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General Ability and Fire Fighting QUESTION #5608

Question 1

Which extinguishing agent works by inhibiting the chemical chain reaction of a fire?

Water
Foam
Dry chemical agents✔️
Sand

Correct Answer Logic:

Dry chemical agents and Halon substitutes work by interfering with the molecular chain reaction during combustion

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Education QUESTION #6881

Question 2

A school implements a reward system in which an entire class earns or loses privileges based on the behavior of individual members. This structure is BEST described as which type of intervention?

Reality Therapy
Student Team Learning
Group Contingency✔️
Logical Consequences

Correct Answer Logic:

Group contingencies are behavioral structures in which rewards or penalties are distributed to a group based on the behavior of individuals within that group. Research supports their effectiveness in remediating misbehavior by enlisting peer influence and social responsibility as behavioral incentives.

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Reading and Writing (Module-1) QUESTION #5358

Question 3

Transgenic fish have genetic material from other species. Some contain jellyfish DNA, causing them to glow. Originally created for labs in the 90s, they became pets later and are now appearing in Brazilian rivers. A student suggests their escape from farms could lead to long-term ecological damage. Which quotation from a researcher would best support the student's assertion?

'In one site in the wild where transgenic fish were observed, females outnumbered males, while in another the numbers of females and males were equivalent.'
'Though some presence of transgenic fish in the wild has been recorded, there are insufficient studies of the impact of those fish on the ecosystems into which they are introduced.'
'The ecosystems into which transgenic fish are known to have been introduced may represent a subset of the ecosystems into which the fish have actually been introduced.'
'Through interbreeding, transgenic fish might introduce the trait of fluorescence into wild fish populations, making those populations more vulnerable to predators.'✔️

Correct Answer Logic:

Option D provides a specific negative ecological outcome (vulnerability to predators) resulting from the transgenic trait entering the wild population.

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Economics QUESTION #1699

Question 4

Which Nobel Prize-winning economist conceptualised the framework of 'Development as Freedom,' arguing that development must be evaluated by the expansion of human capabilities and substantive freedoms?

Paul Samuelson
Amartya Sen✔️
Milton Friedman
None of these

Correct Answer Logic:

Amartya Sen, the Indian economist and Nobel Laureate (1998), articulated the 'Development as Freedom' framework in his landmark 1999 book of the same name. He argued that development should be understood as the expansion of real freedoms people enjoy — including political freedoms, economic facilities, social opportunities, transparency guarantees, and protective security. This approach influenced the UNDP's Human Development Index (HDI) and reoriented development economics beyond GDP growth.

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Planning QUESTION #5017

Question 5

Which principle guides the allocation of infrastructure costs in new development?

Historic cost recovery
Growth pays for growth✔️
Equal distribution
Government subsidy priority

Correct Answer Logic:

The 'growth pays for growth' principle (implemented through development impact fees) requires new development to fund proportionate infrastructure costs (roads, utilities, parks) rather than burdening existing residents, ensuring fair cost allocation and adequate infrastructure provision.

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Mathematics QUESTION #4094

Question 6

In applying the Mean Value Theorem to prove $e^x\geq1+x$ for all $x\in\mathbb{R}$, define $g(t)=e^t-1-t$. Then $g'(t)=e^t-1$. For $t>0$, $g'(t)$:

Is negative, so $g$ is decreasing
Is zero, so $g$ is constant
Is positive, so $g$ is increasing, implying $g(x)>g(0)=0$✔️
Is undefined

Correct Answer Logic:

For $t>0$: $g'(t)=e^t-1>0$. So $g$ is strictly increasing for $t>0$, meaning $g(x)>g(0)=0$ for $x>0$, i.e., $e^x-1-x>0$, i.e., $e^x>1+x$. A similar argument with $g$ decreasing for $t<0$ completes the proof for all $x\in\mathbb{R}$.

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Physics QUESTION #7298

Question 7

A particle is thrown vertically upward. Its speed at half the maximum height is $10\text{ m/s}$. The maximum height attained is ($g = 10\text{ m/s}^2$):

8 m
20 m
10 m✔️
16 m

Correct Answer Logic:

Let maximum height $= H$. At height $H/2$, velocity $= 10\text{ m/s}$.

Using $v^2 = u^2 - 2g\cdot\dfrac{H}{2}$: $100 = u^2 - gH$

At max height: $0 = u^2 - 2gH \Rightarrow u^2 = 2gH$

Substituting: $100 = 2gH - gH = gH \Rightarrow H = \dfrac{100}{10} = \mathbf{10\text{ m}}$

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Chemistry QUESTION #7165

Question 8

Arrange the following electrolytes in increasing order of their coagulating power for an arsenious sulphide ($As_{2}S_{3}$) sol: $Na^{+}$, $Al^{3+}$, and $Ba^{2+}$.

$Al^{3+} < Ba^{2+} < Na^{+}$
$Na^{+} < Ba^{2+} < Al^{3+}$✔️
$Ba^{2+} < Na^{+} < Al^{3+}$
$Al^{3+} < Na^{+} < Ba^{2+}$

Correct Answer Logic:

According to the Hardy-Schulze Rule, the coagulating power of an ion is directly proportional to the magnitude of its charge. Since $As_{2}S_{3}$ is a negatively charged sol, the order for cations is:

$Na^{+}$ (Charge: +1)
$Ba^{2+}$ (Charge: +2)
$Al^{3+}$ (Charge: +3)

Thus, $Na^{+} < Ba^{2+} < Al^{3+}$.

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English QUESTION #4417

Question 9

The keys were found __________ the drawer where you left them last week.

under
in✔️
on
beside

Correct Answer Logic:

The preposition 'in' is correct here because keys are located inside a drawer. 'Under' means beneath, 'on' means on top of a surface, and 'beside' means next to — none of these fit the context of being inside a drawer.

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Boilers Mechanical Engineering QUESTION #2540

Question 10

The parallel-axis (Steiner) theorem gives the second moment of area about an axis parallel to the centroidal axis as:

$I=\bar{I}-Ad^2$
$I=\bar{I}\cdot d^2$
$I=\bar{I}+Ad^2$✔️
$I=\frac{\bar{I}}{Ad^2}$

Correct Answer Logic:

Steiner's theorem: $I=\bar{I}+Ad^2$, where $\bar{I}$ is the centroidal second moment, $A$ is the area, and $d$ is the perpendicular distance between the axes. The second moment always increases for axes away from the centroid.

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Ability / HR / Governance / Special Education QUESTION #1863

Question 11

Initial appointments to posts in BPS 1 to 15 shall be made on the recommendations of which body?

Federal Public Service Commission
Selection Board
Departmental Selection Committee after advertising vacancies✔️
Departmental Promotion Committee

Correct Answer Logic:

Rule 11 states initial appointments to posts in BPS 1 to 15 shall be made on the recommendations of the Departmental Selection Committee after the vacancies have been advertised in newspapers.

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Urdu QUESTION #5029

Question 12

بہادر شاہ ظفر کو کہاں قید کیا گیا تھا؟

ممبئی
دہلی
رنگون✔️
ان میں سے کوئی نہیں

Correct Answer Logic:

1857ء کی جنگِ آزادی کے بعد انگریزوں نے بہادر شاہ ظفر کو رنگون (برما) بھیج دیا جہاں 1862ء میں ان کا انتقال ہوا۔

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Accounting & Finance QUESTION #6111

Question 13

Draft loss for year: $320. Adjustments needed: (1) Irrecoverable debts of $930 recovered; (2) Existing allowance $520, required allowance = 5% of trade receivables $9,600. What is the revised profit or loss?

Loss of $1,210
Loss of $1,730
Profit of $130
Profit of $650✔️

Correct Answer Logic:

Option D (Profit of $650) is correct.

Recovery of debt: +$930

Required allowance = 5% × $9,600 = $480; Reduction = $520 − $480 = +$40

Revised = −$320 + $930 + $40 = +$650 profit

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Administration QUESTION #2930

Question 14

What is the primary role of the "Public Service Commission" in Pakistan?

Funding projects
Ensuring merit-based recruitment✔️
Policing the districts
Drafting foreign policy

Correct Answer Logic:

Commissions like the FPSC are constitutional bodies tasked with conducting competitive exams to recruit civil servants based on merit.

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Math (Module-1) QUESTION #5475

Question 15

A right triangle has sides of length $2\sqrt{2}, 6\sqrt{2}$, and $\sqrt{80}$ units. What is the area of the triangle, in square units?

$\sqrt{82} + \sqrt{80}$
12✔️
$24\sqrt{80}$
24

Correct Answer Logic:

Legs are $2\sqrt{2}$ and $6\sqrt{2}$ because $(2\sqrt{2})^2 + (6\sqrt{2})^2 = 8 + 72 = 80 = (\sqrt{80})^2$. Area $= \frac{1}{2} \times 2\sqrt{2} \times 6\sqrt{2} = 12$.

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Islamic Studies QUESTION #7613

Question 16

وہ طلاق جس میں شوہر 'رجوع' کا حق کھو دیتا ہے کہلاتی ہے:

رائی
احسن
بائن✔️
ان میں سے کوئی نہیں

Correct Answer Logic:

طلاق بائن میں شوہر کو رجوع کا حق نہیں ہوتا، البتہ نئے نکاح اور مہر کے ساتھ دوبارہ شادی کر سکتا ہے۔

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Islamic Studies QUESTION #7625

Question 17

حدیث کے متن کے تجزیہ کو اصطلاحاً کیا کہتے ہیں؟

درایت✔️
مصطلحات
اسماء الرجال
احوال الرواة

Correct Answer Logic:

حدیث کے متن کے تجزیہ کو 'درایت' کہتے ہیں جبکہ سند کے تجزیہ کو 'روایت' کہتے ہیں۔

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Math (Module-1) QUESTION #5477

Question 18

Point $O$ is the center of a circle. The measure of arc $RS$ on this circle is $100^\circ$. What is the measure, in degrees, of its associated central angle $ROS$?

$50^\circ$
$100^\circ$✔️
$200^\circ$
$360^\circ$

Correct Answer Logic:

The measure of a central angle is equal to the measure of its intercepted arc.

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Agronomy QUESTION #2061

Question 19

Fertigation is agronomically superior to conventional fertilizer broadcasting because:

It eliminates the need for irrigation entirely
Nutrients are dissolved in irrigation water and delivered directly to the active root zone in synchrony with crop demand, improving nutrient use efficiency, reducing losses, and enabling precise timing and placement✔️
It can only be used with drip irrigation and is therefore limited to horticultural crops
Fertigated nutrients are immediately fixed by soil colloids, preventing any leaching

Correct Answer Logic:

Fertigation — applying dissolved fertilizers through the irrigation system — achieves high NUE by placing nutrients at the root zone when and where needed. It allows split applications synchronized with crop uptake patterns, reduces volatilization and surface runoff losses, and is compatible with drip (most efficient) and sprinkler systems.

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Statistics QUESTION #1993

Question 20

In a randomized complete block design (RCBD) with $t$ treatments and $b$ blocks, the error degrees of freedom is:

$tb - 1$
$(t-1)(b-1)$✔️
$t + b - 1$
$tb - t - b$

Correct Answer Logic:

In RCBD, total df $= tb-1$, treatments df $= t-1$, blocks df $= b-1$. By subtraction, error df $= (tb-1)-(t-1)-(b-1) = tb - t - b + 1 = (t-1)(b-1)$. This is also written as $tb - t - b + 1$, which is identical to $(t-1)(b-1)$.

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