUBIC
-the unit cell has identical particles at each of the coners plus another in the centre
example is ZnS zinc sulphate
E=HF
BODY CENTRED
the unit cell hass identical particles each coner plus on the centre example are decreasing iron and platinum salts
the unit cell hass identical particles each coner plus on the centre example are decreasing iron and platinum salts
16d)
4.6*10^-19=6.6*10^-f F
F=4.5*10^-19/6.6*10^-14
F=0.68*10^15
F=6.8*10^14H2
===========
GOODLUCK
============
4.6*10^-19=6.6*10^-f F
F=4.5*10^-19/6.6*10^-14
F=0.68*10^15
F=6.8*10^14H2
===========
GOODLUCK
============
Post a Comment