100% Verified Neco Gce 2017/2018 Physics Paper III & II (Objective & Essay) Questions And Answers Now Available

*NECO GCE PHYSICS OBJ AND THEORY*

1-10 DEEBCDEBCA
11-20 DECBCABCDE
21-30 EADACD-A-B
31-40 BDBDDCBAAA
41-50 ECEACCBDED
51-60 CBCCDECCBA

(14ai)
-Sound is produced from vibrating bodies
-The speed of sound increase as the temperature increases

(14aii)
-Exploration of gas and oil
-Detection of submaring

(14b)
TABULATE
Plane mirror|Convex mirror
-Image is the same size as object|Image is diminished
-Image is as far behind the mirror as the object is in the front of the mirror|Image is formed between poles and the principal focus

(14ci)
-Long sightedness

(14cii)
DRAW THE DIAGRAM

(14d)
(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

(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

(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

(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

(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) 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

=========

(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)
(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.

===========

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

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

1a)

I)

Regular maintenance is essential to keep machines and the work environment safe and reliable.

II)

It helps to eliminate workplace hazards.

1aii)

Electrolysis can be used for electroplating of metals.

+++++++++++++++++++++++

3a)

couple is a system of forces with a resultant (a.k.a. net or sum) moment but no resultant force. 

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
+++++++++++++++++++++++

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)

In plane mirror, if the object is
upright, the image is also upright, of same
size and does not change in size by moving
the mirror towards or away from the face.
*While* in concave mirror, if the object is
upright, the image is also upright but
magnified and increases in size by moving the
mirror away from the face.

+++++++++++++++++++++++

6a)wavelength of a is the spatial period of the wave I.e the distance over which the wave’s shape repeats, and thus the inverse of the spatial frequency.

7a

Critical angle c is the incident angle in the sender medium when the angle of refraction in the less medium is 90%.

7b
Sound waves are longitudinal wave(they travel in the same direction as the vibration)
While
Light wave are transverse waves (they travel at right angles to the vibration)

8a)i)wrapping the coil around an iron core.

II) adding more turns to the coil.

III) increasing the current flowing through the coil.

11) E = hf₀ + 0.5[mv²]
Where
E = Total energy of a single photon of incident light
h = Planck’s Constant = 6.63 x 10^-34
f₀ = Threshold Frequency
v = Velocity

threshold frequency.=4.5×10^-7

velocity.=3.8×10^-8

E = 6.63 x 10^-34 x 0.0000045 + 0.5[1 x 3.8e^-7²]

E = 2.9835e-39 + 0.5[1 x 1.4442e-13]

E = 2.984e-39 + 7.220e^-14

E = 7.22e^-14

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

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
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
________________________

15a)

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.

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