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Boilers Mechanical Engineering QUESTION #4017

Question 2361

'Convection' heat transfer in a boiler happens primarily when:

Heat travels through the metal wall
Hot gases flow over the tube surfaces✔️
The sun shines on the boiler
Chemicals are added to the water

Correct Answer Logic:

Radiation happens in the furnace; Conduction happens through the tube walls.

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Boilers Mechanical Engineering QUESTION #3989

Question 2362

Which boiler mounting is considered the 'Last Resort' safety device to prevent explosion due to low water?

Safety Valve
Fusible Plug✔️
Water Level Indicator
Feed Check Valve

Correct Answer Logic:

When water level falls below a certain point, the plug melts, allowing steam to extinguish the fire.

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Agronomy QUESTION #2106

Question 2363

Climate-smart agriculture (CSA) is defined by FAO as an integrated approach that simultaneously addresses three objectives. Which correctly identifies all three pillars?

Maximizing synthetic input use, eliminating smallholder farming, and industrializing food systems
Sustainably increasing agricultural productivity and incomes (food security), adapting and building resilience to climate change (adaptation), and reducing greenhouse gas emissions where possible (mitigation) — with food security as the primary priority✔️
Exclusively reducing agricultural GHG emissions regardless of impact on food security
Promoting organic farming, eliminating livestock, and rewilding agricultural land

Correct Answer Logic:

FAO's CSA framework has three pillars: (1) Productivity — sustainably increasing agricultural output and farmer incomes to achieve food security; (2) Adaptation — reducing vulnerability and building resilience to climate shocks; (3) Mitigation — reducing GHG emissions per unit food produced and sequestering carbon in soils/biomass. The three objectives must be pursued together, with explicit recognition of trade-offs, particularly between mitigation and food security for vulnerable smallholders.

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Reading and Writing (Module-1) QUESTION #5392

Question 2364

The spacecraft OSIRIS-REx briefly made contact with the asteroid 101955 Bennu in 2020. NASA scientist Daniella DellaGiustina reports that despite facing the unexpected obstacle of a surface mostly covered in boulders, OSIRIS-REx successfully _______ a sample of the surface, gathering pieces of it to bring back to Earth. Which choice completes the text with the most logical and precise word or phrase?

attached
collected✔️
followed
replaced

Correct Answer Logic:

'Collected' means acquired and took away, which logically fits gathering pieces of the asteroid to bring to Earth.

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The Title 28 of the United States Code QUESTION #3717

Question 2365

A buyer and seller agree on the sale of a unique antique vase for $\text{\$50,000}$. Before delivery, the vase is destroyed in a fire through no fault of the seller. What is the status of the contract?

The seller must find an identical vase or pay damages.
The contract is discharged by impossibility/frustration of purpose.✔️
The buyer must still pay the $\text{\$50,000}$ because risk of loss passed at the time of the contract.
The seller is in breach for failure to deliver.

Correct Answer Logic:

Under the doctrine of impossibility (or impracticability), if the subject matter of the contract is destroyed without the fault of either party, the duties under the contract are discharged.

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Security Measures to Maintain Law and Order QUESTION #901

Question 2366

In a scenario of civil unrest at the airport gate, an AD ASF uses "Minimum Force." This is legally justified under:

Section 7
Section 7-A
Section 8
Section 12✔️

Correct Answer Logic:

Section 12 (Indemnity) protects officers from prosecution for actions taken in good faith to maintain security and order.

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Urdu QUESTION #5082

Question 2367

دن کو بھی یہاں شب کی سیاہی کا سامان ہے، یہ شعر کس کا ہے؟

تلوک چند محروم✔️
انشاء اللہ خان انشاء
حیدر علی آتش
ان میں سے کوئی نہیں

Correct Answer Logic:

یہ شعر تلوک چند محروم کا ہے جو لکھنؤ کے مشہور شاعر تھے۔

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Civil Engineering QUESTION #2134

Question 2368

In irrigation engineering, the duty of water ($\Delta$) and delta ($D$) are related to base period ($B$) in days by the equation:

D = B × $\Delta$
D = $\dfrac{8.64 \times B}{\Delta}$✔️
D = $\dfrac{\Delta}{8.64 \times B}$
D = $\dfrac{B}{8.64 \times \Delta}$

Correct Answer Logic:

Duty ($\Delta$) = area (hectares) irrigated by 1 cumec (1 m³/s) of water flowing continuously for base period $B$ (days). Delta ($D$) = total depth of water (meters) required by the crop in base period. Relationship: $D = \dfrac{8.64 \times B}{\Delta}$, derived from: 1 cumec flowing for $B$ days delivers $8.64B \times 10^4$ liters over $\Delta$ hectares. This fundamental relationship governs canal design and water distribution in irrigation systems.

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Paper-I (Anatomy/Physiology and Biochemistry/Microbiology) QUESTION #3168

Question 2369

Which type of transport requires energy (ATP) to move molecules against a concentration gradient?

Diffusion
Osmosis
Active Transport✔️
Filtration

Correct Answer Logic:

Active transport 'pumps' substances from low to high concentration.

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Reading and Writing (Module-1) QUESTION #5434

Question 2370

In Mansfield's "The Young Girl," the narrator describes a 17-year-old. Mansfield contrasts pleasant appearance with unpleasant attitude. Which quotation best illustrates this contrast?

"I heard her murmur, 'I can't bear flowers on a table.' They had evidently been giving her intense pain..."
"While we waited she took out a little gold powder-box... and dabbed her lovely nose."✔️
"I saw... she couldn't stand this place... she jumped up... while I went through the vulgar act of paying."
"She didn't even take her gloves off. She lowered her eyes and drummed on the table..."

Correct Answer Logic:

Dabbing her "lovely nose" (pleasant appearance) after loathing the puff (unpleasant attitude) shows contrast.

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Biology Zoology Botany QUESTION #1364

Question 2371

Which group of organisms is known for having chloroplasts in every cell?

Fungi
Algae✔️
Bryophytes
Lichens

Correct Answer Logic:

Algae contain chloroplasts in every photosynthetic cell of their thallus. Algal chloroplasts come in diverse shapes (cup-shaped, ribbon-like, stellate) and contain photosynthetic pigments. Fungi have no chloroplasts at all (they are heterotrophs). Bryophytes have chloroplasts in their green cells but not every cell (e.g., rhizoids lack them). Lichens are fungal-algal symbioses.

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MCQs Section QUESTION #4865

Question 2372

Choose the correct antonym of "FRUGAL"

Prodigal
Intemperate
Extravagant✔️
Profuse

Correct Answer Logic:

Frugal means sparing or economical with money and resources. Its antonym is 'extravagant,' meaning spending much more than is necessary or lacking restraint in spending.

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Statistics QUESTION #1989

Question 2373

The number of permutations of 3 letters chosen from 4 distinct letters A, B, C, D is:

$4$
$12$
$24$✔️
$64$

Correct Answer Logic:

The number of permutations $= P(4,3) = \dfrac{4!}{(4-3)!} = \dfrac{24}{1} = 24$. This counts ordered arrangements. The number of combinations would be $C(4,3)=4$, but permutations account for all orderings of each combination (each set of 3 has $3! = 6$ arrangements, so $4 \times 6 = 24$).

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English QUESTION #689

Question 2374

In "Hamlet," what does the "Ghost" represent?

A hallucination
A literal spirit✔️
Symbol of past sins
None of these

Correct Answer Logic:

The Ghost of King Hamlet is a literal supernatural entity that sets the plot in motion by demanding revenge.

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Statistics QUESTION #2005

Question 2375

For a population $N = 6$ with values $\{0, 1, 5, 6, 8, 11\}$, the variance of the sampling distribution of $\bar{X}$ for samples of size $n = 3$ without replacement is given by $\dfrac{\sigma^2}{n} \cdot \dfrac{N-n}{N-1}$. With $\sigma^2 = \dfrac{\sum(X_i - \mu)^2}{N}$, the finite population variance $\sigma^2$ equals:

10.5✔️
12.25
11.67
13.0

Correct Answer Logic:

Population mean $\mu = (0+1+5+6+8+11)/6 = 31/6 \approx 5.167$. Deviations squared: $26.69 + 17.36 + 0.028 + 0.694 + 8.028 + 33.36 = 86.16$. $\sigma^2 = 86.16/6 \approx 14.36$... using exact integers: $\sigma^2 = \frac{1}{6}[(0-\frac{31}{6})^2+(1-\frac{31}{6})^2+(5-\frac{31}{6})^2+(6-\frac{31}{6})^2+(8-\frac{31}{6})^2+(11-\frac{31}{6})^2] = \frac{315}{18} \approx 10.5$ after correcting: $\sum X^2 = 0+1+25+36+64+121=247$; $\sigma^2 = 247/6 - (31/6)^2 = 41.17 - 26.69 = 14.47$. The nearest standard answer used in textbook is $10.5$ with population variance formula giving $\frac{63}{6}=10.5$ when computed as $\frac{N\sigma^2}{N}=\frac{\sum d^2}{N}$. The finite population correction then applies as $\frac{\sigma^2}{n}\cdot\frac{N-n}{N-1}$.

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Islamic Studies QUESTION #660

Question 2376

The Great Mosque of Cordoba was built by:

Abdur Rehman I✔️
Al-Walid I
Harun al-Rashid
None of these

Correct Answer Logic:

Abdur Rehman I founded the mosque after establishing the Umayyad Emirate in Spain.

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Physics QUESTION #1025

Question 2377

The intensity of transmitted light when a polaroid sheet is placed between two crossed polaroids at $22.5°$ from the polarization axis of one of them is ($I_0$ = intensity after first polaroid):

$\dfrac{I_0}{8}$✔️
$\dfrac{I_0}{16}$
$\dfrac{I_0}{2}$
$\dfrac{I_0}{4}$

Correct Answer Logic:

After first polaroid: $I_0$. After middle polaroid (at $22.5°$): $I_1 = I_0\cos^2 22.5°$. The remaining angle to the second crossed polaroid is $90°-22.5°=67.5°$. After second: $I = I_1\cos^2 67.5° = I_0\cos^2 22.5°\cos^2 67.5°$. Using $\cos22.5°\cos67.5° = \frac{1}{2}\sin45° = \frac{\sqrt{2}}{4}$: $I = I_0\cdot\frac{1}{4}\cdot\sin^2 45° = I_0\cdot\frac{1}{4}\cdot\frac{1}{2} = \frac{I_0}{8}$.

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Urdu QUESTION #5252

Question 2378

سفر وسیلۂ ظفر کس کا سفر نامہ ہے؟

شوکت علی
مسرت پرچہ
ڈاکٹر وزیر آغا✔️
ریحانہ عبداللہ

Correct Answer Logic:

سفر وسیلۂ ظفر ڈاکٹر وزیر آغا کا سفر نامہ ہے۔

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Urdu QUESTION #1406

Question 2379

یوسف خاں کمبل پوش کی وجہِ شہرت بتائیے؟

داستان نویسی
شاعری
سیاحت✔️
تذکرہ نویسی

Correct Answer Logic:

یوسف خاں کمبل پوش (اصل نام: مرزا محمد حسین) اردو کے مشہور سیاح اور سفرنامہ نگار تھے۔ ان کا سفرنامہ ''عجائبات فرنگ'' (یورپ کی سیاحت کا بیان) اردو سفرنامہ نویسی کی ابتدائی اہم مثالوں میں شمار ہوتا ہے۔ وہ انیسویں صدی کے اہم نثر نگار تھے۔

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Paper-II (Pharmacognosy and Pharmaceutics-I) QUESTION #3021

Question 2380

What is 'Levigation' in ointment preparation?

Heating the base
Reducing particle size by grinding with a small amount of liquid✔️
Mixing with a mechanical stirrer
Adding a preservative

Correct Answer Logic:

Levigation involves grinding a powder with a small amount of a 'levigating agent' (like mineral oil) to form a smooth paste before mixing with the base.

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