All practice questions

13931 questions

All types13,931 Multiple choice7,139 True / False771 Numeric1,526 Matching2,583 Ordering631 Fill in the blank1,223 Short answer58

Question 13761Question →

A geologist examines a dense, crystalline rock specimen composed of recrystallized calcite grains formed when pre-existing limestone was subjected to high temperatures from a nearby magmatic intrusion. Which geological process formed this rock, and what is its major economic application?

Thermal metamorphism forming marble, which is widely utilized as a decorative architectural and sculpting stone.

Chemical weathering forming chalk, which is extracted primarily for agricultural lime production.

Mass movement down a slope forming scree, which is harvested for railway ballast construction.

Rapid extrusive cooling forming basalt, which is crushed for road construction aggregates.

Show answer & explanation

Answer: Thermal metamorphism forming marble, which is widely utilized as a decorative architectural and sculpting stone.

Answer

Thermal metamorphism forming marble, which is widely utilized as a decorative architectural and sculpting stone.

When limestone is subjected to severe heat from nearby magma, thermal (contact) metamorphism occurs, causing calcite crystals to grow and interlock into dense marble. Economically, marble is prized for decorative building facades, flooring, and sculpture.

Step-by-Step Solution

Identify the parent rock and geological environment described.

Limestone (calcite-rich) exposed to intense heat from nearby magma bodies undergoes thermal (contact) metamorphism.

Magmatic heat drives mineral recrystallization without strong directional pressure.

Determine the resulting metamorphic rock type.

Recrystallization of calcite minerals converts limestone into non-foliated marble.

Calcite grains interlocking during thermal alteration create marble's characteristic compact texture.

Identify the primary economic importance of the resulting rock.

Marble takes a high polish and possesses great aesthetic value, making it ideal for monument sculpting and decorative building facades.

Physical strength, polishability, and visual appeal drive commercial quarrying for construction and art.

Key Concept

Thermal metamorphism of limestone to marble and its economic applications

Estimated Time:1m 15s

Question 13762Question →

An enterprise operating in Ondo State carries out four main operational activities: logging timber from a natural forest, processing timber logs into plywood sheets, transporting plywood to regional wholesalers, and providing personal hair-styling services to company executives. Which of these activities is correctly categorized as a direct service occupation?

Logging timber from a natural forest

Processing timber logs into plywood sheets

Providing personal hair-styling services to company executives

Transporting plywood sheets to regional wholesalers

Show answer & explanation

Answer: Providing personal hair-styling services to company executives

Answer

Providing personal hair-styling services to company executives is classified as a direct service occupation.

Providing personal hair-styling services is a direct service occupation because it is rendered directly to individuals to satisfy personal non-commercial needs, paid for directly by the recipient.

Step-by-Step Solution

Identify the main sectors of occupation present in the scenario.

The scenario includes primary extractive work (logging timber), secondary manufacturing (plywood processing), commercial tertiary service (transporting goods), and direct tertiary service (personal hair-styling).

Occupations are broadly divided into primary, secondary, and tertiary sectors, with the tertiary sector further split into commercial services and direct services.

Differentiate between commercial services and direct services within the tertiary sector.

Commercial services facilitate trade (e.g., transport, warehousing, banking), while direct services involve personal, non-commercial care or assistance rendered directly to consumers (e.g., hair-styling, private tutoring, domestic help).

Direct services satisfy personal needs directly and are paid for by the individual consumer receiving the service.

Select the activity that meets the definition of a direct service.

Providing personal hair-styling services directly satisfies a personal consumer need, making it a direct service occupation.

Unlike transport, which aids trade, hair-styling is a personal service rendered directly to an individual.

Key Concept

Classification of Tertiary Occupations: Direct Services vs. Commercial Services

Question 13763Question →

Under the National Environmental Standards and Regulations Enforcement Agency (NESREA) Act of 2007, the agency is legally mandated to enforce compliance with international environmental treaties, conventions, and protocols to which Nigeria is a signatory.

True

False

Show answer & explanation

Answer: True

Answer

The statement is TRUE.

The statement is correct because the National Environmental Standards and Regulations Enforcement Agency (NESREA) Act of 2007 specifically empowers the agency under Section 7(c) to enforce compliance with international environmental treaties, conventions, and protocols to which Nigeria is a signatory.

Step-by-Step Solution

Examine the statutory powers granted under the NESREA Act of 2007.

Section 7 of the legislation outlines the specific enforcement responsibilities of the agency.

Determining agency jurisdiction requires analyzing its enabling legislation.

Assess whether NESREA's mandate includes international environmental agreements.

Section 7(c) explicitly instructs NESREA to enforce compliance with all international environmental treaties, protocols, and conventions ratified by Nigeria.

Domestic agencies in Nigeria are given statutory responsibility to execute international treaty commitments.

Key Concept

Statutory Mandates of Nigerian Environmental Agencies (NESREA)

Question 13764Question →

A manufacturing company requires long-term capital to construct a new assembly plant. Which of the following financial instruments should the company issue in the capital market to raise this capital?

Treasury bills

Cumulative preference shares

Commercial papers

Bankers' acceptances

Show answer & explanation

Answer: Cumulative preference shares

Answer

Cumulative preference shares are the appropriate financial instrument because they are traded on the capital market to raise long-term capital.

Cumulative preference shares represent long-term ownership capital issued in the capital market. They provide long-term funds suitable for capital investment projects such as building a new assembly plant.

Step-by-Step Solution

Identify the funding requirement

The company needs long-term funds to finance physical infrastructure (a new assembly plant).

Capital expenditures like building plants require long-term capital market instruments, not short-term money market instruments.

Classify the financial instruments by market type

Treasury bills, Commercial papers, and Bankers' acceptances belong to the money market (maturity under 1 year). Cumulative preference shares belong to the capital market (long-term/permanent funding).

Money market instruments finance short-term liquidity, whereas capital market securities finance long-term development and expansion.

Key Concept

Distinction between Money Market and Capital Market Instruments

Estimated Time:1m 0s

Question 13765Question →

Match each coastal marine process listed in Column A with its corresponding geomorphic action described in Column B.

Click a left item, then click its matching right item

Show answer & explanation

Answer

Hydraulic action matches compression and expansion of trapped air in cliff joints; Corrasion matches scouring and scraping of cliff faces by rock fragments; Longshore drift matches lateral movement of beach sediment along the coast; Attrition matches mutual wearing down and rounding of rock fragments colliding in turbulent water.

Hydraulic action is driven by water pressure compressing trapped air in cliff joints; corrasion uses wave-hurled rock tools to scour cliff surfaces; longshore drift transports beach load laterally through swash and backwash cycles; attrition rounds and reduces sediment particle sizes through mutual collisions.

Step-by-Step Solution

Analyze the mechanical effect of wave impact and air compression on cliff joints.

Trapped air compressed in rock crevices exerts immense hydraulic force, causing rock loosening and disintegration (Hydraulic Action).

Wave shock pushes air deep into cracks, creating explosive expansion when the wave recedes.

Distinguish between abrasive action on cliff faces versus particle collision within wave load.

Rock fragments hitting the cliff face act as abrasive tools (Corrasion), whereas rock fragments colliding with each other reduce in size and sharpen/round off (Attrition).

Corrasion erodes the mainland rock structure, while attrition alters the physical characteristics of the transported load itself.

Identify the process responsible for transport of coastal sediment along a beach.

The combined angled swash and straight backwash move sediment laterally along the shoreline (Longshore Drift).

Wind direction dictates the angle of wave approach, while gravity pulls water back straight down the slope of the beach.

Key Concept

Coastal Marine Processes and Mechanisms

Estimated Time:1m 0s

Question 13766Question →

Kinsmen Manufacturing Company, seeking to cover a high-value industrial facility, enters into a direct contract with three separate insurance firms where each firm agrees to absorb a specified percentage of the total risk directly with the insured. Which insurance concept is illustrated by this risk-sharing arrangement?

Co-insurance

Reinsurance

Underwriting

Subrogation

Show answer & explanation

Answer: Co-insurance

Answer

Co-insurance

Co-insurance is an insurance arrangement where two or more insurance companies directly enter into a contract with a single insured to share a large risk in agreed percentages.

Step-by-Step Solution

Analyze the contractual relationship described in the scenario.

The insured (Kinsmen Manufacturing Company) holds direct contractual relationships with multiple insurance companies simultaneously for covering portions of the same risk.

Direct contractual arrangement between the policyholder and multiple insurers for sharing risk exposure defines co-insurance.

Distinguish co-insurance from reinsurance and underwriting.

Reinsurance is a transaction strictly between two insurers where the insured has no direct contract with the reinsurer, whereas underwriting is risk assessment prior to policy issuance.

This confirms that co-insurance is the correct commercial term for joint direct coverage.

Key Concept

Co-insurance vs Reinsurance operational relationship

Question 13767Question →

Match each specified geographical area of Nigeria listed on the left with its predominant settlement pattern and population density driver listed on the right.

Click a left item, then click its matching right item

Show answer & explanation

Answer

Yoruba Cocoa Belt matches with high density nucleated towns linked to cocoa and historical urban kingdoms; Jos Plateau Upland Region matches with dense settlements influenced by tin mining and temperate climate; Middle Belt matches with sparse population density and dispersed settlement; South-Eastern Rural Belt matches with extremely high rural population density and severe gully erosion.

Each region in Nigeria reflects specific physical, historical, and economic drivers of population density and settlement morphology. South-Western cocoa areas are nucleated and dense; Jos Plateau attracted population via mining and favorable climate; the Middle Belt was sparsely settled due to historical slave raids and tsetse infestation; while South-Eastern agricultural areas feature intense rural population density and severe gully erosion.

Step-by-Step Solution

Analyze the human geography and physical drivers of South-Western Nigeria.

Identify that cocoa production combined with pre-colonial Yoruba urbanization created dense nucleated settlements.

Economic prosperity from cocoa and historic town-centered culture favor nucleated settlement patterns.

Examine the settlement factors of the Jos Plateau highlands.

Identify climate, defense, and mineral resource extraction (tin and columbite) as primary population pull factors.

Cool highland climate, absence of tsetse flies, historical defense, and mining operations attracted dense populations.

Assess the population density factors in the Middle Belt of Nigeria.

Recognize that historic slave-raiding and tsetse fly infestation created low population density with dispersed settlements.

Environmental hazards and historical disturbances led to sparse population distribution across the guinea savanna belt.

Examine population dynamics in South-Eastern Nigeria (Imo-Anambra core).

Match high rural population density with severe environmental stress such as gully erosion and land fragmentation.

Dense agricultural population on vulnerable sandstone soils accelerates gully erosion.

Key Concept

Factors influencing regional population density and settlement patterns in Nigeria

Question 13768Question →

The threshold wavelength for photoelectric emission from a metallic surface is $500\text{ nm}$ . What is the work function of the metal in electron-volts ( $\text{eV}$ )? [Take Planck's constant $h = 6.6 \times 10^{-34}\text{ J s}$ , speed of light $c = 3.0 \times 10^{8}\text{ m s}^{-1}$ , and $1\text{ eV} = 1.6 \times 10^{-19}\text{ J}$ ]

Show answer & explanation

Answer: 2.48

Answer

The work function of the metal is

2.48\text{ eV}

(or

2.475\text{ eV}

The work function

W_0

is calculated using

W_0 = \frac{hc}{\lambda_0}

. Substituting

h = 6.6 \times 10^{-34}\text{ J s}

c = 3.0 \times 10^8\text{ m s}^{-1}

, and

\lambda_0 = 500 \times 10^{-9}\text{ m}

gives

W_0 = 3.96 \times 10^{-19}\text{ J}

. Converting to electron-volts yields

\frac{3.96 \times 10^{-19}}{1.6 \times 10^{-19}} = 2.475\text{ eV}

, which rounds to

2.48\text{ eV}

Step-by-Step Solution

State the relationship between work function and threshold wavelength

W_0 = \frac{hc}{\lambda_0}

The work function is the minimum energy required to liberate an electron, which corresponds to the maximum wavelength (threshold wavelength

\lambda_0

) that can cause emission.

Substitute the physical constants and threshold wavelength to calculate

W_0

in joules

W_0 = \frac{6.6 \times 10^{-34} \times 3.0 \times 10^{8}}{500 \times 10^{-9}} = 3.96 \times 10^{-19}\text{ J}

Evaluating

hc / \lambda_0

yields the work function energy in standard SI units (Joules).

Convert the calculated work function into electron-volts

W_0 = \frac{3.96 \times 10^{-19}}{1.6 \times 10^{-19}} = 2.475\text{ eV}

Dividing the energy in Joules by

1.6 \times 10^{-19}\text{ J/eV}

converts the value to electron-volts.

Key Concept

Work Function and Threshold Wavelength Relationship

Question 13769Question →

Match each domestic payment instrument or mechanism with its corresponding commercial operation feature.

Click a left item, then click its matching right item

Show answer & explanation

Answer

Credit Transfer matches with buyer-initiated direct bank payments; Direct Debit matches with seller-initiated variable account collections; Crossed Cheque matches with payment restricted to account deposit via transverse lines; Legal Tender matches with legally mandated currency notes and coins.

Each payment instrument aligns directly with its legal and operational characteristics in domestic trade: Credit Transfer is debtor-driven for multiple accounts, Direct Debit is creditor-driven for variable amounts, Crossed Cheques require bank clearance for security, and Legal Tender carries statutory acceptance authority.

Step-by-Step Solution

Analyze Credit Transfer (Giro)

Identified as a credit mechanism pushed by the debtor/buyer to credit creditors directly.

Credit transfer originates from the account holder sending money to specified vendors.

Analyze Direct Debit

Identified as a pull payment initiated by the creditor/seller for variable transaction amounts.

Unlike standing orders which are fixed sums pushed by the debtor, direct debits are pulled by creditors for varying bills.

Analyze Crossed Cheque

Identified as a security measure restricting encashment at the counter.

Crossing a cheque forces the funds to pass through a bank account for traceability.

Analyze Legal Tender

Identified as legally recognized currency notes and coins.

By law, legal tender cannot be refused by a creditor when offered to settle an existing monetary obligation.

Key Concept

Classification and functional features of home trade payment mechanisms and instruments.

Question 13770Question →

Gases under atmospheric pressure are generally poor conductors of electricity. However, when the gas pressure inside a discharge tube is lowered to approximately $0.1\text{ mmHg}$ under a high potential difference, electrical conduction readily occurs. What is the primary physical reason for this increase in electrical conductivity at reduced pressures?

The mean free path of ions increases, enabling them to gain sufficient kinetic energy to produce collisional ionization.

The frequency of molecular collisions increases significantly, generating thermal ions spontaneously.

The gas density increases at low pressure, providing a greater number of charge carriers per unit volume.

Neutral gas molecules decompose spontaneously into electrons without requiring collision energy.

Show answer & explanation

Answer: The mean free path of ions increases, enabling them to gain sufficient kinetic energy to produce collisional ionization.

Answer

The increased conductivity at low pressures occurs because the mean free path of free ions increases, allowing them to accelerate under the high electric field and gain enough kinetic energy to cause ionization by collision with neutral gas atoms.

The correct option correctly states that reducing gas pressure increases the mean free path of ions. Under high applied potential differences, these ions travel longer distances uninterrupted, acquiring enough kinetic energy to ionize neutral gas molecules upon impact and causing electrical breakdown.

Step-by-Step Solution

Analyze gas density at reduced pressure

Lowering the gas pressure reduces the number density of molecules inside the discharge tube.

Gas pressure is directly proportional to molecule concentration.

Determine the impact on mean free path

The mean free path (average distance traveled between successive collisions) increases.

Fewer gas molecules per unit volume mean fewer obstructions per unit distance.

Relate mean free path to kinetic energy and ionization

Ions accelerate over longer distances, acquiring kinetic energy

K = qE \cdot d

exceeding the ionization potential of the gas, causing collisional ionization.

Sufficient kinetic energy allows colliding ions to knock electrons out of neutral atoms, generating avalanche conduction.

Key Concept

Collisional Ionization and Mean Free Path in Gas Discharge

Question 13771Question →

A Nigerian exporter draws a written, unconditional financial order requiring an overseas buyer to pay a specific sum of money either on demand or at a predetermined future date. Which commercial document in foreign trade does this describe?

Bill of Exchange

Certificate of Origin

Advice Note

Balance of Payments

Show answer & explanation

Answer: Bill of Exchange

Answer

Bill of Exchange

A Bill of Exchange is an unconditional order in writing, addressed by an exporter to an importer, requiring the importer to pay on demand or at a fixed future time a specified sum of money. It serves as a key instrument of payment and credit in international trade.

Step-by-Step Solution

Identify the primary function of the document described in the scenario

The document acts as a financial order requiring payment of a specified sum at sight or at a future date.

In international trade, credit and payment settlements between buyers and sellers in different countries are routinely executed using negotiable drafts.

Match the description to standard foreign trade commercial documents

An unconditional written payment order issued by a drawer to a drawee is legally defined as a Bill of Exchange.

It functions as both an instrument of debt settlement and a credit tool in foreign commerce.

Key Concept

Commercial Documents in Foreign Trade - Bill of Exchange

Question 13772Question →

A petroleum refining enterprise expands its operations by acquiring a crude oil shipping fleet to secure raw transport and a chain of retail petrol stations to sell finished fuel directly to consumers. Which type of business combination is illustrated by this strategic expansion?

Vertical integration

Horizontal integration

Cartel arrangement

Conglomerate combination

Show answer & explanation

Answer: Vertical integration

Answer

Vertical integration is the correct classification for combining businesses across consecutive stages of production and distribution.

Vertical integration occurs when a business combines with other firms at different, sequential stages of the same industry's supply and distribution chain. Acquiring crude transport (upstream supply) and retail stations (downstream distribution) secures control from raw material handling to final sales.

Step-by-Step Solution

Analyze the operational relationship between the acquiring firm and the acquired businesses.

The enterprise operates in petroleum refining (midstream processing), acquires shipping logistics for crude oil (upstream supply), and retail stations (downstream sales).

Identifying the supply chain positions determines whether the combination moves across levels of production or across separate industries.

Map the relationship to the appropriate business combination classification.

Combining sequential stages of production, processing, and distribution into one company constitutes vertical integration (backward to crude shipping and forward to retail distribution).

Vertical integration specifically links complementary stages of supply and distribution under unified control.

Key Concept

Vertical Integration in Business Combinations

Estimated Time:1m 0s

Question 13773Question →

Rubber (*Hevea brasiliensis*) cultivation in Nigeria is predominantly concentrated in the rainforest belt of Edo, Delta, and Cross River States rather than the Northern Savanna. Which environmental factor is primarily responsible for this spatial distribution?

Abundant annual rainfall above

1500\text{ mm}

and high relative humidity year-round

Prolonged dry harmattan seasons and light sandy soils

Low relative humidity combined with wide diurnal temperature ranges

Poorly drained, heavy clay soils with seasonal waterlogging

Show answer & explanation

Answer: Abundant annual rainfall above $1500\text{ mm}$ and high relative humidity year-round

Answer

Rubber cultivation in Nigeria relies on heavy annual rainfall exceeding

1500\text{ mm}

and high relative humidity year-round, conditions that occur in the southern rainforest belt.

Rubber (*Hevea brasiliensis*) is a tropical rainforest tree crop requiring heavy rainfall (

>1500\text{ mm}

annually), high relative humidity, and deep, well-drained soils. These conditions exist in southern Nigerian states such as Edo, Delta, and Cross River.

Step-by-Step Solution

Identify the ecological requirements of perennial tree cash crops like rubber

Rubber trees require warm temperatures (

24-28^{\circ}\text{C}

), high annual rainfall (

>1500\text{ mm}

), and consistently high humidity without long drought periods.

Perennial tree crops demand continuous moisture supply to maintain foliage growth and latex production.

Analyze the spatial environmental gradient across Nigeria

Southern states like Edo, Delta, and Cross River lie in the humid rainforest belt, whereas northern states experience severe dry harmattan seasons and low annual rainfall.

Nigeria's rainfall follows a south-to-north gradient, decreasing significantly toward the northern savanna.

Select the option describing the favorable rainforest conditions

The option citing abundant rainfall above

1500\text{ mm}

and high relative humidity year-round correctly explains why rubber production is concentrated in the south.

This directly matches the physiological requirements of the crop.

Key Concept

Ecological requirements and spatial distribution of tree cash crops in Nigeria

Question 13774Question →

Arrange the following economic activities in the correct logical sequence along the chain of production, moving from the primary occupation stage through to the final tertiary stage.

Drag items to arrange them in the correct order

Show answer & explanation

Answer

The correct sequence begins with agricultural cotton cultivation (Primary Occupation), followed by textile manufacturing in a mill (Secondary Occupation), commercial warehousing and insurance of fabric (Tertiary Occupation - Auxiliaries to Trade), and concludes with retail distribution to final consumers (Tertiary Occupation - Trade).

Production moves sequentially from primary resource acquisition (cotton farming), through secondary manufacturing (textile weaving), to tertiary commercial support (warehousing and insurance), and ends with tertiary retail trade.

Step-by-Step Solution

Identify the primary occupation step

Cultivating and harvesting raw cotton from agricultural farmland

Primary occupations consist of extractive and agricultural activities that obtain raw materials directly from nature.

Identify the secondary occupation step

Spinning cotton fibers into yarn and weaving textiles inside a manufacturing factory

Secondary occupations convert raw materials obtained from primary industries into finished or semi-finished products.

Identify the auxiliary commercial service step (tertiary stage 1)

Warehousing and insuring bulk fabric shipments during wholesale distribution

Commercial services such as warehousing and insurance support and protect goods in transition before they reach buyers.

Identify the final trade distribution step (tertiary stage 2)

Retailing finished clothing garments to end consumers in commercial retail outlets

Retailing completes the commercial distribution process by selling products to the final consumer.

Key Concept

Sequential Inter-relationship of Primary, Secondary, and Tertiary Occupations

Question 13775Question →

Match each rock specimen in Column I with its primary mode of geological formation and major economic importance described in Column II.

Click a left item, then click its matching right item

Show answer & explanation

Answer

Obsidian matches with the glassy extrusive igneous rock used for surgical tools and ornaments; Gypsum matches with the evaporite sedimentary rock used for plaster of Paris; Schist matches with the foliated metamorphic rock derived from shale; and Anthracite matches with the metamorphosed high-grade coal valued as a clean-burning fuel.

Obsidian is a volcanic glass produced by extremely rapid cooling of lava. Gypsum forms chemically via evaporite precipitation in saline bodies of water and is mined for plaster production. Schist is produced through regional metamorphism of shale, characterized by coarse platy mica foliation. Anthracite forms when intense pressure and heat metamorphose coal into a high-density, low-smoke fuel source.

Step-by-Step Solution

Classify each rock specimen in Column I by its genetic origin.

Obsidian is volcanic (extrusive igneous), Gypsum is chemical sedimentary (evaporite), Schist is regional metamorphic, and Anthracite is metamorphosed carbonaceous rock.

Establishing the correct genetic rock category simplifies identifying the corresponding formation environment and texture.

Link each specimen to its unique structural characteristic and industrial application.

Obsidian pairs with glassy texture/cutting blades; Gypsum pairs with evaporite precipitation/plaster manufacture; Schist pairs with mica foliation/regional metamorphism of shale; Anthracite pairs with intense thermal-pressure transformation/clean fuel.

Evaluating both the formation process and practical economic utility yields unambiguous matching pairs.

Key Concept

Genetic classification, structural characteristics, and economic utility of igneous, sedimentary, and metamorphic rocks.

Estimated Time:1m 30s

Question 13776Question →

At a meteorological station, a weather observer uses a Campbell-Stokes recorder featuring a glass sphere that focuses sunlight onto a calibrated paper card. Which atmospheric parameter is directly measured by this instrument, and what is its standard unit of measurement?

Duration of bright sunshine, measured in hours

Solar radiation intensity, measured in Watts per square metre

Cloud cover density, measured in oktas

Atmospheric humidity, measured as a percentage

Show answer & explanation

Answer: Duration of bright sunshine, measured in hours

Answer

The Campbell-Stokes recorder measures the duration of bright sunshine in hours.

The Campbell-Stokes sunshine recorder utilizes a spherical glass lens to focus direct rays of the sun onto a specially treated cardboard strip. The focused ray burns a char line whenever the sun shines brightly, allowing observers to measure the total duration of sunshine in hours for a given day.

Step-by-Step Solution

Identify the instrument working mechanism

The instrument consists of a solid glass sphere mounted in a bowl frame holding a sensitized paper card.

The glass sphere acts as a lens that focuses direct sunlight into a hot spot.

Determine the atmospheric parameter recorded

As the sun moves across the sky, the focused beam burns a path along the calibrated card, indicating the length of time bright sunshine was present.

The burn trace length directly corresponds to sunshine duration, measured in hours per day.

Match the parameter with its unit and rule out mismatching instruments

Duration of bright sunshine is measured in hours, while solar radiation intensity (Watts/m²), cloud cover (oktas), and relative humidity (%) require different instruments.

Each meteorological parameter has specific dedicated instrumentation and units.

Key Concept

Weather Elements, Instruments, and Measurements

Estimated Time:1m 0s

Question 13777Question →

The dynamic pressure $P$ exerted by a moving fluid depends on its density $\rho$ and flow velocity $v$ according to the relationship $P = k \rho^a v^b$ , where $k$ is a dimensionless constant. What is the value of the exponent $b$ ?

Show answer & explanation

Answer: 2

Answer

The value of the exponent

b

is 2.

Equating the exponent of time (T) on both sides of the dimensional equation

\text{M L}^{-1} \text{T}^{-2} = \text{M}^a \text{L}^{-3a + b} \text{T}^{-b}

yields

-2 = -b

, giving

b = 2

Step-by-Step Solution

Determine the base dimensions of all physical quantities in the equation.

Pressure

[P] = \text{M L}^{-1} \text{T}^{-2}

, Density

[\rho] = \text{M L}^{-3}

, and Velocity

[v] = \text{L T}^{-1}

Dimensional analysis requires converting derived physical quantities into fundamental dimensions of Mass (M), Length (L), and Time (T).

Apply dimensional homogeneity by substituting the dimensions into

P = k \rho^a v^b

\text{M L}^{-1} \text{T}^{-2} = \text{M}^a \text{L}^{-3a + b} \text{T}^{-b}

The principle of dimensional homogeneity states that exponents of M, L, and T must match on both sides of a physically correct equation.

Equate the corresponding exponents for time (T) and solve for

b

-2 = -b \implies b = 2

Matching the powers of T directly yields the numerical value of exponent

b

Key Concept

Principle of Dimensional Homogeneity and Dimensional Analysis

Question 13778Question →

Match each role of insurance in commercial transactions listed on the left with its corresponding operational benefit to business and trade on the right.

Click a left item, then click its matching right item

Show answer & explanation

Answer

Risk Pooling and Transfer matches with spreading the financial impact of losses across policyholders; Provision of Credit Collateral matches with enhancing business creditworthiness for securing loans; Encouragement of Enterprise & Capital Investment matches with giving entrepreneurs confidence to undertake high-risk ventures; Loss Control and Risk Prevention matches with enforcing safety standards and inspection protocols.

Each role of insurance corresponds directly to a specific commercial advantage: risk pooling distributes financial losses across a collective fund, credit collateral improves access to bank financing, enterprise encouragement promotes capital commitment in large projects, and risk prevention improves physical safety standards.

Step-by-Step Solution

Analyze each key function of insurance within commercial activities.

Identify how each function operates conceptually to support trade and commerce.

Insurance serves multiple economic functions ranging from financial indemnification to credit enhancement.

Align each insurance role on the left with its corresponding business outcome on the right.

Construct the exact matches based on standard commercial insurance principles.

Proper matching demonstrates accurate knowledge of how insurance facilitates economic development and trade.

Key Concept

Role and Importance of Insurance in Business and Commerce

Estimated Time:1m 30s

Question 13779Question →

The supervising Minister of a statutory public corporation holds regulatory powers over the organization. Which of the following functions falls strictly within the executive scope of the Board of Directors rather than the supervising Minister?

Managing routine internal operations and executing day-to-day administrative policies

Transferring state ownership and equity shares of the enterprise to private investors

Classifying the utility operations as non-commercial direct personal services exempt from public accounting

Drafting Articles of Association to regulate profit dividend distribution among private shareholders

Show answer & explanation

Answer: Managing routine internal operations and executing day-to-day administrative policies

Answer

Managing routine internal operations and executing day-to-day administrative policies

In public enterprises, particularly statutory public corporations, control is divided between ministerial oversight and board administration. The supervising Minister exercises external control by issuing broad policy directives, appointing board members, and approving major capital expenditure. The Board of Directors, however, retains internal autonomy to manage day-to-day administrative operations and implement routine policies.

Step-by-Step Solution

Analyze the division of control in public statutory corporations.

Ministerial control operates at the macro/policy level, whereas the Board of Directors operates at the operational/administrative level.

Public corporations are given administrative autonomy so that executive officers and the Board can manage daily affairs efficiently without political micro-management.

Differentiate Board responsibilities from Ministerial and Legislative duties.

The Minister approves major capital expansion and issues general policy directives, while the Board oversees daily administrative operations.

Interference by the Minister in daily routine management defeats the purpose of creating an autonomous public corporation.

Key Concept

Distinction between Ministerial Control and Board Management in Public Enterprises

Estimated Time:1m 0s

Question 13780Question →

In cold, humid coniferous forest biomes, the slow decomposition of resinous needle litter releases organic acids that drive intense chemical leaching. Which soil formation process occurs under these conditions, producing a light-colored, mineral-bleached horizon beneath the topsoil?

Podzolization

Calcification

Salinization

Gleization

Show answer & explanation

Answer: Podzolization

Answer

Podzolization is the dominant soil-forming process in cool, humid coniferous forest environments that yields a bleached, heavily leached ash-grey horizon.

Podzolization is the soil-forming (pedogenic) process characteristic of cool, wet climates under coniferous forests. The slow decay of acidic pine needles produces organic acids that strip bases, iron, and aluminum from the upper horizon, leaving behind a distinctive ash-grey, silica-rich leached layer.

Step-by-Step Solution

Identify environmental conditions in the scenario

Cold, humid climate with coniferous needle-leaf vegetation.

Vegetation type and climate directly govern the composition of organic humus and soil moisture regime.

Analyze the chemical process resulting from coniferous litter

Pine needle decomposition creates strong organic acids that leach soluble bases, iron, and aluminum oxides downward.

Acidic percolating water causes intense eluviation in the upper horizons.

Match the process with its corresponding pedogenic term

Podzolization produces Podzols (Spodosols) characterized by a light-colored, ash-grey leached horizon.

Podzolization specifically describes acid leaching in cool coniferous forest biomes.

Key Concept

Podzolization and Zonal Soil Processes

PreviousPage 689 / 697Next

All practice questions

Answer

Step-by-Step Solution

Key Concept

Common Mistakes

Answer

Step-by-Step Solution

Key Concept

Common Mistakes

Answer

Step-by-Step Solution

Key Concept

Common Mistakes

Answer

Step-by-Step Solution

Key Concept

Common Mistakes

Answer

Step-by-Step Solution

Key Concept

Common Mistakes

Answer

Step-by-Step Solution

Key Concept

Common Mistakes

Answer

Step-by-Step Solution

Key Concept

Common Mistakes

Answer

Step-by-Step Solution

Key Concept

Common Mistakes

Answer

Step-by-Step Solution

Key Concept

Common Mistakes

Answer

Step-by-Step Solution

Key Concept

Common Mistakes

Answer

Step-by-Step Solution

Key Concept

Common Mistakes

Answer

Step-by-Step Solution

Key Concept

Common Mistakes

Answer

Step-by-Step Solution

Key Concept

Common Mistakes

Answer

Step-by-Step Solution

Key Concept

Common Mistakes

Answer

Step-by-Step Solution

Key Concept

Common Mistakes

Answer

Step-by-Step Solution

Key Concept

Common Mistakes

Answer

Step-by-Step Solution

Key Concept

Common Mistakes

Answer

Step-by-Step Solution

Key Concept

Common Mistakes

Answer

Step-by-Step Solution

Key Concept

Common Mistakes

Answer

Step-by-Step Solution

Key Concept