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Boilers Mechanical Engineering QUESTION #4000

Question 4601

A 'Steam Trap' is a device that:

Catches steam for later use
Automatically discharges condensate and air without letting steam escape✔️
Filters out soot from steam
Turns steam into water

Correct Answer Logic:

Steam traps are vital for keeping steam lines efficient and preventing water hammer.

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Chemistry QUESTION #1019

Question 4602

Match the compounds (List-I) with appropriate catalysts/reagents (List-II) for reduction to amines. (A) $R\text{-CO-NH}_2$ (amide) (B) Nitrobenzene (C) $R\text{-C}{\equiv}\text{N}$ (nitrile) (D) Imide ($N$-substituted cyclic imide). Reagents: (I) NaOH(aq) (II) $\text{H}_2$/Ni (III) $\text{LiAlH}_4, \text{H}_2\text{O}$ (IV) Sn, HCl

(A)-(II), (B)-(I), (C)-(III), (D)-(IV)
(A)-(III), (B)-(II), (C)-(IV), (D)-(I)
(A)-(II), (B)-(IV), (C)-(III), (D)-(I)
(A)-(III), (B)-(IV), (C)-(II), (D)-(I)✔️

Correct Answer Logic:

Amide (A) reduced by $\text{LiAlH}_4$ (III). Nitrobenzene (B) reduced by Sn/HCl (IV) — classic reduction. Nitrile (C) reduced by $\text{H}_2/\text{Ni}$ (II). Cyclic imide (D) — Hofmann-like with NaOH(aq) (I). Matching: A-III, B-IV, C-II, D-I.

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Paper-II (Pharmacognosy and Pharmaceutics-I) QUESTION #3624

Question 4603

An 'Allergen' is a substance that:

Causes a disease
Triggers an allergic reaction (hypersensitivity)✔️
Cures a headache
Increases energy

Correct Answer Logic:

Allergens stimulate the immune system to react excessively.

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Urdu QUESTION #5184

Question 4604

سوانح عمری لکھنے میں حالی کے علاوہ دوسرا اہم نام کس کا ہے؟

شبلی نعمانی✔️
احمد ندیم قاسمی
سر سید احمد خان
ان میں سے کوئی نہیں

Correct Answer Logic:

اردو سوانح نگاری میں حالی کے بعد مولانا شبلی نعمانی کا نام بہت اہم ہے۔

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Physics QUESTION #1049

Question 4605

Two gases A and B in cylinders with pistons of radius $r_A$ and $r_B$. Equal heat at constant pressure. Pistons move 16 cm and 9 cm. Internal energy change same. Ratio $r_A/r_B$ is:

$\dfrac{2}{\sqrt{3}}$
$\dfrac{\sqrt{3}}{2}$
$\dfrac{4}{3}$✔️
$\dfrac{3}{4}$

Correct Answer Logic:

At constant pressure: $Q = \Delta U + W$. Same $\Delta U$ and same Q: so $W_A=W_B$. Work done $=p\cdot\pi r^2\cdot d$. So $\pi r_A^2\cdot16 = \pi r_B^2\cdot9\Rightarrow\frac{r_A^2}{r_B^2}=\frac{9}{16}\Rightarrow\frac{r_A}{r_B}=\frac{3}{4}$.

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Mathematics QUESTION #4124

Question 4606

The polar curve $r = 2\cos(\theta)$ represents which conic section?

Circle with center at origin, radius $2$
Circle with center at $(1, 0)$, radius $1$✔️
Circle with center at $(0, 1)$, radius $1$
Ellipse with semi-major axis $2$

Correct Answer Logic:

$r = 2\cos(\theta) \Rightarrow r^2 = 2r\cos(\theta) \Rightarrow x^2 + y^2 = 2x \Rightarrow (x-1)^2 + y^2 = 1$. Circle center $(1,0)$, radius $1$.

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Paper-II (Pharmacology and Social Behaviour, Law & Ethics and Computer Sciences) QUESTION #5794

Question 4607

A drug that has a substance substituted wholly or in part for it is considered:

Adulterated✔️
Spurious
Misbranded
Substandard

Correct Answer Logic:

Substitution of ingredients is a hallmark of adulteration[cite: 7].

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Home Economics QUESTION #6281

Question 4608

A color scheme that uses different shades, tints, and tones of a single hue is called:

Triadic
Complementary
Analogous
Monochromatic✔️

Correct Answer Logic:

Monochromatic schemes provide a sense of unity and calm by staying within one color family.

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Administration QUESTION #9542

Question 4609

Elton Mayo's Hawthorne experiments began as a study of physical conditions (lighting) on productivity but produced a result that invalidated the original hypothesis. What was the theoretical conclusion, and why did it matter for public administration specifically?

Productivity is maximized through scientific determination of optimal physical conditions for work
Group dynamics, social relationships and the feeling of being 'noticed' are more powerful drivers of productivity than physical variables✔️
Workers are fundamentally motivated by economic incentives and respond to wage-linked performance systems
Informal organizations always conflict with formal structures and must be managed through authority

Correct Answer Logic:

Both the control and experimental groups increased performance regardless of lighting changes. Mayo concluded that productivity was driven by social factors — morale, group belonging, managerial attention. For public administration, this shifted focus from mechanical efficiency (Classical School) to the human and social dimensions of organizational life.

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Education QUESTION #6873

Question 4610

A Subject Specialist in Education is designing a classroom seating plan. Which of the following accurately describes how seating configuration should be determined, according to sound classroom management principles?

Seating should always be in rows to maximize teacher visibility and control
Seating should be determined by the lesson plan and the instructional objectives of each lesson✔️
Students should choose their own seats to promote autonomy and reduce resistance
Seating should remain fixed year-round to establish predictability and routine

Correct Answer Logic:

Seating arrangement is not a static administrative decision — it should be directly aligned with instructional purpose. Group seating supports cooperative learning; rows support independent work; U-shaped or circular arrangements facilitate whole-group discussion. Effective teachers modify seating to match the nature of each learning activity.

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Physics QUESTION #7011

Question 4611

When a soft ferromagnetic material is placed in an external magnetic field, what happens to its magnetic domains?

They decrease in size and change orientation
They may increase or decrease in size and also change orientation✔️
They increase in size but do not change orientation
They have no relationship with the external magnetic field

Correct Answer Logic:

In a soft ferromagnetic material placed in an external magnetic field:

Domains whose magnetisation is aligned with the field grow in size (domain wall movement).
Domains misaligned with the field shrink in size.
Additionally, domain magnetisation can rotate to align with the applied field (domain rotation).

Therefore, domains may both increase or decrease in size AND change orientation. Option B is correct.

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Accounting & Finance QUESTION #6061

Question 4612

A house building advance of Rs. 2 million is paid to employees. In accounting terms, this payment is classified as a:

Asset✔️
Revenue Expenditure
Capital Expenditure
Deferred Revenue Expenditure

Correct Answer Logic:

An advance paid to employees (such as a house-building advance) creates a receivable for the organization — the employee owes the money back. It is therefore recorded as an Asset (specifically a long-term receivable or loan to employees) on the balance sheet. It is not an expense until it is written off or adjusted, so it is neither revenue expenditure nor capital expenditure in the traditional sense.

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Journalism / Mass Communication QUESTION #6371

Question 4613

The first printing press in a Muslim territory was established in Andalusia (Muslim Spain) in the 1480s. Which of the following statements about this press is CORRECT?

It was set up by the Ottoman government to spread Islamic scholarship
It was operated by a family of Jewish merchants who printed texts using the Hebrew script✔️
It was established by Christopher Columbus to print navigation charts
It was the first press to use movable type in any Muslim territory and printed the Quran

Correct Answer Logic:

This is a frequently misunderstood historical fact. According to the textbook, the first printing press in Muslim territory was established in Andalusia (Muslim-ruled Spain) in the 1480s. Crucially, it was operated not by Muslim scholars but by a family of Jewish merchants, who used it to print texts in the Hebrew script. After the fall of Granada to Catholic Spain in the 1490s (completing the Reconquista), this press was relocated — the textbook notes it moved to Istanbul, which had become a major destination for the Sephardic Jewish community expelled from Spain. Islamic calligraphic traditions were highly valued, and there was cultural resistance to the printing press in many parts of the Muslim world, which partly explains why the technology spread more slowly there than in Christian Europe despite the Muslim world's earlier familiarity with papermaking.

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Physics QUESTION #7013

Question 4614

A magnetic needle has magnetic moment $9.85 \times 10^{-2}\ \text{A/m}^2$ and moment of inertia $5 \times 10^{-6}\ \text{kg\,m}^2$. It performs 10 complete oscillations in 5 seconds in a uniform magnetic field. Find the magnitude of the field in mT.
(Take $\pi^2 = 9.85$)

10 mT✔️
20 mT
5 mT
1 mT

Correct Answer Logic:

Time period: $T = \frac{5}{10} = 0.5\ \text{s}$

Formula for oscillation: $T = 2\pi\sqrt{\frac{I}{MB}}$

$B = \frac{4\pi^2 I}{MT^2} = \frac{4 \times 9.85 \times 5\times10^{-6}}{9.85\times10^{-2} \times (0.5)^2}$

$= \frac{4 \times 9.85 \times 5\times10^{-6}}{9.85\times10^{-2} \times 0.25} = \frac{20\times10^{-5}}{2.4625\times10^{-3}} = 0.01\ \text{T} = 10\ \text{mT}$

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Law QUESTION #9482

Question 4615

A files a suit for rent against B. While the suit is pending, A obtains an interim injunction restraining B from transferring the tenanted property. It is later proved that A obtained the injunction on deliberately suppressed and false facts. B claims compensation. Can B obtain compensation within the same proceedings?

No; only the High Court can award such compensation
Yes; B may apply under Section 95 CPC in the same suit for compensation for having obtained the injunction on insufficient grounds, without needing a separate suit✔️
No; B must file a separate suit for compensation
Yes; but only after the injunction is vacated

Correct Answer Logic:

Section 95 CPC provides that where an arrest, attachment, or injunction is obtained on insufficient grounds, the Court in the same suit may award reasonable compensation to the defendant on his application. A separate suit is not required.

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