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Chemistry QUESTION #1444

Which reaction is most likely to occur with a bulky base like tert-butoxide?

SN1
SN2
E2✔️
None of these

Correct Answer Logic:

Bulky bases like potassium tert-butoxide ($(CH_3)_3CO^-K^+$) strongly favour elimination (E2) over substitution. The steric bulk of the base prevents it from attacking the carbon centre (backside attack needed for SN2); instead, it abstracts a proton from the $\beta$-carbon to give elimination. SN1 requires no base. Therefore, with bulky bases and secondary/tertiary substrates, E2 is the predominant pathway.

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Pharmacology and Toxicology QUESTION #3851

Question 2262

In which vascular structure are alpha-1 adrenoceptors predominantly found?

Arterioles✔️
Bronchioles
Atria
Cardiac ventricles

Correct Answer Logic:

Alpha-1 adrenoceptors are primarily located on arteriolar smooth muscle and mediate vasoconstriction.

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English QUESTION #489

Question 2263

The man felt his hair flutter and the tissues of his body drew tight as if he were standing at the centre

his hair flutter✔️
the tissues of his body drew tight
as if he were standing
None of these

Correct Answer Logic:

Error: 'his hair' should be 'his hair flutter' - actually sentence seems correct

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Basic Mathematics QUESTION #2852

Question 2264

Find the area of a triangle with base 24 cm and height 10 cm.

110 cm²
120 cm²✔️
130 cm²
240 cm²

Correct Answer Logic:

Area of triangle $= \dfrac{1}{2} \times \text{base} \times \text{height} = \dfrac{1}{2} \times 24 \times 10 = 120 \text{ cm}^2$.

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Agronomy QUESTION #2091

Question 2265

Heat stress during grain filling in wheat causes yield loss primarily through:

Delayed heading and extended vegetative growth phase
Accelerated leaf senescence, shortened grain-filling duration, and reduced starch synthase enzyme activity — resulting in smaller, shriveled grains with lower test weight even when adequate assimilates are available✔️
Increased tiller mortality and reduced spike number
Enhanced water use reducing soil moisture below wilting point

Correct Answer Logic:

Heat stress (>30°C during grain filling) directly impairs starch biosynthesis: starch synthase is heat-labile, losing activity above 30°C. This shortens effective grain-filling duration (fewer days × lower daily fill rate), producing small, shriveled grains. Agronomic responses include early planting (escape strategy), irrigation to reduce canopy temperature, and selection of heat-tolerant varieties with thermostable starch synthase.

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Urdu QUESTION #5091

Question 2266

عمراؤ جان ادا کس کا ناول ہے؟

راجندر سنگھ بیدی
سعادت حسن منٹو
مرزا ہادی رسوا✔️
ممتاز مفتی

Correct Answer Logic:

عمراؤ جان ادا مرزا ہادی رسوا کا ناول ہے جو 1899ء میں شائع ہوا۔

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Public Administration QUESTION #2927

Question 2267

What is "Performance Budgeting" designed to measure?

Quantity of inputs
Cost of labor
Outputs and outcomes achieved✔️
Historical spending patterns

Correct Answer Logic:

Performance budgeting links funding to the achievement of specific goals and measurable results.

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Electrical Engineering QUESTION #2150

Question 2268

A $50\text{ kVA}$ transformer has a copper loss of $800\text{ W}$ at full load. What will be the copper loss at half load?

$400\text{ W}$
$200\text{ W}$✔️
$100\text{ W}$
$600\text{ W}$

Correct Answer Logic:

Copper loss varies as the square of the load ($P_{cu} \propto I^2$). At half load, the loss is $(\frac{1}{2})^2 \times 800\text{ W} = \frac{1}{4} \times 800\text{ W} = 200\text{ W}$.

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Chemistry QUESTION #5578

Question 2269

Aspirin is the common name for which chemical compound?

Acetyl salicylic acid✔️
Phenyl salicylate
Acetyl salicylate
Methyl salicylic acid

Correct Answer Logic:

Aspirin is the brand name for acetylsalicylic acid (2-acetoxybenzoic acid). It is synthesized by acetylation of the –OH group of salicylic acid using acetic anhydride: $C_6H_4(OH)COOH + (CH_3CO)_2O \to C_6H_4(OCOCH_3)COOH + CH_3COOH$. It is an analgesic, antipyretic, and anti-inflammatory drug.

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Child Health QUESTION #3925

Question 2270

A term infant is delivered via ventouse assistance with light meconium-stained fluid. The baby is slow to initiate breathing, with Apgar scores of $3$ at $1$ minute, $5$ at $5$ minutes, and $9$ at $10$ minutes. Which step is most crucial for successful neonatal resuscitation?

Suctioning of the mouth and nose✔️
Insertion of a Guedel airway
Establishing adequate ventilation
Administration of supplemental oxygen

Correct Answer Logic:

2

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Paper-II (Pharmacognosy and Pharmaceutics-I) QUESTION #2973

Question 2271

The term 'Apothecary' in historical context refers to a person who:

Performs surgery
Prepares and sells medicines✔️
Manufactures surgical instruments
Administers anesthesia

Correct Answer Logic:

Apothecaries were the historical predecessors of modern pharmacists, specializing in the compounding of drugs.

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Islamic Studies QUESTION #632

Question 2272

The basic obligatory action of Hajj is:

Wuquf-e-Arafat✔️
Rami
Tawaf-e-Ziyarat
None of these

Correct Answer Logic:

Wuquf (standing) at Arafat is the most essential pillar of Hajj.

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Biology Zoology Botany QUESTION #1343

Question 2273

Erythropoietin, a hormone, is primarily produced by _________ and is involved for RBC production:

Liver
Kidney✔️
Leukocytes
None of these

Correct Answer Logic:

Erythropoietin (EPO) is a glycoprotein hormone primarily produced by peritubular interstitial cells in the cortex of the kidney (about 90%) in response to hypoxia (low oxygen levels). A small amount is produced in the liver. EPO stimulates the bone marrow to increase the production of red blood cells (erythropoiesis), thereby increasing oxygen-carrying capacity.

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Basic Mathematics QUESTION #4624

Question 2274

What is $\frac{1}{2} + \frac{1}{3} + \frac{1}{6}$?

$\frac{3}{6}$
$1$✔️
$\frac{1}{11}$
$\frac{2}{3}$

Correct Answer Logic:

$\frac{3}{6} + \frac{2}{6} + \frac{1}{6} = \frac{6}{6} = 1$

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Agronomy QUESTION #2035

Question 2275

The optimum harvest index (HI) of modern high-yielding wheat varieties compared to traditional tall varieties is higher because:

Modern varieties produce more total biomass per unit area
Modern varieties partition a greater proportion of total biological yield into the economic yield (grain), with HI values of 0.45–0.55 vs 0.30–0.35 in traditional varieties✔️
Modern varieties have shorter grain-filling periods, reducing respiration losses
Modern varieties have thicker stems that store more assimilates

Correct Answer Logic:

Harvest Index = Economic yield / Biological yield. Green Revolution breeding shifted assimilate partitioning toward grain by reducing stem height (dwarfing genes Rht1, Rht2), increasing HI from ~0.30 in tall varieties to 0.45–0.55 in semi-dwarf modern varieties — the primary mechanism behind yield gains.

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Agronomy QUESTION #2020

Question 2276

In Pakistan's seed multiplication system, which class of seed is produced directly from Breeder seed and is used to produce Registered seed?

Certified seed
Foundation seed✔️
Truthfully Labeled seed
Commercial seed

Correct Answer Logic:

The seed multiplication chain in Pakistan follows: Breeder Seed → Foundation Seed → Registered Seed → Certified Seed. Foundation seed is produced from breeder seed under strict supervision and maintains very high genetic and physical purity standards.

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Pakistan Affairs QUESTION #287

Question 2277

The Muslim rulers of Delhi in the Pre-Mughal era were called Sultans as they were bound to:

Avoid further expansion
Nominate their successors
Seek recognition from the Caliph after acquiring power✔️
Wage Jihad against the infidels

Correct Answer Logic:

Legally, a Sultan was a representative of the Abbasid Caliph and sought a 'Manshur' (investiture).+1

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English QUESTION #4425

Question 2278

The writer has unearthed serious irregularities in the entire project. The word 'unearthed' in this sentence means:

written
mentioned
exposed✔️
stated

Correct Answer Logic:

'Unearthed' literally means dug up from the ground. Figuratively, it means to discover or bring to light something hidden or unknown. 'Exposed' best captures this meaning — revealing hidden irregularities.

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