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Author Topic: 2013/2014 NECO Physics OBJ/Objective & Essay/Theory, Real Questions And Answers  (Read 10594 times)

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Offline MEGAX

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2013/2014 NECO Physics OBJ/Objective & Essay/Theory, Real Questions And Answers
« on: June 24, 2013, 07:02:29 am »
2013/2014 NECO Physics OBJ/Objective & Essay/Theory, Real Questions And Answers

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Verified PHYSICS OBJ:
1-10: DAEDEBACCE
11-20: EADDEADCCB
21-30: DADEBBEAEC
31-40: DBBBBCBBDC
41-50: EBECDBCADD
51-60: BABCBDAADC

THEORY;
(1a) Force, unit is Newton(N) 
(1b) Acceleration, Unit is m/s^2 
(1c) Velocity, Unit is m/s

(2a)
It means that the substance contains 10 units of elementary particles and matter
(2b)
weight of objects varies because of
- The spring used in spring balance
-The acceleration due to gravity

(3a)
- Kinetic enegy, A moving car is an example
- Potential energy, bird at the top of a tree is an example
(3b)
Kinetic energy is the energy due to motion while potential energy is the energy by virtue of object

(4)
MsCs(tita1 - tita3)= MwCw(tita1 - tita3)
320.8*Cs*(100-45)= 200*4.2*(45-35.5)
17600Cs=840* 9.5
Cs= 840*9.5/17600
=7980/17600
Cs= 0.45Jg^-1K^-1

(6)
Given
t1=6s, t2=4s ,
V=2d1/t1, 330= 2*d1/6
d1= 1980/2=990m
V=2d2/t2, 330=2*d2/4
d2= 1320/2= 660m
Distance between the differences
= d1- d2
= 990-660=330m

(7a) Electrophorns
(7b)
It consist of a metal sphere and plates through which any charge objects brought closer to it releases the charge which is stored in the metal sphere


(8a)
Transformer is called slep-up when the number of turns in secondary is greater than the number of turns in primary (Ns > Np)

(8b)
Given
Ep=2200v, Ip= 40A
Ns/Np= 1/12, Es=?
Es/Ep=Ns/Np=Ip/Is
1/12=Es/2200
Es=2200/12
Es=183.3V
Secondary voltage=183.3V

(9a)
- Electromagnetic spectrum
- x-ray oscilloscope
(b)
- they are used in radiological laboratories to study defects in bones
- they are used in solar system

(10a)
- No= initial number of atoms
- alpha= decay constant= per time(per second/day)
(10b)
Given t1/2=20hrs, t=80hrs
Using,
N/No= (1/2 )^T/t1/2
N/N0=(1/2)^80/20
N/No=(1/2)^4
N/No=1/16

SECTION B
(11b)
Weighing balance
(11ci)
Static friction is the friction which occurs between two surfaces in contact when there is no relative motion between them.
Dynamic friction is the friction which occurs between two surfaces in constant when there is a relative motion between them
(11cii)
- strealining of body shape
- use of lubricants like grease

(11ciii)
W=mg
Fr=NN, Fr=Nmg
N=5.4*10=$5N
Recall, u=0,v=4m/s, S=3.6m
V^2=u^2+2as
4^2=0^2+2*3.6*s
16= 7.2a
a=16/7.2
accelration(a)= 2.22m/s
F= ma= 5.4* 2.22
F= 11.988N= 12N
from Fr = NN
12=N*54
N=12/54=0.22

(12ai)
-Radiation
- Convection
(12aii)
When a metal is heated, the temperature is raised. this increase in temperature of the molecules of the metal causes the metal to vibrate. the Vibratory motion of the molecules causes the election in the metal to move about , there by conducting electricity

(12c)
Given m=90kg
(i)when the elevator starts to ascend,
T= m(g+a)
T=90(10+4)
T=90 * 14
T= 1260N
(12cii)
When it moves with a uniform speed of 15ms^-1, reading on spring balance(T) is
T= 0N

(12ciii)
When the elevator decends rates at the rate of 3ms^-2
T=m(g-a)
T= 90(10-3)
T= 90 * 7
T= 630N

(13ai)
The laws of refraction states that
- The incident ray, the normal and the refracted ray all lie in the same plane
-The ratio of the sine angle of incidence to the sine of angle of refraction is a constant for a guven pair of media

(13b)
Given Near point(V)= 35.0cm
Least distance of distinct
vision(D)=25cm
Using
1/u+1/v=1/f
1/25+1/35=1/fs

(15ai)
radioisotopes are elements with atomic number of 82 and greater and undergoes radiativitiy by emisssion of certain radiation
(15aii)
-treatment of cancer
-sterilization of medical equipments
(15bi)
the energy conversionsthat take place in the x-ray tube is fro0m radiant energy to kinetic energy of the moving elections.
(15bii)
-by increasing the intensity of light
-by exposuren to higher frequency
(15biii)
two similarities:
-xrays and gamma rays are electromagnetic radiation in nature
-x-rays and gamma rays have high penerating power
two differences:
-xrays are faster in speed than gamma-rays
xrays are more energetic than gamma-rays
(15c)
E2=-2.42+10^-19J
E0=-21.8*10^-19J
E=E2-E0
E=-2.42*10^-19-(-21.8^10^-19)
E=(-2.42+21.8)*10^-19
E=19.38*10^-19
E=1.938*10^-18j
(15Ci)
E=HF
1.98*10^-19=6.6*10^-34*F
FREQUENCY(F)= 19.38*10^-19
F=2.94*10^15
(15CII)
C=F*LAMDA
3*10^8=2.94*10^15*lamda
wavelenght=3*10^8/(2.94*10^5)
=1.02*10^-7
lamda=1.02*10^-7m

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    Re: Free Post utme stuff
    « Reply #1 on: June 24, 2013, 08:12:47 am »
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    Re: 2013/2014 NECO Physics OBJ/Objective & Essay/Theory, Real Questions And Answers
    « Reply #2 on: June 24, 2013, 08:30:40 am »
    Good morning sir, pls are need phy/government answer
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    peterson292

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    Re: 2013/2014 NECO Physics OBJ/Objective & Essay/Theory, Real Questions And Answers
    « Reply #3 on: June 24, 2013, 08:45:47 am »
    note that ^ means raise to power. * means multiply
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    Re: 2013/2014 NECO Physics OBJ/Objective & Essay/Theory, Real Questions And Answers
    « Reply #4 on: June 24, 2013, 09:36:09 am »
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    Re: 2013/2014 NECO Physics OBJ/Objective & Essay/Theory, Real Questions And Answers
    « Reply #5 on: June 24, 2013, 09:47:55 am »
    I need physics both obj/theory......
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    Re: 2013/2014 NECO Physics OBJ/Objective & Essay/Theory, Real Questions And Answers
    « Reply #6 on: June 24, 2013, 11:17:46 am »
    Pls i need physic obj and essay
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    Re: 2013/2014 NECO Physics OBJ/Objective & Essay/Theory, Real Questions And Answers
    « Reply #7 on: June 24, 2013, 11:58:10 am »
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    Re: 2013/2014 NECO Physics OBJ/Objective & Essay/Theory, Real Questions And Answers
    « Reply #8 on: June 24, 2013, 01:29:51 pm »
    Na so nah
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    Re: 2013/2014 NECO Physics OBJ/Objective & Essay/Theory, Real Questions And Answers
    « Reply #9 on: June 24, 2013, 02:47:06 pm »
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    Re: 2013/2014 NECO Physics OBJ/Objective & Essay/Theory, Real Questions And Answ
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