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UDC was originally developed by Paul Otlet and Henri La Fontaine as an extension of the Dewey Decimal Classification. It adds common and special auxiliary tables using symbols to combine and specify subjects with greater precision.

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Aptitude QUESTION #11045

Question 1644

A cube has its faces numbered $1$ to $6$. Face $1$ is opposite face $6$, face $2$ is opposite face $5$, and face $3$ is opposite face $4$. If the cube is rolled so that face $4$ moves to the top position, which face is now at the bottom?

$1$
$3$✔️
$4$
$6$

Correct Answer Logic:

Since face $3$ is opposite face $4$, when face $4$ is on top, face $3$ must be at the bottom.

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Islamic Studies QUESTION #8247

Question 1645

Which one of these is a Modni Surah?

Al-Namal
Al-Qasas
Al-Baqarah✔️
Al-Luqman

Correct Answer Logic:

Surah Al-Baqarah is a Madani Surah (revealed in Medina). Madani Surahs were revealed after the Hijrah and typically deal with legal, social, and community matters. Surah Al-Baqarah is the longest Surah with 286 verses and covers various topics including laws of marriage, divorce, inheritance, fasting, Hajj, and jihad. Al-Namal, Al-Qasas, and Al-Luqman are all Makki Surahs revealed in Makkah before the migration.

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General Knowledge QUESTION #4760

Question 1646

Ringgit is the currency unit of which country?

Singapore
Philippines
Malaysia✔️
Indonesia

Correct Answer Logic:

The Malaysian Ringgit (MYR) is the official currency of Malaysia, introduced in 1967 when the country separated from the shared Malayan dollar.

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Chemistry QUESTION #5553

Question 1647

According to Molecular Orbital Theory, which statement correctly describes $Li_2^+$ and $Li_2^-$?

$Li_2^+$ is unstable and $Li_2^-$ is stable
$Li_2^+$ is stable and $Li_2^-$ is unstable
Both are stable✔️
Both are unstable

Correct Answer Logic:

$Li_2^+$ bond order = $\frac{1}{2}(3-2) = 0.5 > 0$ → stable. $Li_2^-$ bond order = $\frac{1}{2}(4-3) = 0.5 > 0$ → stable. Both species have positive bond orders and can exist as stable (though weakly bonded) species.

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Molecular Biology / Bioinformatics / Biochemistry QUESTION #11058

Question 1648

The estimated number of alveoli in the human lungs is approximately:

150 million
500 million✔️
600 million
1 billion

Correct Answer Logic:

The human lungs contain approximately 500 million alveoli (range: 200–600 million), providing a total gas exchange surface area of ~70–100 m² — roughly the size of a tennis court. Each alveolus is a tiny air sac (~200–300 μm diameter) surrounded by capillaries. This enormous surface area, combined with the very thin alveolar-capillary membrane (~0.5 μm), enables efficient O₂/CO₂ exchange between air and blood.

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Molecular Biology / Bioinformatics / Biochemistry QUESTION #11125

Question 1649

In the evolution of modern humans (Homo sapiens) from ancestors, the most significant evolutionary trend is:

Increasing cranial capacity✔️
Development of upright posture
Shortening of jaws
Development of binocular vision

Correct Answer Logic:

The most significant trend in human evolution is the dramatic increase in cranial capacity (brain size) — from ~450 cm³ in Australopithecus to ~1350–1500 cm³ in modern Homo sapiens. This expansion of the neocortex enabled language, abstract reasoning, tool use, social organisation, and cultural transmission — the defining features of humanity. Upright posture evolved earlier (in Australopithecus); binocular vision is a primate trait; jaw reduction is a consequence of dietary changes and reduced dentition.

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Contracts QUESTION #5856

Question 1650

An Owner leaves a watch at a Jewelry Store for repair. The Jeweler (who also sells watches) accidentally sells it to a regular customer. Can the Owner get the watch back from the customer?

Yes, because the Jeweler didn't own the watch.
No, the customer is a 'Buyer in the Ordinary Course of Business'.✔️
Yes, because the customer should have checked the serial number.
No, unless the customer knew the watch was used.

Correct Answer Logic:

Under the 'Entrustment Rule' (UCC §2-403(2)), entrusting goods to a merchant who deals in goods of that kind gives the merchant power to transfer all rights to a buyer in the ordinary course of business.

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MCQs Section QUESTION #4467

Question 1651

چراغ پا ہونا محاورہ ہے اس کا مفہوم کیا ہے؟ (What is the meaning of the idiom 'Charagh pa hona'?)

غصے کی کیفیت✔️
روشنی بکھیرنا
خوشیاں بانٹنا
کھڑا رہنا

Correct Answer Logic:

'Charagh pa hona' is an idiom meaning to become extremely angry or enraged.

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Political Science QUESTION #6678

Question 1652

What is the highest source of Legal Authority in the UK?

The Prime Minister
The Constitution
Parliament✔️
None of these

Correct Answer Logic:

Under the doctrine of Parliamentary Sovereignty, the UK Parliament is the supreme legal authority.

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Mathematics QUESTION #4099

Question 1653

On the contour segment from $A=(0+i)$ to $B=(1+i)$ (where $y=1$, $x:0\to1$, $dZ=dx$), with $f(Z)=y-x-3ix^2$, the contribution to the contour integral is:

$\dfrac{1}{2}-i$✔️
$-\dfrac{1}{2}+i$
$1-i$
$\dfrac{1}{2}-\dfrac{i}{2}$

Correct Answer Logic:

On $AB$: $y=1$, $Z=x+i$, $dZ=dx$, $f=1-x-3ix^2$. Integral: $\int_0^1(1-x-3ix^2)dx = \left[x-\dfrac{x^2}{2}-ix^3\right]_0^1 = 1-\dfrac{1}{2}-i = \dfrac{1}{2}-i$.

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Accounting Finance and Punjab Sales Tax on Services QUESTION #2571

Question 1654

Under section 52(2)(b), a notice for recovery of a refund that was not due (obtained through fraud, forgery, false documents etc.) must be served within:

Three years from the date of receipt of refund
Five years from the end of the financial year in which the refund was received✔️
Eight years of the relevant tax period
Ten years from the date of erroneous refund

Correct Answer Logic:

Section 52(2)(b) as amended by Punjab Finance Act, 2022 provides that the show-cause notice for recovery of wrongly obtained refund must be issued within FIVE YEARS FROM THE END OF THE FINANCIAL YEAR IN WHICH THE REFUND WAS RECEIVED.

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Boilers Mechanical Engineering QUESTION #4015

Question 1655

'Low Water Cut-Off' (LWCO) is an electrical device that:

Starts the pump
Shuts down the fuel supply if water falls to a dangerous level✔️
Measures the $pH$ of water
Cleans the tubes

Correct Answer Logic:

It is a primary safety device to prevent 'Dry Firing' the boiler.

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MCQs Section QUESTION #4843

Question 1656

Pick the word nearly opposite in meaning to "VALEDICTORY"

Farewell
Final
Hopeful✔️
Parting

Correct Answer Logic:

Valedictory means serving as a farewell or relating to departure. Its antonym is 'hopeful,' which conveys anticipation and expectation rather than departure or ending.

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