*2017 VERIFIED PHYSICS THEORY AND OBJECTIVE BY COOLBOY*
08035452768
VERIFIED PHYSICS OBJ
1B
2B
3C
4A
5D
6A
7A
8A
9B
10B
11B
12B
13D
14C
15B
16D
17C
18-
19C
20D
21A
22B
23C
24D
25C
26C
27C
28D
29A
30C
31A
32C
33C
34B
35C
36D
37A
38-
39B
40C
41A
42-
43D
44D
45A
46A
47D
48B
49D
50C
08035452768
COOLBOY
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
=============================
5a)
i)force
ii)length
5b)
by increasing the density mosquitoes lavrva than the density of water
=================================
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
================================
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
==================================
SECTION B ANS 3 QUESION
================================
11a A dielectric is an electrical insulator that can be polorised by an applied electric field.
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:
Rt = 2 2 (2*2/2 2)
Rt = 4 1
Rt = 5ohms
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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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