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Maths QUESTION #2899

Question 1821

Difference between compound and simple interest on $\$100$ at $10\%$ for $2$ years is:

$\$0$
$\$1$✔️
$\$2$
$\$5$

Correct Answer Logic:

S.I. $= 20$. C.I. $= 100(1.1)^2 - 100 = 21$. Difference $= 1$.

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General Knowledge QUESTION #4656

Question 1822

Advertising rose 20% while garment consumption rose 25%. All explain this EXCEPT:

Per capita consumption of unstitched garments declined✔️
Advertising effectiveness increased
Sewing machine production doubled
Readymade garments were available in more shops

Correct Answer Logic:

No explanation provided for this question.

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Boilers Mechanical Engineering QUESTION #2521

Question 1823

D'Alembert's principle converts a dynamics problem into an equivalent statics problem by introducing:

A fictitious potential energy
An inertial force $-m\mathbf{a}$ applied to the body so that $\sum\mathbf{F}-m\mathbf{a}=0$✔️
The work done by the net force
The angular momentum about the center of mass

Correct Answer Logic:

D'Alembert's principle: by adding the inertial force $-m\mathbf{a}$ to the real forces, the equation $\sum\mathbf{F}=m\mathbf{a}$ becomes $\sum\mathbf{F}+(-m\mathbf{a})=0$, which has the form of a static equilibrium equation.

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Physics QUESTION #7342

Question 1824

A projectile has initial velocity $(2\hat{i}+3\hat{j})\text{ m/s}$ at point A (at ground level). At point B (on the x-axis, same height as A), its velocity is:

$2\hat{i}+3\hat{j}$
$-2\hat{i}-3\hat{j}$
$-2\hat{i}+3\hat{j}$
$2\hat{i}-3\hat{j}$✔️

Correct Answer Logic:

Horizontal component is unchanged throughout: $v_x = 2\text{ m/s}$.

When the projectile returns to the same height, the vertical component reverses: $v_y = -3\text{ m/s}$.

Velocity at B $= \mathbf{2\hat{i} - 3\hat{j}}$

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Political Science QUESTION #6679

Question 1825

The French President is elected by:

Lower House
Popular Vote✔️
Parliament
Upper House

Correct Answer Logic:

Since 1962, the President of the French Republic is elected directly by universal suffrage (popular vote).

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Security Measures to Maintain Law and Order QUESTION #849

Question 1826

The rank of "Assistant Director" in ASF is equivalent to which military rank for administrative purposes?

Captain
Major✔️
Lieutenant
Colonel

Correct Answer Logic:

Per Section 3, an Assistant Director is equivalent to a Captain (while Deputy Director is Major).

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Mathematics QUESTION #1260

Question 1827

The dimension of the subspace $W$ of all symmetric $2\times 2$ matrices (as a subspace of the vector space of all $2\times 2$ matrices) is:

1
2
3✔️
4

Correct Answer Logic:

A general symmetric $2\times2$ matrix has the form $\begin{pmatrix}a&b\\b&c\end{pmatrix}$ with 3 free parameters $a,b,c$. A basis is: $\left\{\begin{pmatrix}1&0\\0&0\end{pmatrix},\begin{pmatrix}0&1\\1&0\end{pmatrix},\begin{pmatrix}0&0\\0&1\end{pmatrix}\right\}$. So $\dim(W)=3$.

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Pakistan Affairs QUESTION #9089

Question 1828

To the south of Pakistan lies which body of water?

China
Iran
Afghanistan
The Arabian Sea✔️

Correct Answer Logic:

The Arabian Sea is to the south.

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Reading and Writing (Module-1) QUESTION #5327

Question 1829

Regarding the bioluminescent jellyfish, when does the glow typically occur?

When the jellyfish is disturbed by a predator.✔️
During the daylight hours.
Continuously throughout the night.
Only when the water temperature rises.

Correct Answer Logic:

The text specifies the glow happens when the organism is 'disturbed.'

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Paper-II (Pharmacognosy and Pharmaceutics-I) QUESTION #3656

Question 1830

'Caffeine' is a purine derivative found in:

Tea and Coffee✔️
Apples
Potatoes
Carrots

Correct Answer Logic:

Tea (Thea sinensis) and Coffee (Coffea arabica) are major sources.

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Dairy Food Science and Technology QUESTION #5936

Question 1831

The purpose of 'aging' (tempering) cream at $8\text{–}13^{\circ}\text{C}$ before churning in butter production is to:

Increase the cream's water content
Promote partial crystallization of fat into stable polymorphic crystal forms ($\beta'$) to facilitate efficient churning and improve butter texture✔️
Lower the cream's viscosity for better separation
Allow lactose to ferment producing diacetyl

Correct Answer Logic:

Cream tempering involves temperature cycling to promote formation of stable $\beta'$ and $\beta$ polymorphic crystal forms of triglycerides. Properly crystallized fat churns efficiently and produces butter with good texture, spreadability, and body.

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Math Physics Chemistry Biology QUESTION #4329

Question 1832

Which of the following best describes 'acquired characteristics' according to Lamarckism?

Traits caused by mutation
Traits inherited from parents
Traits developed by use or disuse✔️
Traits selected by nature

Correct Answer Logic:

According to Lamarck, acquired characteristics are traits developed during an organism's lifetime through use or disuse of organs, and these are then passed to offspring.

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MCQs Section QUESTION #5171

Question 1833

'بالا بیکا کرنا' محاورے کا مطلب ہے:

بال کی کھال اتارنا
کتربیونت کرنا✔️
فائدہ پہنچانا
ان میں سے کوئی نہیں

Correct Answer Logic:

بالا بیکا کرنا محاورے کا مطلب ہے کتربیونت کرنا یا بلا وجہ تفریق کرنا (اصل میں نقصان پہنچانا بھی ہوتا ہے مگر یہاں آپشن 1 ہی بنتا ہے)۔

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Aptitude QUESTION #10989

Question 1834

A solid cylinder of radius $R$ and height $\frac{R}{2}$ is melted and recast into $N$ identical solid spheres. If the total surface area of all spheres equals the total surface area of the original cylinder, what is $N$?

$2$
$3$✔️
$4$
$6$

Correct Answer Logic:

Volume of cylinder: $V_c = \pi R^2 \cdot \frac{R}{2} = \frac{\pi R^3}{2}$. Volume of $N$ spheres: $N \cdot \frac{4}{3}\pi r^3 = \frac{\pi R^3}{2}$, so $Nr^3 = \frac{3R^3}{8}$. Surface area of cylinder: $SA_c = 2\pi R^2 + 2\pi R \cdot \frac{R}{2} = 3\pi R^2$. Surface area of $N$ spheres: $N \cdot 4\pi r^2 = 3\pi R^2$, so $Nr^2 = \frac{3R^2}{4}$. Dividing: $r = \frac{3R^3/8}{3R^2/4} = \frac{R}{2}$. Substituting: $N \cdot \frac{R^2}{4} = \frac{3R^2}{4}$, giving $N = 3$.

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Agronomy QUESTION #2102

Question 1835

Seed priming is an agronomic technique that improves crop establishment by:

Coating seeds with systemic fungicides to prevent seed-borne diseases during germination
Controlled hydration of seeds to a water potential that allows pre-germinative metabolic activity (DNA repair, enzyme activation, osmoprotectant synthesis) to proceed without radicle emergence, followed by re-drying — resulting in faster, more uniform germination and emergence under field stress conditions✔️
Exposing seeds to gamma radiation to induce beneficial mutations for stress tolerance
Treating seeds with growth regulators to extend their storage life and viability

Correct Answer Logic:

Seed priming (hydropriming, osmopriming with PEG, halopriming with KNO₃/KH₂PO₄, or biopriming with PGPR) allows seeds to advance through Phase I (imbibition) and Phase II (metabolic activity) of germination without entering Phase III (radicle emergence). Benefits: faster mean germination time, improved uniformity, enhanced stress tolerance, and better seedling vigor — particularly valuable for establishment in cold, saline, or drought-prone soils.

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Bio-Technology QUESTION #10617

Question 1836

Monoclonal antibodies (mAbs) are produced by hybridoma technology, which involves:

Immunising mice and isolating serum containing a mixture of all antibodies produced
Fusing antigen-specific B lymphocytes with immortal myeloma cells to create stable, antibody-secreting hybridomas✔️
Cloning antibody genes into phage display vectors for in vitro selection
Chemical conjugation of multiple antibody fragments to increase avidity

Correct Answer Logic:

Hybridoma technology (Köhler and Milstein, 1975 — Nobel Prize 1984) involves: (1) immunising a mouse with the target antigen, (2) isolating antigen-specific splenic B cells, (3) fusing B cells with myeloma cells (immortal, non-secreting) using PEG, (4) selecting hybridomas in HAT medium (unfused myeloma cells die; unfused B cells die naturally), (5) cloning and screening for the desired antibody specificity. Each hybridoma produces a single, uniform monoclonal antibody.

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Islamic Studies QUESTION #7930

Question 1837

In which night the Quran was revealed?

Shab-e-Miraj
Lailat-ul-Qadr✔️
Lail-tul-Aroos
Shab-e-Barat

Correct Answer Logic:

The Quran was revealed on Laylat al-Qadr (The Night of Power), which falls in the last ten nights of Ramadan, most likely the 27th night. This night is described in Surah Al-Qadr as 'better than a thousand months.' The entire Quran was sent down from Lauh al-Mahfuz to the lowest heaven on this night, then revealed gradually to the Prophet over 23 years.

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Boilers Mechanical Engineering QUESTION #3990

Question 1838

A 'Safety Valve' must be set to open at a pressure:

Slightly below the working pressure
Exactly at the working pressure
Slightly above the working pressure but not exceeding the design limit✔️
Double the working pressure

Correct Answer Logic:

It acts as a relief valve to prevent the boiler from exceeding its maximum allowable working pressure (MAWP).

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General Knowledge QUESTION #11519

Question 1839

The standard layout of keys on standard computer keyboards is known as:

Home layout
QWERTY layout✔️
Basic layout
General layout

Correct Answer Logic:

The standard keyboard layout is called QWERTY, named after the first six letters in the top row. Designed by Christopher Sholes in 1873, QWERTY was originally arranged to prevent mechanical jamming on typewriters. Alternative layouts include Dvorak and Colemak.

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Paper-II (Pharmacognosy and Pharmaceutics-I) QUESTION #3596

Question 1840

'Senna' and 'Aloe' belong to which chemical class of glycosides?

Saponin Glycosides
Anthraquinone Glycosides✔️
Cardiac Glycosides
Cyanophore Glycosides

Correct Answer Logic:

Anthraquinone glycosides are well known for their stimulant laxative properties.

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