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100% NECO Gce 2017 Real ( physics obj and essay ) Answers Available Here..
Author: Mr. Dan
Posted on: 14:24:35 Sun, 05 Nov 2017


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100% NECO Gce 2017 Real ( physics obj and essay ) Answers Available Here..
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Physics OBJ:
1-10: DEEBCDBCDC
11-20: DADBCBBCAA
21-30: EECACCBABC
31-40: BDBDDCBAAA
41-50: EBEACCBDED
51-60: CBCCDECCEA



PART I
(Answer only SIX from this section)
NOTE: No 1 is compulsory!!!

(1ai)
-To Maximize the efficiency of the machine
-To Detect machine issues early, before they become problems

(1aii)
-Electroplating

(1b)

=====================================

(2)
Radius=5m
Acceleration=1200m/s^2
From a=v^2/r
v^2=ar
v^2=1200*5
v=root6000
v=77.46m/s

===================================

(3a)
A couple is a system of forces with a resultant (net or sum) moment but no resultant force. A better term is force couple or pure moment. Its effect is to create rotation without translation, or more generally without any acceleration of the centre of mass.

(3b)
(i) Opening and closing the cap of a bottle
(ii) Turning of a water tap

====================================


(4a)
The statement: The linear expansivity of copper is 0.000017k^-1 means that, A unit length of copper will expand in length by a fraction 0.000017k^-1 of the original per Kelvin rise in temperature.

(4b)
Cubic expansivity of copper = 3α
=y = 3a
y = 3×0.000017k^-1
y = 5.1×10^-5
y = 5.1×10^-5k^-1

=====================================


(6a)
Wavelength is the distance between successive crests of a wave, especially points in a sound wave or electromagnetic wave.

======================================


(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 while Sound travels as longitudinal waves and needs to travel through a solid, liquid or gas.

=====================================


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

(8ii)
(i) Plate area
(ii) Plate spacing 
(iii) Dielectric material

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PART II
(Answer only FOUR from this section)

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

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

Under derived quantity:
-Density 
-Electric current 

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

(12c)
(I)
T = 4s
U = 0
V = 15m/s
Acceleration a = vt²
a = 15×4²
a = 15×16
a = 240m/s²

================================


(15a)
Electrical conductivity is the rate at which heat passes through a specified material, expressed as the amount of heat that flows per unit time through a unit area with a temperature gradient of one degree per unit distance.

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