Waec 2017 PHYSICS Obj And Theory Answers – May/June Expo

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EDUCATION » Examinations
Waec 2017 PHYSICS Obj And Theory Answers – May/June Expo
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  Chidusky (m)
2 days ago
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VERIFIED PHYSICS OBJ
1BBCADAAABB
11BBDCBDCCCD
21ABCDCCCDAC
31ACCBCDAABC
41AADDAADBDC
===========

1)decrease in height (h)
increase in time (t)
this shows that distance changes with time

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

3i) Brownian Motion
II) Atomic Size
Iii) Expansion

4) Let the unstrength legth be Lo
Using F=Ke
I.e. F/e=K
F1/e1=F2/e2=k
4/14-Lo=6/4
6(14-Lo)=16
84-6Lo=16
84-16=6Lo
6Lo=68
Lo=68/16
Lo=11.33cm
================================

5a)
i)force
ii)length

5b)
By increasing the density mosquitoes lavrva than the density of water
================

6i)Energy efficient- so far the best light for interior lighting.I
ii)Low production cost (of tubes, not of the ballasts)
iii)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
================

8a) It is a straight line graph
II) The gradient is the velocity

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.
================================

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

10bi)Prismatic binoculars is used to see round corners
II) Prism Periscope is used to bend and reflect light

10bii)i) Refractive index of the glass prism
II) The angle of the incident of ray
================================
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
================================

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)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.

12aii)b)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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