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Multivariate calibration in chemometrics uses multiple independent variables (e.g., spectral data at multiple wavelengths) simultaneously to build predictive models for dependent variables (e.g., concentration). Techniques like Principal Component Regression (PCR) and Partial Least Squares (PLS) are commonly used. It goes beyond simple univariate regression.

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Paper-II (Pharmacognosy and Pharmaceutics-I) QUESTION #3648

Question 4

'Cannabis' (Charas/Hashish) is obtained from:

Cannabis sativa✔️
Papaver somniferum
Nicotiana tabacum
Atropa belladonna

Correct Answer Logic:

Cannabis is used for its resinous flowering tops.

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Reading and Writing (Module-1) QUESTION #5398

Question 5

The following text is from Walt Whitman's 1860 poem "Calamus 24." I HEAR it is charged against me that I seek to destroy institutions; / But really I am neither for nor against institutions / (What indeed have I in common with them?— / Or what with the destruction of them?), / Only I will establish in the Mannahatta [Manhattan] and in every city of These States, inland and seaboard, / And in the fields and woods, and above every keel [ship] little or large, that dents the water, / Without edifices, or rules, or trustees, or any argument, / The institution of the dear love of comrades. Which choice best describes the overall structure of the text?

The speaker questions an increasingly prevalent attitude then summarizes his worldview.
The speaker regrets his isolation from others then predicts a profound change in society.
The speaker concedes his personal shortcomings then boasts of his many achievements.
The speaker addresses a criticism leveled against him then announces a grand ambition of his.✔️

Correct Answer Logic:

The speaker first addresses accusations that he seeks to destroy institutions, then declares his goal to establish 'the institution of the dear love of comrades' everywhere.

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Education QUESTION #1474

Question 6

According to Abd Halim Hj. Mat Diah (1989), Islamic education is a process that shapes Muslims based on:

The teachings of philosophers
The teachings of Islam✔️
The teachings of caliphs
The teachings of scientists

Correct Answer Logic:

Abd Halim Hj. Mat Diah defined Islamic education as a process for all under the purposeful guidance of educators who shape Muslims based on the teachings of Islam.

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Biology QUESTION #4180

Question 7

The envelop in a virus is derived from

Host cell ribosomes
Host cell membrane✔️
Viral capsid proteins
Viral genome replication

Correct Answer Logic:

The viral envelope is derived from the host cell membrane during budding.

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Urdu QUESTION #5175

Question 8

درج ذیل میں سے کون سی شخصیت اقبال شناس شاعر تھی؟

نیاز فتح پوری
مستنصر حسین تارڑ
رفیع الدین ہاشمی✔️
وزیر آغا

Correct Answer Logic:

رفیع الدین ہاشمی ایک معروف اقبال شناس محقق اور ناقد ہیں جنہوں نے اقبال پر بہت کام کیا۔

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Paper-II (Pharmacognosy and Pharmaceutics-I) QUESTION #3608

Question 9

'Nutgall' (Quercus infectoria) is a rich source of:

Alkaloids
Tannic acid✔️
Volatile oil
Starch

Correct Answer Logic:

Galls are pathological outgrowths rich in gallotannic acid.

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Mechanical Engineering QUESTION #2536

Question 10

A force \(\mathbf{F} = 3\hat{i} + 4\hat{j}\) N acts at point \(P(2,\,1,\,0)\) m. The moment vector about the origin is:

\(5\hat{k}\) N·m✔️
\(-5\hat{k}\) N·m
\(8\hat{k}\) N·m
\(2\hat{k}\) N·m

Correct Answer Logic:

Moment \(\mathbf{M}=\mathbf{r}\times\mathbf{F}=(2\hat{i}+\hat{j})\times(3\hat{i}+4\hat{j})\). Cross product: \((2\cdot4-1\cdot3)\hat{k}=(8-3)\hat{k}=5\hat{k}\) N·m.

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Urdu QUESTION #5291

Question 11

اردو شعراء میں سب سے پہلے تصوف کس کے ہاں ملتا ہے؟

ذوق
میر درد✔️
غالب
مومن

Correct Answer Logic:

اردو شاعری میں تصوف سب سے پہلے خواجہ میر درد کے ہاں ملتا ہے جو دہلی کے بڑے صوفی شاعر تھے۔

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City and Regional Planning QUESTION #5011

Question 12

What is the primary principle behind Christopher Alexander's 'Pattern Language'?

Top-down master planning
Standardized building codes
Repeatable design solutions to common problems✔️
Minimalist architecture

Correct Answer Logic:

'A Pattern Language' (1977) presents 253 interconnected design patterns—proven solutions to recurring spatial and social problems at scales from regions to building details—enabling participatory, incremental development rather than comprehensive top-down planning.

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Physics QUESTION #388

Question 13

The angular frequency of simple pendulum is directly proportional to __________

l
1/l
?l
?(1/l)✔️

Correct Answer Logic:

? ? ?(g/l) = ?(1/l)

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Paper-I (Anatomy/Physiology and Biochemistry/Microbiology) QUESTION #3414

Question 14

Water is considered a 'Polar Solvent' because:

It is found at the poles
It has a partial positive and partial negative charge✔️
It is very cold
It does not mix with anything

Correct Answer Logic:

The oxygen atom is electronegative, creating a dipole.

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Agronomy QUESTION #2050

Question 15

Mode of action classification of herbicides is agronomically important because:

It determines the cost of herbicide application per unit area
Rotating herbicides with different modes of action is the primary strategy for delaying the evolution of herbicide-resistant weed populations✔️
It determines the withholding period before crop harvest
It identifies which herbicides can be mixed with fertilizers

Correct Answer Logic:

Herbicide resistance evolves when the same mode of action (MOA) is repeatedly used, selecting for resistant biotypes. Rotating herbicides across different MOA groups (HRAC/WSSA classification) prevents any single resistant genotype from dominating the weed population — the cornerstone of resistance management in modern weed science.

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Chemistry QUESTION #1439

Question 16

An allosteric enzyme:

Follows Michaelis-Menten kinetics
Is regulated by molecules that bind to a site other than the active site✔️
Is always inhibited by competitive inhibitors
None of these

Correct Answer Logic:

Allosteric enzymes are regulated by effector molecules (activators or inhibitors) that bind to a site other than the active site — the allosteric site. This binding causes conformational changes that alter enzyme activity. Allosteric enzymes do NOT follow standard Michaelis-Menten kinetics; instead, they show sigmoidal (cooperative) kinetics. They are key regulatory enzymes in metabolic pathways.

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Others section QUESTION #4762

Question 17

Which major international organization lacks a formal permanent structure and secretariat?

Greenpeace
D-8
G-8✔️
WTO

Correct Answer Logic:

The G-8 (Group of Eight) operates without a formal secretariat or permanent headquarters. The presidency rotates annually among member countries who host the summit.

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Economics QUESTION #1707

Question 18

Estimates of Pakistan's informal (shadow) economy as a share of GDP — encompassing undocumented production, unregistered enterprises, and unreported transactions — cluster around which approximate range?

10–20% of GDP
30–40% of GDP✔️
45–55% of GDP
None of these

Correct Answer Logic:

Multiple estimates — including those by the State Bank of Pakistan, FBR, and independent researchers — place Pakistan's informal economy at roughly 30–40% of GDP. The World Bank and IMF have cited figures in the 35–40% range. This large shadow economy severely constrains tax collection, distorts official statistics, and reduces the effectiveness of macroeconomic policy. Options (A) and (C) understate and overstate, respectively.

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