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Chemistry QUESTION #7393

The correct order of electron gain enthalpy (with negative sign) for the atomic species F, Cl, O and S is:

$\text{F} < \text{Cl} < \text{O} < \text{S}$
$\text{S} < \text{O} < \text{Cl} < \text{F}$
$\text{O} < \text{S} < \text{F} < \text{Cl}$✔️
$\text{Cl} < \text{F} < \text{S} < \text{O}$

Correct Answer Logic:

Electron gain enthalpy trend:
O has lower EA than S (too small, high e⁻ repulsion). F has lower EA than Cl (same reason). Cl has the highest EA among these.

Correct order (increasing magnitude of negative EGE):
$\text{O} < \text{S} < \text{F} < \text{Cl}$

i.e., Cl releases most energy on gaining an electron.

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Paper-I (Anatomy/Physiology and Biochemistry/Microbiology) QUESTION #3473

Question 2302

'Essential Amino Acids' are those that:

The body can make itself
Must be supplied by the diet✔️
Are not needed
Are only in meat

Correct Answer Logic:

There are 9 essential amino acids for humans.

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Islamic Studies QUESTION #7621

Question 2303

عام الفیل (Year of the Elephant) کس نبیوی سال میں پیش آیا؟

8 نبوی✔️
9 نبوی
10 نبوی
11 نبوی

Correct Answer Logic:

عام الفیل 8 نبوی (570 عیسوی) میں پیش آیا، جس میں نبی کریم ﷺ کی پیدائش ہوئی۔

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Reading and Writing (Module-1) QUESTION #5404

Question 2304

Biologist Valentina Gómez-Bahamón and her team have investigated two subspecies of the fork-tailed flycatcher bird that live in the same region in Colombia, but one subspecies migrates south for part of the year, and the other doesn't. The researchers found that, due to slight differences in feather shape, the feathers of migratory forked-tailed flycatcher males make a sound during flight that is higher pitched than that made by the feathers of nonmigratory males. The researchers hypothesize that fork-tailed flycatcher females are attracted to the specific sound made by the males of their own subspecies, and that over time the females' preference will drive further genetic and anatomical divergence between the subspecies. Which finding, if true, would most directly support Gómez-Bahamón and her team's hypothesis?

The feathers located on the wings of the migratory fork-tailed flycatchers have a narrower shape than those of the nonmigratory birds which allows them to fly long distances.
Over several generations, the sound made by the feathers of migratory male fork-tailed flycatchers grows progressively higher pitched relative to that made by the feathers of nonmigratory males.✔️
Fork-tailed flycatchers communicate different messages to each other depending on whether their feathers create high-pitched or low-pitched sounds.
The breeding habits of the migratory and nonmigratory fork-tailed flycatchers remained generally the same over several generations.

Correct Answer Logic:

If the pitch difference increases over generations, it would support the hypothesis that female preference drives further divergence between the subspecies.

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General Knowledge QUESTION #11500

Question 2305

Who designed the Difference Engine and the Analytical Engine?

Vint Cerf
Mark Zuckerberg
Charles Babbage✔️
None of these

Correct Answer Logic:

Charles Babbage (1791–1871) designed both the Difference Engine (1822 — a mechanical calculator) and the Analytical Engine (1837 — a mechanical general-purpose computer). Ada Lovelace wrote programs for it. Vint Cerf co-invented TCP/IP; Mark Zuckerberg founded Facebook.

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General Knowledge QUESTION #11507

Question 2306

The structural organisation of items like Titles, Subtitles, images, and tables on a slide is called a:

Layout✔️
Presentation
Design
Scheme

Correct Answer Logic:

In MS PowerPoint, a Layout defines the arrangement of content placeholders (title, text, images, charts, tables) on a slide. PowerPoint offers multiple built-in layouts (Title Slide, Title and Content, Two Content, Blank, etc.) accessible via Home tab → Layout.

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Ability / HR / Governance / Special Education QUESTION #1795

Question 2307

According to Rule 19(1)(c), a bidder who fails to abide by a bid securing declaration — but without involvement in corrupt or fraudulent practices — shall be blacklisted and cross debarred for a maximum period of:

Six months✔️
One year
Two years
Three years

Correct Answer Logic:

Rule 19(1)(c) prescribes that a bidder who fails to honor a bid securing declaration, but is not found guilty of corrupt or fraudulent practices, shall be blacklisted and cross debarred for a period not exceeding six months.

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Agronomy QUESTION #2096

Question 2308

The nitrogen cycle in agricultural soils involves multiple transformation processes. Which sequence correctly represents the pathway of urea fertilizer nitrogen from soil application to crop uptake?

Urea → Denitrification → $N_2O$ → Plant uptake
Urea → Hydrolysis ($NH_4^+$ via urease) → Nitrification ($NO_3^-$ via Nitrosomonas/Nitrobacter) → Plant uptake or leaching/denitrification losses✔️
Urea → Direct uptake as intact molecule → Hydrolysis inside root cells
Urea → Volatilization as $NH_3$ → Redeposition → $NO_3^-$ formation → Plant uptake

Correct Answer Logic:

Urea undergoes rapid hydrolysis by the soil enzyme urease: $CO(NH_2)_2 + H_2O \rightarrow 2NH_3 + CO_2$, producing $NH_4^+$ in soil solution. Nitrification then converts $NH_4^+ \rightarrow NO_2^- \rightarrow NO_3^-$ (Nitrosomonas, Nitrobacter). $NO_3^-$ is mobile and plant-available but vulnerable to leaching and denitrification. This sequence explains why urease and nitrification inhibitors improve N efficiency.

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Business, Public administration and Policy QUESTION #10532

Question 2309

Among the following, which represents a key function of legislatures in a democratic system?

Providing a check on the power of the executive✔️
Ensuring laws are properly enforced by the state
Exercising the powers of the judiciary
None of these

Correct Answer Logic:

A core function of legislatures is oversight and checking executive power through: enacting laws that bind the executive, approving budgets, confirming appointments, holding hearings, and passing votes of no-confidence. Law enforcement is an executive function; law interpretation belongs to the judiciary. The legislature's oversight role is central to separation of powers and democratic accountability.

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Education QUESTION #10913

Question 2310

Educational evaluation is a process by which:

A teacher can assess his/her teaching
A student can assess his/her performance
Both a teacher and a student can assess their performances✔️
A head teacher can assess his/her teaching

Correct Answer Logic:

Educational evaluation is a comprehensive, two-way process involving both teachers and students assessing their respective performances. Teachers evaluate their instructional effectiveness (did students achieve objectives?); students evaluate their own learning progress (what did I understand/achieve?). Modern evaluation is reciprocal and collaborative. It encompasses self-evaluation, peer evaluation, formative and summative assessment — benefiting all stakeholders in the teaching-learning process.

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Education QUESTION #6784

Question 2311

A test item reads: 'Which of the following is NOT an example of formative assessment?' with correct answer option 'Final examination'. A student incorrectly answers 'Weekly quiz'. According to item analysis in CTT, if students with high total test scores systematically choose 'weekly quiz' as their answer, what does the discrimination index likely indicate?

A high positive D value, indicating the item works well
A negative D value, indicating that the item functions in reverse — high achievers are misled while lower achievers answer correctly — suggesting the item needs immediate review✔️
A D value near 0, indicating the item has no differential effect
A D value above 0.40, indicating excellent item quality

Correct Answer Logic:

If high-scoring students are more likely to answer incorrectly than low-scoring students, the item discrimination index D = (Upper Group % Correct) – (Lower Group % Correct) will be negative. Negative D values are the most serious item analysis warning sign, typically indicating a keying error, ambiguous wording, or a misleading clue that advantageously targets lower-ability guessers over informed higher-ability students.

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Math Physics Chemistry Biology QUESTION #582

Question 2312

Name the human tissues that contain about 85% water

Nerve cells
Bone cells
Brain cells✔️
None of these

Correct Answer Logic:

Brain tissue has high water content (~85%)

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Ability / HR / Governance / Special Education QUESTION #1909

Question 2313

Under Rule 2(1)(xviii) the term 'Secretary' includes which of the following officers when there is no Secretary in charge of a Division?

Deputy Secretary
Section Officer
Additional Secretary Senior Joint Secretary or Joint Secretary in charge of the Division or Ministry✔️
Under Secretary

Correct Answer Logic:

Rule 2(1)(xviii) states that where there is no Secretary the term Secretary means the Additional Secretary Senior Joint Secretary or Joint Secretary in charge of the Division or Ministry.

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Boilers Mechanical Engineering QUESTION #2481

Question 2314

A 'lower kinematic pair' as defined by Reuleaux has what type of contact between its elements?

Point contact
Curve (line) contact
Surface contact✔️
No direct contact (magnetic coupling)

Correct Answer Logic:

Reuleaux coined 'lower kinematic pair' for joints with surface (area) contact, such as revolute and prismatic pairs. Lower pairs have the practical advantage of better lubricant retention.

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Islamic Studies QUESTION #7920

Question 2315

Ramadan is the _____ month of Islamic Calendar

7th
9th✔️
1st
10th

Correct Answer Logic:

Ramadan is the 9th month of the Islamic (Hijri) calendar. It is the holiest month when Muslims fast from dawn to sunset. The Quran was first revealed during this month, specifically on Laylat al-Qadr (the Night of Power), which is believed to fall in the last ten nights of Ramadan.

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Biology Zoology Botany QUESTION #10810

Question 2316

In marsupials, the gestation period (in utero development) typically varies between:

8–20 days
8–30 days✔️
8–40 days
8–48 days

Correct Answer Logic:

Marsupial gestation is extremely short — typically 8–30 days — because marsupials lack a true chorioallantoic placenta. The young (joey) is born at a very early developmental stage and crawls to the mother's pouch (marsupium) where it attaches to a nipple and completes development. For example, Virginia opossum: ~12 days; kangaroos: ~30–36 days. Compare to placental mammals, whose much longer gestation allows more complete foetal development.

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Chemistry QUESTION #1096

Question 2317

Among compounds I (benzene sp$^2$ C–H*), II (phenylacetylene sp C–H*) and III (cyclopropane C–H*), correct order of C–H bond dissociation energy:

III $>$ II $>$ I✔️
II $>$ III $<$ I
II $>$ I $>$ III
I $>$ II $>$ III

Correct Answer Logic:

Bond dissociation energy of C–H bond depends on hybridization of carbon: sp $>$ sp$^2$ $>$ sp$^3$. Compound II (alkyne/phenylacetylene): sp C–H — highest BDE. Compound III (cyclopropane): C–H has partial sp$^2$ character due to ring strain → BDE between sp$^2$ and sp. Compound I (benzene): sp$^2$ C–H. Order: II $>$ III $>$ I. Answer: option (1) III > II > I is wrong. Correct is II > III > I = option (3).

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Nursing QUESTION #9161

Question 2318

Herd immunity is achieved when a sufficient proportion of a population becomes immune. For measles, the herd immunity threshold is approximately:

50–60%
70–75%
92–95%✔️
80–85%

Correct Answer Logic:

Herd immunity threshold depends on the basic reproduction number (R_0) of the disease:

H = 1 - \\frac{1}{R_0}

For measles, R_0 is 12–18 (highly contagious), making the herd immunity threshold approximately 92–95%. This is why measles can re-emerge even with 90% vaccination coverage. A Head Nurse must understand herd immunity concepts to advocate for achieving high vaccination coverage targets in EPI campaigns.

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Planning QUESTION #5019

Question 2319

What does 'accessibility index' measure in transportation planning?

Number of roads
Travel time or cost to reach opportunities✔️
Traffic volume
Parking availability

Correct Answer Logic:

Accessibility index quantifies ease of reaching destinations (jobs, services, amenities) from a location, typically calculated as $A_i = \sum_j O_j \cdot f(c_{ij})$ where $O_j$ is opportunities at $j$ and $f(c_{ij})$ is impedance function of cost/time, measuring location advantage.

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Law QUESTION #9509

Question 2320

A obtains a decree for Rs. 1,000,000 with interest at 10% per annum from the date of the suit. B satisfies only the principal amount. A applies to execute the decree for post-decree interest. B argues the decree is silent about post-decree interest, so none is payable. Is B correct?

No; post-decree interest is automatically equal to the pre-decree interest rate
No; Section 34(2) CPC provides that where a money decree is silent about further interest from the date of the decree to payment, the Court shall be presumed to have refused such further interest, but the Court retains power to award interest at the Court rate in appropriate cases; moreover, the decree-holder may apply for interest under the terms of the decree✔️
Yes; once the principal is paid the decree is fully satisfied
Yes; if the decree is silent, no post-decree interest accrues

Correct Answer Logic:

Section 34 CPC governs interest. Sub-section (2) provides that silence in a decree on further interest creates a presumption of refusal of post-decree interest at the rate awarded, though the Court may award interest at the Court rate. If the decree expressly awards interest from the date of suit to the date of decree, it speaks only to that period; execution for post-decree interest depends on the terms of the decree and Section 34(2).

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