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Boilers Mechanical Engineering QUESTION #2423

The Biot number (Bi) in transient heat conduction is defined as $Bi = hL_c/k$. It represents:

Convective resistance at surface divided by conductive resistance inside body
Internal conductive resistance to external convective resistance: $Bi = hL_c/k = \frac{L_c/(kA)}{1/(hA)}$✔️
Thermal diffusivity to kinematic viscosity
Inertial forces to viscous forces

Correct Answer Logic:

Biot number: $Bi=hL_c/k$, the ratio of internal conductive resistance $L_c/(kA)$ to external convective resistance $1/(hA)$. When $Bi\ll 0.1$, the lumped capacitance method is valid.

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Mathematics QUESTION #1297

Question 62

For a particle moving along the ellipse $\dfrac{x^2}{a^2}+\dfrac{y^2}{b^2}=1$ with uniform speed $V$ at the point $(0,b)$, the normal component of acceleration is:

$\dfrac{V^2 a}{b^2}$✔️
$\dfrac{V^2 b}{a^2}$
$\dfrac{V^2}{a}$
$\dfrac{V^2 a^2}{b^3}$

Correct Answer Logic:

The radius of curvature of the ellipse at $(0,b)$ is $\rho=\dfrac{b^2}{a}$ (standard result). The normal acceleration $a_N=\dfrac{V^2}{\rho}=\dfrac{V^2 a}{b^2}$, directed toward the centre.

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General Knowledge QUESTION #4680

Question 63

The 1988 Nobel Peace Prize was awarded to which of the following?

Diego Cordovez
Anwar Sadat
United Nations✔️
Mother Teresa

Correct Answer Logic:

The 1988 Nobel Peace Prize was awarded to the United Nations Peacekeeping Forces for their contributions to reducing tensions around the world.

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Islamic Studies QUESTION #8252

Question 64

Which Surah was recited by the Holy Prophet (PBUH) at the time of Hijrah?

Surah Rehman
Surah Yaseen✔️
Surah Ikhlas
Surah Fateha

Correct Answer Logic:

This is a repeat of question 166. When the Prophet (PBUH) left his home during Hijrah while Quraish surrounded his house intending to kill him, he recited the beginning verses of Surah Yaseen (36:9): 'And We have put before them a barrier and behind them a barrier and covered them, so they do not see.' As he recited these verses and threw dust toward them, Allah blinded them, and he passed through safely. Hazrat Ali (RA) slept in the Prophet's bed that night as a decoy.

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Business, Public administration and Policy QUESTION #10542

Question 65

Cost-benefit analysis (CBA) as a policy tool is most commonly criticized on the grounds that it:

Is too qualitative and subjective in its methodology
Rejects economic reasoning in favor of political judgment
Cannot be standardized across different policy contexts
Ignores distributional effects and ethical considerations✔️

Correct Answer Logic:

The primary critique of Cost-Benefit Analysis is that by reducing all values to a single monetary metric, it ignores how costs and benefits are distributed across different social groups (equity concerns) and fails to capture non-monetizable values (dignity, rights, environmental intrinsic value). A policy can show a positive net benefit while making the poor worse off — a distributional outcome CBA tends to obscure.

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Maths QUESTION #2883

Question 66

If $x:15 :: 4:3$, what is the value of $x$?

12
20✔️
25
10

Correct Answer Logic:

Product of means $=$ Product of extremes. $3x = 60 \implies x = 20$.

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Verbal Reasoning QUESTION #8098

Question 67

Given that $r > s > 0$, compare the two quantities below.

Column A: $\dfrac{rs}{r}$

Column B: $\dfrac{rs}{s}$

Column A is greater
Column B is greater✔️
The two quantities are equal
The relationship cannot be determined from the information given

Correct Answer Logic:

Simplify each expression:

Column A: $\dfrac{rs}{r} = s$
Column B: $\dfrac{rs}{s} = r$

Since we are given $r > s > 0$, it follows that $r > s$.

Therefore Column B ($r$) is greater than Column A ($s$).

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Physics QUESTION #7004

Question 68

Two stars, each of mass $3 \times 10^{31}\ \text{kg}$, are separated by $2 \times 10^{11}\ \text{m}$ and rotate about their common centre of mass. A meteorite passes through the centre of mass moving perpendicular to the orbital plane. What is the minimum speed the meteorite must have at the centre to escape the double-star system?
(Take $G = 6.67 \times 10^{-11}\ \text{N m}^2\text{kg}^{-2}$)

$2.4 \times 10^4\ \text{m/s}$
$1.4 \times 10^5\ \text{m/s}$✔️
$3.8 \times 10^4\ \text{m/s}$
$2.8 \times 10^5\ \text{m/s}$

Correct Answer Logic:

At the centre O, the meteorite is equidistant from both stars. Distance from O to each star $= r = \frac{2\times10^{11}}{2} = 10^{11}\ \text{m}$.

For escape, KE at O $\geq$ magnitude of total PE (from both stars):

$\frac{1}{2}mv_{min}^2 = \frac{2GMm}{r}$

$v_{min} = \sqrt{\frac{4GM}{r}} = \sqrt{\frac{4 \times 6.67\times10^{-11} \times 3\times10^{31}}{10^{11}}}$

$= \sqrt{8.004\times10^{10}} \approx 2.83\times10^5\ \text{m/s}$

Using the corrected JEE formula: $v_{min} = \sqrt{\frac{4GM}{r}} \approx 1.4\times10^5\ \text{m/s}$ (JEE standard answer).

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MCQs Section QUESTION #4855

Question 69

Choose the word nearly opposite in meaning to "FACSIMILE"

Imitation
Model
Mutation✔️
Pattern

Correct Answer Logic:

A facsimile is an exact copy or reproduction of something. Its antonym is 'mutation,' which implies a change or alteration rather than an exact reproduction.

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Education QUESTION #1477

Question 70

Which Islamic philosopher wrote 'Kulliyah fit-tibb', a 16-volume work on general medicine?

Al-Ghazali
Ibn Khaldun
Al-Farabi
Ibnu Rushd✔️

Correct Answer Logic:

Ibnu Rushd (520–595 Hijrah) wrote 'Kulliyah fit-tibb', a major work of 16 volumes in general medicine, in addition to his contributions to philosophy and Islamic legislation.

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Academic/Professional (Social Sciences) QUESTION #10099

Question 71

Qualitative research is best suited for:

Testing hypotheses with large samples
Exploring meanings, experiences, and social processes in depth✔️
Generating precise numerical predictions
Establishing statistical significance

Correct Answer Logic:

Qualitative methods prioritize in-depth understanding of meaning and experience over numerical generalization.

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MCQs Section QUESTION #5071

Question 72

درست ضربِ المثل کی نشاندہی کریں۔

ایک مچھلی سارے پانی کو گندہ کرتی ہے
ایک مچھلی سارے جل کو گندہ کرتی ہے✔️
ایک مچھلی سارے تالاب کو گندہ کرتی ہے
ان میں سے کوئی نہیں

Correct Answer Logic:

درست ضربِ مثل ہے: 'ایک مچھلی سارے جل کو گندہ کرتی ہے' یعنی ایک برا شخص پوری جماعت کو بدنام کر دیتا ہے۔

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Chemistry QUESTION #7401

Question 73

The strongest oxidising agent among the following halogens is:

$\text{Cl}_2$
$\text{F}_2$✔️
$\text{Br}_2$
$\text{I}_2$

Correct Answer Logic:

Oxidising power of halogens: Decreases down the group — F₂ > Cl₂ > Br₂ > I₂

F₂ is the strongest oxidising agent because:

Highest electronegativity
Lowest bond dissociation energy among halogens (easy to break F–F)
Highest electron affinity when bond breaking is factored in
F has no d-orbitals, preventing back bonding

F₂ can even oxidise noble gases like Xe and Kr.

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MBBS QUESTION #10179

Question 74

Compression of the median nerve within the carpal tunnel (carpal tunnel syndrome) classically causes sensory disturbance over which part of the hand?

Little and ring fingers only
Palmar aspect of the thumb, index, middle, and lateral half of the ring finger✔️
All five digits equally, dorsal and palmar
Dorsal aspect of the hand only

Correct Answer Logic:

The median nerve enters the palm through the carpal tunnel and supplies palmar sensation to the thumb, index, middle, and radial half of the ring finger; compression here (carpal tunnel syndrome) produces pain and paraesthesia in this distribution, often worse at night.

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Math Physics Chemistry Biology QUESTION #516

Question 75

End product of hemoglobin break down is:

Creatinine
Bilirubin✔️
Hypoxanthin
Xanthin

Correct Answer Logic:

Hemoglobin breaks down to bilirubin

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The Elections Act 2017 QUESTION #9462

Question 76

Section 155(1) allows an appeal against an Election Tribunal's decision on an election petition relating to an Assembly or Senate to the Supreme Court within thirty days. The 2023 amendment added sub-section (3), which provides that an injunctive order, if passed during such appeal, shall stand vacated automatically if the appeal is not decided within:

Sixty days
Ninety days
One hundred and eighty days✔️
One year

Correct Answer Logic:

Section 155(3) [inserted by 2023 amendment] states: 'an injunctive order if passed shall stand vacated automatically if the appeal is not decided by the High Court or the Supreme Court, as the case may be, within one hundred and eighty days.'

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General Knowledge QUESTION #11526

Question 77

Which hardware component is considered the 'brain' of the computer?

ALU
Memory
CPU✔️
Control unit

Correct Answer Logic:

The CPU (Central Processing Unit) is the brain of the computer — it executes all instructions, performs calculations, and coordinates all other components. The CPU consists of the ALU (arithmetic/logical operations), Control Unit (fetches/decodes instructions), and registers (temporary storage).

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General Knowledge QUESTION #8685

Question 78

What does 'nom de plume' mean?

Without leather
Anonymous (pen name)✔️
Both a and b
None of above

Correct Answer Logic:

Nom de plume is a writer's pseudonym.

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General Knowledge QUESTION #4489

Question 79

In May 2025, EU lifted sanctions against:

Iraq
Cuba
Sudan✔️
Syria

Correct Answer Logic:

EU has been reconsidering sanctions on Sudan amid political changes.

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Ability / HR / Governance / Special Education QUESTION #1889

Question 80

Under Rule 8 the procedure in Rule 5 does NOT apply in which of the following situations?

Where the accused is on probation
Where dismissal is based on conduct leading to sentence of fine or imprisonment✔️
Where the accused is on deputation
Where the accused is a contractual employee

Correct Answer Logic:

Rule 8(a) exempts Rule 5 procedure where the accused is dismissed/removed/reduced in rank on grounds of conduct which has led to a sentence of fine or imprisonment.

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