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Boilers Mechanical Engineering QUESTION #4046

Question 781

'Balanced Draft' means:

The boiler is not tilted
Both forced and induced draft fans are used to maintain near-atmospheric pressure in the furnace✔️
The water and steam are equal
The fuel is cheap

Correct Answer Logic:

This prevents flue gas leakage into the boiler room.

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Electrical Engineering QUESTION #2163

Question 782

The open-loop transfer function of a unity feedback system is $G(s) = \frac{K}{s(s+2)(s+4)}$. By the Routh-Hurwitz criterion, the system is marginally stable when $K$ equals:

$48$✔️
$24$
$16$
$8$

Correct Answer Logic:

Characteristic equation: $s^3 + 6s^2 + 8s + K = 0$. Routh array row 3 pivot: $\frac{48-K}{6}$. For marginal stability: $48 - K = 0 \Rightarrow K = 48$.

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Biology QUESTION #7283

Question 783

Algae have cell walls made up of:

Cellulose, hemicellulose and pectins
Cellulose, galactans and mannans✔️
Hemicellulose, pectins and proteins
Pectins, cellulose and proteins

Correct Answer Logic:

The cell walls of algae are composed of cellulose, galactans, and mannans (polysaccharides). Some algae also have additional components: diatoms have silica; red algae have agar and carrageenan (both galactans). This distinguishes algal walls from plant walls (cellulose + hemicellulose + pectin) and fungal walls (chitin).

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MCQs Section QUESTION #4853

Question 784

Choose the word nearly opposite in meaning to "PENCHANT"

Dislike✔️
Attitude
Imminence
Distance

Correct Answer Logic:

Penchant means a strong or habitual liking for something. Its antonym is 'dislike,' meaning a feeling of distaste or aversion toward something.

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Biology Zoology Botany QUESTION #1341

Question 785

Prader-Willi syndrome is the heterozygous deletion in the long arm of chromosome at:

5
15✔️
3
None of these

Correct Answer Logic:

Prader-Willi syndrome results from loss of function of genes on the paternal copy of chromosome 15q11-q13 (long arm of chromosome 15). This is typically due to a deletion in the paternal chromosome 15. The same region, when deleted from the maternal chromosome, causes Angelman syndrome — a classic example of genomic imprinting.

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Mathematics QUESTION #6949

Question 786

Let $p = \displaystyle\lim_{x\to0^+}\left(1+\tan^2\sqrt{x}\right)^{\frac{1}{2x}}$. Find $\ln p$.

1
$\dfrac{1}{2}$✔️
$\dfrac{1}{4}$
2

Correct Answer Logic:

This is a $1^\infty$ indeterminate form. Take logarithm:

$\ln p = \lim_{x\to0^+}\dfrac{\ln(1+\tan^2\sqrt{x})}{2x}$

Let $t=\sqrt{x}$, so $x=t^2$, $x\to0^+$ means $t\to0^+$:

$= \lim_{t\to0^+}\dfrac{\ln(1+\tan^2 t)}{2t^2} = \lim_{t\to0^+}\dfrac{\tan^2 t}{2t^2} = \dfrac{1}{2}$

(using $\ln(1+u)\approx u$ for small $u$ and $\lim_{t\to0}\frac{\tan t}{t}=1$)

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General Knowledge QUESTION #4764

Question 787

Hu Jintao held which positions simultaneously in China?

General Secretary of Communist Party only
President of China only
Both General Secretary of Communist Party and President✔️
Premier of the State Council

Correct Answer Logic:

Hu Jintao served simultaneously as General Secretary of the Communist Party of China and President of the People's Republic of China from 2002/2003 to 2012/2013.

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MCQs Section QUESTION #4869

Question 788

Correct antonym of "MORATORIUM" is

Large tomb
Waiting period✔️
Security for debt
Funeral house

Correct Answer Logic:

Moratorium means a temporary prohibition or suspension of an activity. Its antonym is 'waiting period' — however, moratorium itself means a pause/delay, so the answer here points to 'waiting period' as the closest contextual opposite implying continuation rather than suspension.

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Urdu QUESTION #5191

Question 789

درست محاورہ بتائیں؟

ٹانگ ٹانگے مارنا
ناچ نہ جانے آنگن ٹیڑھا✔️
تارے دکھائی دینا
ان میں سے کوئی نہیں

Correct Answer Logic:

صحیح ضربِ مثل ہے: 'ناچ نہ جانے آنگن ٹیڑھا' یعنی اپنی غلطی کو چھپانے کے لیے بہانہ ڈھونڈنا۔

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Urdu QUESTION #5069

Question 790

وہ الفاظ جو تلفظ میں مختلف ہوں لیکن معنی ایک ہوں کیا کہلاتے ہیں؟

مترادف✔️
متضاد
ہم آواز
مہمل

Correct Answer Logic:

مترادف وہ الفاظ ہوتے ہیں جن کے معنی ملتے جلتے یا یکساں ہوں جیسے غم، الم، حزن۔

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English QUESTION #2642

Question 791

Choose the correct pronoun to complete the sentence: 'Between you and ___, the secret must remain safe.'

I
Me✔️
Mine
Myself

Correct Answer Logic:

The preposition 'between' requires the objective case ('me') rather than the nominative case ('I').

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Physics QUESTION #377

Question 792

The vertical velocity of ball thrown upward __________ with time.

Decreases linearly
Remains constant
Doubles✔️
Decreases parabolically

Correct Answer Logic:

Due to constant gravitational acceleration, velocity decreases linearly

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Biology QUESTION #7287

Question 793

Ringworm in humans is caused by:

Viruses
Bacteria
Fungi✔️
Nematodes

Correct Answer Logic:

Ringworm (tinea) is a common superficial fungal infection (dermatophytosis) caused by fungi such as Trichophyton, Microsporum, and Epidermophyton. Despite the name, no worm is involved. It causes circular, scaly, itchy patches on the skin. It is treated with antifungal agents like clotrimazole or terbinafine.

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General Abilities QUESTION #4528

Question 794

What is $\sqrt{(-5)^2}$?

$-5$
$5$✔️
$\pm 5$
$25$

Correct Answer Logic:

$\sqrt{a^2} = |a|$, the absolute value. So $\sqrt{(-5)^2} = \sqrt{25} = 5$

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Logical Reasoning QUESTION #3951

Question 795

It is a common scientific belief that a full-scale nuclear conflict could _____ enough debris and soot to obscure the sun and cause a global freeze.

billow✔️
extinguish
generate
duplicate

Correct Answer Logic:

2

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English QUESTION #2770

Question 796

What does the phrase 'ONCE IN A BLUE MOON' mean? (Note: An idiom's meaning cannot be guessed from the individual words)

Very frequently
Every month
Very rarely✔️
During nighttime

Correct Answer Logic:

'Once in a blue moon' is an idiom meaning something that happens very rarely or infrequently. A 'blue moon' is a rare astronomical event, which is why it represents rarity. Example: 'He visits us once in a blue moon.'

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Pakistan Affairs QUESTION #285

Question 797

Why Arab rule could not extend beyond Sindh and Multan?

Geographical barriers and rigid terrain
Strong resistance from local rulers✔️
Lack of interest in territorial expansion
Internal conflicts among the Arabs

Correct Answer Logic:

Strong resistance from local Hindu dynasties like the Gurjara-Pratiharas halted further Arab expansion.+1

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Civil Procedure QUESTION #3685

Question 798

A citizen of State A sues a corporation in federal court for $\text{\$500,000}$. The corporation is incorporated in State B and has its only manufacturing plant in State A, but its 'nerve center' (headquarters where officers direct activities) is in State B. The corporation moves to dismiss for lack of diversity. How should the court rule?

Grant the motion, because the plant is in State A, making the corporation a citizen of State A.
Grant the motion, because the amount in controversy must be proven with certainty at the pleading stage.
Deny the motion, because under the 'nerve center' test, the corporation is a citizen only of State B.✔️
Deny the motion, because a corporation is only a citizen of its state of incorporation.

Correct Answer Logic:

Under 28 U.S.C. $\S 1332(c)(1)$ and the Supreme Court's ruling in Hertz Corp. v. Friend, a corporation's principal place of business is its 'nerve center.' Since the nerve center and incorporation are in State B, and the plaintiff is in State A, complete diversity exists.

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