Author: tdpel

WAEC Business Management Essay Objective Question And Answer 2021

Answer all the questions.

Each question is followed by four options lettered A to D. Find the correct option for each question. Shade in pencil on your answer sheet the answer space which bears the same letter as the option you have chosen. Give only one answer to each question.

Think carefully before you shade the answer spaces; erase completely any answers you wish to change. Do all rough work on this question paper. Now answer the following questions.

1. A business organization whose source of capital is from government subvention or grants is a
A. co-operative society.
B. public corporation.

C. public limited liability company.
D. small-scale enterprise.

2. State-owned enterprises must at least break-even. This means
A. their prices must be affordable.
B. N their profit must exceed their operational cost.

C. they must generate revenue to just cover cost.
D. they must maximize profit.

3. A person who wants information about the history and viability of a company for the purpose of buying shares must look for the
A. articles of association.

B. proposal.
C. prospectus.

D. regulation of a company.

4. An effective way to enhance co-ordination in an organization is through
A. adequate planning.
B. committee meetings.

C. regular delegation.
D. staff motivation.

5. The exchange of services between two countries is
A. balance of trade.
B. invisible trade.

C. terms of trade.
D. visible trade.

6. The last element in the channel of distribution is the
A. consumer.
B. distributor.

C. importer.
D. wholesaler.

7. Governments can protect infant industries from foreign competition by
A. giving them loans.
B. increasing excise duties.

C. increasing tariffs.
D. reducing the exchange rates.

8. An investor who buys shares at lower prices hoping to sell at a higher price is
A. an agent.
B. a bear.

C. a bull.
D. a jobber.

9. Which of the following taxes is a component of customs duty?
A. Income tax
B. Excise duty

C. Export duty
D. Sales tax

10. An exporter who deals in tangible goods is engaged in
A. counter trade.
B. entrepot trade.

C. invisible trade.
D. visible trade.

Essay

1.1 Meaning and Process of
Management

1.2 Forms of Business
Organization

1.3 Business and Society

1.1.1 Meaning of Management and
administration

1.1.2 Basic Functions of Management
1.1.3 Levels of Management

1.1.4 Types and Roles of Managers 1.1.5 Difference between Administration
and Management

1.2.1 Meaning of Business Organization
1.2.2. Identification of Major Forms: (Sole

Proprietorship, Partnership, (Sole Proprietorship,
Limited Liability Company, Public
orations, Co-operative society) Co-operative society) Company, Public orations, Co-operative society)
1.2.3. Procedures for the

formations/Characteristics,
advantages and disadvantages of each
form.

1.2.4 Causes of business failure.

1.3.1 Meaning of Business Environment
Business Environment, Business Environment, Environment Business Environment,
1.3.2 Forces in the Businesses Environment Environment

1.3.3 Ethical, legal and social
responsibilities of Businesses. responsibilities of Businesses.
1.3.4 Primary and Secondary stakeholders –
meaning and differences.

1.3.5 Responsibilities of businesses towards

2.1.1 Meaning and importance of planning of planning
2.1.2 Steps in planning, Types of planning, Limitations to planning
.2.1.3 Meaning and of planning, Limitations

to planning
2.1.3 Meaning and importance of decision
making. importance of decision making. planning importance of decision making. stakeholders. businesses towards stakeholders. 1.

TOPICS NOTES

2.2 Organizing

2.3 Directing

2.4 Controlling 2.1.4 Step in the decision making process.
2.1.5 Types of (Programmed and Non-programmed) decisions. Non-programmed) decisions. making process. 2.1.5 Types of (Programmed and Non-programmed) decisions.

2.1.6 Levels of management decisions.

2.2.1 Meaning, importance and activities of organizing
2.2.2 Principles of organizing, Organizational structure and Organizational chart

2.2.3 Centralization and decentralization-meaning differences, advantages and disadvantages.
2.2.4 Meaning and benefits of delegation.

2.2.5 Reasons why managers do not delegate
2.2.6 Reasons why subordinates do not accept Delegation

2.2.7 Guidelines for delegation, etc.

WAEC Physics obj Objective Essay 2021 Questions, Answers

WAEC Physics questions and answers

Objective answer

1-10: DACAACBBCC

11-20: BDBABBACAC

21-30: BCBACBBACA

31-40: BDDDDACCCA

41-50: AAAABBCBBC

Essay answers

(1)
Original length Lo= 3m
Extension e = 310 = 3*3= 9m

F×e
F=ke where k = 982.3NM-²
F=982.3*9=8,840.7N

The five that produce the extension F = 8.840.7N

(2a)
Flat metal plate are mainly used to collect heat for space heating in solar panels for heat transfer.

(2b)
Thermal insulator is used for reduction of heat transfer between objects in thermal contact

(2c)
tubes is a device that controls electric current flow in a high vacuum between electrodes to which an electric potential difference has been applied.

(3a)
highly purified silica glass.

(3b)
To confine the optical signal in the core the refractive index of the core must be greater than that of the cladding.

(5)
Escape velocity = VE
Radius of the earth = R

Acceleration due to gravity = 10ms²
Escape velocity Be=√2R

VE=√2*10R
VE=√20R

(6)
Angle at horizontal θ = 30°
Time of light , T = 25sec

Velocity of projection u = ?
But T=2using sinθ/g

25= 2u*sin30/10
25=0.5u/5

0.5u=125
U=125/0.5

=250ms-¹

(7)
(i)Coherence

(ii)Directionality
(iii)Monochromatic

(8ai)
A torque is defined as a measure of the force that can cause an object to rotate about an axis

WAEC Physics Questions 2021 and Answers
(8aii)

Factors that determine torque are;
– The magnitude of the force

– The radius
– The angle between the force and the lever arm

(8bi)
Free fall simply means the act of which are objects fall freely under the influence of gravitational force. An object under free fall does not encounter air resistance

(8bii)
Height of tower H = 40.0m
Velocity v = 10.0m/s, time t= ? , g=10.0m/s

Using the relation
S= ut + 1/2gt^2

H= ut + 1/2gt^2
40= 10t + 1/2*10t^2
4= t + t^2/2

= t^2 + 2t – 8=0 ( solving quadratically)
= (t+4)(t-2)=0

t+4=0 or t-2=0
t= -4 or t=2

Therefore time to fall on the ground t=2s

(8c)
R.d of oil =R1 = 0.72

R.d of water = R2=1.00

R.d of liquid= R1/R2= 0.72/1 = 0.72

R.d = density of wood(P1)/density of water(P2)
0.72=P1/1.00

P1= 0.72*1.00=0.72g/cm³
But density of wood= mass of wood/volume of wood

0.72= mass of wood/8*8*8
Mass of wood = 0.72*512 = 368.64g

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The Tutor-General/Permanent Secretary, Education District I, Mrs. Titilayo Solarin (standing) addressing the students of the District on resumption for a new academic session on Monday in Agege.The Tutor-General/Permanent Secretary of Education District 1, Mrs. Titilayo Solarin, has challenged students within the district to stay committed to their studies in order to excel as a new academic session commenced on Monday in public and private schools across the State.

Addressing students, teachers and parents at a brief welcome back event at the Government Secondary School, Agege, Lagos, Mrs. Solarin implored parents to be steadfast in the development of their children by prioritising their upbringing, especially during West African Examinations WAEC.

Her words: “Parents should play their roles effectively to ensure that their children excel in life. They should attend ‘Open-Day’ to monitor how their children are faring, buy necessary textbooks for them and be directly involved in the learning activities of their children”.

She also advised the teachers to invest in personal development to complement the capacity enhancement programmes already initiated by the State Government for all teachers in public schools, noting that there would be several academic competitions during this session.

The TG/PS underscored the need for students and teachers to be well-prepared to win laurels from the competitions, saying “I want to encourage our school administrators and teachers to start preparing ahead by organising inter-school debates among themselves knowing that there is no gain, without pain, hence they should sacrifice today, to enjoy tomorrow”.

She thanked Governor Babajide Sanwo-Olu for his support to the education sector, through the provision of new school structures, renovation of existing ones, and equipping laboratories and libraries public schools, stressing that there are no more excuses for laxity or non-performance by anyone in government-owned schools.

Solarin also cautioned against the abuse of internet usage, enjoining everyone to use it wisely and for good reasons, pointing out that as much as the internet provides an avenue for learning, its abuse can also stand as a hindrance to learning.

A Principal of one of the schools in the District, Mrs. Olamide Adewale, solicited the cooperation of parents in monitoring their children alongside the school authority, noting that such collaboration helps instil morals in students.

She expressed hope that with the level of the teachers’ preparedness to impart knowledge, the new academic session would be better than the previous ones in terms of performance.

As part of the resumption day exercise, the TG/PS alongside some other officials of the District inspected school classrooms and expressed satisfaction with the turnout of the students despite the rains, maintaining that the students demonstrated a high sense of commitment on the first day of resumption.

Boris Sanchez, a television anchor from the United States rose to fame as a CNN White House correspondent. The host reported on the most recent developments concerning former President Trump, visits of world leaders, and various events related to the country’s political life. He recently joined “New Day Weekend” as a co-anchor.

Boris Sanchez’s bio reveals the most interesting facts you cannot miss learning.
Profile summary
Full name: Boris Sanchez
Gender: Male
Date of birth: 15 November 1985
Age: 36 years (as of 2021)
Zodiac sign: Scorpio
Place of birth: Havana, Cuba
Current residence: Washington, DC, USA
Nationality: American
Ethnicity: Cuban
Religion: Christianity
Sexuality: Straight
Height in feet: 6’1”
Height in centimetres: 185
Weight in kilograms: 75
Weight in pounds: 165
Body measurements in inches: 44-32-40
Body measurements in centimetres: 112-81-102
Shoe size: 8
US Hair colour: Dark brown
Eye colour: Dark brown
Marital status: Married
Boris Sanchez’s partner: Jennifer Piekut
Siblings: 1
Education: Miami Dade College, Syracuse University
Profession: CNN anchor and correspondent
Instagram: @borissancheztv
Twitter: @Boris_Sanchez

The anchor was born in Havana, Cuba. Later, Boris Sanchez’s parents moved to Miami, Florida, the USA.

According to his Instagram, he has a sister named Leslie.

According to his Twitter, Boris Sanchez’s birthday is on 15 November. His Instagram states that the anchor was born in 1985. As of 2021, Boris Sanchez’s age is 36 years.

He applied to Syracuse University after graduating from Miami Dade College. During his studies, he worked as an intern at Miami NBC affiliate WTVJ. B. Sanchez graduated from the institution in 2009 with a Bachelor’s Degree in Broadcast Journalism and International Relations.

He began his television career as an anchor for KRCR’s weekend editions in Redding, California. Sanchez hosted the FOX 31 Denver 10 p.m. newscast from 2012 to 2015.

His creative activity also included a series of stories about the implementation of Amendment 64. As a result of his hard work and dedication to news reporting, he received a 2015 Heartland Regional Emmy Award.

Sanchez began his career as a CNN reporter in June 2015, working as a journalist in New York. He was a CNN White House correspondent for a long time. He reported on the most important news about former President Trump and his administration’s decisions.

In 2016, he moved back to his hometown to cover breaking news. He was among the first journalists to report on the Orlando Pulse Nightclub massacre and riots in Charlotte, N.C., following the shooting of an African-American man by police the same year. Aside from reporting on political events, he also covered natural disasters: Flooding in Louisiana, Hurricane Matthew in Northern Florida, Earthquake in Ecuador.

In 2017, he covered the Fort Lauderdale Airport shooting. The same year, he went to Quebec and other Canadian cities to highlight Trump’s visits across the country. In May 2019, he went to Japan to cover President Trump’s visit. In April 2021, he joined New Day Weekend as a co-anchor.

Who is Boris Sanchez married to?

For a long time, the anchor kept his relationship hidden from the media, which led to numerous Boris Sanchez gay rumours.

Boris Sanchez’s wife’s name is Jennifer Piekut. They got married in 2016. Unfortunately, there is no information providing more details about Boris Sanchez’s spouse, her age, and profession.

When it comes to Jennifer Piekut and Boris Sanchez’s children, the couple does not have any own.

The anchor is of Cuban descent and holds American nationality. Although he now lives in the United States, Boris Sanchez has not forgotten his Cuban heritage. On his Instagram, he frequently posts photos with captions about his childhood, his grandmother’s dream, and his parents, all of which shaped his perspective on life values.

2021 WAEC Physics Objective obj Essay Question And Answer

WAEC Physics questions and answers

Objective answer

1-10: DACAACBBCC

11-20: BDBABBACAC

21-30: BCBACBBACA

31-40: BDDDDACCCA

41-50: AAAABBCBBC

Essay answers

(1)
Original length Lo= 3m
Extension e = 310 = 3*3= 9m

F×e
F=ke where k = 982.3NM-²
F=982.3*9=8,840.7N

The five that produce the extension F = 8.840.7N

(2a)
Flat metal plate are mainly used to collect heat for space heating in solar panels for heat transfer.

(2b)
Thermal insulator is used for reduction of heat transfer between objects in thermal contact

(2c)
tubes is a device that controls electric current flow in a high vacuum between electrodes to which an electric potential difference has been applied.

(3a)
highly purified silica glass.

(3b)
To confine the optical signal in the core the refractive index of the core must be greater than that of the cladding.

(5)
Escape velocity = VE
Radius of the earth = R

Acceleration due to gravity = 10ms²
Escape velocity Be=√2R

VE=√2*10R
VE=√20R

(6)
Angle at horizontal θ = 30°
Time of light , T = 25sec

Velocity of projection u = ?
But T=2using sinθ/g

25= 2u*sin30/10
25=0.5u/5

0.5u=125
U=125/0.5

=250ms-¹

(7)
(i)Coherence

(ii)Directionality
(iii)Monochromatic

(8ai)
A torque is defined as a measure of the force that can cause an object to rotate about an axis

WAEC Physics Questions 2021 and Answers
(8aii)

Factors that determine torque are;
– The magnitude of the force

– The radius
– The angle between the force and the lever arm

(8bi)
Free fall simply means the act of which are objects fall freely under the influence of gravitational force. An object under free fall does not encounter air resistance

(8bii)
Height of tower H = 40.0m
Velocity v = 10.0m/s, time t= ? , g=10.0m/s

Using the relation
S= ut + 1/2gt^2

H= ut + 1/2gt^2
40= 10t + 1/2*10t^2
4= t + t^2/2

= t^2 + 2t – 8=0 ( solving quadratically)
= (t+4)(t-2)=0

t+4=0 or t-2=0
t= -4 or t=2

Therefore time to fall on the ground t=2s

(8c)
R.d of oil =R1 = 0.72

R.d of water = R2=1.00

R.d of liquid= R1/R2= 0.72/1 = 0.72

R.d = density of wood(P1)/density of water(P2)
0.72=P1/1.00

P1= 0.72*1.00=0.72g/cm³
But density of wood= mass of wood/volume of wood

0.72= mass of wood/8*8*8
Mass of wood = 0.72*512 = 368.64g

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WAEC Physics 2021 Question And Answer For Objective And Essay

WAEC Physics questions and answers

Objective answer

1-10: DACAACBBCC

11-20: BDBABBACAC

21-30: BCBACBBACA

31-40: BDDDDACCCA

41-50: AAAABBCBBC

Essay answers

(1)
Original length Lo= 3m
Extension e = 310 = 3*3= 9m

F×e
F=ke where k = 982.3NM-²
F=982.3*9=8,840.7N

The five that produce the extension F = 8.840.7N

(2a)
Flat metal plate are mainly used to collect heat for space heating in solar panels for heat transfer.

(2b)
Thermal insulator is used for reduction of heat transfer between objects in thermal contact

(2c)
tubes is a device that controls electric current flow in a high vacuum between electrodes to which an electric potential difference has been applied.

(3a)
highly purified silica glass.

(3b)
To confine the optical signal in the core the refractive index of the core must be greater than that of the cladding.

(5)
Escape velocity = VE
Radius of the earth = R

Acceleration due to gravity = 10ms²
Escape velocity Be=√2R

VE=√2*10R
VE=√20R

(6)
Angle at horizontal θ = 30°
Time of light , T = 25sec

Velocity of projection u = ?
But T=2using sinθ/g

25= 2u*sin30/10
25=0.5u/5

0.5u=125
U=125/0.5

=250ms-¹

(7)
(i)Coherence

(ii)Directionality
(iii)Monochromatic

(8ai)
A torque is defined as a measure of the force that can cause an object to rotate about an axis

WAEC Physics Questions 2021 and Answers
(8aii)

Factors that determine torque are;
– The magnitude of the force

– The radius
– The angle between the force and the lever arm

(8bi)
Free fall simply means the act of which are objects fall freely under the influence of gravitational force. An object under free fall does not encounter air resistance

(8bii)
Height of tower H = 40.0m
Velocity v = 10.0m/s, time t= ? , g=10.0m/s

Using the relation
S= ut + 1/2gt^2

H= ut + 1/2gt^2
40= 10t + 1/2*10t^2
4= t + t^2/2

= t^2 + 2t – 8=0 ( solving quadratically)
= (t+4)(t-2)=0

t+4=0 or t-2=0
t= -4 or t=2

Therefore time to fall on the ground t=2s

(8c)
R.d of oil =R1 = 0.72

R.d of water = R2=1.00

R.d of liquid= R1/R2= 0.72/1 = 0.72

R.d = density of wood(P1)/density of water(P2)
0.72=P1/1.00

P1= 0.72*1.00=0.72g/cm³
But density of wood= mass of wood/volume of wood

0.72= mass of wood/8*8*8
Mass of wood = 0.72*512 = 368.64g

Bookmark this page and keep refreshing for more updates as they unfold. Subscribe to our notifications and drop your email when prompted for fresh updates.

2021 WAEC Physics Objective Essay Question And Answer

WAEC Physics questions and answers

Objective answer

1-10: DACAACBBCC

11-20: BDBABBACAC

21-30: BCBACBBACA

31-40: BDDDDACCCA

41-50: AAAABBCBBC

Essay answers

(1)
Original length Lo= 3m
Extension e = 310 = 3*3= 9m

F×e
F=ke where k = 982.3NM-²
F=982.3*9=8,840.7N

The five that produce the extension F = 8.840.7N

(2a)
Flat metal plate are mainly used to collect heat for space heating in solar panels for heat transfer.

(2b)
Thermal insulator is used for reduction of heat transfer between objects in thermal contact

(2c)
tubes is a device that controls electric current flow in a high vacuum between electrodes to which an electric potential difference has been applied.

(3a)
highly purified silica glass.

(3b)
To confine the optical signal in the core the refractive index of the core must be greater than that of the cladding.

(5)
Escape velocity = VE
Radius of the earth = R

Acceleration due to gravity = 10ms²
Escape velocity Be=√2R

VE=√2*10R
VE=√20R

(6)
Angle at horizontal θ = 30°
Time of light , T = 25sec

Velocity of projection u = ?
But T=2using sinθ/g

25= 2u*sin30/10
25=0.5u/5

0.5u=125
U=125/0.5

=250ms-¹

(7)
(i)Coherence

(ii)Directionality
(iii)Monochromatic

(8ai)
A torque is defined as a measure of the force that can cause an object to rotate about an axis

WAEC Physics Questions 2021 and Answers
(8aii)

Factors that determine torque are;
– The magnitude of the force

– The radius
– The angle between the force and the lever arm

(8bi)
Free fall simply means the act of which are objects fall freely under the influence of gravitational force. An object under free fall does not encounter air resistance

(8bii)
Height of tower H = 40.0m
Velocity v = 10.0m/s, time t= ? , g=10.0m/s

Using the relation
S= ut + 1/2gt^2

H= ut + 1/2gt^2
40= 10t + 1/2*10t^2
4= t + t^2/2

= t^2 + 2t – 8=0 ( solving quadratically)
= (t+4)(t-2)=0

t+4=0 or t-2=0
t= -4 or t=2

Therefore time to fall on the ground t=2s

(8c)
R.d of oil =R1 = 0.72

R.d of water = R2=1.00

R.d of liquid= R1/R2= 0.72/1 = 0.72

R.d = density of wood(P1)/density of water(P2)
0.72=P1/1.00

P1= 0.72*1.00=0.72g/cm³
But density of wood= mass of wood/volume of wood

0.72= mass of wood/8*8*8
Mass of wood = 0.72*512 = 368.64g

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WAEC Physics Questions For Essay And Objective

Questions and answers.

PAPER 2 [Essay]
Read Instructions.
Write your answers on the answer booklet provided.

1. A particle is projected horizontally at 15ms-1 from a height of 20m.
Calculate the horizontal distance covered by the particle just before hitting the ground.
[g = 10 ms-2]

ANS: Let R represent the horizontal distance covered at time, t.
h = ½ gt2
20 = ½ x 10 x t2
t = 2s

R  = ut

=  15 x 2

= 30m

2. (a) tate Faraday’s second law of electrolysis.

(b) An electric charge of 9.6 x 104 C liberates 1 mole of substance containing 6.0 x 1023 atoms.  Determine the value of the electronic charge.

ANS: (a) If the same quantity of electricity is passed through different  voltameters/electrolytes connected in series the masses of the substances liberated/deposited during electrolysis is (directly) proportional to their chemical equivalents.

(b) Let e represent the electronic charge.

e  =   Faraday’s constant
Avogadro’s number

=          9.6 x 104
6. 0. x 1023

=  1.60 x 10-19C

3. State three methods of polarizing an unpolarized light.

4. (a) State Faraday’s second law of electrolysis.

(b) An electric charge of 9.6 x 104 C liberates 1 mole of substance containing 6.0 x 1023 atoms. Determine the value of the electronic charge.

ANS: (a) The mass of an element deposited /liberated during electrolysis is (directly) proportional to the chemical equivalent of the element.

(b) Let e represent the electronic charge.

e  =  Faraday’s constant
Avogadro’s number

=  9.6 x104
   6. 0. x 1023

=  1.60 x 10-19C

5. Explain the following terms:
(a) tensile stress;

(b) Young’s modulus.

6. (a) Define diffusion.
(b) State two applications of electrical conduction through gases.

ANS: (a) Diffusion is the process by which substances mix with one another due to the random motion of their molecules.

(b) Applications of electrical conduction through gases include:

– In advertising industry/ Neon signs
– In lighting/ fluorescent tubes

– Identification of gases
– Cathode ray oscilloscope/ T.V. tubes.

7. (a) List two properties of cathode rays.

(b) Explain how the intensity and energy of cathode rays may be increased.
ANS: (a) Properties of cathode rays:

– They are negatively charged.
– travel in straight line in field free space.

– are deflected by electric/magnetic field.
– possess (kinetic) energy.

– possess momentum.
(b) The intensity of cathode rays may be increased by raising the  temperature of the cathode /increasing the current through the heater.

They may be increased by raising the potential difference between the anode and the cathode/ the anode potential.

8. Give three observations in support of de Broglie’s assumption that moving particles behave like waves.

9. (a) Differentiate between plane polarization and interference as applied to waves.
(b) List two uses of polaroids.

ANS: (b) They are used in:
– production of 3-dimentional films

– determination of concentration of sugar solution
– polaroid cameras

– sun glasses.

10. (a) State two factors which affect the mass of elements deposited during electrolysis.
(b) List two non-electrolytes.

ANS: (a) time, current /quantity of charge, nature/ e.c.e of element.
(b) water, kerosene, petrol, benzene, ethanol.

11.

 

12. (a) i. State two advantages of alcohol over mercury as a thermometric liquid.

ii. When the bulb of a thermometer is placed in a beaker of hot water, the level of mercury first falls and then rises gradually. Explain this observation.

(b) List two factors, other than temperature, that affect the rate of evaporation of a liquid.

(c) A block of lead of mass 100kg in a crucible and at a temperature of 40oC was placed in an electric furnace rated 10kW. If the melting point of lead is 320oC, calculate the:

(i) quantity of heat required to heat the lead to its melting point;
(ii) additional heat energy required to melt the lead;

(iii) time taken to supply this additional energy.
(Specific heat capacity of lead = 120JKg-1 K-1

(Specific latent heat of fusion of lead = 2.5 x 104 JK-1)

(d) State two precautions necessary in an experiment to determine the specific latent heat of vaporization of water.

ANS: (a) i. Advantages of alcohol over mercury as a thermometric liquid
–  lower freezing point

–  cheaper
– easily expansively.

ii. the glass of the bulb of the thermometer first expands; hence the mercury level fails. The expansion of the mercury increases more than that of the glass and the liquid rises.

(b) Factors other than temperature affecting the rate of evaporation of a liquid
– wind
– humidity/ dryness of air

–  nature of liquid/ viscosity /density
– area of liquid exposed

–  pressure.

13. (a) State two factors which affect the angle of deviation of a ray of light through a triangular glass prism.

(b) Seven virtual images of an object are formed when two plane mirrors are inclined at an angle 0 to each other. Calculate the value of 0.

(c) By means of a ripple tank, a student was able to generate series of transverse waves by varying the frequency ofthe dipper and all the waves so generated covered a distance of 0.80 m in 0.2 s.

(i) Determine the speed, v, of the waves
(ii) Copy and complete the table given above in your answer booklet.

(iii) Plot a graph with f on the vertical axis and h -1 on the horizontal axis.
(iv) What does the slope of the graph represent?

14. The Fig. 5.1 below shows a ray of light entering and passing along an optical fibre.

 

(a) Calculate the refractive index of the glass in the optical fibre.

(b) Explain why the ray of light is totally internally reflected at A.

(c) Both optical fibre and copper wire are used to transmit data. Optical fibre is cheaper and can carry more data per second than copper wire.

State one other advantage of using optical fibre rather than copper wire to transmit data.

15. (a) State two differences between a sound wave and a radio wave

(b) Explain why a vibrating tuning fork sounds louder when its stem is pressed against a table top than when held in air.

(c) State two conditions necessary for the:
i. production of stationary wave in a medium;

ii. formation of interference wave patterns;

iii. occurrence of total internal reflection of a wave.

(d) i. A ray of light is incident on one face of an equilateral glass prism.Draw a ray diagram to show the path of the ray through the prism.

ii. Calculate the refractive index of the glass if the angle of minimum deviation is 41o.

Paper 1 [Objective]

Answer ALL questions in this section.

Shade your answers on the answer booklet provided.

1. An electron moves with a speed of 2.00 x 107 ms-1 in an orbit in a uniform magnetic field of 1.20 x 10-3T. Calculate the radius of the orbit.

[Mass of an electron = 9.11 x 10-31kg; charge on an electron = 1.61 x 10-19C]

2. A tennis ball projected at an angle attains a range R = 78 m. If the velocity imparted to the ball by the racket is 30ms-1, calculate.

[g=10ms-2]

3. A metallic bar 50 cm long has a uniform cross-sectional area of 4.0 cm2.  If a tensile force of 35kN produces an extension of 0.25 mm, calculate the value of Young’s modulus.

4. A stone projected horizontally from the top of a tower with a speed of 4 ms-1 lands on the level ground at a horizontal distance of 25 m from the foot of the tower. Calculate the height of the tower.
[g = 10 ms-2]

5. A spiral spring with a metal extends by 10.5cm in air. When the metal is fully in water, the spring extends by 6.8 cm. Calculate the relative density of the metal (Assume Hooke s law Is obeyed)

6. A ray of light is incident on an air-glass boundary at an angle t? If the angle between the partial reflected ray and the refracted ray is 90°, calculate θ given that the refractive index of glass is 1.50.

7. A ball is projected horizontally from a height with a velocity of 40 ms-1. Calculate the drop in height after travelling a horizontal distance of 30m.

[Neglect air resistance; g = 10 ms-1].

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WAEC 2021 Physics Essay Objection Question And Answer

1. A physical quantity that is independent of other quantities is known as….

A. Social Quantity
B. Derived Quantity
C. Fundamental Quantity
D. Vector Quantity
E. Physical Quantity

Click here for latest answers on 2021 WAEC Physics Essay and Objective 

ANSWER: A (Fundamental Quantity)

2. …….. units of the following physical quantities are derived? I. Area II. Thrust III. Pressure IV. Mass

A. I, II, III & IV
B. I, II, III only
C. I, II, IV only
D. I, & III only
E. I & IV only

ANSWER: B (I, II, III only)

3. Which of the following is not a Fundamental Quantity?

A. Speed
B. Mass
C. Time
D. Distance
E. None of the above

ANSWER: A (Speed)

4. The slope of a straight line displacement time graph gives…

A. Distance traveled
B. Uniform velocity
C. Uniform acceleration
D. Instantaneous acceleration
E. Uniform speed

ANSWER: B (Uniform velocity)

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5. A man will exact the greatest pressure on a bench when he

A. lies flat on his back
B. lies flat on his belly
C. stand on both feet
D. stand on one foot only
E. stand on toes of one foot

ANSWER: E (stand on toes of one foot)

6. When three coplanar and non-parallel forces are in equilibrium,
I. they can be represented in magnitude and direction by the three sides of a triangle taken in order.
II. their lines of action meet at a point.
III. the magnitude of anyone equals the magnitude of the resultant of the other two.
IV. any one force is the equilibrant of the other two.

Which of the following statements above are correct?

A. I & II only
B. II & III only
C. II, III & IV only
D. I, II, III & IV
E. I, III & IV only

ANSWER: D (I, II, III & IV)

7. Which of the following is not a derived quantity?

A. Speed
B. Acceleration
C. Mass
D. Velocity
E. Force

Answer: C ( Mass)

8. The type of energy possessed by a body by virtue of it position is known as…

A. Mechanical energy
B. Potential Energy
C. Kinetic Energy
D. Motition Energy
E Chemical Energy

Answer: B (potential energy)

9. Which of the following is not a property of wave?

A. Reflection
B. Diffraction
C. Refraction
D. Reaction
E. Polarization

Answer: D ( Reaction)

10. Calculate the velocity of a car covering a distance of 450m within 0.2 minutes.

A. 32m/s
B. 27.5m/s
C. 22m/s
D.37.5m/s
E. 40m/s

Answer: D (37.5m/s)

The following are Answers provided for the past WAEC Questions.

1)
Velocity of projection U_p =10m/s
T= sqr root 2h/g Where H=1
G=10
T=sqr root 2*1/10
=sqr root 0.2
=0.447s
V=UsinTita + gt V=10sin90 + 10*0.447
V=10 +4.45
V=14.5m/s

(2)
(i) The position of the ion of the atm of the element in the electrochemical(activity)series.
(ii) the nature of the electrode.
(iii) the concentration of the electrolyte

(7)
Doping of semiconductor increases the number of holes and electrons in the semiconductor,thereby making it impure whch makes it to be useful or active.

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…KEPCO KDN to identify opportunities to support nuclear power plant ICT and cyber security in the two countries, demonstrating UAE and Korean collaboration.

14th September, Abu Dhabi: The KEPCO Knowledge Data Network Co Ltd (KEPCO KDN), a world leader in ICT technology, opens its first branch in Abu Dhabi to facilitate knowledge exchange and new business development between Korea and the UAE.

Since its establishment in 1992, KEPCO KDN has been contributing to the development of the energy industry through ICT technology expertise and advancement, and is a leader in the Korean clean energy industry.

Jang Hyun Kim, CEO of KEPCO KDN, said, “Today marks an important day for us as we inaugurate our first branch in the UAE. KEPCO KDN has consolidated its position as a leader in its field, and will collaborate with local companies on ground-breaking projects such as the development of nuclear power plants ICT – a sector which lies at the heart of the electric power industry today.”

“We are looking forward to technology exchange and new business development in the areas of nuclear power plant ICT and cyber security as we initiate leading-edge projects within the UAE.”

The United Arab Emirates and Korea have maintained cooperative relations in the fields of economy, culture, and technology since 1970. In 2009, when UAE adopted nuclear power technology to fuel economic growth and invest in clean energy, it provided a new opportunity for cooperation between the two rapidly growing countries. Now KEPCO KDN is bringing its expertise in nuclear power plant ICT development and cyber security to the UAE.

In addition to this, KEPCO KDN (www.kdn.com) is at the forefront and developing various innovative AICBM technologies such as AI, IoT, Cloud, and Big Data. The company is also a leader in the field of future energy and is continuously investing in cutting-edge new technology. This includes AMI diffusion, electric car charging stations, energy big data service, E-prosumer, microgrid, energy storage devices, among several others.