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 13681Question →

A garment manufacturing company imports raw cotton subject to customs duties. The company processes the cotton into finished apparel entirely intended for sale in external markets. Upon exporting the finished apparel, the firm successfully claims a refund from the customs authority for the import duties previously paid on the raw materials. Which customs control mechanism is being utilized in this scenario?

Duty drawback scheme

Bonded warehousing facility

Preferential tariff arrangement

Foreign exchange rationing control

Show answer & explanation

Answer: Duty drawback scheme

Answer

The duty drawback scheme is the customs control mechanism that entitles manufacturers to a full or partial refund of import duties paid on raw materials once the finished goods derived from those materials are exported.

The correct answer is the duty drawback scheme. Under customs regulations, duty drawback is an export promotion tool designed to relieve domestic exporters of import duty costs on raw materials, components, or packaging that are incorporated into products sold in foreign markets.

Step-by-Step Solution

Analyze the operational scenario described in the stem.

Identified that raw materials were imported with duty paid, processed into finished goods, and exported out of the country, triggering a duty refund claim.

Determining the flow of goods and funds is required to identify the matching trade and customs instrument.

Distinguish between duty deferment, duty concession, and duty refund mechanisms in international trade.

Duty drawback specifically refers to the reimbursement of import duties paid on imported inputs when the final products are re-exported.

Exporters are encouraged to compete in international markets without bearing the burden of domestic tariff costs on raw materials.

Key Concept

Duty Drawback and Customs Control Measures

Question 13682Question →

Which of the following combinations of fundamental SI base units is equivalent to the volt ( $\text{V}$ ), the SI unit of electric potential difference?

\text{kg}\cdot\text{m}^2\cdot\text{s}^{-3}\cdot\text{A}^{-1}

\text{kg}\cdot\text{m}^2\cdot\text{s}^{-2}\cdot\text{A}^{-1}

\text{kg}\cdot\text{m}^2\cdot\text{s}^{-3}\cdot\text{A}

\text{kg}\cdot\text{m}\cdot\text{s}^{-2}\cdot\text{A}^{-1}

Show answer & explanation

Answer: $\text{kg}\cdot\text{m}^2\cdot\text{s}^{-3}\cdot\text{A}^{-1}$

Answer

\text{kg}\cdot\text{m}^2\cdot\text{s}^{-3}\cdot\text{A}^{-1}

Electric potential difference (

V

) is defined as work done (

W

) per unit charge (

Q

), giving

V = \frac{W}{Q}

. In fundamental SI units, work is

\text{kg}\cdot\text{m}^2\cdot\text{s}^{-2}

and electric charge is

\text{A}\cdot\text{s}

. Dividing work by charge yields

\frac{\text{kg}\cdot\text{m}^2\cdot\text{s}^{-2}}{\text{A}\cdot\text{s}} = \text{kg}\cdot\text{m}^2\cdot\text{s}^{-3}\cdot\text{A}^{-1}

Step-by-Step Solution

State the defining physical equation for electric potential difference.

V = \frac{W}{Q}

, where

V

is electric potential,

W

is work done in joules, and

Q

is electric charge in coulombs.

Electric potential difference is defined as work done per unit electric charge.

Express work (

W

) in terms of fundamental SI base units.

W = \text{Force} \times \text{distance} = (\text{kg}\cdot\text{m}\cdot\text{s}^{-2}) \times \text{m} = \text{kg}\cdot\text{m}^2\cdot\text{s}^{-2}

Work is the product of force and displacement, where force is mass times acceleration.

Express electric charge (

Q

) in terms of fundamental SI base units.

Q = I \times t = \text{A}\cdot\text{s}

Electric charge is defined as electric current multiplied by time.

Divide the base units of work by the base units of electric charge.

V = \frac{\text{kg}\cdot\text{m}^2\cdot\text{s}^{-2}}{\text{A}\cdot\text{s}} = \text{kg}\cdot\text{m}^2\cdot\text{s}^{-3}\cdot\text{A}^{-1}

Simplifying the exponents gives the equivalent combination of fundamental SI base units.

Key Concept

Expressing derived SI units in terms of fundamental (base) SI units.

Question 13683Question →

Match each trade control instrument or customs document on the left with its primary function or operational description on the right.

Click a left item, then click its matching right item

Show answer & explanation

Answer

Trade Embargo matches with a total statutory prohibition on imports/exports; Ad Valorem Tariff matches with a duty levied as a fixed percentage of monetary value; Import Quota matches with a quantitative limitation on allowed import volume; Consular Invoice matches with a document authenticated by an importing nation's representative to prevent under-invoicing.

Each trade restriction instrument and customs document corresponds to its exact legal and operational mechanism: a trade embargo completely halts targeted trade activity; an ad valorem tariff assesses taxes relative to declared monetary value; an import quota establishes strict physical or quantitative limits; and a consular invoice provides pre-export verification by the importing nation's consul to control fraud and ensure proper duty collection.

Step-by-Step Solution

Identify the primary function of quantitative barriers versus price-based tariffs.

Import Quota sets a physical limit on quantity, whereas Ad Valorem Tariff charges a percentage based on goods' monetary value.

Differentiating structural quota controls from percentage valuation tariffs clarifies quantitative restrictions.

Analyze trade prohibitions and documentation controls.

Trade Embargo completely bans specified trade, while a Consular Invoice is an official verification document signed by a consular official abroad.

Distinguishing absolute trade bans from official customs authentication documentation completes all correct pairings.

Key Concept

Classification and Functions of Trade Barriers, Tariffs, and Customs Documentation

Question 13684Question →

Complete the statement regarding global environmental initiatives by identifying the correct treaty.

Fill in the blanks below

The international environmental agreement adopted in 2001 to protect human health and ecosystems by restricting and eliminating the production of persistent organic pollutants (POPs) such as DDT and PCBs is the Convention.

Show answer & explanation

Answer

Stockholm

The Stockholm Convention on Persistent Organic Pollutants, adopted in 2001, is a global treaty intended to protect human health and the environment from toxic chemicals (POPs) that remain intact in the environment for long periods, become widely distributed geographically, and accumulate in the fatty tissue of humans and wildlife.

Step-by-Step Solution

Analyze the environmental target specified in the stem.

The target involves persistent organic pollutants (POPs), specifically toxic chemicals like DDT and PCBs.

Different international treaties target distinct environmental hazards, such as hazardous waste, ozone depletion, or toxic chemicals.

Match the environmental target to its establishing global agreement.

The treaty established in 2001 in Sweden to eliminate or restrict POPs is the Stockholm Convention.

The Stockholm Convention specifically focuses on bioaccumulative and long-lasting toxic industrial chemicals and pesticides.

Key Concept

Stockholm Convention on Persistent Organic Pollutants (POPs)

Estimated Time:1m 0s

Question 13685Question →

Match each Nigerian mineral deposit or energy generating station on the left with its primary location on the right.

Click a left item, then click its matching right item

Show answer & explanation

Answer

Glass sand matches with Igbokoda (Ondo State); Salt brine deposits match with Uburu (Ebonyi State); Coking coal reserves match with Lafia-Obobi (Nasarawa State); Afam thermal power station matches with Rivers State.

Glass sand is located at Igbokoda in Ondo State, salt brine deposits occur at Uburu in Ebonyi State, coking coal is found at Lafia-Obobi in Nasarawa State, and the gas-fired Afam thermal power station is located in Rivers State.

Step-by-Step Solution

Match glass sand with its main industrial supply site.

Igbokoda in Ondo State is the principal location for glass sand mining.

Coastal sediment deposits in Ondo State yield pure silica sand required for glass making.

Identify the primary site for salt brine deposits.

Uburu in Ebonyi State is known for brine springs and salt production.

The Cretaceous rock formations of the Benue Trough near Uburu contain rich salt brines.

Locate Nigeria's key coking coal deposit area.

Lafia-Obobi in Nasarawa State holds major coking coal seams.

Unlike sub-bituminous coal of Enugu, coal in the Middle Benue Trough around Lafia-Obobi has coking properties.

Identify the state host to Afam power station.

Afam thermal power station is situated in Rivers State.

The plant utilizes natural gas piped from local Niger Delta oilfields in Rivers State.

Key Concept

Distribution of mineral resources and thermal energy infrastructure in Nigeria

Question 13686Question →

In a gas discharge tube operated at a very low pressure of approximately $0.01\text{ mmHg}$ , cathode rays are produced. Which of the following statements accurately describes a characteristic property of cathode rays?

They are electromagnetic waves of extremely high frequency.

They cast sharp shadows of opaque objects placed in their path.

They are deflected toward the negatively charged plate in an electric field.

They originate from the anode and travel toward the cathode.

Show answer & explanation

Answer: They cast sharp shadows of opaque objects placed in their path.

Answer

Cathode rays cast sharp shadows of opaque objects placed in their path because they travel in straight lines.

The correct option correctly states that cathode rays cast sharp shadows of opaque objects in their path. This phenomenon demonstrates that cathode rays travel in straight lines from the cathode.

Step-by-Step Solution

Identify the nature of cathode rays

Cathode rays are streams of electrons emitted from the cathode in a low-pressure discharge tube.

The high electric potential difference accelerates free electrons away from the cathode surface.

Analyze propagation behavior

Cathode rays travel normal to the cathode in straight lines.

Because they travel in straight lines, any opaque barrier (such as a metal cross) blocks the stream completely, casting a clear shadow on the fluorescent tube wall.

Key Concept

Properties of Cathode Rays

Question 13687Question →

A projectile is launched from level ground with an initial velocity of $50\text{ m/s}$ at an angle of $60^\circ$ to the horizontal. Taking acceleration due to gravity $g = 10\text{ m/s}^2$ , what is the speed of the projectile at the highest point of its trajectory?

0\text{ m/s}

25\text{ m/s}

25\sqrt{3}\text{ m/s}

50\text{ m/s}

Show answer & explanation

Answer: $25\text{ m/s}$

Answer

The speed of the projectile at its highest point is

25\text{ m/s}

In 2D projectile motion, the horizontal component of velocity remains constant throughout flight because no horizontal force acts on the object. At the highest point, vertical velocity reduces to zero, making the total speed equal exclusively to the horizontal velocity component:

v = u \cos 60^\circ = 50 \times 0.5 = 25\text{ m/s}

Step-by-Step Solution

Resolve the initial velocity into horizontal and vertical components

u_x = u \cos\theta = 50 \cos 60^\circ = 25\text{ m/s}

and

u_y = u \sin\theta = 50 \sin 60^\circ = 25\sqrt{3}\text{ m/s}

Projectile motion decomposes into independent horizontal (constant velocity) and vertical (uniform acceleration) components.

Determine the vertical component of velocity at maximum height

v_y = 0\text{ m/s}

At the apex of the parabolic path, the upward vertical motion momentarily stops before descending.

Calculate total speed at the apex using vector magnitude

v = \sqrt{v_x^2 + v_y^2} = \sqrt{25^2 + 0^2} = 25\text{ m/s}

Because horizontal acceleration is zero (ignoring air resistance),

v_x = u_x = 25\text{ m/s}

throughout the flight.

Key Concept

Horizontal Component of Velocity in Projectile Motion

Question 13688Question →

Along a topographical slope (soil catena), permanent waterlogging in the low-lying valley bottom causes severe oxygen depletion. This anaerobic environment leads to the biochemical reduction of ferric iron compounds into ferrous iron, imparting a distinct sticky, greyish-blue appearance to the soil profile. Which pedogenic process is responsible for this soil transformation?

Gleization

Mechanical weathering

Metamorphic recrystallization

Mass wasting

Show answer & explanation

Answer: Gleization

Answer

Gleization is the pedogenic process operating under anaerobic, waterlogged conditions that converts ferric iron to ferrous iron, producing greyish-blue soil profiles.

The process described is gleization (also known as gleying). It occurs in hydromorphic soils where saturated, anaerobic conditions prevent normal oxidation. Anaerobic bacteria reduce ferric compounds (

Fe^{3+}

) to ferrous compounds (

Fe^{2+}

), which imparts a characteristic bluish-grey or mottled color to the soil horizon.

Step-by-Step Solution

Analyze the environmental conditions described in the stem.

Identified permanent waterlogging, oxygen deficiency (anaerobic environment), and low-lying topography at the base of a catena.

Water displacement of soil air suppresses aerobic decomposition and oxidation.

Determine the chemical reaction resulting from anaerobic conditions.

Redox state shifts from oxidation (

Fe^{3+}

ferric, reddish) to reduction (

Fe^{2+}

ferrous, greyish-blue).

Anaerobic microorganisms use ferric iron as an electron acceptor in place of oxygen.

Identify the matching pedogenic term.

Gleization (or gleying) specifically defines this process of soil development under waterlogged, reducing conditions.

Other processes listed refer to rock disintegration, metamorphism, or gravitational slope transport.

Key Concept

Pedogenic processes and Soil Catena dynamics

Estimated Time:1m 30s

Question 13689Question →

A large-scale garment manufacturing firm reduces its average cost per unit by purchasing raw materials in bulk at heavy discounts and negotiating lower freight rates for bulk transportation. Which specific internal economy of scale does this cost reduction represent?

External economies of scale

Commercial economies of scale

Economies of specialization

Reduction in factor rewards

Show answer & explanation

Answer: Commercial economies of scale

Answer

Commercial economies of scale

Commercial economies of scale occur when an enterprise leverages its large size to purchase inputs in bulk at discounted prices and secure preferential transport rates. Because these financial benefits are derived directly from the firm's commercial operations, this cost reduction represents a commercial economy of scale.

Step-by-Step Solution

Analyze the operational advantage described in the scenario.

The firm receives quantity discounts on raw materials and reduced transport tariffs due to large shipment volumes.

Identifying the mechanism of savings clarifies which category of internal economies of scale applies.

Classify the advantage within production economics.

Savings realized through buying, selling, and bulk freight negotiations are classified as commercial economies of scale.

Large firms use their market power to bargain for better trading terms, lowering overall unit costs.

Key Concept

Commercial Economies of Scale

Estimated Time:1m 0s

Question 13690Question →

An electronics manufacturer in Tokyo contracts to export microchips to a merchant in Nigeria. To eliminate the commercial default risk of the buyer as well as foreign exchange transfer risks associated with the buyer's overseas bank, the seller requires a commercial bank in Japan to add its own binding payment guarantee upon presentation of compliant trade documents. Which payment instrument fulfills this requirement?

Confirmed Irrevocable Letter of Credit

Bill of Lading

Unconfirmed Irrevocable Letter of Credit

Documentary Collection under Documents Against Acceptance

Show answer & explanation

Answer: Confirmed Irrevocable Letter of Credit

Answer

Confirmed Irrevocable Letter of Credit

A Confirmed Irrevocable Letter of Credit provides maximum protection for an exporter because a bank in the exporter's country adds its own legal undertaking to guarantee payment upon submission of compliant documents, thereby removing buyer default and foreign issuing bank risk.

Step-by-Step Solution

Analyze the financial protection required by the seller

The seller demands payment security backed not only by the buyer's bank, but also by an independent financial institution in the seller's home country (Japan).

Adding a local bank's commitment protects the exporter against foreign bank failure, credit default, and sovereign transfer restrictions.

Identify the corresponding instrument in foreign trade

A Confirmed Irrevocable Letter of Credit involves a confirming bank giving its explicit, uncancelable commitment to honor compliant documents.

Confirmation adds an additional layer of financial security on top of an irrevocable letter of credit.

Key Concept

Confirmed Irrevocable Letter of Credit in foreign trade

Estimated Time:1m 0s

Question 13691Question →

A government-owned port authority underwent structural reorganization where statutory treasury subventions were completely withdrawn, requiring the enterprise to set competitive tariffs, cover all operating expenses, and generate surplus revenue while retaining full state ownership. Which public enterprise reform policy is demonstrated in this scenario?

Privatization

Commercialization

Deregulation

Nationalization

Show answer & explanation

Answer: Commercialization

Answer

Commercialization

Commercialization involves restructuring state-owned enterprises so they operate as profit-making business entities, making them self-funding while government retains complete ownership.

Step-by-Step Solution

Analyze the ownership structure described in the scenario.

The government retains 100% ownership of the port authority.

Ownership status distinguishes privatization (sale of equity) from commercialization (retained public ownership).

Analyze the operational changes described.

Treasury subsidies are removed, and the enterprise must run at a profit.

Commercialization forces public entities to adopt commercial principles, set cost-reflective prices, and achieve self-financial sustainability without relying on state grants.

Key Concept

Commercialization of Public Enterprises

Question 13692Question →

Which of the following primary functions distinguishes the Bank of Agriculture (BOA) from commercial banks in Nigeria?

Providing long-term concessionary loans tailored specifically to farming and agricultural development projects

Regulating the nationwide money supply and controlling inflation through open market operations

Issuing short-term money market instruments to generate demand deposits for daily commercial trade

Restructuring unprofitable state-owned enterprises to operate for profit while retaining state equity

Show answer & explanation

Answer: Providing long-term concessionary loans tailored specifically to farming and agricultural development projects

Answer

Providing long-term concessionary loans tailored specifically to farming and agricultural development projects.

Specialized development banks such as the Bank of Agriculture (BOA) were established to channel long-term credit and technical assistance at concessionary (low) interest rates into critical sectors like agriculture, where commercial banks are traditionally reluctant to lend due to high risk and long gestation periods.

Step-by-Step Solution

Identify the primary role of specialized development banks like the Bank of Agriculture (BOA).

Development banks focus on key sectors of the economy by providing long-term loans at low (concessionary) interest rates.

Commercial banks prefer short- to medium-term lending at commercial interest rates, whereas sector development requires long-term capital financing.

Differentiate BOA's functions from Central Bank and Commercial Bank operations.

BOA does not issue monetary control policy (CBN role) nor does it rely on creating short-term demand deposits (commercial bank role).

Specialized development banks operate under specific statutory mandates to foster sector growth rather than retail deposit expansion or central regulatory control.

Key Concept

Role and Mandates of Specialized and Development Banks

Question 13693Question →

A high-altitude weather research probe contains $0.030\text{ m}^3$ of helium gas at a pressure of $1.00 \times 10^5\text{ Pa}$ and a temperature of $27^\circ\text{C}$ at ground level. During ascent, the gas expands to a volume of $0.050\text{ m}^3$ while its temperature rises to $127^\circ\text{C}$ . Assuming the helium behaves as an ideal gas, what is the new pressure of the gas in the probe?

4.50 \times 10^4\text{ Pa}

8.00 \times 10^4\text{ Pa}

2.22 \times 10^5\text{ Pa}

2.82 \times 10^5\text{ Pa}

Show answer & explanation

Answer: $8.00 \times 10^4\text{ Pa}$

Answer

The new pressure of the helium gas is

8.00 \times 10^4\text{ Pa}

Converting temperatures to absolute scale gives

T_1 = 300\text{ K}

and

T_2 = 400\text{ K}

. Rearranging the combined gas equation

\frac{P_1 V_1}{T_1} = \frac{P_2 V_2}{T_2}

for final pressure

P_2

yields

P_2 = 1.00 \times 10^5 \times \frac{0.030}{0.050} \times \frac{400}{300} = 8.00 \times 10^4\text{ Pa}

Step-by-Step Solution

Convert temperatures from Celsius to Kelvin

T_1 = 27 + 273 = 300\text{ K}

and

T_2 = 127 + 273 = 400\text{ K}

Gas laws require absolute temperature in Kelvin to maintain proportional thermodynamic relationships.

Apply the combined gas law formula

\frac{P_1 V_1}{T_1} = \frac{P_2 V_2}{T_2} \implies P_2 = P_1 \times \frac{V_1}{V_2} \times \frac{T_2}{T_1}

Mass of the gas is constant while pressure, volume, and temperature all change simultaneously.

Substitute given values and calculate final pressure

P_2 = 1.00 \times 10^5 \times \frac{0.030}{0.050} \times \frac{400}{300} = 8.00 \times 10^4\text{ Pa}

Multiplying initial pressure by the volume contraction ratio (

0.60

) and temperature expansion ratio (

1.333

) gives the new pressure.

Key Concept

Combined Gas Law

Question 13694Question →

Match each Nigerian energy generating facility or mineral deposit site on the left with its corresponding primary resource feature and location on the right.

Click a left item, then click its matching right item

Show answer & explanation

Answer

Kainji Station matches with Hydroelectric power generation on the River Niger in Niger State; Afam Station matches with Natural gas-fired thermal power generation in Rivers State; Riruwai Complex matches with Tin and columbite mineralization associated with Younger Granites in Kano State; Okaba Deposit Site matches with Sub-bituminous coal field exploitation in Kogi State.

Each energy plant and mineral deposit site is paired directly with its actual resource classification and geographical setting in Nigeria. Kainji provides hydroelectric power from the Niger River, Afam generates thermal electricity using Niger Delta natural gas in Rivers State, Riruwai hosts tin and columbite deposits in Younger Granites, and Okaba contains sub-bituminous coal reserves in Kogi State.

Step-by-Step Solution

Identify the energy mode and geographic location for Kainji and Afam power stations.

Kainji is a hydroelectric facility on the River Niger (Niger State), while Afam is a gas-fired thermal plant in Rivers State.

Differentiating between hydroelectric and thermal (gas) generation centers in Nigeria requires linking the power plant to its fuel source and state location.

Identify the mineral type and geological setting for Riruwai and Okaba.

Riruwai in Kano State yields tin and columbite from Younger Granites, whereas Okaba in Kogi State contains coal.

Solid minerals in Nigeria are distributed according to geological formations: tin/columbite on the Basement Complex/Younger Granites and coal within sedimentary basin belts.

Form the correct pairs matching each facility or deposit site to its descriptor.

Kainji pairs with River Niger HEP, Afam pairs with Rivers State natural gas thermal power, Riruwai pairs with Kano State tin/columbite, and Okaba pairs with Kogi State coal.

This establishes accurate location and resource association across Nigeria's energy and mineral sectors.

Key Concept

Spatial Distribution and Economic Classification of Mineral and Energy Resources in Nigeria

Question 13695Question →

Arranging climatic zones by their thermal characteristics provides key insights into African climate dynamics. Arrange the following African climatic zones in ascending order based on their mean annual temperature range, starting with the zone that exhibits the smallest annual temperature range and ending with the zone that exhibits the largest annual temperature range.

Drag items to arrange them in the correct order

Show answer & explanation

Answer

Equatorial (Tropical Rainforest) Zone → Tropical Savanna (Sudan) Zone → Mediterranean Zone → Tropical Desert (Sahara/Namib) Zone

The correct sequence arranges the climate zones from lowest annual temperature range to highest. The Equatorial Zone has the smallest range (

2^\circ\text{C}-3^\circ\text{C}

) due to constant insolation and cloudiness. The Tropical Savanna Zone has a slightly higher range (

5^\circ\text{C}-9^\circ\text{C}

) due to seasonal dry periods. The Mediterranean Zone experiences wider seasonal shifts (

10^\circ\text{C}-14^\circ\text{C}

) due to higher latitudes. The Tropical Desert Zone experiences the largest annual range (

15^\circ\text{C}-20^\circ\text{C}+

) due to hyper-aridity and cloudless skies.

Step-by-Step Solution

Analyze the thermal controls governing Equatorial regions.

Near the equator, uniform day length and high moisture yield an annual temperature range of only

2^\circ\text{C} - 3^\circ\text{C}

, placing the Equatorial Zone first.

Cloud cover and high humidity prevent extreme seasonal temperature variations.

Evaluate the seasonal temperature variations in the Tropical Savanna Zone.

Alternating wet and dry seasons yield an annual temperature range of roughly

5^\circ\text{C} - 9^\circ\text{C}

, placing it second.

Clear skies during the dry season increase solar radiation compared to the humid equatorial belt.

Assess thermal conditions in the Mediterranean climate regions.

Higher latitude location leads to distinct winter and summer thermal regimes with an annual temperature range of

10^\circ\text{C} - 14^\circ\text{C}

, placing it third.

Subtropical location introduces marked seasonal differences in solar elevation.

Examine extreme temperature ranges in continental dry climates.

Extremely dry air and cloudless conditions in the Tropical Desert Zone lead to strong diurnal and seasonal radiative losses, yielding the largest annual temperature range (

15^\circ\text{C} - 20^\circ\text{C}+

), placing it last.

Lack of moisture and vegetation allows maximum surface heating during summer and rapid radiational cooling during winter.

Key Concept

Annual temperature range across African climate zones increases away from humid equatorial latitudes toward dry continental desert regions.

Question 13696Question →

A rocket carries a payload of mass $25\text{ kg}$ resting on a spring balance. During its vertical ascent, the spring balance indicates a reading of $350\text{ N}$ . Taking the acceleration due to gravity as $g = 10\text{ m s}^{-2}$ , what is the magnitude of the upward acceleration of the rocket in $\text{m s}^{-2}$ ?

Show answer & explanation

Answer: 4

Answer

The upward acceleration of the rocket is

4.0\text{ m s}^{-2}

When an object of mass

m

accelerates upward at rate

a

, the scale must exert an upward force

R

that overcomes the weight

mg

and provides net acceleration

ma

, such that

R = m(g + a)

. Substituting

R = 350\text{ N}

m = 25\text{ kg}

, and

g = 10\text{ m s}^{-2}

yields

350 = 25(10 + a)

, which simplifies to

a = 4.0\text{ m s}^{-2}

Step-by-Step Solution

Formulate the equation of motion for apparent weight during upward acceleration

R - mg = ma \implies R = m(g + a)

The spring balance supports the mass against gravity while simultaneously providing the force for upward acceleration.

Substitute the given numerical parameters into the relation

350 = 25(10 + a)

The measured reading

R = 350\text{ N}

, mass

m = 25\text{ kg}

, and standard gravity

g = 10\text{ m s}^{-2}

are supplied.

Solve the algebraic equation for the rocket's acceleration

a

a = 4.0\text{ m s}^{-2}

Dividing

350\text{ N}

25\text{ kg}

gives an effective total acceleration of

14\text{ m s}^{-2}

; subtracting

g = 10\text{ m s}^{-2}

isolates the upward acceleration

a

Key Concept

Apparent Weight and Mass Measurement in Accelerating Frames

Question 13697Question →

Match each Environmental Impact Assessment (EIA) stage with its primary operational objective in environmental management.

Click a left item, then click its matching right item

Show answer & explanation

Answer

Scoping pairs with identifying key environmental issues and boundaries; Baseline Assessment pairs with documenting pre-project environmental conditions; Mitigation Planning pairs with formulating measures to prevent or reduce adverse impacts; and Environmental Auditing pairs with evaluating post-implementation performance and compliance.

Each EIA stage serves a unique functional role in environmental management: Scoping identifies key focus areas and boundaries; Baseline Assessment documents existing pre-project conditions; Mitigation Planning formulates actions to reduce or avoid negative impacts; and Environmental Auditing evaluates compliance during and after project implementation.

Step-by-Step Solution

Define the primary purpose of Scoping in the EIA process

Scoping identifies the key issues, temporal and spatial boundaries, and focus areas for the EIA report.

It ensures resources are directed toward evaluating significant potential impacts.

Define the role of Baseline Assessment

Baseline assessment gathers data on existing physical, biological, and socio-economic parameters prior to project commencement.

A baseline benchmark is required to accurately detect future project-induced environmental changes.

Define the objective of Mitigation Planning

Mitigation planning develops targeted actions to prevent, minimize, or remediate predicted environmental damage.

It converts impact predictions into actionable environmental protection plans.

Define the function of Environmental Auditing

Environmental auditing reviews post-project operations against environmental management plans and regulatory standards.

Auditing occurs post-construction to verify compliance and audit management effectiveness.

Key Concept

Procedural stages of Environmental Impact Assessment (EIA) and their specific functional objectives

Question 13698Question →

Match each type of public enterprise listed on the left with its defining legal and organizational characteristic on the right.

Click a left item, then click its matching right item

Show answer & explanation

Answer

Statutory Public Corporation matches establishment by a specific Act of Parliament for public welfare services; Government Department matches financing through treasury allocations and staffing by civil servants; State-Owned Commercial Company matches registration under company law operating for profit; Public Utility Board matches management of municipal infrastructure like water supply.

Statutory Public Corporations are created by special parliamentary acts with separate legal status. Government Departments are non-autonomous units managed directly by ministers and civil servants via treasury budgets. State-Owned Commercial Companies are incorporated under company law for profit making. Public Utility Boards cater to localized municipal services.

Step-by-Step Solution

Analyze the legal backing and primary purpose of statutory corporations versus government departments.

Statutory corporations owe their creation to a specific Act of Parliament, granting them corporate autonomy, whereas government departments operate directly under civil service rules and treasury funding.

Understanding the legislative origin distinguishes statutory bodies from civil service ministries.

Differentiate state commercial enterprises from utility boards.

Commercial companies are incorporated under general company law (CAMA) for profit, while utility boards are special local entities providing basic essential services.

Mode of incorporation and profit objective determine corporate structure.

Key Concept

Types and Characteristics of Public Enterprises

Question 13699Question →

Suppose a research expedition travels due north across the African continent along the 20°E meridian, starting from the Congo Basin near the Equator and terminating at the coast of North Africa. In what sequence will the expedition encounter these major vegetation zones from south to north?

Drag items to arrange them in the correct order

Show answer & explanation

Answer

The correct spatial sequence from south to north starting at the Equator is Tropical Rainforest, followed by Sudan Savanna, then Sahel Semi-Arid Scrub, and finally Mediterranean Woodland along the northern coast.

Traveling northward from the Equator (0°) toward North Africa, increasing distance from the Intertropical Convergence Zone causes rainfall to decrease and dry seasons to lengthen. This creates a distinct south-to-north latitudinal sequence: Tropical Rainforest, Sudan Savanna, Sahel Semi-Arid Scrub, and Mediterranean Woodland.

Step-by-Step Solution

Identify the Equatorial vegetation belt

Tropical Rainforest occupies the low-latitude humid region around the Equator (~0°).

High temperatures and heavy year-round rainfall in the Congo Basin support dense evergreen rainforest.

Trace the northward transition into savanna

Sudan Savanna lies north of the rainforest belt (~8°N to 12°N).

Decreasing annual rainfall and a seasonal dry period lead to open savanna woodland.

Identify the semi-arid desert border zone

Sahel Semi-Arid Scrub forms a narrow band (~12°N to 18°N) directly south of the Sahara Desert.

Low annual rainfall (~200–600 mm) supports only drought-resistant thorny acacias and sparse grasses.

Determine the northern coastal vegetation belt

Mediterranean Woodland covers the northernmost coast of North Africa (~30°N to 37°N).

Winter rainfall and dry summer conditions along the Mediterranean coast favor sclerophyllous shrubs and trees.

Key Concept

Latitudinal Zonation of African Vegetation Belts

Question 13700Question →

The ratification of regional free movement agreements in West Africa has led to an increased outflow of young, skilled professionals from agrarian communities to rapidly growing industrial hubs. Which of the following outcomes represents a direct demographic impact experienced by the source regions?

An increase in the age dependency ratio due to the loss of working-age population

The rapid expansion of nucleated settlement patterns across rural agricultural zones

A decline in the overall dependency ratio as remaining households become economically inactive

An influx of foreign labor seeking enhanced employment opportunities in rural farms

Show answer & explanation

Answer: An increase in the age dependency ratio due to the loss of working-age population

Answer

An increase in the age dependency ratio due to the loss of working-age population

When young, economically active adults emigrate from a source area, the remaining population disproportionately consists of children and the elderly. Because the dependency ratio is calculated by dividing the non-working dependent population by the working-age population, a reduction in working-age individuals increases the overall dependency ratio in the sending community.

Step-by-Step Solution

Identify the migration flow direction and demographic characteristics of the migrants.

The scenario describes out-migration (emigration) of young, economically active working-age individuals from rural source regions to industrial hubs.

Understanding who migrates is essential for determining demographic changes at the origin.

Analyze the impact of out-migration on the source region's population structure.

When working-age people leave, the proportions of elderly people and children relative to working adults increase.

Dependency ratio is defined as the dependent population (aged <15 and >64) divided by the working-age population (aged 15–64).

Determine the effect on the dependency ratio.

A smaller denominator (working-age group) results in a higher dependency ratio in the source area.

This directly matches the core demographic consequence of selective out-migration.

Key Concept

Impact of selective out-migration on source area dependency ratios

Estimated Time:1m 30s

PreviousPage 685 / 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