¶¶ Neco Gce 2017 Physics Obj And Essay Solution Answer – Nov/Dec Expo
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Physics OBJ
1-10 DEEBCDEBCA
11-20 DECBCABCDE
21-30 EADACDCAAB
31-40 BDBDDCBAAA
41-50 ECEACCBDED
51-60 CBCCDECCBA
*NECO GCE PHYSICS OBJ AND THEORY*
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.
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3a)
couple is a system of forces with a resultant (a.k.a. net or sum) moment but no resultant force.
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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)
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.
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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.
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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)
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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
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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
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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
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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)
T = 4s
U = 0
V = 15m/s
Acceleration a = vt²
a = 15×4²
a = 15×16
a = 240m/s²
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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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