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Chemistry QUESTION #4347

Which of the following best explains why phenol reacts with aqueous $NaOH$, but alcohols do not?

Phenol has a lower boiling point than alcohol
Alcohols contain a strong O-H bond that cannot be broken by weak bases
Phenol forms hydrogen bonding that facilitates ionization
Phenol is weakly acidic due to resonance stabilization of phenoxide ion✔️

Correct Answer Logic:

Phenol ($C_6H_5OH$) is acidic ($pK_a \approx 10$) because the phenoxide ion ($C_6H_5O^-$) is stabilized by resonance with the benzene ring. Alcohols are not acidic enough to react with $NaOH$.

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Disaster Management QUESTION #6532

Question 3362

A school safety program focuses solely on structural retrofitting. What critical component is missing for comprehensive school safety?

Additional funding
Integration of DRR education in curricula, emergency drills, and non-structural safety measures✔️
More engineers
Government approval

Correct Answer Logic:

Section 11.1 references the Pakistan School Safety Framework (PSSF), which encompasses structural safety, non-structural measures (securing equipment), emergency preparedness (drills), and DRR education. Comprehensive school safety requires all pillars, not just structural interventions.

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Civil Engineering QUESTION #6565

Question 3363

In the SI system of units, the standard unit of force is:

Pound
Newton✔️
Kilogram
All of the above

Correct Answer Logic:

In SI (Système International), the unit of force is the Newton (N), defined as $1\,\text{N} = 1\,\text{kg}\cdot\text{m/s}^2$. Pound belongs to the Imperial system and Kilogram is a unit of mass.

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Mathematics QUESTION #1294

Question 3364

If $\vec{a}\times(\vec{b}\times\vec{c}) = (\vec{a}\times\vec{b})\times\vec{c}$, what can be concluded about $\vec{a}$ and $\vec{c}$?

They are perpendicular
They are parallel✔️
Their magnitudes are equal
Their dot product is 1

Correct Answer Logic:

Expand both sides using the BAC-CAB rule. LHS: $\vec{b}(\vec{a}\cdot\vec{c})-\vec{c}(\vec{a}\cdot\vec{b})$. RHS: $\vec{a}(\vec{b}\cdot\vec{c})-\vec{b}(\vec{a}\cdot\vec{c})$. Setting equal and simplifying yields $(\vec{a}\times\vec{c})\times\vec{b}=\vec{0}$ for all $\vec{b}$, which implies $\vec{a}\times\vec{c}=\vec{0}$, meaning $\vec{a}$ and $\vec{c}$ are parallel.

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General Knowledge QUESTION #8996

Question 3365

Who is the founder of the Scout Movement?

Robert Baden-Powell✔️
Lord Colin Powell
Maccollins
Nikola Tesla

Correct Answer Logic:

Baden-Powell founded the Scouting movement.

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Verbal Reasoning QUESTION #8163

Question 3366

A graduating class has 236 students. Among them, 142 enrolled in algebra and 121 enrolled in chemistry. What is the greatest possible number of students who could have taken both algebra and chemistry?

$100$
$110$
$121$✔️
$142$

Correct Answer Logic:

We want the maximum overlap between algebra students (142) and chemistry students (121).

The overlap is maximized when every chemistry student also took algebra (since 121 < 142, this is possible).

Maximum overlap $= \min(142, 121) = \mathbf{121}$.

Check: if 121 students took both, then students taking at least one subject $= 142 + 121 - 121 = 142 \leq 236$. ✓

So the greatest possible number is $121$.

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Physics QUESTION #7017

Question 3367

A mass of $10\text{ kg}$ is suspended vertically by a rope. A horizontal force is applied to the rope at a specific point, causing the rope at the ceiling to deviate by an angle of $45^\circ$. If the system is in equilibrium, what is the magnitude of the horizontal force? (Assume $g = 10\text{ ms}^{-2}$)

$200\text{ N}$
$140\text{ N}$
$70\text{ N}$
$100\text{ N}$✔️

Correct Answer Logic:

At equilibrium, the horizontal component of the tension $T \sin(45^\circ)$ equals the applied force $F$, and the vertical component $T \cos(45^\circ)$ equals the weight $mg$. Dividing the two equations gives $F = mg \tan(45^\circ)$. Since $\tan(45^\circ) = 1$ and $mg = 10 \times 10 = 100$, the force $F = 100\text{ N}$.

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English QUESTION #7637

Question 3368

Change the voice: Will she not have sung the song?

Will a song not have been sung by her?✔️
Will she have not been sung a song?
Will have a song not been sung by her?
None of these

Correct Answer Logic:

When changing from active to passive voice, the object becomes the subject. The structure 'Will...not have sung' (active) becomes 'Will...not have been sung' (passive). The agent 'by her' is added at the end.

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General Knowledge QUESTION #9023

Question 3369

Rafael Nadal is a famous player in which sport?

Football
Tennis✔️
Table Tennis
Hockey

Correct Answer Logic:

Rafael Nadal is a tennis legend.

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General Knowledge QUESTION #4811

Question 3370

The political theory that leaders initiate foreign conflicts to divert public attention from domestic controversies is known as?

Diversionary Theory of War✔️
Democratic Peace Theory
Autocratic Rule
Realpolitik

Correct Answer Logic:

The Diversionary Theory of War suggests that political leaders may initiate or escalate international conflicts to divert public attention from domestic problems such as economic downturns or political scandals.

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MCQs Section QUESTION #5222

Question 3371

'آدے آنا' محاورہ ہے اس کا کیا مطلب ہے؟

لڑائی کرنا
درمیان میں آنا✔️
مدد کرنا
ان میں سے کوئی نہیں

Correct Answer Logic:

آدے آنا محاورے کا مطلب ہے بیچ میں آنا یا کسی معاملے میں مداخلت کرنا۔

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Paper-I (Anatomy/Physiology and Biochemistry/Microbiology) QUESTION #3490

Question 3372

'Digitalis purpurea' (Foxglove) contains glycosides used as:

Laxatives
Cardiotonics (Heart stimulants)✔️
Sedatives
Antiseptics

Correct Answer Logic:

Digitalis increases the force of heart contraction in heart failure.

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Administration QUESTION #9548

Question 3373

Pakistan's administrative structure inherited from the British period retains several features introduced during colonial rule. The principle that civil servants should provide services 'without bias' — meaning that the 'self' of the individual is not involved in official decisions — corresponds to which Weberian characteristic of bureaucracy?

Specialization and division of labour ensuring task clarity
Impersonality ensuring that official acts are detached from personal interests and identities✔️
Hierarchy of authority ensuring clear lines of command and accountability
Promotion based on achievement ensuring merit-based advancement

Correct Answer Logic:

Weber's concept of 'impersonality' (Sachlichkeit) means that official transactions are conducted without personal favor, prejudice or involvement of the official's own interests or identity. This corresponds directly to W.F. Willoughby's concept of 'value-free' service — the notion that public servants should act neutrally and without discrimination.

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Physics QUESTION #7072

Question 3374

Two radioactive isotopes, $A$ and $B$, have half-lives of $20$ minutes and $40$ minutes, respectively. If both samples start with an identical number of nuclei, determine the ratio of the number of decayed nuclei of $A$ to those of $B$ after a period of $80$ minutes.

$4:1$
$1:4$
$5:4$✔️
$1:16$

Correct Answer Logic:

After $80$ minutes, $A$ undergoes $4$ half-lives ($80/20$), leaving $N_A = N_0/2^4 = N_0/16$. The number of decayed nuclei for $A$ is $N_0 - N_0/16 = 15N_0/16$. $B$ undergoes $2$ half-lives ($80/40$), leaving $N_B = N_0/2^2 = N_0/4$. The number of decayed nuclei for $B$ is $N_0 - N_0/4 = 3N_0/4 = 12N_0/16$. The ratio of decayed nuclei is $15:12$, which simplifies to $5:4$.

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General Science and Ability QUESTION #261

Question 3375

A cyclone is formed:

When warm air rises upward
When moist air rises upward
When moist air is pressed downward
When warm, moist air rises upward✔️

Correct Answer Logic:

Cyclones form over warm ocean waters when warm, moist air rises and creates low pressure.+1

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MCQs Section QUESTION #5242

Question 3376

مفرد بحروں کی تعداد کتنی ہے؟

سات
پانچ
گیارہ✔️
نو

Correct Answer Logic:

علمِ عروض میں مفرد بحروں کی تعداد گیارہ ہے۔

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Physics QUESTION #6987

Question 3377

Two capacitors $C_1$ and $C_2$ are charged to 120 V and 200 V respectively. When connected together, the potential on each becomes zero. Which relation holds?

$5C_1 = 3C_2$
$3C_1 = 5C_2$✔️
$3C_1 + 5C_2 = 0$
$9C_1 = 4C_2$

Correct Answer Logic:

For the potential to become zero after connection, the total charge must be zero (charges cancel). Taking signs into account:

$Q_1 - Q_2 = 0 \Rightarrow C_1 \times 120 = C_2 \times 200$

$\frac{C_1}{C_2} = \frac{200}{120} = \frac{5}{3}$

$\Rightarrow 3C_1 = 5C_2$

The capacitors must have been charged with opposite polarities so that when connected, charges cancel. Conservation of charge gives $120C_1 = 200C_2$, yielding $3C_1 = 5C_2$.

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Islamic Studies QUESTION #654

Question 3378

The "Year of the Elephant" (Am al-Fil) is associated with the birth of:

Hazrat Abu Bakr
The Holy Prophet (ﷺ)✔️
Hazrat Ali
None of these

Correct Answer Logic:

It refers to the year 570 CE, when the Prophet (ﷺ) was born.

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Education QUESTION #6890

Question 3379

Which of the following BEST explains why 'conflict resolution' and 'peer mediation' have been found to be relatively ineffective as bullying prevention strategies?

These strategies require too much time and are logistically difficult to implement
Bullying results from a power imbalance, not a social skills deficit, and bullies typically have strong social manipulation skills✔️
Conflict resolution requires trained counselors who are rarely available in schools
Peer mediation encourages students to trivialize bullying by treating it as a normal conflict

Correct Answer Logic:

Research shows that bullies are not typically socially incompetent — they often deliberately exploit their environment and manipulate situations based on victims' reactions, indicating strong if antisocial social awareness. Since bullying is a power-based phenomenon rather than a mutual conflict, strategies targeting conflict resolution or social skills deficits do not address the actual mechanism.

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Dairy Food Science and Technology QUESTION #5902

Question 3380

The phenomenon of lactose crystallization in concentrated milk products causing a gritty texture is called:

Syneresis
Maillard browning
Sandiness due to $\alpha$-lactose monohydrate crystal formation (crystals $>30\;\mu\text{m}$)✔️
Creaming

Correct Answer Logic:

When lactose supersaturation occurs in condensed or sweetened condensed milk or ice cream, large $\alpha$-lactose monohydrate crystals ($>30\;\mu\text{m}$) form causing sandiness or grittiness. Control involves rapid cooling, seeding with fine lactose crystals, or use of lactase.

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