EXCLUSIVE: UPDATED EXPO LEAKED OUT! The 100% Correct Neco Physics Objectives and essay

VERIFY PHY OBJ

 

 1-10.   ADCDEEAEDE

11-20.  EDABDDABCD

21-30.  EECCECBDAA

31-40.  AABAACCBBD

41-50.  CDBCEDACBD

51-60.  CCCBDDDDCE

 

 

1a) Satellite an artificial body placed in orbit
round the earth or another planet in order to
collect information or for communication.

1b) Cosmic (ii) Magnetic field

1c) The artificial satellite is first launched to space
which produces visual signals to Tv stations and
its further transmitted or relayed to individual
house and hence, the 2014 Brazil world cup be
viewed.

2a) do the graph yourself

2b) D = √(x2 – x1)^2
(y2 – y1)^2= √(-3-5)^2
(-4-(-2))^2. = √64 36 = 10unit

3a) Yes fractional force depend on the nature of
the surface

3b) Walking without fractional force depending
on the nature of the surface, there would be
slipping and skidding

4a) The work done is the area of the rectangle *
Area of rectangle = L x B Work done

(I) 2F^1 x d^1 = 2F^1d^1 ( ^ means raise to
power) Work done

(ii) F^1 x d^1 = F^1d^1 Difference in work done
= 2F^1d^1 – F^1d^1 = F^1d^1Nm

4ii) Work done is defined as the minimum energy
required for electrons to be liberated from the
surface of a metal when light is incident onit

b) E= hf but C= F/|, F = C//| , E= hc//| E= 5.5 x
10^-9J, /|= 6.6×10^-34 x 3×10^8/5.5 x 10^-9 /|
=3.6×10^-17 {where J is joule, /| is lander }

5a) 85 – x/ 50 – x = 100 – 0/40 – 0 4(85 – x) = 500
- 10x -4x 10x = 500 – 340 6x = 160 X= 26.67oc

6) V = 3x10m/s From the diagram, T=12s(time
taken to complete one cycle)

6aii) V=F/|, F=1//| , /|= VT { where /| is lander } /|
=3×10^3 x 12 = 3.6×10^4m

6aiii) F=1/t = 1/12= 0.083Hz 8a) E=2.0v,
r=1ohm, R=?, V=1.92v From E= I(R r) also, V=IR,
I=V/R E= V/R(R r) 2R= 1.92R 1.92 2R – 1.92R =
1.92 0.08R = 1.92 R = 1.92/0.08 =24ohms

8a) E=2.0v, r=1ohm, R=?, V=1.92v From E= I(R
r) also, V=IR, I=V/R E= V/R(R r) 2R= 1.92R 1.92
2R – 1.92R = 1.92 0.08R = 1.92 R = 1.92/0.08
=24ohms 9a.) The basic unit of measure of
electricity is known as the Watt. One thousand
Watts are called a kilowatt. OR .the unit is kilowatt
per hour (kwh)/ def 1kwh is the energy
consumed by power consumption of 1kilowatt
during 1hour.

(9b) Two Advantages At high voltages
(i)to ruduce the energy loss in long- distance
transmission,
(ii)also for greater efficiency during long distance
transmissiön. two Advantages at Low Current
(i)to accomodate the use of low using electrical
appliances,
(ii) to promote even distribution of current. 10a)
Natural radioactivity is the spontaneous
distingration of the nucleus of an atom during
which alpha particle or beta particle,or gamma
rays or a combination of any or all the three and
heat (or energy) are released. While Artificial
Radioactivity this is an ordinary material,not
normally radioactivr is made radioactive by
bombarbing it with radioactive particles.

10b) Two Uses Of Radioisotopes. i Radioisotopes
are used in medicine as radiotherapy.
ii. Radioisotopes are used in industry to study
defects in metals and welded joints.
iii. Radioisotopes are used in geological research
for radio-dating

11a) Work function is defined as the minimum
energy required for electrons to be liberated from
the surface of a metal when light is incident on it

11b) E= hf but C= f/| , f=C / /| E= hc / /| , E= 5.5
x 10^-9 J /| = 6.6×10^-34 x 3×10^8 / 5.5 x
10^-9 = 3.6 x 10^-17m

13a ) A vacuum flask, or thermos, does not allow
heat transfer by any of the three ways that heat
can travel. The silver coating on the inner bottle
prevents heat transfer by radiation, and the
vacuum between its double wall prevents heat
moving by convection. The thinness of the glass
walls stops heat entering or leaving the flask by
conduction. The case surrounding the flask
provides additional insulation.

13aii) Cork

13b) Inclined plane (ii) Wheel and axel
13bii)
m=6000kg , h=0.25m , L=0.75m EFF=85% (I) *
V.R of a screw jack = distance move by effort/load
30 x 2 x 3.142 x 0.75/0.25 =565.2 (ii) * M.A =
Eff x VR/100 = 85 x 565.2/100 M.A = 480.42 =
L/E Effort= L/480.42 = mg/480.42 = 6000 x
10/480.2 E= 124.9N
14a) Convex mirror or Converging mirror * It
produce an erect image and has a wide range of
view

14b) A piano have strings of different lenght so
that it can produce different of sound

14bii) F = k/L …. Where F is frequency, L is
length

14c) *choose two – Temperature – Humidity -
frequency of sound in air – wavelength of sound in
air

14cii) fo = 220Hz (open pipe) Ist overtone freq of
open pipe = Ist overtone freq of closed 2fo cp =
3fo cp 2 x 220/3 = 146.67HZ ( fo cp) For Closed
pipe V = 4fl , l=V/4f 330/4×146.67 = 0.56m For
Opened pipe V = 2fl , l = V/2f 330/2×220 =
0.75m
17ai) 1.The absorber is usually a sheet of high-
thermal-conductivity metal with tubes or ducts
either integral or attached. Its surface is painted
or coated to maximize radiant energy absorption
and in some cases to minimize radiant emission.
2.The insulated box, provides structure and
sealing and reduces heat loss from the back or
sides of the collector.

17aii) Flat Plate Solar Collector is the key part of
the flat plate solar water heater. It consists of
absorber, cover glass, insulation, and shell. The
metal absorbing plate with coating is welded on
the red copper pipe. The cold water or the
medium liquid is heated when running through
the pipe. The transparent cover glass allows
visible light to pass through and blocks the the
far infrared. It means the sunlight can pass the
cover glass and reaches the absorber to produce
heat, but the far infrared resulted from the
radiation of heated absorber is blocked and kept
inside. In this way, the heat loss is reduced. And
the heat-absorbing efficiency and the
temperature of the absorber can be increased.
There are usually three kinds of coatings: black
selective coating, black chrome coating and blue
tinox titanium coating. In areas with winter
temperature above 0 ℃, system of direct-heating
of cold water is applicable, but in areas with
winter temperature below 0 ℃, the user could
input medium liquid in the system to heat cold
water indirectly as an alternative. * Material: A)
Cover glass:transparent toughened glass B)
Absorber core:copper and aluminum complex or
all copper C) Pipe: red copper D) Shell/bracket:
aluminum alloy / galvanized steel

17b). One of the main differences between a
telescope and a microscope is that A telescope is
used to view things that are far whereas a
microscope is used to view things that are very
near.

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