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Question 12201Question →

A spatial analyst is calculating the total angular spans of Nigeria along both principal geographic axes to model its territorial dimensions. Based on Nigeria's absolute location, which of the following correctly pairs its longitudinal span (east-west) and latitudinal span (north-south) with the sovereign nation that forms its entire western boundary?

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Answer: Longitudinal span of 12∘12^\circ, latitudinal span of 10∘10^\circ, bounded to the west by the Republic of Benin

Answer

Longitudinal span of 12∘12^\circ, latitudinal span of 10∘10^\circ, bounded to the west by the Republic of Benin
Nigeria lies strictly between latitudes 4∘N4^\circ\text{N} and 14∘N14^\circ\text{N} and longitudes 3∘E3^\circ\text{E} and 15∘E15^\circ\text{E}. Taking the difference between these limits yields a longitudinal extent of 12∘12^\circ (15∘−3∘15^\circ - 3^\circ) and a latitudinal extent of 10∘10^\circ (14∘−4∘14^\circ - 4^\circ). Furthermore, Nigeria's western land frontier is shared exclusively with the Republic of Benin.

Step-by-Step Solution

1
Determine Nigeria's longitudinal span
Nigeria spans from 3∘E3^\circ\text{E} to 15∘E15^\circ\text{E}, giving an east-west difference of 15∘−3∘=12∘15^\circ - 3^\circ = 12^\circ.
Calculating longitudinal breadth requires subtracting the westernmost meridian from the easternmost meridian.
2
Determine Nigeria's latitudinal span
Nigeria spans from 4∘N4^\circ\text{N} to 14∘N14^\circ\text{N}, giving a north-south difference of 14∘−4∘=10∘14^\circ - 4^\circ = 10^\circ.
Calculating latitudinal length requires subtracting the southernmost parallel of latitude from the northernmost parallel.
3
Identify the western boundary country
The Republic of Benin borders Nigeria to the west.
Nigeria is bordered by Benin to the west, Niger to the north, Chad to the northeast, and Cameroon to the east.

Key Concept

Absolute Latitudinal and Longitudinal Extents and Neighboring Political Boundaries of Nigeria
Question 12202Question →

The interior physiography of Africa is dominated by a characteristic basin-and-swell structure, forming vast inland depressions such as the Congo, Chad, and Kalahari Basins separated by intervening high plateaus. Which of the following geological processes responsible for this broad landscape architecture contrasts it structurally from the East African Rift System?

Show answer & explanation

Answer: Widespread epeirogenic warping of the stable Precambrian crystalline shield, resulting in broad crustal sagging and gentle uplift rather than localized rift faulting.

Answer

Widespread epeirogenic warping of the stable Precambrian crystalline shield, resulting in broad crustal sagging and gentle uplift rather than localized rift faulting.
The interior relief of Africa is famously described as a 'basin and swell' topography. Because the continent is anchored by an ancient, stable crystalline shield, continental forces express primarily through epeirogenesis—slow, large-scale vertical crustal warping. Downwarping forms immense inland basins (such as the Congo, Chad, and Kalahari Basins), while upwarping creates intervening swells and plateaus. This structural flexing contrasts directly with localized tensional rifting seen in the East African Rift System.

Step-by-Step Solution

1
Analyze the structural landform characteristic of interior Africa.
Interior Africa consists of ancient, rigid Precambrian basement rock (cratons) forming a vast plateau landscape.
Understanding the geological foundation of the continent is essential to determining its dominant deformation mechanisms.
2
Distinguish between structural mechanisms: epeirogeny, orogeny, and rifting.
Epeirogenic movements cause slow, broad vertical uplift (swells) and subsidence (basins) over vast areas without intense folding or localized faulting. Rifting involves tensional fracturing, and orogeny involves compressional folding.
Comparing these tectonic processes clarifies why features like the Congo and Chad Basins differ structurally from mountain belts or fault rifts.
3
Identify the correct geological process forming Africa's basin-and-swell relief.
Epeirogenic warping of the continental shield created broad internal drainage basins (e.g., Congo, Chad, Kalahari) surrounded by raised swells (e.g., Bié Plateau, Jos Plateau).
This tectonic flexure directly accounts for the unique macro-relief profile of interior Africa.

Key Concept

Basin and Swell Structure of Africa via Epeirogenic Warping
Question 12203Question →

An agricultural district in West Africa experiences severe land degradation, compelling a significant portion of its economically active population to relocate. Prior to migration, the district recorded 40,00040,000 children (aged 0–14), 10,00010,000 elderly citizens (aged 65+), and 100,000100,000 working-age adults (aged 15–64). If out-migration permanently reduces the working-age population by 50%50\% while the non-working dependent population remains unchanged, which of the following correctly evaluates the demographic impact on the sending region's dependency ratio and classifies the primary migration driver originating at the rural source?

Show answer & explanation

Answer: The demographic dependency ratio doubles from 50%50\% to 100%100\%, driven by an environmental push factor at the origin.

Answer

The demographic dependency ratio doubles from 50%50\% to 100%100\%, driven by an environmental push factor at the origin.
The baseline dependency ratio is calculated as (Children+ElderlyWorking-Age)×100=(50,000100,000)×100=50%\left( \frac{\text{Children} + \text{Elderly}}{\text{Working-Age}} \right) \times 100 = \left( \frac{50,000}{100,000} \right) \times 100 = 50\%. Following the 50%50\% out-migration of working-age adults, the workforce drops to 50,00050,000, raising the dependency ratio to (50,00050,000)×100=100%\left( \frac{50,000}{50,000} \right) \times 100 = 100\%. Additionally, land degradation is a negative environmental condition at the source region, rendering it a classic push factor.

Step-by-Step Solution

1
Calculate the initial dependent population and baseline dependency ratio.
Total initial dependents = 40,000+10,000=50,00040,000 + 10,000 = 50,000. Baseline Dependency Ratio = (50,000100,000)×100=50%\left( \frac{50,000}{100,000} \right) \times 100 = 50\%.
Dependency ratio measures the ratio of non-working dependents (aged 0–14 and 65+) per 100 working-age people (aged 15–64).
2
Calculate the new working-age population after out-migration and compute the updated dependency ratio.
New working-age population = 100,000×(1−0.50)=50,000100,000 \times (1 - 0.50) = 50,000. New Dependency Ratio = (50,00050,000)×100=100%\left( \frac{50,000}{50,000} \right) \times 100 = 100\%.
Out-migration reduced the denominator (workforce) by half while leaving the numerator (dependents) constant.
3
Identify the nature of the migration driver originating at the rural area.
Severe land degradation at the place of origin is an unfavorable condition forcing people away, which is an environmental push factor.
Push factors are negative conditions at the place of origin that compel individuals to move away.

Key Concept

Demographic Dependency Ratio and Push-Pull Migration Factors
Estimated Time:2m 0s
Question 12204Question →

On 1 January 2025, the Bank account in the ledger of Alaba Traders had an opening credit balance (overdraft) of ₦45,000₦45,000. During January, the following summary transactions were recorded:

- Cash deposited into the bank: ₦260,000₦260,000
- Direct transfer received from a trade customer: ₦85,000₦85,000
- Cheques issued to trade suppliers: ₦190,000₦190,000
- Bank charges debited by the bank: ₦12,000₦12,000
- Customer's cheque dishonoured and returned by bank: ₦25,000₦25,000

What is the balance carried down (c/d) of the Bank account as at 31 January 2025?

Show answer & explanation

Answer: ₦73,000₦73,000 Debit

Answer

The correct balance carried down (c/d) of the Bank account at 31 January 2025 is ₦73,000₦73,000 Debit.
To balance the bank ledger account, entries are classified by double-entry principles. The debit side records increases (cash deposit of ₦260,000₦260,000 and direct transfer of ₦85,000₦85,000, total ₦345,000₦345,000). The credit side records decreases and opening liabilities (overdraft b/d of ₦45,000₦45,000, cheques issued of ₦190,000₦190,000, bank charges of ₦12,000₦12,000, and customer dishonoured cheque of ₦25,000₦25,000, total ₦272,000₦272,000). The difference gives a net debit balance carried down (c/d) of ₦73,000₦73,000.

Step-by-Step Solution

1
Identify and sum all Debit side entries (receipts/increases to bank)
Total Debits = Cash deposited (₦260,000₦260,000) + Direct transfer (₦85,000₦85,000) = ₦345,000₦345,000
Bank account is an asset account; increases in bank funds are posted to the debit side.
2
Identify and sum all Credit side entries (overdraft/payments/reductions)
Total Credits = Opening Overdraft b/d (₦45,000₦45,000) + Cheques issued (₦190,000₦190,000) + Bank charges (₦12,000₦12,000) + Dishonoured cheque (₦25,000₦25,000) = ₦272,000₦272,000
Opening bank overdraft, payments, and dishonoured customer cheques decrease bank balance and are posted to the credit side.
3
Calculate the balance carried down (c/d)
Balance c/d = Total Debits (₦345,000₦345,000) - Total Credits (₦272,000₦272,000) = ₦73,000₦73,000 (Debit balance)
The excess of total debits over total credits represents a positive cash at bank balance to be extracted to the debit column of the Trial Balance.

Key Concept

Balancing T-accounts and determining the nature of bank account balances (debit asset vs credit overdraft)
Question 12205Question →

In population geography, various social, economic, and environmental conditions influence the movement of individuals from rural settlements to urban centers. Which of the following represents a push factor that drives rural-to-urban migration?

Show answer & explanation

Answer: Lack of gainful employment opportunities and poor social infrastructure in rural villages

Answer

Lack of gainful employment opportunities and poor social infrastructure in rural villages
The correct answer identifies negative conditions existing at the point of origin—specifically rural unemployment and inadequate infrastructure. In population migration, push factors are disadvantages of an origin area that motivate residents to move away.

Step-by-Step Solution

1
Define the geographical concept of a migration push factor.
A push factor is an unfavorable condition at a migrant's origin that forces or encourages them to relocate.
Distinguishing between push factors (negative origin aspects) and pull factors (positive destination attractions) is essential in population geography.
2
Evaluate the given choices against the definition.
Inadequate employment and poor infrastructure in rural villages represent negative origin conditions, correctly identifying a push factor.
Attractions at the city draw people in (pull factors), whereas hardships in villages force people out (push factors).

Key Concept

Push and Pull Factors of Migration
Estimated Time:45s
Question 12206Question →

Two weather observation stations, Station A and Station B, record simultaneous solar observations. Station A is located at longitude 12∘W12^\circ\text{W} where the local solar time is 02:00 PM02:00\text{ PM}. At the exact same moment, the local solar time at Station B is 07:00 PM07:00\text{ PM}. What is the longitude of Station B in degrees East (∘E^\circ\text{E})?

Show answer & explanation

Answer: 63

Answer

The longitude of Station B is 63∘E63^\circ\text{E}.
The local time difference between Station A (02:00 PM02:00\text{ PM}) and Station B (07:00 PM07:00\text{ PM}) is 5 hours5\text{ hours}. Since 1 hour1\text{ hour} equals 15∘15^\circ of longitude, a 5-hour5\text{-hour} difference equals 75∘75^\circ of angular distance (5×15∘5 \times 15^\circ). Station B's local time is ahead of Station A, indicating that Station B is located further East. Starting from 12∘W12^\circ\text{W} and moving 75∘75^\circ East, 12∘12^\circ is required to reach 0∘0^\circ (the Prime Meridian), leaving 63∘63^\circ into the Eastern Hemisphere. Therefore, Station B is located at 63∘E63^\circ\text{E}.

Step-by-Step Solution

1
Calculate the time difference between Station A and Station B.
Station B (19:0019:00) is 5 hours5\text{ hours} ahead of Station A (14:0014:00).
Comparing local solar times gives the time separation between the two longitudes.
2
Convert the time difference into angular distance in degrees.
5 hours×15∘/hour=75∘5\text{ hours} \times 15^\circ/\text{hour} = 75^\circ angular distance.
The Earth rotates 360∘360^\circ in 24 hours, which corresponds to 15∘15^\circ of longitude per hour.
3
Determine the longitude of Station B from Station A across the Prime Meridian.
75∘ East−12∘W=63∘E75^\circ\text{ East} - 12^\circ\text{W} = 63^\circ\text{E}.
Station B is later in solar time, so it lies East of Station A. Moving East from 12∘W12^\circ\text{W} uses 12∘12^\circ to reach 0∘0^\circ (Prime Meridian) and the remaining 63∘63^\circ enters the Eastern Hemisphere.

Key Concept

Calculating longitude from local time difference across meridians
Estimated Time:1m 30s
Question 12207Question →

Two meteorological stations are situated along different meridians. Station Alpha is positioned at longitude 38∘W38^\circ\text{W}, while Station Beta is positioned at longitude 82∘E82^\circ\text{E}. What is the difference in local solar time between these two stations, in hours?

Show answer & explanation

Answer: 8

Answer

The difference in local solar time between the two stations is 8 hours.
Station Alpha is located in the Western Hemisphere (38∘W38^\circ\text{W}) and Station Beta is located in the Eastern Hemisphere (82∘E82^\circ\text{E}). The total angular distance separating them across the Greenwich Meridian is 38∘+82∘=120∘38^\circ + 82^\circ = 120^\circ. Dividing 120∘120^\circ by the Earth's rotation speed of 15∘15^\circ per hour gives a time difference of 8 hours.

Step-by-Step Solution

1
Calculate the total longitudinal angular distance between 38∘W38^\circ\text{W} and 82∘E82^\circ\text{E}.
Angular distance = 38∘+82∘=120∘38^\circ + 82^\circ = 120^\circ.
Because the two locations lie in opposite hemispheres relative to the Prime Meridian (0∘0^\circ), their longitudinal degree values must be added together.
2
Convert the total angular distance to time difference in hours.
Time difference = 120∘÷15∘/hour=8 hours120^\circ \div 15^\circ\text{/hour} = 8\text{ hours}.
The Earth completes a 360∘360^\circ rotation in 24 hours, which corresponds to 15∘15^\circ per hour.

Key Concept

Calculation of longitudinal difference across the Prime Meridian and conversion to local solar time difference.
Question 12208Question →

Despite possessing moderate annual rainfall and a central location within Nigeria, the Middle Belt historically displayed a much lower population density than both the northern Sudan savanna and the southern forest zone. Which of the following combinations of factors best accounts for this historical anomaly in population distribution?

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Answer: Historical slave depopulation, endemic tsetse fly infestation, and thin, heavily leached soils

Answer

Historical slave depopulation, endemic tsetse fly infestation, and thin, heavily leached soils
The low population density of the Middle Belt of Nigeria (often referred to as the 'middle belt sparse zone') is historically rooted in a combination of environmental and historical factors. Slave raids during the 18th and 19th centuries heavily depopulated the region. Additionally, the wooded savanna environment favored tsetse flies, which transmitted trypanosomiasis (sleeping sickness) to humans and livestock, limiting pastoralism and settlement. Poor, heavily leached lateritic soils further constrained intensive agriculture compared to the rich volcanic soils of the Jos Plateau or the alluvial soils of major river valleys.

Step-by-Step Solution

1
Analyze the spatial anomaly in population density presented in the stem.
Identified that the Middle Belt of Nigeria has lower population density relative to its surrounding ecological zones despite moderate rainfall and central positioning.
Resolving population distribution questions requires comparing physical, historical, and socio-economic influences across regions.
2
Evaluate the physical and historical constraints operating specifically within the Middle Belt zone.
Determined that 19th-century slave raids (from northern emirates and southern kingdoms) caused widespread depopulation, while dense woodland vegetation harbored tsetse flies (causing human and animal trypanosomiasis) and soils suffered severe leaching.
Physical factors (vectors, soil quality) and historical factors (slave raiding) combined to suppress human carrying capacity.
3
Distinguish the true causative controls from demographic and settlement pattern misconceptions.
Confirmed that historical depopulation, vector disease, and low soil fertility provide the comprehensive explanation for the region's sparse population density.
Excludes options that attribute low density to modern economic pull factors, inverted dependency ratios, or settlement nucleation.

Key Concept

Physical, Historical, and Ecological Controls on Regional Population Density
Question 12209Question →

Severe drought and soil degradation in a rural farming community compel young inhabitants to relocate to urban areas in search of non-agricultural employment. Which type of migration factor is primarily responsible for forcing these individuals to leave their place of origin?

Show answer & explanation

Answer: A push factor arising from environmental and economic hardship at the origin

Answer

A push factor arising from environmental and economic hardship at the origin
The correct answer correctly identifies negative environmental and economic pressures at the source community as push factors. Drought and land degradation force individuals out of rural areas because their traditional livelihoods are no longer viable.

Step-by-Step Solution

1
Analyze the conditions described in the scenario
Identified negative origin conditions: severe drought, soil degradation, and lack of agricultural employment.
Migration causes are categorized based on whether they originate at the source location or the destination location.
2
Classify the migration driver using population geography concepts
Negative conditions at the origin that drive people away are classified as push factors.
Push factors push individuals out of their homeland, whereas pull factors pull them toward a new destination.

Key Concept

Push and Pull Factors of Population Migration
Question 12210Question →

During a field study examining Earth's external structure and surface processes, students observed solid bedrock disintegrating in situ into loose debris without immediate displacement. Which sphere of the Earth is primarily affected by this process, and how is this process correctly distinguished from mass wasting?

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Answer: Lithosphere; the process is weathering which occurs in situ, while mass wasting involves the gravity-driven downslope movement of rock material.

Answer

Lithosphere; the process is weathering which occurs in situ, while mass wasting involves the gravity-driven downslope movement of rock material.
The correct response identifies the lithosphere as the solid outer sphere where bedrock breaks down. It accurately states that weathering is an in situ process (disintegration on site without transportation), whereas mass wasting involves the movement of weathered material downslope under the direct influence of gravity.

Step-by-Step Solution

1
Identify the Earth sphere containing solid bedrock and surface landforms.
The solid outer shell of the Earth is the lithosphere.
The lithosphere comprises the Earth's crust and uppermost solid mantle where surface geological processes occur.
2
Analyze the observed physical process of in situ rock breakdown.
In situ disintegration without transportation is defined as weathering.
Weathering breaks down rock at its original position through physical, chemical, or biological agents.
3
Differentiate weathering from mass wasting.
Mass wasting specifically requires downslope displacement driven by gravity, whereas weathering does not involve material movement.
A clear distinction between static breakdown (weathering) and gravity-driven transport (mass wasting) is fundamental in physical geography.

Key Concept

Distinction between weathering and mass wasting within Earth's lithosphere
Question 12211Question →

Which of the following major African landforms is an extensive high plateau formed primarily by basaltic volcanic activity?

Show answer & explanation

Answer: The Ethiopian Highlands

Answer

The Ethiopian Highlands
The Ethiopian Highlands were created by extensive fissure eruptions of basaltic lava during the Tertiary period, producing a vast, elevated volcanic plateau often called the 'Roof of Africa'.

Step-by-Step Solution

1
Analyze the landform description provided in the question stem.
The target landform must be an elevated plateau of volcanic origin.
The question specifies both the physical structure (high plateau) and the formation mechanism (volcanic activity).
2
Evaluate the relief features of Africa against this geological origin.
The Ethiopian Highlands were formed by massive flood basalt lava outpourings associated with rift system development.
This physical region is widely recognized as Africa's largest continuous high-altitude volcanic plateau structure.

Key Concept

Relief and Major Landforms of Africa - Volcanic Plateaus
Question 12212Question →

On a regional conservation map drawn to a Representative Fraction (R.F.) scale of 1:25,0001 : 25,000, the distance between two forest ranger posts along a straight trail measures 16.4 cm16.4\text{ cm}. What is the actual ground distance between the two ranger posts in kilometers?

Show answer & explanation

Answer: 4.1

Answer

The actual ground distance between the two ranger posts is 4.1 kilometers.
The scale ratio 1 : 25,000 indicates that 1 centimeter on the map corresponds to 25,000 centimeters (or 0.25 kilometers) on the ground. Multiplying the measured map length of 16.4 centimeters by 0.25 kilometers per centimeter gives an actual ground distance of 4.1 kilometers.

Step-by-Step Solution

1
Determine ground distance in centimeters
16.4 cm×25,000=410,000 cm16.4\text{ cm} \times 25,000 = 410,000\text{ cm}
Each unit on the map represents 25,000 identical units on the ground.
2
Convert centimeters to meters
410,000 cm÷100=4,100 m410,000\text{ cm} \div 100 = 4,100\text{ m}
There are 100 centimeters in 1 meter.
3
Convert meters to kilometers
4,100 m÷1,000=4.1 km4,100\text{ m} \div 1,000 = 4.1\text{ km}
There are 1,000 meters in 1 kilometer.

Key Concept

Ground distance calculation using Representative Fraction (R.F.) map scale
Question 12213Question →

In the Niger Delta region of Nigeria, crude oil deposits were formed from ancient organic matter over millions of years, while mangrove forests yield timber used for fuelwood and construction. Which of the following statements correctly distinguishes between these two natural resources based on their sustainability and replenishment timescales?

Show answer & explanation

Answer: Crude oil is a non-renewable resource because its rate of geological formation is vastly slower than human consumption, whereas mangrove timber is renewable as it can regenerate within human timeframes.

Answer

Crude oil is a non-renewable resource because its geological formation requires millions of years, making extraction faster than natural replenishment, while mangrove timber is renewable because biological growth permits natural regeneration within human timeframes.
Natural resources are categorized by their capacity for natural regeneration within human operational timeframes. Crude oil is non-renewable because its geological formation requires millions of years, rendering its reserves finite and exhaustible. Mangrove timber is a biological resource that naturally regenerates within years or decades, making it renewable under sustainable management.

Step-by-Step Solution

1
Identify the defining criteria for resource classification.
Resources are categorized as renewable or non-renewable based on their rate of natural replenishment relative to human consumption rates.
Replenishment timescale determines whether a resource can be naturally replaced as fast as it is used.
2
Analyze the formation timescale of crude oil.
Crude oil takes millions of years of subterranean heat and pressure to form from organic sediments.
Since human consumption consumes crude oil at a rate millions of times faster than its formation, it is non-renewable.
3
Analyze the regeneration cycle of mangrove timber.
Mangrove trees reproduce and grow to maturity over decades.
Because biological reproduction occurs within human lifespans, living forest resources are naturally renewable under sustainable harvest practices.

Key Concept

Classification of renewable vs non-renewable natural resources based on regeneration timescales
Question 12214Question →

A cartographer is marking the longitudinal coordinates of Nigeria on a political map of West Africa. Between which meridians of longitude is Nigeria situated?

Show answer & explanation

Answer: 3∘E3^\circ\text{E} and 15∘E15^\circ\text{E}

Answer

Nigeria is situated between meridians of longitude 3∘E3^\circ\text{E} and 15∘E15^\circ\text{E}.
Nigeria lies entirely in the Eastern Hemisphere, stretching east-west between longitude 3∘E3^\circ\text{E} and longitude 15∘E15^\circ\text{E}, giving it a total longitudinal span of 12∘12^\circ.

Step-by-Step Solution

1
Identify the geographical coordinates representing East-West extent
Longitudinal lines measure angular distance east or west of the Prime Meridian (0∘0^\circ).
The question specifically asks for meridians of longitude.
2
Recall Nigeria's longitudinal boundary limits
Nigeria extends from 3∘E3^\circ\text{E} at its westernmost border with Benin Republic to 15∘E15^\circ\text{E} at its easternmost border around Lake Chad.
These coordinates define the country's full longitudinal span of 12∘12^\circ.

Key Concept

Absolute Location and Boundaries of Nigeria
Question 12215Question →

In the financial records of Folake Commercial Stores for the year ended 31st December 2025, the Trade Debtors balance stood at ₦400,000\text{₦}400,000. Additional information reveals that bad debts of ₦20,000\text{₦}20,000 are to be written off, a provision for doubtful debts is to be created at 5%5\% of net debtors, and a provision for discount on debtors is to be allowed at 2%2\%.

Based on the adjustments above, complete the financial statement summary by filling in the missing figures.

Fill in the blanks below

The provision for discount on debtors created for the year is ₦\text{₦}, and the final net Trade Debtors balance presented in the Balance Sheet is ₦\text{₦}.
Show answer & explanation

Answer

The provision for discount on debtors created for the year is ₦7,220, and the net Trade Debtors balance presented in the Balance Sheet is ₦353,780.
Accounting rules require a strict sequential treatment for adjustments to trade debtors: first write off bad debts, second calculate and deduct the provision for doubtful debts, and third calculate the provision for discount on debtors on the remaining balance. Subtracting bad debts (₦20,000\text{₦}20,000) from gross debtors (₦400,000\text{₦}400,000) gives ₦380,000\text{₦}380,000. Deducting a 5%5\% provision for doubtful debts (₦19,000\text{₦}19,000) leaves ₦361,000\text{₦}361,000. Applying the 2%2\% discount rate to ₦361,000\text{₦}361,000 gives ₦7,220\text{₦}7,220 for the provision for discount on debtors. Finally, deducting ₦7,220\text{₦}7,220 from ₦361,000\text{₦}361,000 results in a net Trade Debtors balance of ₦353,780\text{₦}353,780 in the Balance Sheet.

Step-by-Step Solution

1
Deduct bad debts written off from gross debtors to obtain adjusted debtors
₦400,000−₦20,000=₦380,000\text{₦}400,000 - \text{₦}20,000 = \text{₦}380,000
Bad debts are irrecoverable debts and must be written off from gross debtors before calculating any provisions.
2
Calculate the provision for doubtful debts
5%×₦380,000=₦19,0005\% \times \text{₦}380,000 = \text{₦}19,000
The provision for doubtful debts is computed on the net debtors remaining after deducting bad debts.
3
Determine the remaining debtors base eligible for prompt payment discount
₦380,000−₦19,000=₦361,000\text{₦}380,000 - \text{₦}19,000 = \text{₦}361,000
Cash discount will only be expected from debtors who are expected to pay (excluding bad and doubtful debtors).
4
Compute the provision for discount on debtors
2%×₦361,000=₦7,2202\% \times \text{₦}361,000 = \text{₦}7,220
The provision for discount rate (2%2\%) is applied to the net estimated collectible debtors (₦361,000\text{₦}361,000).
5
Calculate the final net Trade Debtors figure for the Balance Sheet
₦361,000−₦7,220=₦353,780\text{₦}361,000 - \text{₦}7,220 = \text{₦}353,780
Both provisions are subtracted from the adjusted debtors to reflect the realistic cash expected to be realized.

Key Concept

Sequential Order of Adjustments to Debtors
Question 12216Question →

A borehole core retrieved during mineral exploration in a complex geological terrain reveals a dense, non-foliated rock composed predominantly of coarse, recrystallized calcite crystals exhibiting an interlocking mosaic texture. If this formation originated from the thermal contact metamorphism of a carbonate sedimentary parent rock adjacent to an igneous intrusion, which of the following correctly identifies the resulting metamorphic rock and its major industrial utility?

Show answer & explanation

Answer: Marble, utilized extensively as dimensional building stone and as a raw material in cement manufacture

Answer

Marble, utilized extensively as dimensional building stone and as a raw material in cement manufacture
The correct option identifies marble as the product of thermal (contact) metamorphism acting upon carbonate sedimentary rocks such as limestone. Thermal contact metamorphism subjects the surrounding rock to intense heat from magma without directional pressure, turning fine-grained calcite into a dense, non-foliated matrix of recrystallized calcite. Economically, marble is widely quarried for high-grade architectural dimension stone, decorative monuments, and as crushed lime for cement production.

Step-by-Step Solution

1
Analyze the mineral composition and structural texture given in the scenario
The core sample contains recrystallized calcite with a non-foliated interlocking texture.
Calcite (CaCO3CaCO_3) is the diagnostic constituent mineral of carbonate rocks.
2
Identify the parent rock and metamorphic process
Thermal contact metamorphism of limestone/dolomite yields Marble.
Heat from igneous intrusions recrystallizes fine calcite shells/grains into coarse interlocking crystals without directed stress.
3
Evaluate the economic significance of the identified rock
Marble is mined for high-value building facades, monuments, and crushed industrial calcium carbonate.
Its aesthetic polish and chemical purity make it economically crucial in construction and chemical industries.

Key Concept

Metamorphic Protoliths, Thermal Transformation Processes, and Economic Mineral Uses
Question 12217Question →

A geographic research team is tracing political divisions across Southern Africa along the Tropic of Capricorn (23.5∘S23.5^\circ\text{S}) from the Atlantic coast eastward to the Indian Ocean. Which of the following lists represents the correct sequence of sovereign nations intersected by this line of latitude in order from west to east?

Show answer & explanation

Answer: Namibia, Botswana, South Africa, Mozambique, and Madagascar

Answer

The correct sequence of sovereign nations intersected by the Tropic of Capricorn (23.5∘S23.5^\circ\text{S}) from west to east is Namibia, Botswana, South Africa, Mozambique, and Madagascar.
The Tropic of Capricorn (23.5∘S23.5^\circ\text{S}) enters the African continent at Namibia's Atlantic coastline, travels eastward through central Botswana, passes through the northern region (Limpopo Province) of South Africa, continues across southern Mozambique, and crosses the Indian Ocean to cut through southern Madagascar. This yields the exact sequential order: Namibia, Botswana, South Africa, Mozambique, and Madagascar.

Step-by-Step Solution

1
Identify the latitude line and starting boundary
The Tropic of Capricorn is located at approximately 23.5∘S23.5^\circ\text{S} latitude and enters western Africa at the Atlantic Ocean coast.
Establishing the precise geographic coordinates defines the spatial corridor being analyzed.
2
Trace the latitude line eastward across mainland Southern Africa
The parallel 23.5∘S23.5^\circ\text{S} enters Namibia on the Atlantic coast, moves east through central Botswana, cuts across the northern Limpopo province of South Africa, and traverses southern Mozambique to reach the Indian Ocean.
Spatial evaluation of political boundaries confirms which mainland countries are traversed by 23.5∘S23.5^\circ\text{S} latitude.
3
Account for island nations in the Indian Ocean section
Crossing the Mozambique Channel, 23.5∘S23.5^\circ\text{S} intersects the southern region of the island nation of Madagascar.
Political divisions of Africa include offshore island states crossed by major lines of latitude.

Key Concept

Latitudinal Location and Political Boundaries of Southern Africa
Estimated Time:2m 0s
Question 12218Question →

Match each Earth structural component or seismic boundary in Column I with its defining composition or physical behavior in Column II.

Click a left item, then click its matching right item

Items

Conrad Discontinuity
Asthenosphere
Internal Mesosphere
Gutenberg Discontinuity

Matches

Show answer & explanation

Answer

Conrad Discontinuity matches with the seismic boundary separating the upper granitic continental layer from the lower basaltic layer; Asthenosphere matches with the ductile, low-velocity mantle zone whose partial melting allows plastic deformation and lithospheric motion; Internal Mesosphere matches with the rigid, solid lower mantle region extending from the base of the asthenosphere to the outer core threshold; Gutenberg Discontinuity matches with the core-mantle boundary characterized by a sharp drop in compressional wave speed and complete cessation of shear waves.
The Conrad Discontinuity separates the granitic upper crust from the basaltic lower crust. The Asthenosphere is the partially molten upper mantle layer allowing tectonic flow. The Internal Mesosphere is the solid lower mantle. The Gutenberg Discontinuity marks the mantle-outer core interface where shear waves cannot propagate.

Step-by-Step Solution

1
Analyze intra-crustal and deep interior seismic discontinuities.
The Conrad boundary lies within continental crust between granitic sial and basaltic sima, while the Gutenberg boundary separates the rocky mantle from the liquid outer core where S-waves terminate.
Seismic discontinuities mark physical state transitions and compositional variations within the Earth.
2
Differentiate mechanical states across the mantle zones.
The upper mantle contains the ductile asthenosphere enabling lithospheric motion, whereas the lower mantle (internal mesosphere) remains solid despite elevated temperatures due to immense lithostatic pressure.
The physical state of Earth layers is dictated by the equilibrium between geothermal heat and confining pressure.
3
Pair each listed structural component with its precise geophysical characteristics.
Each Column I item accurately pairs with its corresponding Column II description.
Accurate pairing demonstrates advanced knowledge of Earth's internal division and seismic boundaries.

Key Concept

Internal Structure of the Earth and Seismic Discontinuities
Question 12219Question →

Pair each of the following natural resources with its corresponding sustainability classification and replenishment characteristic.

Click a left item, then click its matching right item

Items

Solar Radiation
Crude Oil
Rainforest Timber
Iron Ore

Matches

Show answer & explanation

Answer

Solar Radiation pairs with continuous inexhaustible flow resource; Crude Oil pairs with non-renewable organic energy resource; Rainforest Timber pairs with renewable biological stock resource; Iron Ore pairs with non-renewable metallic mineral resource.
Solar radiation is a continuous inexhaustible flow resource. Crude oil is a finite fossil fuel created over millions of years (non-renewable). Rainforest timber is living biomass capable of self-replenishment under sound conservation practices (renewable). Iron ore is a inorganic mineral deposit present in fixed global reserves (non-renewable).

Step-by-Step Solution

1
Analyze each resource based on its natural formation time and rate of natural replenishment relative to human consumption.
Solar radiation is perpetual. Timber grows back biologically. Crude oil and iron ore exist in static geological quantities.
Natural resources are broadly grouped into renewable resources (replenished rapidly by biological or physical processes) and non-renewable resources (formed over geological timescales in fixed amounts).
2
Match each resource on the left to its specific characteristic description on the right.
Solar radiation matches continuous flow resource; crude oil matches non-renewable organic energy; rainforest timber matches renewable biological stock; iron ore matches non-renewable metallic mineral.
Accurate pairing distinguishes between inexhaustible flow energy, living renewable stocks, finite fossil fuels, and finite mineral ores.

Key Concept

Classification of Natural Resources into Renewable (Flow/Biological) and Non-Renewable (Fossil/Mineral)
Question 12220Question →

Which climatic zone in Africa is characterized by consistently high temperatures throughout the year and a bimodal (double peak) annual rainfall distribution?

Show answer & explanation

Answer: Tropical Equatorial Climate

Answer

Tropical Equatorial Climate
The Tropical Equatorial Climate zone in Africa, situated around the Equator in regions like the Congo Basin and coastal Gulf of Guinea, experiences high annual temperatures with minimal seasonal variation. Because the sun passes directly overhead twice a year during the equinoxes, atmospheric heating generates intense convective rainstorms resulting in two distinct precipitation peaks (a bimodal rainfall regime).

Step-by-Step Solution

1
Identify the key temperature and precipitation characteristics described in the stem.
The stem specifies constant high temperatures and two annual rainfall peaks (bimodal distribution).
Regions along the Equator receive direct overhead solar radiation twice a year during the equinoxes, triggering intense convective precipitation.
2
Match these characteristics to the corresponding African climate zone.
The Equatorial climate zone (found in the Congo Basin and coastal West Africa) uniquely exhibits this bimodal rainfall regime.
As the Inter-Tropical Convergence Zone (ITCZ) passes over the equatorial belt twice each year, it brings two periods of maximum rainfall.

Key Concept

Bimodal rainfall regime of the African Tropical Equatorial Climate
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