Physics obj
1-10 CAABADACC
11-20 BAADDCBADA
21-30 CCBACBCBAB
31-40 ACADDBBBAC
41-50 BCDABCABCA

SECTION A ANS 5QUESTION

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1)
decrease in height (h)
increase in time (t)
this shows that distance changes with time
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3)
i)Brownian motion
ii)Atomic size
iii)Expansion

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2)
given that U=15m3^-1
R=U* sqr2h/g
h=20m
g=10
R=15*sqr2*20/10
R=15*sqr40/10
R=15*sqr4
R=15*2=30m
R=30m

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4)
L1=14cm F1=4N,F2=6N
L2=4cm, Lo=?
Using hooke’s law
4/14-Lo*6/4-Lo
4(4-Lo)=6(14-Lo)
16-4Lo=64-6Lo
-4Lo+6Lo=64-16
2Lo=48
Lo=48/2
Lo=24Cm

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5a)
i)force
ii)length
5b)
by increasing the density mosquitoes
lavrva than the density of water

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6)
A)Energy efficient- so far the best light for
interior lighting
B)Low production cost (of tubes, not of the
ballasts)
C)Long life of tubes

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7)
i)It requires low voltage sources for it to
function
ii)It cannot be easily broken
iii)It is cheaper and quite easy to
manufacture

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8b)
If their distance and masses are doubled
their corresponding force would also be
doubled and the work done respectively
I.e.Workdone=Force * distance
Force= Mass * Acceleration
W= Mg * d
|
Increase

8c)
-Acceleration due to gravity
– At maximum height, final velocity is zero
8d)
i)pushing someone on a swing.
ii)Tuning a radio to a particular frequency.

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10a)
A wave front is an imaginary surface
passing through the points of a medium
oscillatory in phase

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11aii) GIVEN: A = 9.6 * 10^-3 M^2
d = 2.25 * 10^4
Eo = 8.85 * 10^-12 F/m
Er = 900
C = /
using; C = EoErA/d
capacity, C = 8.85*10^-12 * 900 *
9.6*10^-3/2.25 * 106-4
C = 33984 * 10^-11
C = 3.3984 8 10^7 F
C =0.344F

11bi) A voltmeter has a higher resistance
because it is designed to limit the flow of
current to practically zero to avoid voltage
drop or less across it.
11bii) combined resistance Rt
Rt = (400 * 400/400 + 400) + (800 * 800/800+
800)
Rt = 200 + 400
Rt = 600ohms
current supplied by battery = r/Rt
= 6/600
= 0.01A
voltage drop across the resistance = 200 *
0.01
=2V
therefore the voltage reading is 6 -2
= 4V
11c) Equivalent resistance is br /> Rt = 2+2+(2*2/2+2)
Rt = 4+1
Rt = 5ohms
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SECTION B ANS 3 QUESION

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12ai)
Nuclear fission is a nuclear reaction in
which a heavy nucleus splits spontaneously
or on impact with another particle, with
the release of energy.

12aii)
A graphite reactor is a nuclear reactor that
uses carbon as a neutron moderator, which
allows un-enriched uranium to be used as
nuclear fuel.

12aiii)
Boron rods are used in
nuclear reactors to control the fission rate
of uranium and plutonium. They are
composed of chemical elements such as
boron, silver, indium and cadmium that are
capable of absorbing many neutrons
without themselves fissioning.

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COMPLETED

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