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Chemistry QUESTION #7128

Which of the following reagent systems is specifically used to produce trans-alkenes from the reduction of alkynes?

$H_{2}$ with $Pd/C$ and $BaSO_{4}$
$NaBH_{4}$
$Na$ in liquid $NH_{3}$✔️
$Sn$ and $HCl$

Correct Answer Logic:

The reduction of non-terminal alkynes using sodium ($Na$) or lithium ($Li$) in liquid ammonia ($NH_3$) follows a free-radical mechanism that leads to the formation of the more stable trans-alkene (Birch reduction). Conversely, Lindlar's catalyst ($H_2, Pd/C, BaSO_4$) would yield a cis-alkene.

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Paper-I (Anatomy/Physiology and Biochemistry/Microbiology) QUESTION #3358

Question 3362

'Binary Fission' is the primary method of reproduction for:

Viruses
Bacteria✔️
Fungi
Humans

Correct Answer Logic:

A single cell splits into two identical daughter cells.

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Paper-I (Anatomy/Physiology and Biochemistry/Microbiology) QUESTION #3156

Question 3363

Which organ is most active in children for the 'T-cell' maturation and immune development?

Spleen
Thymus✔️
Tonsils
Appendix

Correct Answer Logic:

The thymus gland shrinks (atrophies) after puberty.

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Mathematics QUESTION #1321

Question 3364

The area enclosed between two curves $y=f(x)$ and $y=g(x)$ where $f(x)\geq g(x)$ on $[a,b]$ is given by:

$\int_a^b[f(x)+g(x)]\,dx$
$\int_a^b[f(x)-g(x)]\,dx$✔️
$\int_a^b[f(x)\cdot g(x)]\,dx$
$\dfrac{1}{2}\int_a^b[f(x)-g(x)]\,dx$

Correct Answer Logic:

The area between two curves is the integral of the top curve minus the bottom curve: $A=\int_a^b[f(x)-g(x)]\,dx$ where $f(x)\geq g(x)$ on $[a,b]$. The limits $a$ and $b$ are the $x$-coordinates of the intersection points.

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General Knowledge QUESTION #8948

Question 3365

The world's largest number of newspapers are published in which country?

America
China
Russia
India✔️

Correct Answer Logic:

India publishes the most daily newspapers.

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Chemistry QUESTION #5522

Question 3366

Two water samples A and B have BOD (Biochemical Oxygen Demand) values of 10 and 20, respectively. Which statement is correct?

B is more polluted than A.✔️
A is fit for drinking, whereas B is not.
Both A and B are suitable for drinking.
A is more polluted than B.

Correct Answer Logic:

BOD (Biochemical Oxygen Demand) measures the amount of dissolved oxygen needed by microorganisms to decompose organic matter. A higher BOD means more organic pollution. Since BOD of B (20) > BOD of A (10), water B is more polluted. Note: For drinking water, BOD should be less than 5 ppm; both A and B are unsuitable for drinking.

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General Knowledge QUESTION #168

Question 3367

The concept of Ijma’a follows the principle of agreement by:

51%
66%
100%
None of these✔️

Correct Answer Logic:

Traditionally, Ijma’a refers to the total consensus (unanimity) of Islamic scholars.

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General Ability and Fire Fighting QUESTION #5632

Question 3368

Which of the following describes a 'firebreak' as a firefighting technique?

A chemical barrier sprayed ahead of a fire
A physical gap created by clearing combustible material to stop fire spread✔️
A water curtain created by hoses
A foam barrier applied around a structure

Correct Answer Logic:

A firebreak is created by physically clearing or removing combustible material (trees

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Accounting & Finance QUESTION #6221

Question 3369

The 'Expectation Gap' often arises because the public confuses auditing with accounting. Which statement best distinguishes the two?

Auditing is done by directors; Accounting is done by Chartered Accountants
Accounting is the process of recording data; Auditing is the independent examination of that data✔️
Accounting provides an opinion; Auditing provides the facts
There is no distinction; they are the same activity

Correct Answer Logic:

Accounting is the systematic recording and reporting of financial info, while auditing is the concern with whether that info reflects a true and fair view.

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English QUESTION #8584

Question 3370

Which leader of Tamil Nadu died in 2016?

Jayalalithaa✔️
Binari
Sonubhai
Kaleeho

Correct Answer Logic:

Jayalalithaa died in December 2016.

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Physics QUESTION #7061

Question 3371

An ideal gas occupies $2 \text{ m}^3$ at a pressure of $3 \times 10^6 \text{ Pa}$. Determine the internal energy of the gas.

$9 \times 10^6 \text{ J}$✔️
$6 \times 10^4 \text{ J}$
$10^8 \text{ J}$
$3 \times 10^2 \text{ J}$

Correct Answer Logic:

Assuming the gas is monoatomic (as is standard in such problems unless specified otherwise), the internal energy $U$ is given by:

$U = \frac{3}{2} nRT = \frac{3}{2} PV$

$U = \frac{3}{2} \times (3 \times 10^6 \text{ Pa}) \times (2 \text{ m}^3)$

$U = 3 \times 3 \times 10^6 = 9 \times 10^6 \text{ J}$.

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Urdu QUESTION #5259

Question 3372

Idiom Through Thick and Thin کا درست مطلب:

ہر مشکل میں
اچھے برے وقت میں✔️
ہر حال میں
چھوٹی بڑی باتیں

Correct Answer Logic:

Through thick and thin کا مطلب ہے ہر اچھے اور برے وقت میں ساتھ دینا۔

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Urdu QUESTION #5126

Question 3373

وہ صنفِ سخن کیا ہے جس کے ہر بند میں دونوں مصرعے ہم قافیہ ہوں اور ہر دوسرے شعر میں قافیہ بدل جائے؟

مسدس
مثنوی✔️
مخمس
ان میں سے کوئی نہیں

Correct Answer Logic:

مثنوی وہ نظم ہے جس میں ہر شعر کے دونوں مصرعے ہم قافیہ ہوں اور ہر شعر میں قافیہ بدل جائے۔

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Education QUESTION #6733

Question 3374

The concept of 'scaffolding' in instruction means:

Permanent support for all learners
Temporary support gradually removed as student competence increases✔️
Physical classroom structures
Rigid instructional sequences

Correct Answer Logic:

Scaffolding (Vygotsky) involves providing temporary support that's gradually withdrawn as learners develop independence. Like construction scaffolding, instructional scaffolds are temporary structures that enable learners to accomplish tasks beyond current independent capability, then are removed.

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English QUESTION #8479

Question 3375

Select the word OPPOSITE in meaning to: Ominous

Threatening
Promising✔️
Docile
Menacing

Correct Answer Logic:

Ominous means threatening or foreshadowing evil; opposite is promising.

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Education QUESTION #7590

Question 3376

Which assessment focuses on measuring what students can actually do rather than simply recall facts?

Performance-based assessment✔️
Objective test
Oral test
Short-answer test

Correct Answer Logic:

Performance-based assessment requires students to demonstrate skills through actual tasks or activities, showing application rather than just factual recall.

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Mathematics QUESTION #6044

Question 3377

Let $O$ be the vertex and $Q$ any point on the parabola $x^2=8y$. If point $P$ divides segment $OQ$ internally in the ratio $1:3$, find the locus of $P$.

$x^2=y$
$y^2=x$
$y^2=2x$
$x^2=2y$✔️

Correct Answer Logic:

Let $Q=(4t, 2t^2)$ be a point on $x^2=8y$ (using parametrization $x=4t, y=2t^2$). $O=(0,0)$.

$P$ divides $OQ$ in ratio $1:3$: $P=\left(\frac{1\cdot4t+3\cdot0}{4},\frac{1\cdot2t^2+3\cdot0}{4}\right)=\left(t,\frac{t^2}{2}\right)$

Let $P=(h,k)$: $h=t$ and $k=\frac{t^2}{2}=\frac{h^2}{2}$

So $h^2=2k$, i.e., the locus is $x^2=2y$.

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General Abilities QUESTION #2806

Question 3378

Simplify: $\dfrac{-18 \times 5 + (-3) \times (-4)}{-6}$

12
13✔️
13.5
14

Correct Answer Logic:

$-18 \times 5 = -90$ and $(-3) \times (-4) = +12$. So numerator $= -90 + 12 = -78$. Then $\dfrac{-78}{-6} = 13$.

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Political Science QUESTION #6685

Question 3379

Which institution is responsible for interpreting the Constitution in Pakistan?

Parliament
Supreme Court✔️
President
None of these

Correct Answer Logic:

The Supreme Court of Pakistan is the final arbiter and interpreter of the Constitution.

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Accounting & Finance QUESTION #9659

Question 3380

A firm's goods are sold at a margin of 25% on sales. Purchases = Rs. 155,000; Opening Stock = Rs. 10,000; Closing Stock = Rs. 15,000. What are total Sales?

Rs. 200,000✔️
Rs. 150,000
Rs. 187,500
Rs. 175,000

Correct Answer Logic:

COGS = 10,000 + 155,000 – 15,000 = Rs. 150,000. Margin = 25%, so COGS = 75% of Sales. Sales = 150,000 × 100/75 = Rs. 200,000. The margin formula: Sales = COGS/(1 – Margin%) = 150,000/0.75.

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