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Mechanical Engineering QUESTION #2431

Question 3521

The Nusselt number $Nu = hL/k$ physically represents:

Temperature gradient at surface divided by overall temperature difference
The ratio of convective to conductive heat transfer across the fluid boundary layer✔️
The ratio of thermal to momentum boundary layer thickness
The ratio of inertial to viscous forces

Correct Answer Logic:

Nusselt number: $Nu=hL/k$, the ratio of convective heat transfer to conductive heat transfer across the fluid layer.

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Basic Mathematics QUESTION #2868

Question 3522

Simplify the fraction to its lowest terms: $\frac{48}{72}$

$\frac{4}{6}$
$\frac{2}{3}$✔️
$\frac{12}{18}$
$\frac{8}{12}$

Correct Answer Logic:

The HCF of $48$ and $72$ is $24$. Dividing both by $24$ gives $\frac{2}{3}$.

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English QUESTION #672

Question 3523

Who is the author of "The Conquest of Happiness"?

Bertrand Russell✔️
Will Durant
Jean-Paul Sartre
Albert Camus

Correct Answer Logic:

In this 1930 book, Russell attempts to diagnose the causes of unhappiness and suggest a cure.

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Islamic Studies QUESTION #638

Question 3524

Shaykh Ahmad Sirhandi's (Mujaddid Alif Sani) line of Sufism was:

Qadiriya
Suhrawardiya
Naqshbandiya
None of these✔️

Correct Answer Logic:

He was the most prominent figure of the Naqshbandi order in India.

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Agronomy QUESTION #2078

Question 3525

ALS (acetolactate synthase) inhibitor herbicides, which include sulfonylureas, imidazolinones, and triazolopyrimidines, control weeds by:

Disrupting cell membrane integrity causing rapid desiccation
Inhibiting the first enzyme in branched-chain amino acid (valine, leucine, isoleucine) biosynthesis, arresting cell division in meristematic tissue — used at very low doses (grams per hectare) due to high enzyme affinity✔️
Blocking photosystem II electron transport causing photo-oxidative damage
Mimicking auxin hormones at supra-optimal concentrations causing uncontrolled growth and plant death

Correct Answer Logic:

ALS inhibitors block acetolactate synthase, preventing synthesis of branched-chain amino acids. Cell division in apical meristems ceases within days. They are active at extremely low doses (5–75 g a.i./ha for sulfonylureas) because of high target affinity. ALS mutation is the most common mechanism of herbicide resistance worldwide due to the single amino acid substitutions that confer resistance.

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Professional QUESTION #1862

Question 3526

Initial appointment to All Pakistan Services and Civil Services of Federation in BPS 16 and above shall be made on the basis of tests/examinations conducted by which body?

Departmental Selection Committee
Establishment Division
Federal Public Service Commission✔️
Selection Board

Correct Answer Logic:

Rule 10 states initial appointments to BPS 16 and above (except those not falling within FPSC purview) shall be made on the basis of tests and examinations conducted by the Commission (FPSC).

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Electrical Engineering QUESTION #2153

Question 3527

In Power Electronics, a Freewheeling Diode is used in an inductive load circuit to:

Increase the output voltage
Prevent high-voltage spikes $L\frac{di}{dt}$ during turn-off✔️
Rectify the AC input
Smooth the ripple in the capacitor

Correct Answer Logic:

The diode provides a path for the inductive current to continue flowing when the switch opens, preventing damaging $L\frac{di}{dt}$ voltage spikes.

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Basic Mathematics QUESTION #4598

Question 3528

Expand: $(x + 5)^2$

$x^2 + 25$
$x^2 + 10x + 25$✔️
$x^2 + 5x + 10$
$2x + 10$

Correct Answer Logic:

Using $(a+b)^2 = a^2 + 2ab + b^2$: $(x+5)^2 = x^2 + 10x + 25$

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CISA QUESTION #1789

Question 3529

Which document is best suited to formally define the relationship between an independent auditor and the engaging organization, and to record the mutually agreed-upon terms?

Audit charter
Annual audit plan
Engagement letter✔️
Auditor's report

Correct Answer Logic:

The engagement letter is used specifically with independent auditors to document the agreed-upon terms of the audit relationship. It records the mutual understanding between the audit committee and the independent auditor, and formally establishes the auditor's responsibility, accountability, and authority to conduct the engagement.

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Education QUESTION #1487

Question 3530

Pavlov's Classical Conditioning experiment demonstrated that dogs could be trained to salivate at the sound of a bell. This bell is an example of:

Unconditioned stimulus
Conditioned (neutral) stimulus✔️
Operant response
Primary reinforcer

Correct Answer Logic:

The bell is a neutral/conditioned stimulus. Pavlov paired it with food (unconditioned stimulus) until the dogs salivated at the bell alone, demonstrating Classical Conditioning.

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Pakistan Affairs QUESTION #590

Question 3531

In 1905 Bengal was partitioned during the Viceroyalty of:

Lord Mayo
Lord William Bentick
Lord Curzon✔️
None of These

Correct Answer Logic:

Lord Curzon announced the partition of Bengal in 1905.

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Accounting Finance and Punjab Sales Tax on Services QUESTION #2567

Question 3532

According to section 4(5) of the Act, where a taxable service originates from outside Pakistan but is received or terminates in the Punjab, the liability to pay tax to the Government falls upon:

The foreign service provider
The Federal Board of Revenue
The recipient of such service in Punjab✔️
The Punjab Revenue Authority itself

Correct Answer Logic:

Section 4(5) explicitly states that where a taxable service originates from outside Pakistan but is received or terminates in the Punjab, the RECIPIENT of such service shall be liable to pay the tax to the Government — establishing the reverse charge mechanism for imported services.

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Mechanical Engineering QUESTION #2507

Question 3533

The neutral axis of a beam cross-section in pure bending is the axis about which:

Stress is maximum
The second moment of area is minimum
Bending strain and stress are zero — it passes through the centroid✔️
The shear stress is zero

Correct Answer Logic:

In pure bending, the neutral axis is the axis of zero longitudinal strain and stress. By the condition $\int y\,dA = 0$ (from equilibrium), the neutral axis passes through the centroid of the cross-section.

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Urdu QUESTION #5175

Question 3534

درج ذیل میں سے کون سی شخصیت اقبال شناس شاعر تھی؟

نیاز فتح پوری
مستنصر حسین تارڑ
رفیع الدین ہاشمی✔️
وزیر آغا

Correct Answer Logic:

رفیع الدین ہاشمی ایک معروف اقبال شناس محقق اور ناقد ہیں جنہوں نے اقبال پر بہت کام کیا۔

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Chemistry QUESTION #1434

Question 3535

Which of the following is the primary site for the digestion of carbohydrates?

Stomach
Mouth
Small intestine✔️
None of these

Correct Answer Logic:

Although carbohydrate digestion begins in the mouth (salivary amylase breaks down starch), the primary and most significant site of carbohydrate digestion is the small intestine. Pancreatic amylase and brush-border enzymes (maltase, sucrase, lactase) in the small intestine break down complex carbohydrates and disaccharides into absorbable monosaccharides.

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Biology QUESTION #544

Question 3536

The cell suspension culture of __________ produces quinine.

Soybean
Cinchona ledgeriana✔️
Digitalis lanata
Luceferin

Correct Answer Logic:

Cinchona produces quinine

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Security Measures to Maintain Law and Order QUESTION #833

Question 3537

Under Section 6, which measure is primary for maintaining law and order regarding "unsavory elements"?

Summary Eviction
Compulsory Detention
Restricted Entry & Search✔️
Surveillance only

Correct Answer Logic:

Per Section 6, the Force is mandated to search and even exclude persons not meant to be in the aerodrome to maintain order.

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Paper-II (Pharmacognosy and Pharmaceutics-I) QUESTION #3579

Question 3538

The term 'Pharmacognosy' was first coined by Seydler in 1815. It is derived from which Greek words?

'Pharmakon' (drug) and 'gnosis' (knowledge)✔️
'Physis' (nature) and 'logos' (study)
'Pharmakon' and 'logos'
'Gnosis' and 'logos'

Correct Answer Logic:

Pharmacognosy literally means 'knowledge of drugs'.

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General Ability and Fire Fighting QUESTION #5630

Question 3539

What is the purpose of pulling the pin in the P.A.S.S. technique?

It starts the flow of the extinguishing agent
It breaks the tamper seal and allows the handle to be squeezed✔️
It activates the pressure gauge
It opens the nozzle valve

Correct Answer Logic:

Pulling the pin breaks the tamper seal that keeps the extinguisher from discharging accidentally. Once the pin is removed

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Education QUESTION #1475

Question 3540

According to Abdul Halim El-Muhammady (1993), the purpose of education is to produce individuals willing to take on the responsibility of:

Teachers and scholars
Scientists and engineers
Caliphs (successors of Prophet Muhammad)✔️
Government officials

Correct Answer Logic:

El-Muhammady stated that the purpose of education is to produce righteous individuals willing to take on the responsibility of the caliphs entrusted by Allah to lead us to happiness in this world and the next.

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