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Physics QUESTION #371

Question 5021

Which one is most stable element on the basis of binding energy?

Sn
Ba
Kr
Fe✔️

Correct Answer Logic:

Iron (Fe) has the highest binding energy per nucleon

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Mathematics QUESTION #4143

Question 5022

For uniform circular motion with speed $V$ and radius $R$, what is the normal component of acceleration?

$\frac{V}{R}$
$\frac{V^2}{R}$✔️
$\frac{dV}{dt}$
$0$

Correct Answer Logic:

Normal (centripetal) acceleration $a_n = \frac{V^2}{R}$ directed toward the center of curvature.

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Tourism & Hospitality Management QUESTION #1651

Question 5023

The Human Resource Management course covers 'performance management and appraisal.' According to the curriculum, which of the following is identified as a legal concern in performance appraisal systems?

The language used in performance review forms
Legal issues associated with performance appraisals — including discrimination, bias, documentation requirements, and the need for appraisal systems to be defensible under employment law✔️
The color-coding system used in performance rating scales
The frequency of performance reviews per calendar year

Correct Answer Logic:

Module 5 of the HRM course (Performance Management and Appraisal) specifically addresses: how to define and measure performance, legal issues associated with performance appraisals (including the risk of discriminatory or biased appraisals and documentation requirements that can withstand legal scrutiny), designing an appraisal system, and methods of delivering performance feedback.

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Civil / Architecture QUESTION #2365

Question 5024

In the design of steel plate girders, the proportioning of the web panel to prevent shear buckling without tension field action requires the shear buckling coefficient $k_v$. For an unstiffened web with $a/h \to \infty$ (no transverse stiffeners), the value of $k_v$ used in calculating the critical shear stress is:

4.0
5.34✔️
6.34
2.0

Correct Answer Logic:

For a web plate with no transverse stiffeners (pure shear panel, $a/h \to \infty$), the shear buckling coefficient is $k_v = 5.34$. When transverse stiffeners are present with aspect ratio $a/h \leq 1$: $k_v = 4.0 + \dfrac{5.34}{(a/h)^2}$. The critical shear stress is $F_{cr} = \dfrac{k_v \pi^2 E}{12(1-\nu^2)(h/t_w)^2}$. AISC uses $k_v = 5.34$ as the baseline for unstiffened webs.

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Chemistry QUESTION #7162

Question 5025

Which of the following chemical equations is correctly balanced and shows the right products?

$[Mg(H_{2}O)_{6}]^{2+} + (EDTA)^{4-} \rightarrow [Mg(EDTA)]^{2-} + 6H_{2}O$✔️
$CuSO_{4} + 4KCN \rightarrow K_{2}[Cu(CN)_{4}] + K_{2}SO_{4}$
$Li_{2}O + 2KCl \rightarrow 2LiCl + K_{2}O$
$CO + 2H_{2} \xrightarrow{catalyst} CH_{3}OH$

Correct Answer Logic:

Option 1 is the correct representation of a complexometric reaction where the polydentate ligand EDTA replaces the water molecules coordinated to Magnesium. Note that the charge on the resulting complex is correctly balanced as $2 + (-4) = -2$.

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Boilers Mechanical Engineering QUESTION #2416

Question 5026

The general 1D heat conduction (diffusion) equation with internal heat generation $\dot{q}$ (W/m³) is:

$\frac{\partial^2 T}{\partial x^2} + \frac{\dot{q}}{k} = \frac{1}{\alpha}\frac{\partial T}{\partial t}$ where $\alpha = k/(\rho c)$✔️
$\frac{\partial^2 T}{\partial x^2} = \frac{k}{\rho c}\frac{\partial T}{\partial t}$
$\frac{\partial T}{\partial t} = k\frac{\partial^2 T}{\partial x^2}$
$\frac{\partial^2 T}{\partial x^2} = \frac{\dot{q}}{k}$

Correct Answer Logic:

The 1D heat diffusion equation: $\frac{\partial^2 T}{\partial x^2}+\frac{\dot{q}}{k}=\frac{1}{\alpha}\frac{\partial T}{\partial t}$, where $\alpha=k/(\rho c)$ (m²/s) is the thermal diffusivity.

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General Science and Ability QUESTION #253

Question 5027

The isotopes of any element contain equal number of:

Protons✔️
Neutrons
Both electrons and protons
None of these

Correct Answer Logic:

Isotopes are atoms of the same element with the same number of protons but different neutrons.+1

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Pharmacokinetics and Pharmacodynamics QUESTION #3836

Question 5028

An adult receives $100$ mg of a drug IV and achieves a plasma concentration of $2.5\ \mu\text{g/mL}$. Assuming uniform distribution in body water, what is the apparent volume of distribution?

$0.4$ L
$4$ L
$40$ L✔️
$400$ L

Correct Answer Logic:

$V_d = \dfrac{\text{Dose}}{\text{Concentration}} = \dfrac{100\ \text{mg}}{2.5\ \mu\text{g/mL}} = \dfrac{100{,}000\ \mu\text{g}}{2.5\ \mu\text{g/mL}} = 40{,}000\ \text{mL} = 40\ \text{L}$.

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Geography QUESTION #6317

Question 5029

Christaller's Central Place Theory assumes a hexagonal market area pattern because:

Hexagons are the most aesthetically pleasing shape
Hexagons minimize distance to central place while eliminating overlap and gaps✔️
Hexagons represent medieval European town planning traditions
Hexagons maximize competition between central places

Correct Answer Logic:

Hexagons are the most efficient shape filling 2D space without gaps or overlaps while minimizing average distance from periphery to center. Circles leave gaps; squares/triangles create unequal distances. Hexagons optimize both complete coverage and accessibility.

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Planning QUESTION #4939

Question 5030

What is the primary purpose of a Feasibility Study in project planning?

To design the project
To assess project viability✔️
To construct the project
To market the project

Correct Answer Logic:

A Feasibility Study systematically evaluates technical, economic, legal, operational, and scheduling aspects to determine whether a project is viable and should proceed to detailed planning.

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General Knowledge QUESTION #8828

Question 5031

The constellation 'Southern Cross' (Crux) consists of how many main stars?

Seven Stars
Four Stars✔️
Five Stars
None of these

Correct Answer Logic:

The Southern Cross has four main stars.

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General Abilities QUESTION #4513

Question 5032

Simplify: $15 - 3 \times 4 + 2$

$50$
$5$✔️
$44$
$14$

Correct Answer Logic:

Using PEMDAS: $15 - 3 \times 4 + 2 = 15 - 12 + 2 = 5$

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Logical Reasoning QUESTION #4431

Question 5033

P and Q are M's parents. M and N are siblings. Q is N's mother. What is P to M?

Mother
Father✔️
Sister
Brother

Correct Answer Logic:

Q is the mother of both M and N (since Q is N's mother and M and N are siblings). P and Q are M's parents, so P must be the father. Therefore, P is the Father of M.

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Urdu QUESTION #5179

Question 5034

درست ضربِ مثل کون سی ہے؟

پڑھے نہ لکھے نام محمد عالم
پڑھے نہ لکھے نام علم دین
پڑھے نہ لکھے نام فاضل
پڑھے نہ لکھے نام محمد فاضل✔️

Correct Answer Logic:

درست ضربِ مثل ہے: 'پڑھے نہ لکھے نام محمد فاضل' یعنی کام کچھ نہیں لیکن نام بڑا ہو۔

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Security Measures to Maintain Law and Order QUESTION #890

Question 5035

"Crowd Control" during a flight delay is a measure to maintain law & order primarily falling under:

Aviation Safety
Aviation Security✔️
Terminal Management
Public Relations

Correct Answer Logic:

Managing large, frustrated groups is a security function to prevent riots or breaches into the airside.

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Pakistan Affairs QUESTION #291

Question 5036

Which constitutional framework operated in Pakistan between 1947 and 1956?

Indian Independence Act 1947
Lahore Resolution 1940
Government of India Act 1935✔️
Pakistan Independence Order 1947

Correct Answer Logic:

Until the 1956 Constitution, Pakistan used the amended 1935 Act as its interim constitution.+1

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Tourism & Hospitality Management QUESTION #1587

Question 5037

Which of the following correctly describes MICE tourism as categorized under 'Neotourism' in the Pakistan Tourist Destinations course?

Medical, International, Cultural, and Educational tourism
Meetings, Incentives, Conferences, and Exhibitions✔️
Multinational, Integrated, Cultural, and Eco tourism
Mobility, Infrastructure, Commerce, and Entertainment

Correct Answer Logic:

MICE stands for Meetings, Incentives, Conferences, and Exhibitions. The Pakistan Tourist Destinations course lists it under the Neotourism category alongside Ecotourism, Camping Tourism, Medical Tourism, and Pilgrimage Tourism as emerging tourism destinations in Pakistan.

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Chemistry QUESTION #1104

Question 5038

Match List I (Mixture) with List II (Method of Separation): A. CHCl$_3$ + C$_6$H$_5$NH$_2$ B. Crude oil C. Glycerol from spent-lye D. Aniline-water; with I. Distillation under reduced pressure II. Steam distillation III. Fractional distillation IV. Simple distillation

A-III, B-IV, C-I, D-II
A-III, B-IV, C-II, D-I
A-IV, B-III, C-I, D-II✔️
A-IV, B-III, C-II, D-I

Correct Answer Logic:

CHCl$_3$ + aniline: miscible liquids with different bp → simple distillation (IV). Crude oil: mixture of hydrocarbons → fractional distillation (III). Glycerol from spent-lye: glycerol decomposes at bp → distillation under reduced pressure (I). Aniline-water: immiscible, high bp compound → steam distillation (II). A-IV, B-III, C-I, D-II.

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Dairy Food Science and Technology QUESTION #5981

Question 5039

What is the function of rennet paste vs. liquid rennet or chymosin powder in traditional artisan cheese production?

Rennet paste provides only lipase activity, not proteolytic coagulation
Rennet paste from kid/lamb abomasum contains both chymosin (coagulation) and pregastric esterase (PGE, a lipase), developing characteristic sharp lipolytic flavor in Italian hard cheeses like Pecorino and Provolone✔️
Rennet paste has slower proteolytic activity but faster whey drainage
Rennet paste is used exclusively for soft cheeses like Camembert

Correct Answer Logic:

Traditional rennet paste (from kid/lamb stomachs) contains chymosin for milk coagulation PLUS pregastric esterase (PGE), a lipase that hydrolyzes short-chain fatty acids (particularly butyric acid at $sn$-3 position of triglycerides). This produces the characteristic peppery, piquant flavor of Italian artisan cheeses (Pecorino Romano, Provolone Piccante).

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Physics QUESTION #7033

Question 5040

Determine the dimensional formula for the permittivity of a vacuum ($\epsilon_0$). Given the fundamental quantities: $M$ = mass, $L$ = length, $T$ = time, and $A$ = electric current.

$[\epsilon_0] = [M^{-1} L^{-3} T^2 A]$
$[\epsilon_0] = [M^{-1} L^{-3} T^4 A^2]$✔️
$[\epsilon_0] = [M^{-1} L^2 T^4 A^{-2}]$
$[\epsilon_0] = [M^{-1} L^2 T^{-1} A]$

Correct Answer Logic:

According to Coulomb's Law, the force $F$ between two charges $q_1$ and $q_2$ separated by distance $r$ is:

$F = \frac{1}{4\pi\epsilon_0} \frac{q_1 q_2}{r^2}$

Rearranging for permittivity:

$\epsilon_0 = \frac{q^2}{4\pi F r^2}$

Dimensional analysis:

Charge $[q] = [AT]$
Force $[F] = [MLT^{-2}]$
Distance $[r] = [L]$

$[\epsilon_0] = \frac{[A^2 T^2]}{[M L T^{-2}] [L^2]} = [M^{-1} L^{-3} T^4 A^2]$

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