Acurate-Phy-Obj
1ABABDBBBBC
11CCCDADCABA
21BCBCCBDACD
31ADBCDACBBB
41BDAACAABCA
SECTION A – ANSWER 5 QUESTIONS
2)
i)used in eye surgery
ii)used for the precise cutting of flat material
iii)used for measuring distances
3)
i)iron
ii)steel
iii)nickel
4a)
Time (t)=4secs
V=0ms^-1
pie call,V^2=U^2+2gh
O^2=20^2+2(-10)h
0=400-20h
20h/20=400/20
h=20m
4b)
the magnitude of the initial speed (u) is equal to the magnitude of the height attained
5)
i)availability of constant sunlight
ii)nearness to power grid
iii)must be closer to both skilled and unskilled labour
6)
P-type semi conductors are created by dopung an intrisic semi conductor with acceptor impurities.
PHYSICS THEORY
SECTION B – ANSWER 3 QUESTIONS
8a)
force is a push or pull which changes a body state of rest or of uniform motion in a straight time
8aii)
i)constant force
ii)field force
8bi)
bodies are streamline to make sure that the surface are in head on contact with the fluid during motion
8bii)
i)aircrafts
ii)ship
8ci)
diagrams
8cii)
mass of bucket =1.3kg
speed of loop(v)=7.0ms^-1
radius(s)=1.2m
(x)acceleration (a)
a=rw^2
v=rw
w=v/r
a=r(v/r)^2
a=rv^2/r^2
a=v^2/r
a=(2.0)^2/1.2=49/1.2
a=40.8ms^-2
b)net force (F)
F=F1-Fg
F=Ma-Mg
F=(1.3*40.-1.3*19i
F=53-04-13
F=40N
(9a)
(i) Coat (Trapped air in between the fabric)
(ii) The hair and the fur of animals are bad conductors of heat and they protect them from cold .
(9b)
-Renewable: Water, corn stalk
-Non-renewable: coal, natural gasgas
(9c)
A closed is a physical system so far removed from other systems that it does not interact with them.
(9d)
Heat required to melt = mc∆ + ml
NB: Not sure of the temperature given, if it is -3°C or -5°C, However, Using -3°C
Heat = (0.1×2200×3)+(0.1×2.26×10^6)
= 226660 J
(9ei)
Given: 75 heart beats in 1 min
Therefore in 1 hour, we have (75×60) heart beats = 4500 heart beats
Also given: 2J of energy is expended in 1 heart beat
Therefore for 4500 heart beats, energy expended = (4500×2) J = 9000J
(9eii)
Energy = mc∆
9000 = (0.25×4200×∆)
9000 = 1050∆
∆ = 9000/1050
Temperature rise = 8.57°C
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(10a)
(i) Plane waves
(ii) Spherical waves
-For plane waves -Their dipper are wooden strip
-For spherical wave - Their dipper are spherical ball
(10b)
White and are actual colours of light because both white and black are centralof additive and substractive
(10c)
A yellow object is illuminated with green liight and when viewed through a yam filter becomes white since the colours consist of both primary and secondary colours which are known as complementary colours
(10d)
f0=V/2l
2f0l=V
l=V/2f0
=330/(2*400)
l=330/800
0.41m
10e)
f=200khz
Period T=1/f
T=(1/200*10^3)s
Period T=5*10^-6s
