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Mechanical Engineering QUESTION #2471

In the Lewis beam strength equation for gear tooth bending, the allowable bending load $F_b$ is expressed as:

$F_b = \sigma_b B / P_d$
$F_b = \sigma_0 B p Y = \sigma_0 B \pi Y / P_d$✔️
$F_b = \sigma_0 B C / P_d^2$
$F_b = \pi \sigma_0 B d / N$

Correct Answer Logic:

The Lewis equation: $F_b = \sigma_0 B p Y$ where $\sigma_0$ is allowable bending stress, $B$ is face width, $p=\pi/P_d$ is circular pitch, and $Y$ is the Lewis form factor.

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The Title 28 of the United States Code QUESTION #3731

Question 3542

Police have a warrant to search a house for a stolen 60-inch television. During the search, an officer opens a small jewelry box on a nightstand and finds illegal drugs. Is the search of the jewelry box legal?

Yes, because they had a search warrant for the house.
No, because a 60-inch television could not possibly be inside a small jewelry box.✔️
Yes, under the 'Plain View' doctrine.
No, unless they had probable cause to believe drugs were there.

Correct Answer Logic:

A search warrant only allows police to search in areas where the items listed in the warrant could reasonably be found. A large TV cannot be in a small jewelry box, so searching there exceeds the scope of the warrant.

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Chemistry QUESTION #1103

Question 3543

Predict major product 'P': cyclopentyl methyl ketone $\xrightarrow{\text{(i) HBr, benzoyl peroxide}}\xrightarrow{\text{(ii) KCN}}\xrightarrow{\text{(iii) Na(Hg)/C}_2\text{H}_5\text{OH}}$ P:

Cyclopentyl group with CH$_3$ and NC substituents
NC–CH(CH$_3$)–cyclopentyl
Cyclopentane ring with CH$_3$ and CH$_2$NH$_2$
Cyclopentane ring with CH$_3$ and CH$_2$NH$_2$ (exocyclic)✔️

Correct Answer Logic:

(i) HBr with peroxide = anti-Markovnikov addition → CH$_2$Br at the end of the methyl chain (allylic/radical). (ii) KCN substitutes Br → –CH$_2$CN. (iii) Na(Hg)/EtOH reduces CN → –CH$_2$NH$_2$. Major product: cyclopentyl group bearing –CH$_3$ transformed to –CH$_2$NH$_2$ substituent = option (4).

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Paper-II (Pharmacognosy and Pharmaceutics-I) QUESTION #3683

Question 3544

Which drug is used to treat 'Dry Skin' and is a fixed oil from 'Prunus amygdalus'?

Almond oil✔️
Peppermint oil
Clove oil
Fennel oil

Correct Answer Logic:

Almond oil is a soothing emollient.

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Paper-I (Anatomy/Physiology and Biochemistry/Microbiology) QUESTION #3223

Question 3545

'Referred Pain' is the phenomenon where:

Pain is only felt in the brain
Pain from a visceral organ is felt in a somatic area (like skin)✔️
Pain disappears quickly
Pain is imagined

Correct Answer Logic:

For example, heart pain is often felt in the left arm or jaw.

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Electrical Engineering QUESTION #2163

Question 3546

The open-loop transfer function of a unity feedback system is $G(s) = \frac{K}{s(s+2)(s+4)}$. By the Routh-Hurwitz criterion, the system is marginally stable when $K$ equals:

$48$✔️
$24$
$16$
$8$

Correct Answer Logic:

Characteristic equation: $s^3 + 6s^2 + 8s + K = 0$. Routh array row 3 pivot: $\frac{48-K}{6}$. For marginal stability: $48 - K = 0 \Rightarrow K = 48$.

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Paper-I (Anatomy/Physiology and Biochemistry/Microbiology) QUESTION #3526

Question 3547

'Tinctures' are alcoholic or hydro-alcoholic extractions of:

Minerals only
Crude drugs (plant or animal material)✔️
Synthetic powders
Pure water

Correct Answer Logic:

Tinctures are common liquid forms of herbal medicines.

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Islamic Studies QUESTION #631

Question 3548

"Hadith Taqreeri" mentions:

Speeches of the Prophet (ﷺ)
Conversation of Companions
Silence of the Prophet (ﷺ) on a companion's action✔️
None of these

Correct Answer Logic:

It refers to actions done by companions in the Prophet's presence which he did not forbid.

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Pakistan Affairs QUESTION #4670

Question 3549

Pakistan held the chairmanship of which international grouping around 2008?

Non-Aligned Movement
SAARC
Group of 77✔️
ECO

Correct Answer Logic:

Pakistan has chaired the Group of 77 (G77), which is a coalition of developing nations within the UN system advocating for their collective economic interests.

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English QUESTION #2683

Question 3550

Complete the sentence: 'Copper is ___ useful metal.'

a✔️
an
the
no article

Correct Answer Logic:

Although 'useful' starts with a vowel, it begins with a consonant sound /y/, so 'a' is used.

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English QUESTION #2790

Question 3551

Which is the CORRECTLY SPELLED word?

Occured
Occurred✔️
Ocurred
Occurrd

Correct Answer Logic:

The correct spelling is 'Occurred' — the final consonant 'r' is doubled before adding '-ed' because the stress is on the last syllable. Rule: double the final consonant when the syllable is stressed.

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Math (Module-1) QUESTION #5472

Question 3552

For a rectangle, the ratio of length to width is $35:10$. The width increases by $7$ units. How must the length change to maintain this ratio?

Decrease by $24.5$ units
Increase by $24.5$ units✔️
Decrease by $7$ units
Increase by $7$ units

Correct Answer Logic:

Ratio $\frac{L}{W} = \frac{35}{10} = 3.5$. If width becomes $W+7$, length must be $3.5(W+7) = 3.5W + 24.5$. Thus, length increases by $24.5$.

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City and Regional Planning QUESTION #4977

Question 3553

What is the primary advantage of participatory GIS (PGIS) over conventional GIS?

Lower cost
Integration of local knowledge✔️
Faster processing
Higher accuracy

Correct Answer Logic:

PGIS integrates local community knowledge, indigenous spatial information, and participatory mapping techniques with GIS technology, ensuring planning decisions reflect ground realities and community perspectives rather than just technical/expert viewpoints.

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Urdu QUESTION #5191

Question 3554

درست محاورہ بتائیں؟

ٹانگ ٹانگے مارنا
ناچ نہ جانے آنگن ٹیڑھا✔️
تارے دکھائی دینا
ان میں سے کوئی نہیں

Correct Answer Logic:

صحیح ضربِ مثل ہے: 'ناچ نہ جانے آنگن ٹیڑھا' یعنی اپنی غلطی کو چھپانے کے لیے بہانہ ڈھونڈنا۔

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General Knowledge QUESTION #170

Question 3555

The Book 'Pakistan Political and Constitutional Engineering' was written by:

Hassan Askari
Ilhan Niaz
Mahboob Ahmad✔️
None of these

Correct Answer Logic:

Dr. Mahboob Ahmad is the author of this detailed historical and political study.

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Basic Mathematics QUESTION #4637

Question 3556

If the product of two numbers is $48$ and one number is $6$, what is the other?

$8$✔️
$42$
$54$
$288$

Correct Answer Logic:

Let other number = $x$. Then $6x = 48$, so $x = 8$

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Agronomy QUESTION #2113

Question 3557

Phenomics in modern agronomy refers to:

The study of phenotypic plasticity in weed populations under herbicide selection pressure
The high-throughput measurement of plant traits (morphological, physiological, biochemical) using sensors, imaging (RGB, thermal, hyperspectral, LiDAR), and computational analysis — bridging the 'phenotyping bottleneck' between genomic information and field performance to accelerate crop improvement and precision agronomy✔️
The traditional method of visual scoring of crop traits by trained agronomists in field trials
The science of predicting phenological development stages using degree-day accumulation models

Correct Answer Logic:

Phenomics addresses the critical bottleneck: genomics generates vast data on genetic variation, but connecting genotype to field phenotype at scale and speed requires high-throughput phenotyping platforms — ground-based (LemnaTec, Scanalyzer) and aerial (UAV-mounted sensors). Traits measured: canopy temperature (thermal), chlorophyll content (NDVI, hyperspectral), architecture (LiDAR/3D), root systems (X-ray CT). This enables genomic selection, QTL mapping, and precision agronomy at previously impossible scales.

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Paper-II (Pharmacognosy and Pharmaceutics-I) QUESTION #2980

Question 3558

In which year was the first edition of the British Pharmacopoeia (BP) published?

1858
1864✔️
1898
1914

Correct Answer Logic:

The first BP was published in 1864, merging the London, Edinburgh, and Dublin pharmacopoeias.

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Agronomy QUESTION #2092

Question 3559

Drought escape as a mechanism of crop adaptation to water deficit differs from drought tolerance in that:

Drought escape requires genetic modification while tolerance is a natural trait
Drought escape is a phenological strategy — completing the life cycle (particularly the sensitive reproductive stage) before or during periods when water deficit occurs — without requiring the plant to physiologically withstand low tissue water potentials✔️
Drought escape results in higher yield than drought tolerance under all conditions
Drought escape involves waxy leaf surfaces to reduce transpiration

Correct Answer Logic:

Drought adaptation mechanisms: Escape (phenological — early maturity, photoperiod sensitivity completes grain fill before drought); Avoidance (reducing water loss: deep roots, stomatal closure, leaf rolling, reduced leaf area); Tolerance (maintaining function at low tissue water potential: osmotic adjustment, desiccation tolerance). Escape is a timing strategy, not a physiological response to stress.

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Chemistry QUESTION #5565

Question 3560

When glucose is subjected to prolonged heating with HI, the final product obtained is:

Hexanoic acid
6-Iodohexanal
$n$-Hexane✔️
1-Hexene

Correct Answer Logic:

When glucose is treated with HI (hydroiodic acid) on prolonged heating, all the –OH groups are replaced by –I (forming hexaiodohexane), followed by reduction of C–I bonds. This ultimately gives $n$-hexane. This classic reaction confirmed the straight-chain structure of glucose.

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