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Security Measures to Maintain Law and Order QUESTION #891

"Trace Detection" technology (ETD) is a measure to maintain order by identifying:

Metal objects
Microscopic explosive particles✔️
Stolen currency
Overweight bags

Correct Answer Logic:

Explosive Trace Detectors are used when physical search or X-ray is insufficient to clear a suspicion of "Sabotage" (Section 6).

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Geography QUESTION #6322

Question 2702

The epidemiological transition model describes a shift from:

Infectious diseases to chronic degenerative diseases as primary causes of death✔️
High mortality to low mortality societies
Rural to urban disease patterns
Communicable to non-communicable disease dominance

Correct Answer Logic:

Abdel Omran's epidemiological transition model describes the shift from infectious/parasitic diseases (pestilence and famine stage) to chronic degenerative diseases as primary mortality causes, parallel to the demographic transition.

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Chemistry QUESTION #5546

Question 2703

Which of the following substances exists as a covalent crystal (network solid) in the solid state?

Iodine
Silicon✔️
Sulphur
Phosphorus

Correct Answer Logic:

Silicon forms a giant covalent (network) crystal similar to diamond, where each Si atom is covalently bonded to four others in a tetrahedral arrangement extending throughout the crystal. This gives it a very high melting point. Iodine forms molecular crystals, sulphur and phosphorus also form molecular crystals.

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General Knowledge QUESTION #7708

Question 2704

Which two nations restored diplomatic ties in 2023 through Chinese mediation?

Israel and Iran
Saudi Arabia and Iran✔️
Turkiye and Armenia
None of these

Correct Answer Logic:

Saudi Arabia and Iran restored diplomatic relations in March 2023 through mediation by China. This historic agreement ended a seven-year diplomatic rift between the two regional powers and marked a significant shift in Middle Eastern geopolitics.

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Physics QUESTION #7057

Question 2705

A $2 \text{ kg}$ sample of monoatomic gas is maintained at a pressure of $4 \times 10^4 \text{ N/m}^2$ with a density of $8 \text{ kg/m}^3$. What is the order of the gas's internal energy due to thermal motion?

$10^3 \text{ J}$
$10^5 \text{ J}$
$10^4 \text{ J}$✔️
$10^6 \text{ J}$

Correct Answer Logic:

The internal energy $U$ of a monoatomic gas is $U = \frac{3}{2} nRT = \frac{3}{2} PV$.

First, find the volume $V$ using mass and density: $V = \frac{\text{mass}}{\text{density}} = \frac{2}{8} = 0.25 \text{ m}^3$.

$U = \frac{3}{2} \times (4 \times 10^4) \times 0.25 = 1.5 \times 10^4 = 15000 \text{ J}$.

The order of magnitude is $10^4 \text{ J}$.

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Boilers Mechanical Engineering QUESTION #2499

Question 2706

For triaxial principal stresses ordered as $\sigma_1 > \sigma_2 > \sigma_3$, the absolute maximum shear stress is:

$\tau_{max} = \frac{\sigma_1 - \sigma_2}{2}$
$\tau_{max} = \frac{\sigma_2 - \sigma_3}{2}$
$\tau_{max} = \frac{\sigma_1 - \sigma_3}{2}$✔️
$\tau_{max} = \frac{\sigma_1 + \sigma_3}{2}$

Correct Answer Logic:

In triaxial stress state with $\sigma_1 > \sigma_2 > \sigma_3$, the maximum is $\tau_{max}=\tau_{1/3}=(\sigma_1-\sigma_3)/2$.

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Boilers Mechanical Engineering QUESTION #2379

Question 2707

The transfer function of a PID (Proportional-Integral-Derivative) controller is:

$Y(s) = K + K_I s + K_D s^2$
$Y(s) = K + \frac{K_I}{s} + K_D s$✔️
$Y(s) = \frac{K_I}{s} + K_D s$
$Y(s) = K \cdot K_I \cdot K_D \cdot s$

Correct Answer Logic:

The PID controller combines all three actions: $Y(s)=K+\frac{K_I}{s}+K_D s$. P provides immediate response, I eliminates steady-state error, D adds damping and predictive action.

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Physics and Math QUESTION #786

Question 2708

Area of $\triangle$ in terms of sides is equal to:

$S(s-a)(s-b)(s-c)$
$\sqrt{S(s-a)(s-b)(s-c)}$✔️
$S(s+a)(s+b)(s+c)$
None

Correct Answer Logic:

By Heron's formula: Area $= \sqrt{s(s-a)(s-b)(s-c)}$, where $s = \dfrac{a+b+c}{2}$.

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Boilers Mechanical Engineering QUESTION #2516

Question 2709

In normal-tangential (n-t) coordinates, the acceleration of a particle moving along a curved path with speed $v$ and radius of curvature $\rho$ is:

Only the tangential component $\dot{v}\,\hat{e}_t$
Only the normal component $\frac{v^2}{\rho}\hat{e}_n$
Both $a_t = \dot{v}$ tangentially and $a_n = \frac{v^2}{\rho}$ normally✔️
A single vector directed toward the center of curvature

Correct Answer Logic:

In n-t coordinates: $\mathbf{a}=\dot{v}\hat{e}_t + \frac{v^2}{\rho}\hat{e}_n$. The tangential component $a_t=\dot{v}$ reflects speed change; the normal (centripetal) component $a_n=v^2/\rho$ reflects direction change.

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Boilers Mechanical Engineering QUESTION #2478

Question 2710

A 'crank' in mechanism terminology is defined as:

A link that oscillates back and forth about a fixed pivot
A link that has complex (combined rotation and translation) motion
A link that makes a complete ($360^\circ$) revolution about a fixed grounded pivot✔️
The output link of any mechanism

Correct Answer Logic:

By definition: a crank makes a complete revolution about a fixed (grounded) pivot; a rocker oscillates back and forth about a fixed pivot; a coupler has complex motion and is not fixed to ground.

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Professional QUESTION #1827

Question 2711

Under Section 7(5), confirmation of a civil servant in a service or post takes effect from which date?

The date of issuance of the confirmation notification
The date of joining the post
The date of occurrence of permanent vacancy or the date of continuous officiation, whichever is LATER✔️
The date of recommendation by the selection authority

Correct Answer Logic:

Section 7(5) specifies that confirmation shall take effect from the date of occurrence of a permanent vacancy in the service or post, or from the date of continuous officiation in such service or post, whichever is later. Both conditions are considered, and the later date governs.

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Chemistry QUESTION #7189

Question 2712

In a mildly alkaline environment, the thiosulphate ion ($S_{2}O_{3}^{2-}$) undergoes oxidation by $MnO_{4}^{-}$ to produce a species designated as 'A'. What is the oxidation state of sulfur in this resulting product 'A'?

2
4
6✔️

Correct Answer Logic:

In a neutral or weakly alkaline medium, permanganate ($MnO_{4}^{-}$) oxidizes thiosulphate ($S_{2}O_{3}^{2-}$) to sulphate ($SO_{4}^{2-}$). The reaction is:

$8MnO_{4}^{-} + 3S_{2}O_{3}^{2-} + H_{2}O \rightarrow 8MnO_{2} + 6SO_{4}^{2-} + 2OH^{-}$

In the sulphate ion ($SO_{4}^{2-}$), the oxidation state of sulfur is $+6$.

[cite: 13]

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Paper-I (Anatomy/Physiology and Biochemistry/Microbiology) QUESTION #3142

Question 2713

In males, where are the 'Spermatozoa' produced?

Prostate gland
Seminal vesicles
Seminiferous tubules✔️
Epididymis

Correct Answer Logic:

Sperm production occurs in these tubules within the testes.

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CISA QUESTION #1762

Question 2714

What is the primary benefit of applying precedence diagram analysis to BPR projects?

It sequences individual activities in detail
It reveals the cascading impact of changes✔️
It supports root cause analysis
It enables the use of decision tree reporting

Correct Answer Logic:

Precedence diagram analysis shows the ripple effect of changes and identifies the critical path — the minimum set of tasks required to meet the project objective. It helps distinguish high-dependency tasks that must be completed from low-priority tasks that may be dropped.

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Chemistry QUESTION #4376

Question 2715

A chemical reaction has a theoretical yield of $25\ g$, but only $20\ g$ of product was obtained. What is the percentage yield?

20%
25%
45%
80%✔️

Correct Answer Logic:

$\% yield = \dfrac{actual\ yield}{theoretical\ yield} \times 100 = \dfrac{20}{25} \times 100 = 80\%$.

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General Abilities QUESTION #4606

Question 2716

Expand: $(x - 3)^2$

$x^2 - 9$
$x^2 + 9$
$x^2 - 6x + 9$✔️
$x^2 - 3x - 9$

Correct Answer Logic:

Using $(a-b)^2 = a^2 - 2ab + b^2$: $(x-3)^2 = x^2 - 6x + 9$

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Security Measures to Maintain Law and Order QUESTION #866

Question 2717

The ultimate goal of combining "Security Measures" with "Ethics" is to ensure:

Total fear
Public Trust and Safety✔️
Faster boarding
Higher fines

Correct Answer Logic:

Effective law and order are only sustainable if the public trusts that security measures are applied fairly, legally, and ethically.

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Paper-I (Anatomy/Physiology and Biochemistry/Microbiology) QUESTION #3455

Question 2718

'Lactose Intolerance' is due to the deficiency of which enzyme?

Sucrase
Maltase
Lactase✔️
Amylase

Correct Answer Logic:

Lactase breaks down milk sugar (lactose) into glucose and galactose.

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Urdu QUESTION #5216

Question 2719

قواعد کی رو سے مسجد ہے؟

اسمِ ظرفِ زمان
اسمِ ظرفِ مکان✔️
اسمِ نکرہ
ان میں سے کوئی نہیں

Correct Answer Logic:

مسجد ایک جگہ کا نام ہے اس لیے یہ اسمِ ظرفِ مکان کہلاتی ہے۔

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Biology Zoology Botany QUESTION #1362

Question 2720

Which of the following is NOT a characteristic of algae?

Autotrophic
Multicellular
Lack true roots, stems, and leaves
All algae are microscopic✔️

Correct Answer Logic:

Not all algae are microscopic — this is the FALSE statement. Giant kelp (Macrocystis pyrifera) can grow up to 60 metres long. Algae are autotrophic (mostly), lack true roots/stems/leaves (they have thallus), and can be unicellular or multicellular. The statement that 'all algae are microscopic' is incorrect.

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