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Neco Gce 2017 Physics Obj And Theory Answers – Nov/Dec Expo
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Chidusky
Chidusky (m)
0 year ago
NECO GCE - PHYSICS ANSWERS
Exam Time: Monday, 6th November, 2017
Physics (Theory And Obj)
2pm – 5pm
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KEEP REFRESHING THIS PAGE
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Physics OBJ:
1-10 DEEBCDEBCA
11-20 DECBCABCDE
21-30 EADACDCAAB
31-40 BDBDDCBAAA
41-50 ECEACCBDED
51-60 CBCCDECCBA
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SECTION B - ANSWER 4 QUESTIONS

15ai)
Electrical conductivity the degree to which a specified material conducts electricity, calculated as the ratio of the
current density in the material to
the electric field which causes the
flow of current.
15aii)
-Low internal resistance Rechargeable
-Has high voltage (2.0V)
-Supply higher current

15bi)
-To prevent it from rusting
15bii)
-the magnetic field is made stronger
-the area of the coil is mereased
==≠==================

(12a)
(i)It’s weight
(ii) The upthrust of the fluid to which it fluts

(12bi)
Draw a table
Fundamental quantites:
-Velocity
-Time

derived quantity:
-Density
-Electric current

(12bii)
(i) Reducing the contact between the surfaces.
(ii) Application of grease

(12ci)
a=15/4
a=3.75m/5^2

(12cii)
total distance travelled
j=ut+1/2
a+2=0*4+1/2*3.75*(4)^2
0+1/2*3.75*8
a=30m/s
===================


SECTION A - ANSWER 6 QUESTIONS(COMPLETED)
(1ai)
-Regular maintenance is essential to keep machines and the work environment safe and reliable.
-It helps to eliminate workplace hazards.

(1aii)
Electrolysis can be used for electroplating of metals. expand in length by a fraction

(1b)
I=m/zt=0.0015/3.3*10^-7*2400
I=0.0015/3.3*10^-7*24*10^3
I=0.0015/7.92*10^-4
I=1.5*10^-3/7.92*10^-4
I=0.19*10^3+4
I=0.19*10
I=1.9
I=0.7A
=============================

(2)
radius=5m
acceleration=1200m^2
from a=v^2/r
v^2=9*r
v^2=1200*5
v^2=6000
v=sqr6000
v=77.46m/s
============================

(3a)
A couple is a pair of forces, equal in magnitude, oppositely directed, and displaced by perpendicular distance or moment.

(3b)
(i)The forces exerted by one's hand on a screw-driver
(ii)The forces exerted by the tip of a screw-driver on the head of a screw
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(7a)
critical angle is the angle of incidence beyond which rays of light passing
through a denser medium to the
surface of a less dense medium
are no longer refracted but totally
reflected.

(7b)
-Light travels as transverse waves and can travel through a vacuum.
-Sound travels as longitudinal waves and needs to travel through a solid, liquid or gas.
==============================

(8a)
(i)wrapping the coil around an iron core.
(ii)adding more turns to the coil.
(iii)increasing the current flowing through the coil.

(8b)
(i)plate area
(ii)Plate spacing
(iii)Dielectic material
================================

(10a)
Tabulate
-Solids
(i)they dont move around
(ii)they are rigid and dont flow
-Liquids
(i)liquids slosh around
(ii)the maintain the shape of their container

(10b)
diffusion


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