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Paper-I (Anatomy/Physiology and Biochemistry/Microbiology) QUESTION #3514

Question 4061

What is the biological source of 'Turmeric' (Haldi)?

Curcuma longa✔️
Zingiber officinale
Crocus sativus
Allium sativum

Correct Answer Logic:

Turmeric comes from the rhizomes of Curcuma longa.

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Agronomy QUESTION #2063

Question 4062

Iron (Fe) deficiency in crops most commonly occurs in:

Acidic, waterlogged, sandy soils with low pH
Calcareous (high pH, high CaCO₃) soils where Fe³⁺ is precipitated as insoluble Fe(OH)₃ or FeCO₃, making it unavailable despite adequate total soil Fe content✔️
Sandy soils with low organic matter in humid tropical climates
Highly acidic forest soils with high Al³⁺ saturation

Correct Answer Logic:

Iron deficiency (lime-induced chlorosis) is paradoxical — soils may contain abundant total Fe but at pH > 7.5, Fe³⁺ is precipitated as Fe(OH)₃ and FeCO₃ (solubility product exceeded). Plants, especially Strategy I species, cannot access precipitated Fe. Interveinal chlorosis of young leaves is diagnostic. Foliar FeSO₄ or chelated Fe (EDTA/EDDHA) corrects deficiency.

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Biology QUESTION #7274

Question 4063

Oxygenic photosynthesis occurs in:

Chlorobium
Chromatium
Oscillatoria✔️
Rhodospirillum

Correct Answer Logic:

Oscillatoria is a cyanobacterium that performs oxygenic photosynthesis — it uses water as the electron donor and releases O₂ as a byproduct, just like plants. Chlorobium (green sulfur bacteria), Chromatium (purple sulfur bacteria), and Rhodospirillum (purple non-sulfur bacteria) are anoxygenic photosynthesizers — they do not release oxygen.

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Education QUESTION #7579

Question 4064

The proposition that language shapes how individuals of a particular culture understand the world is known as which hypothesis?

Sapir-Whorf hypothesis✔️
Leah and Harry hypothesis
Brown and Gilman hypothesis
None of these

Correct Answer Logic:

The Sapir-Whorf hypothesis proposes linguistic relativity, suggesting that the structure of a language influences its speakers' worldview and cognition.

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Logical Reasoning QUESTION #3959

Question 4065

Select the pair with a similar relationship: OBSTRUCTION : BUOY

construction : building✔️
boy : girl
danger : red light
iceberg : titanic

Correct Answer Logic:

2

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Pakistan Affairs QUESTION #9029

Question 4066

Which Prime Minister of Pakistan had the shortest tenure?

Gen. Muhammad Ayub Khan
I.I. Chundrigar✔️
Malik Feroze Khan Noon
M. Ali Bogra

Correct Answer Logic:

I.I. Chundrigar served only about two months in 1957.

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Quantitative Reasoning QUESTION #7214

Question 4067

A recently released, praise-filled biography of George Bernard Shaw fails, much like its predecessors, to truly capture the essence of his personality: the more he is (i)_____, the more his true self seems to (ii)_____.

Blank (i)	Blank (ii)
A. discussed	D. disappear
B. disparaged	E. emerge
C. disregarded	F. coalesce

Blank (i) = discussed, Blank (ii) = disappear✔️
Blank (i) = disparaged, Blank (ii) = emerge
Blank (i) = disregarded, Blank (ii) = coalesce
Blank (i) = discussed, Blank (ii) = emerge

Correct Answer Logic:

The sentence says the biography is laudatory (full of praise) yet still fails to capture Shaw’s essence. The two blanks set up a paradox.

Blank (i): The biography is about Shaw — it discusses him. The more he is discussed, the more elusive his true self becomes. “Disparaged” or “disregarded” would not logically follow from a laudatory biography that is earnestly trying to capture his personality.

Blank (ii): The sentence sets up a paradox — more discussion leads to less understanding. So the true self must disappear (become harder to find), not emerge or coalesce.

“Emerge” would mean we understand him better — the opposite of the intended meaning.
“Coalesce” means to come together — also contradicts the idea of failing to capture his essence.

Correct Answers: Blank (i) = A (discussed), Blank (ii) = D (disappear).

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Boilers Mechanical Engineering QUESTION #4011

Question 4068

'Steam Quality' (Dryness Fraction) of $0.9$ means:

The steam is $100\%$ water
The steam contains $90\%$ dry steam and $10\%$ water droplets✔️
The steam is $90\%$ water
The steam is at $90~psi$

Correct Answer Logic:

Ideally, steam for turbines should be as dry as possible ($x \approx 1.0$).

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Boilers Mechanical Engineering QUESTION #2435

Question 4069

The undamped natural circular frequency $\omega_n$ of a spring-mass system (mass $m$, spring stiffness $k$) is:

$\omega_n = \sqrt{k/m}$✔️
$\omega_n = \sqrt{m/k}$
$\omega_n = k/m$
$\omega_n = 2\pi\sqrt{m/k}$

Correct Answer Logic:

From the equation of motion $m\ddot{x}+kx=0$, dividing by $m$ gives $\ddot{x}+\omega_n^2 x=0$ where $\omega_n^2=k/m$, hence $\omega_n=\sqrt{k/m}$ rad/s.

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Chemistry QUESTION #7514

Question 4070

A compound with molecular mass 180 is acylated with CH$_3$COCl to yield a compound with molecular mass 390. How many amino ($-\text{NH}_2$) groups does the original compound contain?

2
5✔️
4
6

Correct Answer Logic:

Acylation: each $-\text{NH}_2$ reacts with CH$_3$COCl to introduce a $-\text{COCH}_3$ group ($M = 42$) and release HCl.

Net mass added per amino group $= 42 - 1 = 42$ (the $-H$ is replaced by $-\text{COCH}_3$)

Wait — each NH$_2$ + CH$_3$COCl → NH$\cdot$COCH$_3$ + HCl. Mass change per group $= 42 - 1 = +41$... more precisely: $-NH_2$ (16) becomes $-NHCOCH_3$ (58): increase = 42.

Increase in mass $= 390 - 180 = 210$

Number of amino groups $= \dfrac{210}{42} = \mathbf{5}$

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Pakistan Affairs QUESTION #4679

Question 4071

Who served as the Special Representative of the United States for Afghanistan and Pakistan Affairs (SRAP)?

Richard Holbrooke✔️
Joan Elizabeth
Gen. MacArthur
George Mitchell

Correct Answer Logic:

Richard Holbrooke served as the first US Special Representative for Afghanistan and Pakistan (SRAP) from January 2009 until his death in December 2010.

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Psychology QUESTION #9939

Question 4072

Guilford's Structure of Intellect Model of intelligence is notable because:

It separates operations from content and product
It rejects the idea of a general factor
It yields 180 unique intellectual factors
All of these✔️

Correct Answer Logic:

Guilford's SOI model is notable for all three: systematically distinguishing operations, content, and product; explicitly rejecting Spearman's g-factor; and yielding up to 180 unique intellectual factors in its extended form.

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Paper-II (Pharmacology and Social Behaviour, Law & Ethics and Computer Sciences) QUESTION #5759

Question 4073

The mechanism of action for Tubocurarine involves:

Persistent depolarization
Irreversible inhibition of Acetylcholinesterase
Competitive blockade of nicotinic receptors✔️
Activation of Muscarinic receptors

Correct Answer Logic:

Tubocurarine is a non-depolarizing (competitive) blocker of nicotinic receptors.

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Islamic Studies QUESTION #7928

Question 4074

The incident of Karbala took place in:

70 AH
61 AH✔️
58 AH
65 AH

Correct Answer Logic:

The tragedy of Karbala occurred on 10th Muharram 61 AH (October 10, 680 CE). Hazrat Imam Hussain (RA), the grandson of Prophet Muhammad (PBUH), along with 72 companions, was martyred by the forces of Yazid. This event holds immense significance in Islamic history, especially for Shia Muslims, and is commemorated during Muharram.

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FIA Act QUESTION #9948

Question 4075

Besides territorial extent, the FIA Act also applies to citizens of Pakistan and public servants:

Only within Pakistan
Only in Islamabad
Wherever they may be✔️
Only in SAARC countries

Correct Answer Logic:

The Act applies to citizens and public servants 'wherever they may be'.

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Biology Zoology Botany QUESTION #1343

Question 4076

Erythropoietin, a hormone, is primarily produced by _________ and is involved for RBC production:

Liver
Kidney✔️
Leukocytes
None of these

Correct Answer Logic:

Erythropoietin (EPO) is a glycoprotein hormone primarily produced by peritubular interstitial cells in the cortex of the kidney (about 90%) in response to hypoxia (low oxygen levels). A small amount is produced in the liver. EPO stimulates the bone marrow to increase the production of red blood cells (erythropoiesis), thereby increasing oxygen-carrying capacity.

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MCQs Section QUESTION #4469

Question 4077

Translate: لاہور باغات کیلئے مشہور ہے۔ (Lahore is famous for gardens.)

Lahore was known for gardens.
Lahore will be known for gardens.
Lahore were known for gardens.
None of these✔️

Correct Answer Logic:

The original sentence is in the present tense ('hai'), while the options provided are in past or future tense. Therefore, 'None of these' is correct.

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Chemistry QUESTION #7110

Question 4078

Given the half-cell reactions:
1. $Mn^{2+} + 2e^{-} \rightarrow Mn$; $E^{0} = -1.18\text{ V}$
2. $Mn^{3+} + e^{-} \rightarrow Mn^{2+}$; $E^{0} = +1.51\text{ V}$
Determine the $E^{0}$ for the disproportionation reaction $3Mn^{2+} \rightarrow Mn + 2Mn^{3+}$ and its feasibility.

-0.33 V; non-spontaneous
-0.33 V; spontaneous
-2.69 V; non-spontaneous✔️
-2.69 V; spontaneous

Correct Answer Logic:

The target reaction is $3Mn^{2+} \rightarrow Mn + 2Mn^{3+}$. This is the sum of:
Reduction: $Mn^{2+} + 2e^{-} \rightarrow Mn$ ($E^{0}_{red} = -1.18\text{ V}$)
Oxidation: $2Mn^{2+} \rightarrow 2Mn^{3+} + 2e^{-}$ ($E^{0}_{ox} = -1.51\text{ V}$)
$E^{0}_{cell} = E^{0}_{cathode} - E^{0}_{anode} = -1.18 - 1.51 = -2.69\text{ V}$. Since $E^{0}_{cell}$ is negative, the reaction is non-spontaneous.

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