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Fractional Distillation is used when the difference in boiling points between two miscible liquids is small (usually less than $25 \text{ K}$) [cite: 3, 59].

Since the difference here is only $5 \text{ K}$, a fractionating column is required to provide repeated condensation and vaporization cycles[cite: 4].

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Civil / Architecture QUESTION #2353

Question 4864

In LRFD design of steel tension members per AISC, the design strength for the fracture limit state (net section rupture) with $\phi_t = 0.75$ is:

$\phi_t P_n = 0.90 F_y A_g$
$\phi_t P_n = 0.75 F_u A_e$✔️
$\phi_t P_n = 0.85 F_y A_g$
$\phi_t P_n = 0.75 F_y A_e$

Correct Answer Logic:

For tension member fracture limit state: $\phi_t P_n = 0.75 F_u A_e$ where $F_u$ is the tensile strength, $A_e$ is the effective net area ($A_e = U \cdot A_n$, with $U$ being the shear lag factor), and $\phi_t = 0.75$. For yielding on the gross section: $\phi_t P_n = 0.90 F_y A_g$. The governing limit state is the lesser value.

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Nursing QUESTION #9292

Question 4865

The Somogyi effect in diabetes mellitus refers to:

Early morning hyperglycemia due to growth hormone release
Rebound hyperglycemia following nocturnal hypoglycemia✔️
Hypoglycemia occurring after meals
Persistent hyperglycemia unresponsive to insulin

Correct Answer Logic:

The Somogyi Effect (post-hypoglycemic hyperglycemia):

Nocturnal hypoglycemia occurs (often unnoticed during sleep)
Counter-regulatory hormones (glucagon, cortisol, epinephrine, GH) are released
Causes rebound morning hyperglycemia

Differentiation from Dawn Phenomenon:

Feature	Somogyi Effect	Dawn Phenomenon
Cause	Rebound from nocturnal hypoglycemia	Growth hormone/cortisol surge at 3–8 AM
3 AM glucose	Low (<60 mg/dL)	Normal or slightly elevated
Morning glucose	High	High
Management	Reduce evening insulin dose	Increase evening insulin or change timing

Checking 3 AM blood glucose helps distinguish these two conditions — important for Charge Nurse assessment.

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English QUESTION #2741

Question 4866

What is the correct direct speech of: 'She told me that she had finished the work.'?

She said 'I finished the work.'
She said 'I have finished the work.'✔️
She said 'I had finished the work.'
She said 'I will finish the work.'

Correct Answer Logic:

When converting from indirect to direct speech, the past perfect 'had finished' goes back one step to present perfect 'have finished'. So 'I have finished the work' is correct.

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Mathematics QUESTION #1260

Question 4867

The dimension of the subspace $W$ of all symmetric $2\times 2$ matrices (as a subspace of the vector space of all $2\times 2$ matrices) is:

1
2
3✔️
4

Correct Answer Logic:

A general symmetric $2\times2$ matrix has the form $\begin{pmatrix}a&b\\b&c\end{pmatrix}$ with 3 free parameters $a,b,c$. A basis is: $\left\{\begin{pmatrix}1&0\\0&0\end{pmatrix},\begin{pmatrix}0&1\\1&0\end{pmatrix},\begin{pmatrix}0&0\\0&1\end{pmatrix}\right\}$. So $\dim(W)=3$.

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Pakistan Affairs QUESTION #9121

Question 4868

May 28th is celebrated as 'Yaum-e-Takbeer' in Pakistan because of which event?

Start of Kargil conflict
Successful nuclear tests (Youm-e-Takbeer)✔️
Ojhi Camp tragedy
Uprising in Kashmir

Correct Answer Logic:

May 28, 1998, Pakistan conducted nuclear tests.

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MCQs Section QUESTION #4900

Question 4869

A letter by Mark Twain _____ reveals that Twain provided financial assistance to one of the first Black students at Yale Law School.

written in the same year as The Adventures of Huckleberry Finn were published
written in the same year of publication as The Adventures of Huckleberry Finn
written in the same year that The Adventures of Huckleberry Finn was published✔️
Mark Twain wrote a letter in the same year as he published The Adventures of Huckleberry Finn that

Correct Answer Logic:

The Adventures of Huckleberry Finn is a singular title so the verb must be 'was published,' not 'were published.' Option A uses 'were' incorrectly. Option B is ambiguous. Option D creates a misplaced modifier where 'that' could refer to either the letter or Huckleberry Finn.

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Biology QUESTION #7252

Question 4870

Flagellated male gametes are present in all three members of which one of the following sets?

Riccia, Dryopteris and Cycas✔️
Anthoceros, Funaria and Spirogyra
Zygnema, Saprolegnia and Hydrilla
Fucus, Marsilea and Calotropis

Correct Answer Logic:

Riccia (liverwort), Dryopteris (fern), and Cycas (gymnosperm) all produce flagellated (motile) antherozoids. Cycas is notable among gymnosperms for retaining multiflagellate sperms. Calotropis is an angiosperm with non-motile pollen. Spirogyra and Zygnema reproduce by conjugation without flagellated gametes.

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Boilers Mechanical Engineering QUESTION #4051

Question 4871

'Equivalent Evaporation' is a standard used to compare boilers, defined from and at:

$100^\circ\text{C}$✔️
$0^\circ\text{C}$
$200^\circ\text{C}$
Room temperature

Correct Answer Logic:

It calculates evaporation 'from and at $100^\circ\text{C}$' to normalize different operating pressures/temps.

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MCQs Section QUESTION #5216

Question 4872

قواعد کی رو سے مسجد ہے؟

اسمِ ظرفِ زمان
اسمِ ظرفِ مکان✔️
اسمِ نکرہ
ان میں سے کوئی نہیں

Correct Answer Logic:

مسجد ایک جگہ کا نام ہے اس لیے یہ اسمِ ظرفِ مکان کہلاتی ہے۔

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Planning QUESTION #4995

Question 4873

Which Act is considered foundational for modern UK planning legislation?

Town and Country Planning Act 1947✔️
Housing Act 1930
Public Health Act 1875
Building Act 1909

Correct Answer Logic:

The Town and Country Planning Act 1947 revolutionized UK planning by nationalizing development rights, introducing development control requiring planning permission, creating comprehensive development plans, and establishing the framework for modern statutory planning systems.

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Social Studies QUESTION #10012

Question 4874

Which country became the first in the world to grant women the right to vote?

Finland
Germany
New Zealand✔️
None of these

Correct Answer Logic:

New Zealand became the first self-governing country to grant women's suffrage, in 1893.

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Social Studies QUESTION #10076

Question 4875

Which of the following describes the process by which new ideas and technologies spread across a population?

Acculturation
Evolution
Diffusion✔️
None of these

Correct Answer Logic:

Diffusion refers to the spread of ideas, practices, or technologies from one group or place to another.

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Math Physics Chemistry Biology QUESTION #4324

Question 4876

Which part of the human brain maintains posture and balance of the body?

Cerebrum
Cerebellum✔️
Hypothalamus
Medulla oblongata

Correct Answer Logic:

The cerebellum coordinates voluntary muscle movement, maintains posture, and controls balance and equilibrium by receiving sensory input from muscles and the inner ear.

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Boilers Mechanical Engineering QUESTION #4022

Question 4877

'Induced Draft' fans are located:

Before the furnace
At the base of the chimney (after the boiler)✔️
Inside the drum
In the fuel tank

Correct Answer Logic:

They 'pull' the flue gases out of the boiler, creating a slightly negative pressure in the furnace.

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Paper-I (Anatomy/Physiology and Biochemistry/Microbiology) QUESTION #3223

Question 4878

'Referred Pain' is the phenomenon where:

Pain is only felt in the brain
Pain from a visceral organ is felt in a somatic area (like skin)✔️
Pain disappears quickly
Pain is imagined

Correct Answer Logic:

For example, heart pain is often felt in the left arm or jaw.

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Therapeutics and Patient Care QUESTION #3901

Question 4879

Among the following options, which drug is the LEAST suitable for the acute abortive treatment of migraine headache?

Oxycodone✔️
Ibuprofen
Sumatriptan
Aspirin

Correct Answer Logic:

Opioids like oxycodone are not recommended for migraine management, as they are less effective than triptans, NSAIDs, and aspirin and carry risks of medication overuse headache and dependence.

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Physics QUESTION #7329

Question 4880

Two projectiles of the same mass and speed are thrown at $60°$ and $30°$ with the horizontal. Which quantity is the same for both?

Time of flight
Range of projectile✔️
Maximum height
All of them

Correct Answer Logic:

For complementary angles ($60°$ and $30°$, since $60°+30°=90°$) with the same initial speed:

Range $R = \dfrac{u^2\sin2\theta}{g}$: $\sin(120°) = \sin(60°)$ ✓ — same range.

Time of flight $\propto \sin\theta$ — different. Max height $\propto \sin^2\theta$ — different.

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