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Boilers Mechanical Engineering QUESTION #2452

For forced vibration isolation to be effective (transmissibility TR < 1), the frequency ratio $r = p/\omega_n$ must satisfy:

$r < 1$
$r = 1$
$r > \sqrt{2}$✔️
$r > 2$

Correct Answer Logic:

Isolation requires TR < 1, which occurs when $r=p/\omega_n>\sqrt{2}$. This means the machine operating speed $p$ must exceed $\sqrt{2}$ times the mounted natural frequency $\omega_n$.

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English Literature QUESTION #10724

Question 502

The word "Novel" is derived from the Italian word:

Novella
Novelle✔️
Novelette
Novel

Correct Answer Logic:

The English word 'novel' is derived from the Italian novelle (plural of novella), meaning 'new' or 'a new thing.' The term was applied to short prose tales in Italian literature, especially those in Boccaccio's Decameron. Over time, as the form grew longer and more complex in English (Defoe, Richardson, Fielding), 'novel' became the term for a full-length prose fiction narrative.

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Reading and Writing (Module-1) QUESTION #5453

Question 503

Notes: Todd Henry (1999) studied Sun and nearby stars within 10 parsecs. Sun = ~9,800?F (G star). 327 of 357 stars were K or M (cooler, <8,900?F). 11 were A or F (hotter, >10,300?F). Which choice emphasizes how hot the Sun is relative to nearby stars?

At ~9,800?F (G star), the Sun is hotter than most but not all stars within 10 parsecs.✔️
Todd Henry determined the Sun is a G star, and several other stars are A or F.
Of 357 stars within 10 parsecs of Sun, 327 are K or M (<8,900?F).
While most stars within 10 parsecs are K, M, A, or F, Sun is G star due to 9,800?F.

Correct Answer Logic:

Option A directly states "hotter than most but not all," which captures relative heat accurately.

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English QUESTION #4460

Question 504

Which of the following sentence is CORRECT?

Why industry and academia should collaborate to work on their programs?
Why academia and industry should work to collaborate on their programs?
Why industry and academia should work for the collaboration on their programs?
None of these✔️

Correct Answer Logic:

All options are incorrect because they are structured as statements rather than questions. A correct question would be: 'Why should industry and academia collaborate...?'

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English QUESTION #2787

Question 505

Choose the correct word: 'You must ___ to the terms of the contract.' (Note: 'Comply' means to act in accordance with; 'Imply' means to suggest indirectly)

Imply
Comply✔️
Reply
Apply

Correct Answer Logic:

'Comply' means to act in accordance with a wish, order, or rule. 'You must comply with the terms of the contract' is correct. 'Imply' means to suggest something indirectly, which doesn't fit here.

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Professional QUESTION #1842

Question 506

Under Section 19(3), a civil servant who is dismissed or removed from service for reasons of discipline is not admissible to pension. However, the Government may sanction compassionate allowance not exceeding what fraction of the pension or gratuity that would have been admissible?

One-half
Two-thirds✔️
Three-quarters
One-third

Correct Answer Logic:

Section 19(3) provides that no pension is admissible to a civil servant dismissed or removed for disciplinary reasons, but the Government may sanction compassionate allowance not exceeding two-thirds of the pension or gratuity which would have been admissible had he been invalided from service on the date of dismissal or removal.

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Maths QUESTION #4610

Question 507

Solve: $7 - 2x = 1$

$x = 3$✔️
$x = 4$
$x = -3$
$x = 6$

Correct Answer Logic:

$7 - 2x = 1 \Rightarrow -2x = -6 \Rightarrow x = 3$

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Mathematics QUESTION #1266

Question 508

For $f(x,y)=xy-2x$ on the triangular region with vertices $(0,0)$, $(4,0)$, $(0,4)$, the absolute minimum value is:

$-8$✔️
$0$
$-4$
$4$

Correct Answer Logic:

On boundary edge from $(0,0)$ to $(4,0)$ ($y=0$): $f=-2x$, minimum at $x=4$: $f=-8$. Interior critical point: $f_x=y-2=0\Rightarrow y=2$; $f_y=x=0\Rightarrow x=0$, giving $f(0,2)=0$. Checking all boundaries, the absolute minimum is $-8$ at $(4,0)$.

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Accounting & Finance QUESTION #6133

Question 509

A business charges straight-line depreciation on property. At the start of the year, the property was revalued upward with remaining useful life unchanged. What changes occur compared to the previous year?

Option	Carrying Value	Expenses (Depreciation)
A	Decrease	Decrease
B	Decrease	Increase
C	Increase	Decrease
D	Increase	Increase

Option A
Option B
Option C
Option D✔️

Correct Answer Logic:

Option D is correct.

Carrying value increases — asset recorded at the higher revalued amount.
Depreciation increases — higher value depreciated over same remaining life gives a larger annual charge.

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General Intelligence/Ability QUESTION #3978

Question 510

Determine which of the following mathematical expressions results in the largest value:

$4 \times \sqrt{4}$✔️
$4^2$
$4 \times 4 \times 4$
$\sqrt{4}$

Correct Answer Logic:

2

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Academic/Professional (Social Sciences) QUESTION #6492

Question 511

In sociology, 'Ethnocentrism' refers to:

Judging another culture by its own standards
Judging another culture by the standards of one's own culture✔️
The belief that all cultures are equal
The process of learning a new culture

Correct Answer Logic:

Ethnocentrism is the tendency to view one's own culture as superior and use it as a benchmark for others.

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Chemistry QUESTION #444

Question 512

Concentrated nitric acid gives __________ when it reacts with tin.

Nitric oxide
Meta stannic acid
Ammonium nitrite✔️
None of these

Correct Answer Logic:

Tin reacts with conc. HNO? to give metastannic acid

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Paper-II (Pharmacognosy and Pharmaceutics-I) QUESTION #3037

Question 513

'Autoclaving' uses which type of heat for sterilization?

Dry heat
Moist heat (Steam under pressure)✔️
Radiant heat
Chemical heat

Correct Answer Logic:

Autoclaving is the most effective method of moist heat sterilization.

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Electrical Engineering QUESTION #2192

Question 514

A DC shunt motor draws $I_L = 50\,\text{A}$ from $V = 220\,\text{V}$. Given $R_a = 0.4\,\Omega$ and $R_f = 110\,\Omega$, the back-EMF $E_b$ and mechanical power developed are:

$E_b \approx 200.8\,\text{V}$, $P_{mech} \approx 9{,}638\,\text{W}$✔️
$E_b = 220\,\text{V}$, $P_{mech} = 11{,}000\,\text{W}$
$E_b = 196\,\text{V}$, $P_{mech} = 9{,}800\,\text{W}$
$E_b = 218\,\text{V}$, $P_{mech} = 10{,}900\,\text{W}$

Correct Answer Logic:

$I_f = V/R_f = 220/110 = 2\,\text{A}$. $I_a = I_L - I_f = 48\,\text{A}$. $E_b = V - I_a R_a = 220 - 48\times0.4 = 200.8\,\text{V}$. $P_{mech} = E_b\times I_a = 200.8\times48 \approx 9{,}638\,\text{W}$.

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Physics QUESTION #7223

Question 515

The dimensions of the universal gravitational constant $G$ are:

$[ML^2T^{-1}]$
$[M^{-1}L^3T^{-2}]$✔️
$[M^{-1}L^2T^{-1}]$
$[M^{-1}L^3T^{-2}]$

Correct Answer Logic:

From Newton's law of gravitation: $F = \dfrac{Gm_1 m_2}{r^2}$

$[G] = \dfrac{[F][r^2]}{[m]^2} = \dfrac{MLT^{-2} \cdot L^2}{M^2} = M^{-1}L^3T^{-2}$

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Paper-I (Anatomy/Physiology and Biochemistry/Microbiology) QUESTION #3086

Question 516

The process of blood cell formation (Haematopoiesis) occurs in the:

Yellow bone marrow
Red bone marrow✔️
Periosteum
Articular cartilage

Correct Answer Logic:

Red bone marrow, found in spongy bone, is the site of red and white blood cell production.

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Civil / Architecture QUESTION #2362

Question 517

In earthquake engineering, the ductility demand $\mu$ of a structure is defined as the ratio of the maximum displacement $\Delta_{max}$ to the yield displacement $\Delta_y$. For a structure with a force reduction factor $R = 6$ designed using the equal energy principle (applicable for intermediate period structures), the relationship between $R$ and $\mu$ is approximately:

$R = \mu$
$R = \sqrt{2\mu - 1}$✔️
$R = \mu^2$
$R = 2\mu$

Correct Answer Logic:

The equal energy principle (Newmark-Hall approach for intermediate periods $0.1\,\text{s} < T < T_s$) gives $R = \sqrt{2\mu - 1}$. For long-period structures (equal displacement principle): $R = \mu$. For short-period structures (equal acceleration): $R = 1$ regardless of ductility. Understanding which principle applies determines the inelastic displacement demand in seismic design.

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English QUESTION #7554

Question 518

Translate into English: میں جانتا تھا کہ وہ وعدہ پورا نہیں کرے گا۔

I knew that he won’t keep his promise.
I knew that he would not keep his promise.✔️
I was knowing that he will not keep his promise.
I know he doesn’t keep his promise.

Correct Answer Logic:

The Urdu uses past tense "جانتا تھا" (knew) and future-in-past "کرے گا" (would not keep). Option B correctly uses "knew" + "would not keep."

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Geology QUESTION #10672

Question 519

The process by which unstable atomic nuclei spontaneously emit radiation and transform into different nuclides is termed:

Ionisation
Nuclear fusion
Nucleation
Radioactive decay✔️

Correct Answer Logic:

Radioactive decay (radioactivity) is the spontaneous transformation of an unstable atomic nucleus into a more stable configuration through emission of particles or energy: alpha decay ($\alpha$), beta decay ($\beta^-$, $\beta^+$), or gamma emission ($\gamma$). It follows first-order kinetics: $N(t) = N_0 e^{-\lambda t}$, where $\lambda$ is the decay constant and $t_{1/2} = \ln 2 / \lambda$. Radiometric dating methods (U-Pb, K-Ar, Rb-Sr) rely on known decay constants.

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MCQs Section QUESTION #5093

Question 520

ٹی وی کے مشہور ڈرامہ 'سونا چاندی' کے مصنف کا نام بتائیں۔

مانو بھائی
امجد اسلام امجد
ڈاکٹر انور سجاد
حسینہ معین✔️

Correct Answer Logic:

سونا چاندی ٹی وی ڈرامہ حسینہ معین نے لکھا جو پاکستان ٹیلی ویژن کا مشہور سلسلہ رہا۔

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