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Boilers Mechanical Engineering QUESTION #4047

Question 361

'Exfiltration' in a boiler furnace refers to:

Air leaking in
Flue gases leaking out of the setting✔️
Fuel leaking into the water
Water leaking into the fuel

Correct Answer Logic:

Usually happens in positive-pressure furnaces if the casing is not tight.

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Accounting & Finance QUESTION #6164

Question 362

According to the 'Percentage of Sales' forecasting method, which of the following is generally classified as 'Spontaneous Financing'?

Long Term Bonds
Retained Earnings
Accounts Payable✔️
Mortgage Loans

Correct Answer Logic:

Lesson 05 states that Current Liabilities like Accounts Payable generally grow in proportion to sales and are called Spontaneous Financing.

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Agronomy QUESTION #2105

Question 363

C4 photosynthesis confers agronomic advantages over C3 photosynthesis under high temperature and high irradiance conditions primarily because:

C4 plants have more chlorophyll and larger leaves than C3 plants
The C4 CO₂-concentrating mechanism (using PEP carboxylase in mesophyll cells to fix CO₂ as oxaloacetate/malate, then decarboxylating in bundle sheath cells to deliver high CO₂ to Rubisco) suppresses photorespiration and allows near-maximum photosynthesis at high temperatures when Rubisco oxygenase activity would otherwise dominate✔️
C4 plants have deeper root systems that access subsoil water inaccessible to C3 plants
C4 plants fix nitrogen more efficiently, requiring less protein investment in Rubisco

Correct Answer Logic:

At high temperatures, Rubisco's oxygenase activity (photorespiration) increases relative to carboxylase in C3 plants, wasting 30–50% of fixed carbon. C4 plants pump CO₂ to bundle sheath cells at 10–80× atmospheric concentration, suppressing oxygenase competition and photorespiration. This gives C4 crops (maize, sorghum, sugarcane, millet) higher radiation use efficiency, WUE, and NUE under tropical conditions.

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Reading and Writing (Module-1) QUESTION #5313

Question 364

This excerpt is adapted from Emily Pauline Johnson's 1913 story 'The King's Coin.' Fox-Foot, an Ojibwe man, is leading fur traders by canoe and fears they are being tracked. At supper time, Fox-Foot would allow no fire to be built, no landing to be made, no trace of their passing to be left. As used in the text, what does the word 'trace' most nearly mean?

Evidence✔️
Blemish
Amount
Sketch

Correct Answer Logic:

In this context, 'trace' refers to signs or evidence that would reveal they had passed through the area.

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Boilers Mechanical Engineering QUESTION #4019

Question 365

The 'Boiling Point' of water inside a boiler at $10~bar$ pressure is:

Exactly $100^\circ\text{C}$
Higher than $100^\circ\text{C}$✔️
Lower than $100^\circ\text{C}$
The same as at sea level

Correct Answer Logic:

As pressure increases, the boiling temperature of water also increases.

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Chemistry QUESTION #7351

Question 366

Measurement of an electron's position introduces an uncertainty in momentum equal to $1 \times 10^{-18}$ g cm s$^{-1}$. The uncertainty in electron velocity (mass of electron $= 9 \times 10^{-28}$ g) is:

$1 \times 10^{11}$ cm s$^{-1}$
$1 \times 10^{9}$ cm s$^{-1}$✔️
$1 \times 10^{6}$ cm s$^{-1}$
$1 \times 10^{5}$ cm s$^{-1}$

Correct Answer Logic:

Formula: $\Delta v = \dfrac{\Delta p}{m}$

$\Delta v = \dfrac{1 \times 10^{-18}}{9 \times 10^{-28}} = \dfrac{1}{9} \times 10^{10} \approx 1 \times 10^9$ cm s$^{-1}$

This enormously large uncertainty in velocity illustrates why classical mechanics fails for electrons — they cannot have precisely defined trajectories.

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Ability / HR / Governance / Special Education QUESTION #1810

Question 367

Under Rule 42(e), the force account method may be used only if the value of procurement does not exceed:

Fifty million Pakistani Rupees
One hundred million Pakistani Rupees
Two hundred million Pakistani Rupees✔️
Five hundred million Pakistani Rupees

Correct Answer Logic:

Rule 42(e) inserted via S.R.O. 834(I)/2021 permits the use of force account only when the value of procurement does not exceed two hundred million Pakistani Rupees, and subject to the specific conditions enumerated in sub-clauses (i) through (vi) of that rule.

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Paper-I (Anatomy/Physiology and Biochemistry/Microbiology) QUESTION #3332

Question 368

'Tyndallization' is a process of:

Freezing bacteria
Intermittent sterilization using steam at $100^\circ\text{C}$✔️
Using UV light
Using sound waves

Correct Answer Logic:

It is used for materials that might be damaged by the higher temperatures of an autoclave.

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Chemistry QUESTION #7826

Question 369

Distillation under very reduced pressure is called:

Destructive distillation
Fractional distillation
Steam distillation
Vacuum distillation✔️

Correct Answer Logic:

Vacuum distillation lowers boiling points, used for heat-sensitive compounds.

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Civil Engineering QUESTION #6619

Question 370

The 'Effective Length Factor' ($K$) for a column that is perfectly fixed at the base and perfectly pinned at the top (theoretical value) is:

0.5
0.7✔️
1
2

Correct Answer Logic:

For a fixed-pinned column, the theoretical $K$ is 0.7. (Recommended design value is often 0.8 to account for imperfect fixity).

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Quantitative Reasoning QUESTION #8036

Question 371

PROLOGUE : NOVEL :: (Find the pair that best matches the relationship between the given words)

preamble : statute✔️
sketch : drawing
movement : symphony
index : book

Correct Answer Logic:

A PROLOGUE is an introductory section of a NOVEL that comes before the main content. A preamble is an introductory section of a statute (law) that precedes the main legal text. Both pairs = [introductory preface] : [the larger work it belongs to]. 'Index:book' is part of a book but appears at the end. 'Movement:symphony' is a component, not an introduction.

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General Knowledge QUESTION #4720

Question 372

Under Vision 2025, WAPDA planned to construct Satpara Dam in which region?

Balochistan
NWFP
Northern Areas✔️
Sindh

Correct Answer Logic:

Satpara Dam was constructed on the Satpara stream near Skardu in the Northern Areas (now Gilgit-Baltistan) of Pakistan.

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English QUESTION #7638

Question 373

Change the voice: When will you buy a car?

When will a car be bought by you?✔️
When a car will be bought by you?
When will be a car bought by you?
None of these

Correct Answer Logic:

In interrogative sentences, when changing to passive voice, the question word remains at the beginning. The structure is: Question word + will + object + be + past participle + by + subject. Therefore, 'When will you buy' becomes 'When will be bought by you'.

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