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English QUESTION #8286

Question 441

Choose the correct sentence:

India attacked on Pakistan in 1965.
India attacked Pakistan in 1965.✔️
India attacks Pakistan in 1965.
India did attacked on Pakistan in 1965.

Correct Answer Logic:

'Attack' is a transitive verb and does not require 'on'.

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Physics QUESTION #4383

Question 442

If two speakers emit sound at the same frequency and phase, maximum loudness occurs when:

Path difference $= \dfrac{\lambda}{2}$
Path difference $= \lambda$✔️
Path difference $= \dfrac{\lambda}{4}$
Path difference $= \dfrac{3\lambda}{4}$

Correct Answer Logic:

Maximum loudness (constructive interference) occurs when the path difference is a whole number multiple of wavelength: $\Delta x = n\lambda$ where $n = 0, 1, 2, ...$. For $n=1$, path difference $= \lambda$.

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Boilers Mechanical Engineering QUESTION #4024

Question 443

If the 'Water Level Indicator' glass breaks, the first action of the operator should be:

Run out of the room
Close the steam and water cocks of the gauge immediately✔️
Call the police
Increase the fuel flow

Correct Answer Logic:

Safety protocols require isolating the gauge to prevent steam burns and water loss.

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Civil / Architecture QUESTION #2337

Question 444

According to Darcy's law, the seepage quantity $Q$ through a soil sample of cross-sectional area $A$, length $L$, head difference $\Delta h$ and permeability $k$ is:

$Q = k \cdot A \cdot \dfrac{L}{\Delta h}$
$Q = k \cdot \dfrac{\Delta h}{L} \cdot A$✔️
$Q = k \cdot \Delta h \cdot L \cdot A$
$Q = \dfrac{k \cdot A}{\Delta h \cdot L}$

Correct Answer Logic:

Darcy's law: $Q = k \cdot i \cdot A$ where the hydraulic gradient $i = \dfrac{\Delta h}{L}$. Therefore $Q = k \cdot \dfrac{\Delta h}{L} \cdot A$. This linear relationship is valid for laminar flow where velocity is directly proportional to hydraulic gradient.

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The Constitution of Pakistan QUESTION #9395

Question 445

A provincial ordinance under Article 128 stands repealed after how many days if not approved by the Provincial Assembly?

60 days
90 days
120 days✔️
180 days

Correct Answer Logic:

Article 128(2) applies the same structure as Article 89 for presidential ordinances. A Governor's Ordinance shall stand repealed after 120 days (four months as originally stated, now 120 days per 18th Amendment parallel) if not approved, or earlier if disapproved by the Provincial Assembly. The 18th Amendment changed 'four months' to '120 days' for consistency.

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Medicinal Chemistry and Biopharmaceutics QUESTION #3826

Question 446

What functional role do stearyl alcohol and cetyl alcohol serve when incorporated as excipients in pharmaceutical formulations?

Preservatives
Emulsifiers✔️
Binding agents
Surfactants

Correct Answer Logic:

Stearyl alcohol and cetyl alcohol are fatty alcohols that act as emulsifiers and emollient stabilisers in creams and ointments, helping to form and stabilise water-in-oil or oil-in-water emulsions.

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General Knowledge QUESTION #8996

Question 447

Who is the founder of the Scout Movement?

Robert Baden-Powell✔️
Lord Colin Powell
Maccollins
Nikola Tesla

Correct Answer Logic:

Baden-Powell founded the Scouting movement.

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Reading and Writing (Module-1) QUESTION #10444

Question 448

The negotiations, initially marked by ------- between the two delegations, gradually gave way to a spirit of ------- as trust developed.

cooperation . . hostility
animosity . . cooperation✔️
harmony . . discord
trust . . suspicion

Correct Answer Logic:

Negotiations that begin hostile and end cooperative move from 'animosity' to 'cooperation.'

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Math Physics Chemistry Biology QUESTION #11400

Question 449

Which of the following is not a carbohydrate?

Glucose ($C_6H_{12}O_6$)
Sucrose ($C_{12}H_{22}O_{11}$)
Pyruvate ($C_3H_4O_3$)✔️
Ribose ($C_5H_{10}O_5$)

Correct Answer Logic:

Pyruvate ($C_3H_4O_3$) is not a carbohydrate — it is a 3-carbon keto acid (the ionized form of pyruvic acid), which is the end product of glycolysis. Carbohydrates follow the general formula $(CH_2O)_n$. Glucose ($C_6H_{12}O_6$), sucrose ($C_{12}H_{22}O_{11}$), and ribose ($C_5H_{10}O_5$) all fit the carbohydrate formula.

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General Knowledge QUESTION #4782

Question 450

The Strait of Malacca serves as the main shipping channel between the Indian Ocean and which ocean?

North Pacific Ocean✔️
South Pacific Ocean
South Atlantic Ocean
Arctic Ocean

Correct Answer Logic:

The Strait of Malacca connects the Indian Ocean to the South China Sea and the Pacific Ocean. It is one of the world's most important shipping lanes.

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Math Physics Chemistry Biology QUESTION #11417

Question 451

First law of thermodynamics is based on:

Law of conservation of momentum
Law of conservation of mass
Law of conservation of energy✔️
Law of conservation of charge

Correct Answer Logic:

The First Law of Thermodynamics is based on the law of conservation of energy: energy can neither be created nor destroyed, only converted from one form to another. It states that the change in internal energy of a system equals the heat added to the system minus the work done by the system: $\Delta U = Q - W$.

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Security Measures to Maintain Law and Order QUESTION #894

Question 452

Under Section 7(3), a person arrested for a "Law & Order" violation must be produced before a Magistrate within:

12 hours
24 hours (excluding travel time)✔️
48 hours
1 week

Correct Answer Logic:

This follows the standard constitutional and legal procedure in Pakistan, as specified in the Code of Criminal Procedure.

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Boilers Mechanical Engineering QUESTION #2469

Question 453

The wear load $F_w$ on a gear tooth (Buckingham equation) depends on which key gear geometry parameter related to the smaller gear?

$F_w \propto r_g^2$ (gear pitch radius squared)
$F_w = d_p B K Q$ where $d_p$ is the PINION pitch diameter✔️
$F_w \propto N_p/N_g$ (tooth ratio)
$F_w \propto P_d^2$ (diametral pitch squared)

Correct Answer Logic:

Buckingham's wear load: $F_w=d_p B K Q$, where $d_p$ is the pinion pitch diameter, $B$ is face width, $K$ is the stress-fatigue factor, and $Q=2N_g/(N_p+N_g)$ is the ratio factor.

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English QUESTION #7642

Question 454

She likes hiking, swimming, and to ride a bike.

She likes hiking swimming and to ride a bike.
She likes hiking swimming and biking
She likes hiking, swimming, and biking.
None of these✔️

Correct Answer Logic:

This question tests parallel structure. When listing activities, all items should have the same grammatical form. Options should be: hiking (gerund), swimming (gerund), and biking (gerund) - all in the same form for parallelism.

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Chemistry QUESTION #7186

Question 455

One gram of a metal carbonate ($M_{2}CO_{3}$) reacts with an excess of $HCl$ to produce $0.01186 \text{ moles}$ of $CO_{2}$. Calculate the molar mass of $M_{2}CO_{3}$ in $\text{g mol}^{-1}$.

$84.3$✔️
$118.6$
$11.86$
$1186$

Correct Answer Logic:

The reaction is $M_{2}CO_{3} + 2HCl \rightarrow 2MCl + H_{2}O + CO_{2}$:

From stoichiometry, $1 \text{ mole}$ of $M_{2}CO_{3}$ produces $1 \text{ mole}$ of $CO_{2}$.
Moles of $M_{2}CO_{3} = \text{Moles of } CO_{2} = 0.01186$.
Molar Mass = $\text{Mass} / \text{Moles} = 1 \text{ g} / 0.01186 \approx 84.3 \text{ g/mol}$.

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General Knowledge QUESTION #8992

Question 456

Which vitamin is essential for normal blood clotting?

Vitamin A
Vitamin C
Vitamin D
Vitamin K✔️

Correct Answer Logic:

Vitamin K helps blood to clot.

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Agriculture Economics QUESTION #11902

Question 457

The principle of comparative advantage states that a country (or producer) should specialize in producing the good for which it has:

The lowest absolute cost of production
The lowest opportunity cost relative to other producers✔️
The highest total output capacity
The largest labor force

Correct Answer Logic:

Comparative advantage is based on relative (opportunity) cost, not absolute cost — a producer specializes where its opportunity cost is lowest.

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Pakistan Affairs QUESTION #9105

Question 458

In which year were non-party elections held in Pakistan?

1985✔️
1995
2008
None of above

Correct Answer Logic:

Non-party based elections were held in 1985.

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MBBS QUESTION #10373

Question 459

Steroid hormones (e.g., cortisol, estrogen, testosterone), being lipid-soluble, characteristically exert their effects on target cells via which mechanism?

Binding exclusively to cell-surface G-protein coupled receptors
Diffusing directly across the plasma membrane to bind intracellular or nuclear receptors, which then function as ligand-activated transcription factors altering gene expression✔️
Binding ligand-gated ion channels at the cell surface
Requiring an obligatory second-messenger system, with no direct genomic (transcriptional) action possible

Correct Answer Logic:

Being small and lipophilic, steroid hormones cross the plasma membrane directly and bind intracellular or nuclear receptors; the hormone-receptor complex then acts as a transcription factor, binding hormone response elements in DNA to alter gene expression — a mechanism producing slower-onset but often longer-lasting effects compared with peptide hormone signaling.

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MCQs Section QUESTION #4835

Question 460

Select the word nearly opposite in meaning to "CAVIL"

Discern
Disclose
Introduce
Commend✔️

Correct Answer Logic:

Cavil means to make petty or unnecessary objections. Its antonym is 'commend,' which means to praise or express approval.

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