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Neco Physics and page

  1.  Monday 23rd Nov
    Paper III & II: Objective & Essay – Physics
    10:00am – 1:00pm
    —————-PHYSICS OBJ
    1-10: BCBDBDCDCD
    11-20: DACBEBABDE
    21-30: CDDDABBBAC
    31-40: CDAEBBCCDC
    41-50: BEEBDBAEEC
    51-60: DDCDADDEBD

[Choose ANY ONE]
-Photocopy machine
-Label maker
-Document scanner


Draw the diagram.

I = 1.26A
t = 4800s
m = ?
Z = 3.3×10^-⁴gc-¹
m = ZIt
m = 3.3×10^-⁴×1.26×4800
m = 1.996g

Velocity is defined as the rate of change of distance moved in a specific direction or the rate of change of displacement.

U = 0m/a
V = 20ms-¹
t1 = 20s
t2 = 30s
t3 = 10s

Draw the diagram

[Choose ONLY ONE]
-They are both scalar quantity.
-They are both connected with work.

R0 = 25ohms
R100 = 100ohms
R = ?
Tita = 67°c
Tita= Rtita-R0/R100-25 × 100
67 = R – 25/100 – 25 × 100
67 = (R0 – 25)/75 × 100
R0 – 25 = 67 × 75/100
Rtita – 25 = 50.25
Rtita = 50.25+25
Rtita = 75.25ohms
It simply means that the ratio of resistance and impedance is 1 and the maximum power is obtained in such circuit.

V² = Vr² + Vc²
15² = 12² + Vc²
225 – 144 = Vc²
V = √81
Vc = 9
(i) Weight
(ii) Upthrust.
(iii) Viscous force.

Both viscous force and upthrust acts in upward direction while weight act downward in order to balance the force

4 A 12 1
He + Be –> X + Y + Z
2 A B C

A = 9
B = 6
C = 1

Z = 0
e ie Beta particles.

Nuclear fusion
W = v + u

(i) Friction.
(ii) Upthrust.

(i) Force causes motion
(ii) Force causes stress/strain

Draw the diagram [https://i.imgur.com/j8jNZmi.jpg]

Draw the diagram [https://i.imgur.com/j8jNZmi.jpg]
(i) Taking moment about pivot
CW moment = ACW moment
36×25 = X×15
X = 36×25/15 = 60g

Draw the diagram[https://i.imgur.com/j8jNZmi.jpg]
60 × X = 36 × (30 – X)
60X = 1080 – 36x
96X = 1080
X = 1080/96 = 11.25
Distance = 11.25 from the zero end.

(i) Dew
(ii) Mist

(i) Both require the supply of heat.
(ii) Vapour is expelled when both processes occur.

An object initially at a height, say H has a tiny potential energy. As it falls and now at a height say h, the potential energy reduces and kinetic energy increases. The kinetic energy because it is equal to the P.E at height H when the object just strikes the ground.
NB: At any point, mechanical energy is conserved.

Given V.R = 5, Load L = 500N
Workdone against friction
= Total workdone – work output by system.
= 7200 – (500 × 12)
= 7200 – 6000
= 1200J

Efficiency = work output/work input × 100%
= 6000/7200 × 100%
= 83.33%

Given y = Asin2pie(t/T – x/lander)

T represents period.
Lander represents wavelength.

T = 2pie/w
T = 1/f

(i) Microscope.
(ii) Telescope.

Refraction involves two media, while reflection involves one medium.

Frequenxy of wave f = v/lander

Refractive index of water = speed in deep water/speed in shallow water.
= 0.8/0.6 = 4/3
The potential difference between any two points in an electric field is defined as the work done in moving a positive charge of 1 coulomb from one point in the electric field to another.

Diagram [https://i.imgur.com/uSOm3a3.jpg]

Given: Power p = 1200w, Voltage v = 220v
(i)Resistance, R = v²/p = 220×220/1200 = 40.3ohms

Energy consumed by one heater = Power × time
= 1200 × 5
= 6000watt-hours
= 6kWh
Energy consumed by 5 heaters = 5 × 6 kWh
= 30kwh
Cost = 30 × 4
= #1,020.00

Posted by on November 23, 2020.

Categories: Neco

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