Tüm alıştırma soruları

13931 soru

Soru 5261Soru

During the laboratory preparation of dry hydrogen chloride gas, concentrated tetraoxosulfate(VI) acid (H2SO4\text{H}_2\text{SO}_4) is used as the drying agent rather than quicklime (CaO\text{CaO}). Which of the following explains why quicklime cannot be used to dry hydrogen chloride gas?

Cevabı ve açıklamayı göster

Cevap: Quicklime is a basic oxide that chemically reacts with acidic hydrogen chloride gas to form calcium chloride and water.

Cevap

Quicklime is a basic oxide that chemically reacts with acidic hydrogen chloride gas to form calcium chloride and water.
Drying agents must not react chemically with the gas being dried. Because hydrogen chloride (HCl\text{HCl}) is an acidic gas and quicklime (CaO\text{CaO}) is a basic oxide, they undergo a neutralization reaction forming calcium chloride and water. Concentrated tetraoxosulfate(VI) acid (H2SO4\text{H}_2\text{SO}_4) is acidic and does not react with HCl\text{HCl}, making it the correct drying agent.

Adım Adım Çözüm

1
Identify the chemical nature of hydrogen chloride gas.
Hydrogen chloride (HCl\text{HCl}) is an acidic gas.
It dissolves in water to form hydrochloric acid and reacts readily with bases.
2
Identify the chemical nature of quicklime (CaO\text{CaO}).
Calcium oxide (CaO\text{CaO}) is a basic oxide.
Group 2 metal oxides are basic oxides.
3
Determine the interaction between an acidic gas and a basic drying agent.
They undergo an acid-base neutralization reaction: CaO(s)+2HCl(g)CaCl2(s)+H2O(l)\text{CaO(s)} + 2\text{HCl(g)} \rightarrow \text{CaCl}_2\text{(s)} + \text{H}_2\text{O(l)}.
A drying agent must be chemically unreactive towards the gas being dried.

Anahtar Kavram

Chemical compatibility of drying agents with gases
Tahmini Süre:1m 0s
Soru 5262Soru

A bakery operating in the short run incurs a Total Fixed Cost (TFC) of 1,200\text{₦}1,200. When output is 66 loaves of bread, the bakery's Total Cost (TC) is 3,000\text{₦}3,000. When output increases to 77 loaves, its Total Variable Cost (TVC) becomes 2,240\text{₦}2,240. What is the Marginal Cost (MC) of producing the 7th7\text{th} loaf?

Cevabı ve açıklamayı göster

Cevap: 440\text{₦}440

Cevap

The Marginal Cost of producing the 7th loaf is 440\text{₦}440.
At an output level of 66 loaves, Total Variable Cost is TC6TFC=3,0001,200=1,800TC_6 - TFC = \text{₦}3,000 - \text{₦}1,200 = \text{₦}1,800. At 77 loaves, Total Cost is TFC+TVC7=1,200+2,240=3,440TFC + TVC_7 = \text{₦}1,200 + \text{₦}2,240 = \text{₦}3,440. The Marginal Cost of the 7th7\text{th} unit is the change in Total Cost (3,4403,000=4403,440 - 3,000 = \text{₦}440).

Adım Adım Çözüm

1
Calculate Total Variable Cost at 6 units of output
TVC6=TC6TFC=3,0001,200=1,800TVC_6 = TC_6 - TFC = \text{₦}3,000 - \text{₦}1,200 = \text{₦}1,800
Total cost is the sum of total fixed cost and total variable cost (TC=TFC+TVCTC = TFC + TVC).
2
Calculate Total Cost at 7 units of output
TC7=TFC+TVC7=1,200+2,240=3,440TC_7 = TFC + TVC_7 = \text{₦}1,200 + \text{₦}2,240 = \text{₦}3,440
Fixed cost remains constant at 1,200\text{₦}1,200 in the short run.
3
Calculate Marginal Cost of the 7th unit
MC7=TC7TC6=3,4403,000=440MC_7 = TC_7 - TC_6 = \text{₦}3,440 - \text{₦}3,000 = \text{₦}440
Marginal cost is the addition to total cost resulting from producing one additional unit of output (MC=ΔTC/ΔQMC = \Delta TC / \Delta Q).

Anahtar Kavram

Short-Run Marginal Cost and Total Cost Derivations
Soru 5263Soru

Arrange the following stages of W.W. Rostow's economic growth model in their correct sequential order, starting from the earliest historical stage to the most advanced stage.

Öğeleri doğru sıraya koymak için sürükleyin

Cevabı ve açıklamayı göster

Cevap

The correct sequence of Rostow's stages of economic growth from earliest to most advanced is: The Traditional Society, The Pre-conditions for Take-off, The Take-off, The Drive to Maturity, and The Age of High Mass Consumption.
W.W. Rostow's historical model of economic growth posits that societies progress through five distinct economic stages in sequential order: starting with The Traditional Society (primitive/subsistence), moving into The Pre-conditions for Take-off (infrastructure building), transitioning through The Take-off (rapid growth and investment focus), continuing through The Drive to Maturity (broad technological spread), and reaching ultimate maturity in The Age of High Mass Consumption (high per capita income and mass consumer goods).

Adım Adım Çözüm

1
Identify the base stage characterized by low productivity and agricultural focus
The Traditional Society is identified as position 1.
Economic development begins from a baseline of traditional, technology-limited societal production.
2
Determine the transitional preparation phase
The Pre-conditions for Take-off is identified as position 2.
An economy must establish infrastructure and agricultural surpluses before rapid industrialization can occur.
3
Locate the structural breakthrough phase
The Take-off is identified as position 3.
This phase represents the short period of intensive growth where leading economic sectors transform society.
4
Identify the period of economic diversification and technological diffusion
The Drive to Maturity is identified as position 4.
Following initial growth, modern techniques spread throughout all economic branches over several decades.
5
Pinpoint the final high-income, consumer-oriented phase
The Age of High Mass Consumption is identified as position 5.
Economies culminate in widespread consumer welfare, durable goods consumption, and expanded service sectors.

Anahtar Kavram

Rostow's Stages of Economic Growth Model
Tahmini Süre:1m 0s
Soru 5264Soru

Tea and coffee are substitute goods in competitive demand. If the price of coffee rises significantly while the price of tea remains unchanged, which of the following market changes will occur for tea?

Cevabı ve açıklamayı göster

Cevap: A rightward shift in the demand curve for tea

Cevap

A rightward shift in the demand curve for tea
Tea and coffee are substitutes in competitive demand. When the price of coffee increases while the price of tea remains constant, tea becomes relatively less expensive. Consumers reallocate their purchases from coffee to tea, increasing total market demand for tea at every price level. This non-price factor causes an outward (rightward) shift of the demand curve for tea.

Adım Adım Çözüm

1
Identify the economic relationship between the two goods
Tea and coffee are substitute goods in competitive demand.
They satisfy similar consumer needs and serve as alternative choices.
2
Analyze consumer behavior following the price change of coffee
The increase in coffee price causes consumers to demand more tea at existing prices.
Consumers substitute away from the relatively more expensive good (coffee) toward the relatively cheaper alternative (tea).
3
Determine the graphical impact on the demand curve for tea
The entire demand curve for tea shifts outward to the right.
A change in the price of a substitute good is a non-price determinant of demand for tea, causing a shift in the entire demand curve rather than a movement along the curve.

Anahtar Kavram

Determinants of Demand: Prices of Substitute Goods
Tahmini Süre:1m 0s
Soru 5265Soru

Match each seed germination structure or growth process on the left with its corresponding role during seedling development on the right.

Soldaki öğeye tıklayın, sonra eşleşen sağdaki öğeye tıklayın

Öğeler

Hypocotyl elongation in epigeal germination
Epicotyl elongation in hypogeal germination
Coleoptile emergence in monocot seedlings
Radicle emergence through the micropyle

Eşleşmeler

Cevabı ve açıklamayı göster

Cevap

Hypocotyl elongation in epigeal germination pairs with pushing cotyledons above the soil surface. Epicotyl elongation in hypogeal germination pairs with keeping cotyledons below ground while pushing the shoot upward. Coleoptile emergence pairs with forming a protective sheath around the shoot tip during soil penetration. Radicle emergence pairs with anchoring the seedling and forming the primary root system.
Each plant developmental structure performs a distinct physiological role during germination: hypocotyl growth elevates cotyledons above ground in epigeal species; epicotyl growth keeps cotyledons underground in hypogeal species; the coleoptile protects the delicate young shoot tip in monocots; and the radicle emerges first to establish the primary root system.

Adım Adım Çözüm

1
Differentiate between epigeal and hypogeal germination mechanisms.
Epigeal germination involves hypocotyl growth lifting cotyledons above ground, whereas hypogeal germination involves epicotyl growth leaving cotyledons below ground.
The region of rapid cellular division and elongation determines whether cotyledons are elevated or remain buried.
2
Identify the specialized protective role of the coleoptile in monocot development.
The coleoptile acts as a pointed sheath guarding fragile plumule tissues from abrasive soil particles during upward growth.
Monocot shoots require specialized structural protection during soil emergence.
3
Determine the sequence and role of embryonic root emergence.
The radicle exits first through the micropyle to secure anchorage and absorb water prior to shoot development.
Early root establishment is essential to supply hydration required for metabolic processes and growth.

Anahtar Kavram

Plant Seed Germination Types and Early Embryonic Growth Patterns
Soru 5266Soru

A state tax board issues a public notice declaring that all business operators will be informed of their precise tax liabilities, payment deadlines, and calculation formulas six months prior to collection. Which canon of taxation is the government primarily implementing through this measure?

Cevabı ve açıklamayı göster

Cevap: The canon of certainty

Cevap

The canon of certainty is being implemented because the tax authority ensures that the tax amount, calculation method, and payment deadline are clear and known in advance to taxpayers.
According to Adam Smith, the canon of certainty dictates that the tax a citizen pays should be clear, non-arbitrary, and known beforehand—including the exact amount, time, and manner of payment. Providing clear formulas and advance deadlines directly fulfills this principle.

Adım Adım Çözüm

1
Analyze the tax authority's action described in the scenario.
The action focuses on publishing precise tax liabilities, payment deadlines, and formulas in advance.
Identifying the core goal of the policy helps determine which tax principle is being satisfied.
2
Match the core policy goal to Adam Smith's canons of taxation.
Providing transparent, clear, and unambiguous details about tax obligations satisfies the canon of certainty.
The canon of certainty emphasizes that tax obligations must not be arbitrary, but clear to both taxpayer and collector.

Anahtar Kavram

Canon of Certainty
Tahmini Süre:1m 0s
Soru 5267Soru

Under the French colonial administration in West Africa, why were the vast majority of Africans living outside the Four Communes of Senegal designated as sujets (subjects) rather than citoyens (citizens)?

Cevabı ve açıklamayı göster

Cevap: They failed to meet the rigorous criteria of cultural assimilation, literacy in French, and legal renunciation of indigenous customs.

Cevap

The vast majority of Africans were designated as subjects because they did not satisfy the stringent educational, cultural, and legal criteria required to renounce local customary laws and fully assimilate into French civilization.
Under the French policy of Assimilation, full French citizenship required total cultural integration, including mastery of the French language, adherence to French civil law, and explicit legal abandonment of indigenous customs and religious legal systems. Because these requirements were intentionally stringent and culturally unpalatable to most Africans, only a tiny elite outside the Four Communes (Saint-Louis, Gorée, Dakar, and Rufisque) attained citizenship, leaving the vast majority classified as subjects governed by the punitive Indigénat code.

Adım Adım Çözüm

1
Analyze the legal distinction between citoyens (citizens) and sujets (subjects) in French West Africa.
Citizenship conferred full legal rights under French civil law, whereas subjects were ruled by arbitrary administrative regulations under the Indigénat code.
Distinguishing these two statuses reveals how restrictive French citizenship criteria were for colonised populations.
2
Examine the statutory requirements for an African to acquire French citizenship outside the Four Communes.
Applicants were required to prove fluency in French, show evidence of good character and devotion to France, and legally relinquish local Islamic or customary laws.
These strict cultural requirements created intentional barriers, leaving over 90 percent of Africans in the category of subjects.

Anahtar Kavram

French Policy of Assimilation: Legal Distinction between Citoyens and Sujets
Soru 5268Soru

In a democratic political system, supreme political power ultimately resides in the citizens, who exercise their collective will through periodic elections to establish, guide, and hold government authority accountable. Which core pillar of democracy does this statement describe?

Cevabı ve açıklamayı göster

Cevap: Popular sovereignty

Cevap

Popular sovereignty
Popular sovereignty is the democratic doctrine asserting that government legitimacy and ultimate power derive entirely from the consent and political power of the governed (the citizenry).

Adım Adım Çözüm

1
Analyze the core concept described in the question stem.
The stem describes the supreme political power held by citizens to choose political leaders and sanction public policies in a democracy.
Identifying the source of ultimate political authority is key to determining the correct democratic principle.
2
Distinguish popular sovereignty from other types of sovereignty and institutional mechanisms.
Popular sovereignty explicitly locates ultimate authority in the citizenry/electorate, whereas legal sovereignty rests with the law-making legislature.
JAMB UTME frequently tests the distinction between the electorate's ultimate political mandate and constitutional/institutional bodies.

Anahtar Kavram

Popular Sovereignty in Democracy
Tahmini Süre:1m 0s
Soru 5269Soru

A man with blood group A, whose mother had blood group O, marries a woman with blood group B, whose father had blood group O. What is the probability that their first child will have blood group O?

Cevabı ve açıklamayı göster

Cevap: 25%

Cevap

The probability that their first child will have blood group O is 25%.
Both parents inherited a recessive allele ii from their respective blood group O parents, giving them heterozygous genotypes (IAiI^A i and IBiI^B i). Crossing these genotypes produces four offspring genotypes (IAIBI^A I^B, IAiI^A i, IBiI^B i, iiii) in equal proportions, resulting in a 25% (1 in 4) chance for a child with blood group O (iiii).

Adım Adım Çözüm

1
Determine parental genotypes from their phenotypes and family histories.
The man has blood group A (IAIAI^A I^A or IAiI^A i). Because his mother was blood group O (iiii), he inherited an ii allele, giving him genotype IAiI^A i. The woman has blood group B (IBIBI^B I^B or IBiI^B i) and her father was blood group O (iiii), giving her genotype IBiI^B i.
An individual with blood group O has genotype iiii and must pass a recessive ii allele to all offspring.
2
Perform a genetic cross between the two parents (IAi×IBiI^A i \times I^B i).
The offspring genotypes formed are IAIBI^A I^B (blood group AB), IAiI^A i (blood group A), IBiI^B i (blood group B), and iiii (blood group O) in a 1:1:1:1 ratio.
Punnett square analysis of two heterozygous individuals yields four equally likely genotype combinations.
3
Calculate the probability of obtaining genotype iiii (blood group O).
1 out of 4 possible outcomes is genotype iiii, which equals 25% or 14\frac{1}{4}.
Blood group O is expressed only when the homozygous recessive genotype iiii is present.

Anahtar Kavram

Multiple Alleles and Codominance in ABO Blood Group Inheritance
Tahmini Süre:1m 30s
Soru 5270Soru

In the pre-colonial Igbo political system, major policy decisions affecting the entire community were rendered binding through which of the following mechanisms?

Cevabı ve açıklamayı göster

Cevap: Reaching consensus through open debate and consultation in the village assembly (Oha-na-eze)

Cevap

Reaching consensus through open debate and consultation in the village assembly (Oha-na-eze)
Pre-colonial Igbo governance was acephalous (stateless) and highly democratic. Important community decisions required public deliberation and consensus building within the village assembly (Oha-na-eze) and council of elders (Ama-ala), ensuring all component segments had a voice.

Adım Adım Çözüm

1
Identify the key organizational feature of pre-colonial Igbo political structure.
The pre-colonial Igbo possessed a decentralized or acephalous political structure characterized by direct village democracy.
Power was diffused across lineages rather than concentrated in a single sovereign or monarch.
2
Analyze how collective decision-making was conducted within village governance.
The village assembly (Oha-na-eze), comprising title holders, lineage heads (Ama-ala), age grades, and citizens, debated matters publicly until consensus was achieved.
Consensus ensured political stability and legitimacy in a non-centralized society.

Anahtar Kavram

Igbo Acephalous Political Structure and Village Assembly Democracy
Tahmini Süre:1m 0s
Soru 5271Soru

A West African country records a general price level (PP) of N250\text{N}250 per transaction unit and a total volume of physical transactions (TT) of 800,000800,000 units per year. If the velocity of money circulation (VV) is 55, calculate the required total money supply (MM), in millions of naira, according to Fisher's Quantity Theory of Money equation (MV=PTMV = PT).

Cevabı ve açıklamayı göster

Cevap: 40

Cevap

The total money supply (MM) required is 40 million naira.
According to Irving Fisher's Quantity Theory of Money, MV=PTMV = PT. Substituting V=5V = 5, P=250P = 250, and T=800,000T = 800,000 gives 5M=200,000,0005M = 200,000,000. Dividing both sides by 55 yields M=40,000,000M = 40,000,000 naira. Converting to millions of naira gives 40.

Adım Adım Çözüm

1
Identify the given variables from the context.
P=250P = 250, T=800,000T = 800,000, V=5V = 5.
These are the parameter inputs required for Fisher's Equation of Exchange.
2
Apply Fisher's Quantity Theory of Money formula.
MV=PTMV = PT
This formula establishes the macroeconomic equilibrium between monetary flow and total transaction value.
3
Substitute the values and solve for MM.
5M=250×800,000    5M=200,000,000    M=40,000,000 naira5M = 250 \times 800,000 \implies 5M = 200,000,000 \implies M = 40,000,000\text{ naira}.
Dividing the total transaction expenditure by velocity isolates the money stock.
4
Express the money supply in millions of naira.
40 million naira40\text{ million naira}.
The unit requested in the question stem is millions of naira.

Anahtar Kavram

Fisher's Quantity Theory of Money (Equation of Exchange MV=PTMV = PT)
Tahmini Süre:1m 30s
Soru 5272Soru

A State House of Assembly in Nigeria passed a statute imposing criminal penalties on citizens who criticize state executive policies. A legal practitioner challenged the law at the High Court, asserting that it violates express provisions on fundamental rights under the 1999 Constitution. Upon examination, the court declared the statute unconstitutional, null, and void. Which judicial function or power is directly demonstrated in this court ruling?

Cevabı ve açıklamayı göster

Cevap: Judicial review

Cevap

Judicial review
The correct answer is judicial review because it represents the power of the courts of law to interpret the constitution and declare invalid any legislative act or executive order that runs contrary to constitutional provisions.

Adım Adım Çözüm

1
Analyze the legal scenario presented in the stem.
A court is evaluating a statute passed by a legislative body against constitutional provisions.
Identifying the subject of the legal dispute determines which constitutional doctrine applies.
2
Distinguish between court jurisdictions and powers of constitutional control.
Nullifying a legislative act for violating constitutional fundamental rights is the core mechanism of judicial oversight of legislation.
Appellate jurisdiction reviews lower court decisions, while evaluating the constitutionality of acts of parliament or assemblies is judicial review.
3
Select the option describing the constitutional power to declare unconstitutional laws null and void.
Judicial review is the correct judicial power.
The principle of constitutional supremacy empowers the judiciary to declare legislative acts void to the extent of their inconsistency with the constitution.

Anahtar Kavram

Judicial Review and Constitutional Supremacy
Soru 5273Soru

Match each category of citizenship, fundamental right, or civic requirement under the Nigerian Constitution with its correct defining provision or legal condition.

Soldaki öğeye tıklayın, sonra eşleşen sağdaki öğeye tıklayın

Öğeler

Citizenship by Registration
Fundamental Human Rights
Civic Duties and Obligations
Citizenship by Naturalization

Eşleşmeler

Cevabı ve açıklamayı göster

Cevap

Citizenship by Registration pairs with the provision for foreign women married to Nigerians or persons with Nigerian grandparents; Fundamental Human Rights pairs with enforceable entitlements under Chapter IV; Civic Duties and Obligations pairs with constitutional obligations under Section 24 such as tax payment; Citizenship by Naturalization pairs with the 15-year continuous residence requirement for foreign applicants.
Under the 1999 Constitution of Nigeria, Citizenship by Registration applies to specific categories such as foreign wives of Nigerian citizens (Section 26), whereas Citizenship by Naturalization demands strict long-term residency of 15 years and character qualifications (Section 27). Fundamental Human Rights are individual legal protections codified in Chapter IV, while Civic Duties represent non-negotiable obligations expected from citizens to support effective governance under Section 24.

Adım Adım Çözüm

1
Examine the constitutional rules for Citizenship by Registration.
Identify that Section 26 specifically covers non-Nigerian women married to Nigerian men and individuals with ancestral ties.
This sets registration apart from naturalization based strictly on residency duration.
2
Distinguish between Chapter IV rights and Section 24 duties.
Rights are enforceable entitlements guaranteed to individuals (e.g. fair hearing, personal liberty), whereas duties are mandatory responsibilities owed by citizens to the state (e.g. tax compliance).
Prevents conflation of civic obligations with fundamental freedoms.
3
Analyze the conditions for Citizenship by Naturalization.
Confirm that naturalization requires strict qualifications including 15 years continuous residence and assimilation into the community.
Ensures accurate matching with the statutory 15-year residency requirement.

Anahtar Kavram

Constitutional classification of citizenship modes, fundamental rights, and civic obligations under the 1999 Constitution of Nigeria.
Soru 5274Soru

To implement the Indirect Rule system in the decentralized, acephalous societies of Eastern Nigeria, the British colonial administration artificially created and appointed local sole executive authorities known as which of the following?

Cevabı ve açıklamayı göster

Cevap: Warrant Chiefs

Cevap

The artificial local political authorities created by the British to enforce Indirect Rule in Eastern Nigeria were called Warrant Chiefs.
In pre-colonial Eastern Nigeria, societies were acephalous (stateless) and governed through consensus, village assemblies, and title societies rather than powerful monarchs. To operate Indirect Rule, the British government artificially created sole executive administrators by issuing official warrants to selected individuals, calling them Warrant Chiefs.

Adım Adım Çözüm

1
Identify the pre-colonial political structure of Eastern Nigeria.
Eastern Nigeria (largely Igbo communities) operated a decentralized, acephalous political system without paramount kings or centralized rulers.
Indirect Rule required local traditional rulers to act as intermediaries between the British officers and the populace.
2
Determine the colonial solution used by the British to impose Indirect Rule.
The British issued executive warrants to arbitrarily selected individuals, creating the institution of Warrant Chiefs.
Because traditional centralized rulers did not exist, administrative authorities had to be artificially created.

Anahtar Kavram

Warrant Chief System in Eastern Nigeria
Tahmini Süre:45s
Soru 5275Soru

Match each constitutional mechanism of judicial independence on the left with its correct protective function on the right.

Soldaki öğeye tıklayın, sonra eşleşen sağdaki öğeye tıklayın

Öğeler

Security of Tenure
Consolidated Revenue Fund Salary Provision
Power of Judicial Review

Eşleşmeler

Cevabı ve açıklamayı göster

Cevap

Security of Tenure matches with protection against arbitrary dismissal; Consolidated Revenue Fund Salary Provision matches with financial autonomy independent of political approval; Power of Judicial Review matches with empowering courts to nullify unconstitutional acts.
Security of tenure protects judges from arbitrary dismissal, charging salaries to the Consolidated Revenue Fund guarantees financial independence from political bodies, and judicial review allows the judiciary to invalidate ultra vires actions, ensuring the enforcement of the rule of law.

Adım Adım Çözüm

1
Analyze 'Security of Tenure'
Identified as a legal guarantee preventing executive officers from arbitrarily sacking judges before statutory retirement.
Judges require job security to deliver impartial judgments without fear of executive backlash.
2
Analyze 'Consolidated Revenue Fund Salary Provision'
Identified as financial protection where judicial salaries are paid directly from the central revenue pool.
If judicial salaries depended on annual legislative votes, politicians could use financial pressure to influence court rulings.
3
Analyze 'Power of Judicial Review'
Identified as the authority of courts to examine and strike down ultra vires acts.
This mechanism ensures that all organs of government remain subject to the supreme law of the land.

Anahtar Kavram

Safeguards for Judicial Independence and Enforcement of the Rule of Law
Soru 5276Soru

Match each noble gas listed on the left with its corresponding primary industrial application or physical property on the right.

Soldaki öğeye tıklayın, sonra eşleşen sağdaki öğeye tıklayın

Öğeler

Helium (HeHe)
Neon (NeNe)
Argon (ArAr)
Krypton (KrKr)

Eşleşmeler

Cevabı ve açıklamayı göster

Cevap

Helium corresponds to filling weather balloons; Neon corresponds to reddish-orange advertising discharge tubes; Argon corresponds to an inert gas shield during electric arc welding; Krypton corresponds to high-intensity airport runway lamps.
Helium is chosen for balloons because it is light and non-flammable. Neon produces a characteristic reddish-orange light when ionized in sign tubes. Argon is abundant and unreactive, ideal for protecting molten metals during arc welding. Krypton increases filament efficiency and brightness in specialized high-intensity beacons.

Adım Adım Çözüm

1
Evaluate the unique physical characteristics and electronic stability of each Group 18 element.
Helium has low density and 1s21s^2 duplet stability; Neon, Argon, and Krypton have complete ns2np6ns^2 np^6 octets with specific emission spectra and densities.
Specific industrial uses rely on unreactivity, density, optical emission, or thermal conductivity.
2
Correlate each gas to its technological application.
Helium \rightarrow weather balloons; Neon \rightarrow orange signboards; Argon \rightarrow arc welding shield; Krypton \rightarrow runway beacons.
Matching properties ensures optimal performance and safety in industrial contexts.

Anahtar Kavram

Noble gases possess full valence energy levels (1s21s^2 for HeHe, ns2np6ns^2 np^6 for others), making them chemically unreactive and suitable for specialized optical, atmospheric, and cryogenic applications.
Soru 5277Soru

During photosynthesis, light energy absorbed by chlorophyll drives essential chemical conversions within the thylakoid membranes of chloroplasts. Which of the following biological processes occurs specifically during this light-dependent stage?

Cevabı ve açıklamayı göster

Cevap: Photolysis of water yielding oxygen gas, protons, and high-energy energy carriers

Cevap

Photolysis of water yielding oxygen gas, protons, and high-energy energy carriers occurs specifically during the light-dependent stage.
The light-dependent stage of photosynthesis occurs in the thylakoid membranes of chloroplasts. Light energy absorbed by chlorophyll causes the photolysis of water (2H2O4H++4e+O22H_2O \rightarrow 4H^+ + 4e^- + O_2), releasing oxygen gas as a byproduct and generating ATP and reduced NADP (NADPH) required for the dark reaction.

Adım Adım Çözüm

1
Identify the biological site and primary events of the light-dependent stage of photosynthesis.
The light-dependent reactions occur within the thylakoid membranes of chloroplasts, initiated by light absorption by chlorophyll.
Photon absorption excites electrons to drive water splitting and energy carrier generation.
2
Distinguish between light-dependent reaction products and light-independent Calvin cycle steps.
Photolysis of water (2H2O4H++4e+O22H_2O \rightarrow 4H^+ + 4e^- + O_2) produces oxygen gas, ATPATP, and NADPHNADPH in thylakoids, whereas carbon fixation, reduction, and sugar synthesis occur in the stroma.
Light energy is directly required to split water molecules, whereas carbon fixation relies on chemical products in the stroma.

Anahtar Kavram

Light-dependent stage of photosynthesis and photolysis of water
Soru 5278Soru

A senior civil servant drafts detailed administrative guidelines for implementing a newly passed healthcare reform. When public debate and criticism arise regarding the implementation strategy, the political minister defends the policy publicly while the civil servant's identity is kept out of public view. Which characteristic of the civil service is best illustrated in this scenario?

Cevabı ve açıklamayı göster

Cevap: Anonymity

Cevap

Anonymity is the civil service principle demonstrated when ministers take public responsibility for policy actions while civil servants remain shielded from public praise or blame.
Anonymity is the doctrine under which civil servants perform their duties without receiving public praise or blame. The minister, as the political head, assumes ministerial responsibility and takes all public accountability.

Adım Adım Çözüm

1
Analyze the scenario details
The civil servant carries out official duties behind the scenes, while the political minister accepts public responsibility and defense of the policy.
Identifying who faces public scrutiny versus who remains undisclosed determines the specific civil service doctrine in effect.
2
Relate the scenario to civil service characteristics
The principle of anonymity dictates that civil servants are not publicly named or held accountable in parliament or the press; political ministers bear full responsibility for government administration.
This convention shields non-partisan career officials from political attacks and maintains administrative continuity.

Anahtar Kavram

The Principle of Anonymity in the Civil Service
Soru 5279Soru

Which fundamental constitutional feature distinguished the 1979 Constitution of Nigeria's Second Republic from the 1963 Republican Constitution?

Cevabı ve açıklamayı göster

Cevap: The establishment of an executive presidential system combining the roles of Head of State and Head of Government

Cevap

The 1979 Constitution introduced an executive presidential system where the President functions as both Head of State and Head of Government, replacing the Westminster parliamentary model of the First Republic.
The 1979 Presidential Constitution marked a major political shift in Nigeria by abandoning the British Westminster parliamentary model in favor of an American-style executive presidency. Under this system, the President was directly elected and combined the dual roles of ceremonial Head of State and chief executive Head of Government.

Adım Adım Çözüm

1
Identify the historical transition in Nigeria's governance framework between the First Republic (1963) and the Second Republic (1979).
Recognize that the Constitution Drafting Committee (CDC) and Constituent Assembly abandoned the parliamentary system.
The parliamentary system of the First Republic was perceived to have contributed to political instability due to split executive powers between a Prime Minister and a ceremonial President.
2
Determine the primary constitutional innovation implemented in the 1979 Constitution.
The 1979 Constitution adopted an executive presidency modeled largely after the United States system.
This unified executive authority in a single popularly elected President who serves as both Head of State and Head of Government.

Anahtar Kavram

Executive Presidential System of the 1979 Constitution
Soru 5280Soru

Match each non-Mendelian genetic concept listed on the left with its corresponding biological example or defining feature on the right.

Soldaki öğeye tıklayın, sonra eşleşen sağdaki öğeye tıklayın

Öğeler

Incomplete Dominance
Codominance
Multiple Alleles

Eşleşmeler

Cevabı ve açıklamayı göster

Cevap

Incomplete Dominance matches with pink flower color in snapdragons; Codominance matches with simultaneous expression of IAI^A and IBI^B antigens in AB blood group; Multiple Alleles matches with the existence of IAI^A, IBI^B, and ii gene variants in a population.
Matching Incomplete Dominance to pink snapdragons correctly identifies intermediate phenotypic blending. Matching Codominance to blood type AB correctly identifies joint expression of two functional alleles. Matching Multiple Alleles to the ABO gene locus (IAI^A, IBI^B, ii) correctly identifies gene loci that have more than two alternative allele variants within a population.

Adım Adım Çözüm

1
Analyze Incomplete Dominance
Incomplete dominance involves a blending of phenotypes in heterozygous offspring.
Crossing red and white homozygous snapdragons produces pink heterozygous offspring because the single functional dominant allele produces insufficient pigment for full red expression.
2
Analyze Codominance
Codominance involves full, distinct, non-blended phenotypic expression of both inherited alleles.
Heterozygotes carrying both IAI^A and IBI^B alleles produce both A and B glycoprotein antigens on red blood cell surfaces equally.
3
Analyze Multiple Alleles
Multiple alleles describes a population-level genetic phenomenon where a single locus has more than two allele options.
While any diploid individual inherits only two alleles, the human population possesses three distinct alleles (IAI^A, IBI^B, and ii) governing the ABO blood group locus.

Anahtar Kavram

Patterns of Non-Mendelian Inheritance (Incomplete Dominance, Codominance, Multiple Alleles)
ÖncekiSayfa 264 / 697Sonraki
Tüm alıştırma soruları — JAMB UTME | Examkin