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Physics QUESTION #7098

A pendulum made of a uniform wire with cross-sectional area $A$ has a time period $T$. When a mass $M$ is attached to the bob, the period becomes $T_M$. If $Y$ is the Young's modulus, find the value of $\frac{1}{Y}$ [cite: 437].

$[(\frac{T_M}{T})^2 - 1]\frac{A}{Mg}$✔️
$[(\frac{T_M}{T})^2 - 1]\frac{Mg}{A}$
$[1 - (\frac{T_M}{T})^2]\frac{A}{Mg}$
$[1 - (\frac{T}{T_M})^2]\frac{A}{Mg}$

Correct Answer Logic:

The time period is $T = 2\pi\sqrt{L/g}$, meaning $L \propto T^2$ [cite: 437].

Initial length $L = kT^2$ and new length $L' = kT_M^2$
Extension $\Delta L = L' - L = k(T_M^2 - T^2)$
Strain $\frac{\Delta L}{L} = \frac{T_M^2 - T^2}{T^2} = (\frac{T_M}{T})^2 - 1$
From $Y = \frac{\text{Stress}}{\text{Strain}} = \frac{Mg/A}{\Delta L/L}$, we get $\frac{1}{Y} = [(\frac{T_M}{T})^2 - 1]\frac{A}{Mg}$[cite: 437, 440].

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Chemistry QUESTION #4372

Question 1422

What is the general requirement for free radical substitution reaction of ethane and halogen?

Low pressure
Low temperature
High pressure
Heat and UV light✔️

Correct Answer Logic:

Free radical substitution (e.g., $C_2H_6 + Cl_2 \xrightarrow{h\nu} C_2H_5Cl + HCl$) requires initiation by UV light or heat to generate free radicals by homolytic cleavage of the halogen molecule.

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Education QUESTION #6732

Question 1423

When implementing discussion method, a teacher should PRIMARILY:

Dominate conversation to ensure accuracy✔️
Facilitate dialogue through questioning
ensuring broad participation and deep exploration
Avoid controversial topics entirely

Correct Answer Logic:

1

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Chemistry QUESTION #1425

Question 1424

Solubility of a salt is decreased in the presence of:

Common ion✔️
High temperature
High pH
None of these

Correct Answer Logic:

The common ion effect: when a soluble salt sharing an ion with a sparingly soluble salt is added to the solution, the equilibrium shifts (Le Chatelier's principle) to reduce solubility of the sparingly soluble salt. For example, adding NaCl to a saturated solution of AgCl decreases AgCl solubility because the additional Cl$^-$ ions suppress ionisation of AgCl.

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Math Physics Chemistry Biology QUESTION #745

Question 1425

Emf = VBL sinθ (related to that):

Volts✔️
Ohm
Newton's
Joules

Correct Answer Logic:

EMF (electromotive force) is measured in Volts. The formula VBL sinθ gives the induced EMF in a conductor moving in a magnetic field.

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Chemistry QUESTION #1438

Question 1426

Starch is composed of:

Amylose and amylopectin✔️
Glycogen and amylopectin
Amylopectin and cellulose
None of these

Correct Answer Logic:

Starch is a polysaccharide storage carbohydrate in plants composed of two components: (1) Amylose — a linear polymer of glucose linked by $\alpha$-1,4-glycosidic bonds (~20–30% of starch), and (2) Amylopectin — a branched polymer with $\alpha$-1,4 linkages in the main chain and $\alpha$-1,6 linkages at branch points (~70–80%). Glycogen is the animal storage polysaccharide.

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Egnlish QUESTION #683

Question 1427

According to Russell, what is the connection between envy and unhappiness?

Envy is a catalyst for happiness
Envy is unrelated to happiness
Envy is a source of unhappiness✔️
None of these

Correct Answer Logic:

In The Conquest of Happiness, Russell identifies envy as one of the most potent causes of unhappiness.

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Islamic Studies QUESTION #358

Question 1428

Social Boycott of Banu Hashim took place in Nabvi year:

6th
7th✔️
8th
9th

Correct Answer Logic:

The boycott began in the 7th year of Prophethood and lasted for three years.+1

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Security Measures to Maintain Law and Order QUESTION #845

Question 1429

An AD ASF must ensure that "Airport Security Program" (ASP) is compliant with:

Local Police laws
ICAO standards✔️
Provincial laws
Airline policies

Correct Answer Logic:

Every airport's security plan must align with ICAO (International Civil Aviation Organization) guidelines.

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Paper-I (Anatomy/Physiology and Biochemistry/Microbiology) QUESTION #3157

Question 1430

'Anemia' is a condition characterized by:

High blood sugar
Low oxygen-carrying capacity of blood✔️
High blood pressure
Excessive white blood cells

Correct Answer Logic:

Anemia is usually due to low hemoglobin or low RBC count.

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MCQs Section QUESTION #4878

Question 1431

Which word is similar to "ACRIMONIOUS"

Bitter✔️
Provocative
Cheap
Volatile

Correct Answer Logic:

Acrimonious means having or showing strong bitterness or ill feeling in speech or manner. Bitter is its closest synonym.

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Urdu QUESTION #5065

Question 1432

اردو کی آخری کتاب کس کی تصنیف ہے؟

ڈپٹی نذیر احمد
شفیع محمد چودھری
عبدالحلیم شرر
ابنِ انشا✔️

Correct Answer Logic:

'اردو کی آخری کتاب' ابنِ انشا کی مزاحیہ و ادبی تصنیف ہے۔

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Biology Zoology Botany QUESTION #1391

Question 1433

Which scientist is known for developing the concept of genetic drift?

Gregor Mendel
Sewall Wright✔️
Charles Darwin
Alfred Russel Wallace

Correct Answer Logic:

Sewall Wright (1889–1988) was the American geneticist and population biologist who developed and formalised the concept of genetic drift (also called the Sewall Wright effect). He showed that random fluctuations in allele frequencies in small populations can cause significant changes in gene frequency over time, independent of natural selection.

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General Knowledge QUESTION #2590

Question 1434

UTF-8 is preferred over ASCII for modern office documents primarily because:

UTF-8 compresses files to a smaller size than ASCII
UTF-8 supports characters from virtually all written languages, while ASCII only covers basic English characters✔️
UTF-8 is faster to load on older computers
UTF-8 was developed before ASCII and is therefore more reliable

Correct Answer Logic:

UTF-8 is the most prevalent encoding standard used today because it can represent characters from virtually every written language in the world. ASCII is limited to English letters, digits, and basic punctuation, making it insufficient for multilingual documents.

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Chemistry QUESTION #4368

Question 1435

Poly vinyl chloride (PVC) is the type of:

Homopolymer
Thermosetting polymer
Thermoplastic polymer✔️
Copolymer

Correct Answer Logic:

PVC is formed by addition polymerization of vinyl chloride ($CH_2=CHCl$) monomers. It is a thermoplastic polymer — it softens on heating and re-hardens on cooling, and can be reshaped.

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Biology QUESTION #4296

Question 1436

The process of osmoregulation refers to:

The filtration of blood to remove metabolic waste
The regulation of solute and water movement between an organism and its environment✔️
The creation of an osmotic gradient in the kidney medulla
The secretion of hormones that control blood plasma

Correct Answer Logic:

Osmoregulation is the process by which organisms control the concentration of solutes and water in their body fluids to maintain homeostasis.

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Paper-I (Pharmaceutics II (Industrial and Quality Control) and Pharmaceutics III (Hospital and Community Pharmacy)) QUESTION #5720

Question 1437

A healthcare unit incorporates specialized scientific equipment and trained professionals working as a team. What is the fundamental aim of Hospital Pharmacy quality assurance?

To maximize profit
Manufacturing, assembling, and purchase of pharmaceuticals✔️
Reducing the number of doctors
Designing hospital architecture

Correct Answer Logic:

The text lists quality assurance for manufacturing and purchase as a primary aim.

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Disaster Management QUESTION #6547

Question 1438

What makes the localization of DRR more effective than purely top-down approaches?

It's cheaper
Local actors have contextual knowledge, community trust, and ability to tailor solutions to specific vulnerabilities and capacities✔️
It requires less coordination
It reduces government responsibility

Correct Answer Logic:

Section 13.4 emphasizes that local actors (communities, district authorities, CBOs) understand local risks, have community trust, and can implement context-specific solutions. Effective DRR combines local knowledge and ownership with technical and financial support from higher levels.

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Paper-I (Anatomy/Physiology and Biochemistry/Microbiology) QUESTION #3224

Question 1439

The 'Hypothalamus' acts as the body's thermostat. To COOL the body, it triggers:

Vasoconstriction
Shivering
Vasodilation and Sweating✔️
Increased metabolic rate

Correct Answer Logic:

Dilation of skin vessels and evaporation of sweat dissipate heat.

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Civil Procedure QUESTION #3730

Question 1440

A group of three friends decides to rob a liquor store. Friend A stays in the car as a getaway driver. Friend B goes inside with a gun. Friend C goes inside to grab the money. During the robbery, Friend B panics and shoots the clerk, killing him. What can Friend A be charged with?

Only conspiracy to commit robbery.
Robbery only.
First-degree murder under the 'Felony Murder' rule.✔️
Nothing, because A did not enter the store or pull the trigger.

Correct Answer Logic:

Under the Felony Murder rule, all participants in an inherently dangerous felony (like robbery) are liable for any deaths that occur during the commission of that felony, regardless of who pulled the trigger or whether they intended for a death to occur.

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