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Neco 2016 Physics Objective and theory Answers – june/July Expo

Neco 2016 Physics Objective and theory Answers – june/July Expo

VERIFIED NECO 2016 PHYSICS QUESTIONS AND ANSWERS

Wednesday 29th June.
Paper III & II: Objective & Essay – Physics 10:00am – 1:00pm

 Verified Physics OBJ:

1-10 BAEDEECDEB
11-20 CDADDDBCBB 
21-30 DBEBBEADEB 
31-40 ABEBCBCCDA 
41-50 BDBCEDAAAE 
51-60 AAABBACECA
THEORY ANSWERS
1a 
i. -Rockets are used for space travels.
-Some rockets are used for war.
ii. ) 
-Satellites are used to get pictures of space that you can’t get on earth because of the clouds and atmosphere. 
-Satellites are used to give a detailed description of the weather.
1b.A dam works when a Hydro power plant capture the energy of falling water to generate electricity. A turbine converts the kinetic energy of falling water into mechanical energy. Then a generator converts the mechanical energy from the turbine into electrical energy.
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2i) total distance = 5m 10m
=15m
2ii) magnitude of his .=
D=sqrt: 5² 10²
D= sqrt: 25 100
D=sqrt: 125
D= 11.18
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4a
i. Pulley
ii. Wheel and axle system
4b)
veiw the digrams
load——>fulcrum——>effort
eg-crowbar
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5)
V1=700cm^3, T1=30dgree-census 273=303k, P1=606mmHg
V2=700-300=400cm^3, T2=47 273=320k
from general gas law
P1V1/T1 = P2V2/T2
606*700/303=P2*400/320
P2=606*700*320/303*400
P2=1120mmHg
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6a. 
i. Sound waves can be heard by the ear because their frequency is high enough to hear. While Radio waves are much longer frequency waves and need electronics to see or hear them. 
ii. Sound waves are produced by oscillations of the air while radio waves are oscillations of photons of light. 
6b. 
1. Using them as lenses, or coating lenses on sunglasses reduces glare, without affecting chromatic integrity (i.e. without adding a colour). 
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8a)
Electric current is the rate of charge flow past a given point in an electric circuit, measured in Coulombs/second which is named Amperes.
8b)
d=30cm,£=1.5*10^-5c r=30cm
30/100=0.3m
V=kE/r=9*10^9*1.5*10^-5/0.3
=13.5*10^4
=13.5*10^5/3
V=4.5*10^5
V=450kv
********************************
9a.
i. Magnets can be demagnetized by placing them in a coil of wire connected to an alternating electric current (a.c.) 
ii. An increase in temperature usually demagnetize the magnetic effect of a magnet.
9b)Energy stored in a capacitor 
E= ½cv²
=½×4×800²
=2×640000
=1280000J
Therefore energy stored = 1280KJ or 1.2MJ
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11)
Tabulate
-Hard Xray-
i)high penetrating power
ii)short wave length
iii)produce high voltage
-soft Xray-
i)low penetrating power
ii)long wave length
iii)produced at low voltage
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(12a) centre of gravity can be define as the point through which the line of action of the weight of the body always passes irrespective of the position of the body.
12b)
C.g = centre of gravity 
:- v= u – gt
Of maximum height v=O – K
O= u-gt 
For vertical component, U =uSin tita 
Therefore O= usin tita- gt
gt =uSin tita
T=uSin tita/g
Where T is the time taken to maximum height
12c)
Taken moment about point A
Cwm = {60*10) (20*60)
Cwm=600 1200
Cwm=1800
Acwm = (20*40) (R3 * 40)
Acwm=800 80R3
At equilibrium, Cwm=Acwm
1800=800 40r3
1800-800=40r3
1000=40r3
R3=1000/40
R3=25N
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(13a) Dew point is the temperature at which the water present in the air is just sufficient to saturate it
(13b)mist is form when the air near the surface of the land cools until it reaches dew point,water vapour originally present in the air begins to condense around tiny suspended dust particles in the air.
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15a )electrical potential is the work required to transfer a unit positive electric charge from an infinite distance to a given point against an electric field

Posted by on June 28, 2016.

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One Response

  1. Bros drop de answer na. Haba! Plsss

    by Mr Dinho on Jun 29, 2016 at 9:36 pm

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