WAEC 2017/2018 EXPO: Physics Objective and Theory Questions And Answers

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[10/04 8:09 am] Naija Communications: 8d (i)pushing someone on a swing.
      (ii)Tuning a radio to a particular frequency.
[10/04 8:09 am] Naija Communications: Question 6
(i)Energy efficient- so far the best light for interior lighting.
(ii)Low production cost (of tubes, not of the ballasts)
(iii)Long life of tubes.
[10/04 8:09 am] Naija Communications: 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.
[10/04 8:33 am] Naija Communications: 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
================================
===
5a)
i)force
ii)length
5b)
by increasing the density mosquitoes lavrva than the density of water
================================
===
6)
i)Energy efficient- so far the best light for interior lighting
ii)Low production cost (of tubes, not of the ballasts)
iii)Long life of tubes
================================
===
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.
================================
[10/04 8:33 am] Naija Communications: 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
[10/04 9:01 am] ‪+234 814 380 1174‬: *WAEC 2017 PHYSICS ANSWER BY PROF.DAVID*
WhatsApp: 08178218615
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
=========================
3 )
i ) Brownian motion
ii ) Atomic size
iii ) Expansion
============================
5a)
i)force
ii)length
5b)
By increasing the density mosquitoes lavrva than the density of water
=================================
6)
(i)Energy efficient- so far the best light for interior lighting.
(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
============================
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
8d (i)pushing someone on a swing.
      (ii)Tuning a radio to a particular frequency.
=========================
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.
*More loading….✍🏼*
[10/04 9:01 am] ‪+234 814 380 1174‬: *WAEC 2017 PHYSICS ANSWER BY PROF.DAVID*
WhatsApp: 08178218615
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
=========================
3 )
i ) Brownian motion
ii ) Atomic size
iii ) Expansion
============================
5a)
i)force
ii)length
5b)
By increasing the density mosquitoes lavrva than the density of water
=================================
6)
(i)Energy efficient- so far the best light for interior lighting.
(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
============================
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.
=========================
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.
Naijacomms.com
*More loading….✍🏼*
[10/04 9:01 am] ‪+234 814 380 1174‬: *WAEC 2017 PHYSICS ANSWER BY PROF.DAVID*
WhatsApp: 08178218615
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
=========================
3 )
i ) Brownian motion
ii ) Atomic size
iii ) Expansion
============================
5a)
i)force
ii)length
5b)
By increasing the density mosquitoes lavrva than the density of water
=================================
6)
(i)Energy efficient- so far the best light for interior lighting.
(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
============================
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
============================
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.
Naijacomms.com
*More loading….✍🏼*
[10/04 9:01 am] ‪+234 814 380 1174‬: 2)
given that U =15 m3 ^-1
R =U * sqr 2h/g
h= 20m
g= 10
R =15* sqr 2*20 /10
R =15* sqr 40/10
R =15* sqr 4
R =15* 2=30 m
R =30m
=============================
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
[10/04 9:01 am] ‪+234 814 380 1174‬: 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
================================
===
5a)
i)force
ii)length
5b)
by increasing the density mosquitoes lavrva than the density of water
================================
===
6)
i)Energy efficient- so far the best light for interior lighting
ii)Low production cost (of tubes, not of the ballasts)
iii)Long life of tubes
================================
===
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.
================================
[10/04 9:01 am] ‪+234 814 380 1174‬: 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
[10/04 9:03 am] ‪+234 814 137 9418‬: 5a)
i)force
ii)length
5b)
By increasing the density mosquitoes lavrva than the density of water
=========================
12ai)Nuclear fission is a nuclear reaction in which a heavy nucleus splits spontaneously or on impact with another particle, with Naijacomms.com for all waec free expo 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.
[10/04 9:04 am] ‪+234 814 137 9418‬: 8d (i)pushing someone on a swing.
      (ii)Tuning a radio to a particular frequency.
[10/04 9:04 am] ‪+234 814 137 9418‬: Question 6
(i)Energy efficient- so far the best light for interior lighting.
(ii)Low production cost (of tubes, not of the ballasts)
(iii)Long life of tubes.
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
=========================
5a)
i)force
ii)length
5b)
By increasing the density mosquitoes lavrva than the density of water
=================================
6)
(i)Energy efficient- so far the best light for interior lighting.
(ii)Low production cost (of tubes, not of the ballasts)
(iii)Long life of tubes.
=========================
8d (i)pushing someone on a swing.
      (ii)Tuning a radio to a particular frequency.
=========================
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.
*More loading….✍🏼*
[10/04 9:04 am] ‪+234 814 137 9418‬: 8b)If their distance and masses are doubled their corresponding force would also be doubled and Naijacomms.com for all waec free expo work done respectively 
I.e.Workdone=Force * distance
Force= Mass * Acceleration 
W= Mg * d
     |
Increase
[10/04 9:04 am] ‪+234 814 137 9418‬: *WAEC 2017 PHYSICS ANSWER BY PROF.DAVID*
WhatsApp: 08178218615
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
=========================
3 )
i ) Brownian motion
ii ) Atomic size
iii ) Expansion
============================
5a)
i)force
ii)length
5b)
By increasing the density mosquitoes lavrva than the density of water
=================================
6)
(i)Energy efficient- so far the best light for interior lighting.
(ii)Low production Naijacomms.com for all waec free expo (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
============================
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
8d (i)pushing someone on a swing.
      (ii)Tuning a radio to a particular frequency.
=========================
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 Naijacomms.com for all waec free expo cadmium that are capable of absorbing many neutrons without themselves fissioning.
*More loading….✍🏼*
[10/04 9:05 am] ‪+234 814 137 9418‬: *WAEC 2017 PHYSICS ANSWER BY PROF.DAVID*
WhatsApp: 08178218615
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
=========================
3 )
i ) Brownian motion
ii ) Atomic size
iii ) Expansion
============================
5a)
i)force
ii)length
5b)
By increasing the density mosquitoes lavrva than the density of water
=================================
6)
(i)Energy efficient- so far the best light for interior lighting.
(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
============================
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.
=========================
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 Naijacomms.com for all waec free expo plutonium. They are composed of chemical elements such as boron, silver, indium and cadmium that are capable of absorbing many neutrons without themselves fissioning.
Naijacomms.com
*More loading….✍🏼*
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
=========================
3 )
i ) Brownian motion
ii ) Atomic size
iii ) Expansion
============================
5a)
i)force
ii)length
5b)
By increasing the density mosquitoes lavrva than the density of water
=================================
6)
(i)Energy efficient- so far the best light for interior lighting.
(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
============================
8b)If their distance and masses are doubled their corresponding force would also be doubled and Naijacomms.com for all waec free expo 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 cornersNaijacomms.com for all waec free expo
============================
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.
Naijacomms.com
*More loading….✍🏼*
[10/04 9:05 am] ‪+234 814 137 9418‬: 2)
given that U =15 m3 ^-1
R =U * sqr 2h/g
h= 20m
g= 10
R =15* sqr 2*20 /10
R =15* sqr 40/10
R =15* sqr 4
R =15* 2=30 m
R =30m
=============================
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 lightingNaijacomms.com for all waec free expo
B ) Low production cost ( of tubes , not of the Naijacomms.com for all waec free expo
ballasts )
C ) Long life of tubes
[10/04 9:05 am] ‪+234 814 137 9418‬: 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
================================
===
5a)
i)force
ii)length
5b)Naijacomms.com for all waec free expo
by increasing the density mosquitoes lavrva than the density of water
================================
===
6)
i)Energy efficient- so far the best light for interior lighting
ii)Low production cost (of tubes, not of the ballasts)
iii)Long life of tubes
================================
===
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 Naijacomms.com for all waec free expo 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.
================================
[10/04 9:05 am] ‪+234 814 137 9418‬: 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.
[10/04 11:22 am] Naija Communications: 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
[10/04 11:22 am] Naija Communications: 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.
[10/04 11:22 am] Naija Communications: 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
=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
[10/04 11:22 am] Naija Communications: 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.
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