2019/2020 WAEC GCE Physics Questions And Answers – Jan/Feb Runz

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2019 WAEC gce Physics expo, 2019/2020 WAEC GCE Physics Answers, 2019 WAEC Gce Physics Questions, WAEC GCE 2019/2020 Physics Answers to questions OBJ/Essay. There are many students who registered for the 2019 WAEC GCE Exams Searching online for 2019 WAEC GCE Physics Answers, WAEC GCE 2019 Physics Answers, WAEC GCE 2019 Agric Expo, WAEC GCE 2019 Physics Objectives Answers, WAEC GCE 2019 Physics Essay Answers, WAEC GCE 2019 Physics Runz, WAEC GCE 2019 Physics questions and Answers. Answers to these questions are here, keep reading.

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WAEC EXAM RUNS 
(PHYSICS 1/2

*Complete Physics obj*
1-10 CAABADACC
11-20 BAADDCBADA
21-30 CCBACBCBAB
31-40 ACADDBBBAC

41-50 BCDABCABCA

PLS TAKE NOTE:

(i) / means division or divide
Examples:
2/2 means 2/2 ie 2 over 2.
—————–
(ii) * means multiplication
Example: 2*2 means 2×2
—————–
(iii) ^ means Raise to power
—————–
(iv) Sqr root means means square root sign ie _/

SECTION A ANS 5QUESTION

================================

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

 

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
==================================

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

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

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

=================

SECTION B ANS 3 QUESION
================================
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.

12iiii
All liquid sodium nuclear fission reactors are devices designed to
maintain a chain reaction producing a steady flow
of neutrons generated by the fission of heavy
nuclei. They are, however, differentiated either by
their purpose or by their design features. In terms
of purpose, they are either research reactors or
power reactors.

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12(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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