2017/2018 NECO GCE EXPO: PHYSICS THEORY AND OBJ QUESTIONS AND ANSWERS NOW AVAILABLE HERE

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Exam Time: Monday 6th Nov. 2017
Physics Paper III & II (Objective & Essay)
2.00 pm – 5.00 pm

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NECO GCE PHYSICS OBJ AND THEORY ANSWERS FROM EXAMHOT.COM
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PHYSICS OBJ:
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1-10: DEEBCDBCDC
11-20: DADBCBBCAA
21-30: EECACCBABC
31-40: BDBDDCBAAA
41-50: EBEACCBDED
51-60: CBCCDECCEA

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PHYSICS THEORY:
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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)
Mass = 1.5g = 1.5/1000 = 0.0015kg
= 0.0015×1.2×40 × 60
= 4326.
Electrochemical equivalence of copper = 0.000000033kgcl^-1
Mass of the copper apparently
= 432 × 0.000000033
= 1.4256 × 10^-6kg
Therefore;
0.0015 = 1.8
1.4256 × 10^-6 = x
X = 0.000000014256 × 1.2/1.4 × 10^6
Actual Current = 1.2 – 0.00014
= 1.999A
= 2.0A

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(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

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(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) 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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(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

 

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

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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)
(i) Light travels as transverse waves and can travel through a vacuum.
(ii) Sound travels as longitudinal waves and needs to travel through a solid, liquid or gas.

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

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

Under derived quantity:
-Density
-Electric current

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

(12c)
(I)
a = (v – u)/t
Where
a = Acceleration
v = Final Velocity
u = Initial Velocity
t = Time

initial velocity.=0m/s
final velocity.=15m/s
time.=4s

a = (15 – 0) / 4
a = 15 / 4
a = 3.75m/s²

(II)
S = ((u + v)/2)t
Where
S = Distance Covered
u = Initial Velocity
v = Final Velocity
t = Time

Initial velocity =0m/s
final velocity =15m/s
time =4s
S = ((0 + 15) / 2) x 4
S = (15 / 2) x 4
S = 7.5 x 4
S = 30m

 

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(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.

(15aii
Accumulator stores energy and can be recharged while Dry cell cannot be recharged and does not stores energy.

(15bi)
It is electroplated to reduce hydrophobic contaminants such as oils which cause the water to bead and break up, allowing the water to drain rapidly.

(15bii)
(i) Increasing the number of turns
(ii) Increasing the magnetic induction

(15c)

 

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(17a)
(i) To minimize convective and radiant heat loss from absorber
(ii) Final magnification of objects.
(iii) Serves as the anode with a negative potential

(17b)
(i) The anode
(ii) The cathode

 

 

 

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