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Chemistry QUESTION #433

Question 761

Which element forms long chains alternating with oxygen?

Carbon
Silicon
Nitrogen
All of these✔️

Correct Answer Logic:

Silicon, carbon and other elements can form chains with oxygen

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Administration QUESTION #9555

Question 762

Under the Rules of Business, a Secretary of a Division is responsible for the day-to-day administration of his Division. A policy matter of major significance arises. What is the correct procedural sequence for policy decision-making under Pakistan's constitutional framework?

Secretary decides and informs the Minister who ratifies the decision for implementation
Secretary prepares and presents the policy brief; Minister provides political direction and policy decision; Cabinet approves if it involves cross-ministerial impact; legislature is informed if it requires statutory change✔️
Federal Public Service Commission is consulted; Secretary implements after FPSC clearance; Minister signs off for political accountability
National Economic Council is convened for all major policy decisions, which are then forwarded to the Prime Minister for approval before Secretaries can act

Correct Answer Logic:

Under the Rules of Business, the Secretary is the administrative head responsible for preparing policy briefs and implementing decisions, but policy direction comes from the Minister (political head). Matters requiring cross-ministerial coordination or statutory change go to the Cabinet. This sequence reflects the constitutional structure of parliamentary government where elected ministers are accountable to the legislature.

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Dairy Food Science and Technology QUESTION #5877

Question 763

The alcoholic acidity test on milk works on the principle that:

Alcohol raises the pH of milk
Unstable proteins due to high acidity or colostrum precipitate in alcohol✔️
Fat globules dissolve in alcohol revealing acidity
Lactose ferments rapidly in alcohol

Correct Answer Logic:

The alcohol precipitation test relies on ethanol ($68\text{–}72\%$) dehydrating proteins. Milk with elevated acidity, high calcium ions, or abnormal protein (colostrum, mastitic milk) has destabilized casein micelles that precipitate upon alcohol addition.

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Urdu QUESTION #5058

Question 764

اس شعر میں علمِ بیان کی کون سی صورت آئی ہے؟ وہ صبح اور وہ چھاؤں ستاروں کی...

تشبیہ✔️
استعارہ
مجازِ مرسل
کنایہ

Correct Answer Logic:

اس شعر میں تشبیہ استعمال ہوئی ہے جہاں کسی چیز کو کسی دوسری سے تشبیہ دی گئی ہے۔

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Mathematics QUESTION #1256

Question 765

Let $N$ be a normal subgroup of $G$ and $H$ a subgroup of $G$. Which of the following is a subgroup of $G$?

$N \cap H$
$N \cup H$
$NH = \{nh : n\in N, h\in H\}$
Both (A) and (C)✔️

Correct Answer Logic:

Both $N\cap H$ (intersection of subgroups) and $NH$ (product set when $N$ is normal) are subgroups of $G$. The union $N\cup H$ is generally NOT a subgroup. Since the question asks which one from the listed options forms a subgroup, and option (D) correctly identifies both valid subgroup constructions, (D) is the complete answer.

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Mathematics QUESTION #1265

Question 766

Using the Mean Value Theorem, which inequality holds for all $x\in\mathbb{R}$?

$e^x \leq 1+x$
$e^x \geq 1+x$✔️
$e^x = 1+x$ for all $x$
$e^x \geq x$ only for $x>0$

Correct Answer Logic:

Define $f(t)=e^t$. By MVT on $[0,x]$: $e^x - e^0 = e^c \cdot x$ for some $c\in(0,x)$. Since $e^c \geq e^0=1$ for $c\geq0$, we get $e^x-1\geq x$, i.e. $e^x\geq 1+x$. A similar argument applies for $x<0$.

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English QUESTION #8563

Question 767

What does the idiom 'to be at loggerheads' mean?

To cooperate with enemies
To be in strong disagreement or dispute✔️
To face stiff opposition
To tax one's mind and body

Correct Answer Logic:

'At loggerheads' means in disagreement.

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Paper-I (Anatomy/Physiology and Biochemistry/Microbiology) QUESTION #3433

Question 768

'Lipolysis' is the process of:

Building fat
Breaking down triglycerides into glycerol and fatty acids✔️
Storing sugar
Absorbing water

Correct Answer Logic:

Occurs when the body needs energy during fasting or exercise.

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Chemistry QUESTION #442

Question 769

AlI? (Aluminium Iodide) is electrically a __________

Conductor
Non-conductor✔️
Semiconductor
None of these

Correct Answer Logic:

AlI? is covalent and non-conducting in pure form

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Civil / Architecture QUESTION #2354

Question 770

The Atterberg limit defining the minimum water content at which a soil behaves as a liquid (loses shear strength) and can be quantified by the Casagrande apparatus is:

Plastic Limit (PL)
Shrinkage Limit (SL)
Liquid Limit (LL)✔️
Flow Limit (FL)

Correct Answer Logic:

The Liquid Limit (LL) is the minimum water content at which a soil flows as a liquid under a small standardized shear force. It is determined using the Casagrande cup apparatus (25 blows to close a groove) or the cone penetrometer. The Plastic Limit (PL) is the minimum water content at which soil can be rolled into a 3 mm thread. The Plasticity Index PI = LL - PL.

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Agronomy QUESTION #2043

Question 771

The term 'luxury consumption' of nutrients by plants refers to:

Deficiency symptoms appearing despite adequate soil nutrient levels
Uptake of a nutrient above the level required for maximum growth when that nutrient is in excess supply, without proportional increase in yield✔️
The process of active transport of nutrients against concentration gradients
The preferential uptake of macronutrients over micronutrients

Correct Answer Logic:

Luxury consumption occurs when a nutrient is present in excess — the plant absorbs more than needed for maximum growth without a corresponding yield increase. Potassium is the classic example: plants absorb K above requirements when soil K is high, which can induce Mg and Ca deficiencies (antagonism) and waste fertilizer.

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General Science and Ability QUESTION #248

Question 772

The chemical formula for alum is:

KAl(SO4)2⋅12H2O✔️
KSi(SO4)2⋅12H2O
KAl(SO4)2⋅8H2O
None of these

Correct Answer Logic:

Potassium alum is a double sulfate of potassium and aluminum with 12 water molecules.+2

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Psychology QUESTION #9759

Question 773

Which theory proposes that individuals learn attitudes by observing their own behaviour?

Operant conditioning
CR
Self-perception✔️
None of these

Correct Answer Logic:

Self-perception theory (Daryl Bem) suggests people form attitudes by observing their own behaviour, much like they infer others' attitudes from their behaviour. It differs from operant conditioning (reward/punishment) and classical conditioning.

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Disaster Management QUESTION #6546

Question 774

In addressing the gap between DRR policy and implementation, what represents the most critical missing link?

More policies
Operational frameworks with clear responsibilities, adequate resources, technical capacity, and accountability mechanisms✔️
Better documentation
International expertise

Correct Answer Logic:

Section 1.4 identifies gaps including weak integration, limited capacity, and insufficient financing. Bridging policy-implementation gaps requires translating strategic goals into operational plans with assigned responsibilities, allocated resources, capacity building, and accountability systems.

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General Knowledge QUESTION #8855

Question 775

One of the main objectives of the All-India Muslim League at its founding in 1906 was:

To be loyal to the British government✔️
To take active part in Indian politics
To be close to the Hindu community
Not to take sides with any Indian community

Correct Answer Logic:

The League initially sought British loyalty.

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Civil Engineering QUESTION #6586

Question 776

An airport site selection criterion requires that the site should:

Be in close proximity to residential areas and schools
Have frequent smoke and haze conditions
Have several airports in the same metropolitan area
None of the above (avoid all the listed conditions)✔️

Correct Answer Logic:

Correct airport siting criteria include:

Away from residential areas and schools (noise)
Clear atmosphere, free from smoke/haze (visibility)
Adequate spacing from other airports
Good drainage and level terrain

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Chemistry QUESTION #7509

Question 777

The volume occupied by 4.75 g of acetylene gas (C$_2$H$_2$) at 50°C and 740 mmHg pressure is approximately _____ L.
$[R = 0.0826\ \text{L atm K}^{-1}\ \text{mol}^{-1}]$

6 L✔️
7 L
5 L
8 L

Correct Answer Logic:

Molar mass of C$_2$H$_2 = 2(12) + 2(1) = 26\ \text{g/mol}$

Moles $= \dfrac{4.75}{26} \approx 0.1827\ \text{mol}$

$T = 50 + 273 = 323\ \text{K}$

$P = \dfrac{740}{760}\ \text{atm} \approx 0.9737\ \text{atm}$

$V = \dfrac{nRT}{P} = \dfrac{0.1827 \times 0.0826 \times 323}{0.9737} \approx \dfrac{4.875}{0.9737} \approx \mathbf{6}\ \text{L}$

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Security Measures to Maintain Law and Order QUESTION #844

Question 778

"Access Control" at an airport is a security measure primarily intended to:

Count passengers
Maintain Law & Order✔️
Speed up boarding
Reduce staff costs

Correct Answer Logic:

Access control ensures only authorized personnel enter sensitive areas, preventing breaches of order.

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General Abilities QUESTION #4519

Question 779

Simplify: $\sqrt{36} \times \sqrt{4}$

$\sqrt{40}$
$12$✔️
$\sqrt{144}$
$72$

Correct Answer Logic:

$\sqrt{36} \times \sqrt{4} = 6 \times 2 = 12$. Alternatively, $\sqrt{36 \times 4} = \sqrt{144} = 12$

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General Abilities QUESTION #7662

Question 780

If $\log_{10} 2$, $\log_{10}(2^x - 1)$, and $\log_{10}(2^x + 3)$ are three consecutive terms of an arithmetic progression, which of the following is the value of $x$?

$x = \log_2 2$
$x = \log_2 5$✔️
$x = \log_2 3$
None of these

Correct Answer Logic:

For three terms to be in AP, $2 \cdot \log_{10}(2^x - 1) = \log_{10} 2 + \log_{10}(2^x + 3)$. This simplifies to $\log_{10}(2^x - 1)^2 = \log_{10}[2(2^x + 3)]$. Therefore, $(2^x - 1)^2 = 2(2^x + 3)$. Expanding: $2^{2x} - 2 \cdot 2^x + 1 = 2 \cdot 2^x + 6$. Simplifying: $2^{2x} - 4 \cdot 2^x - 5 = 0$. Let $y = 2^x$: $y^2 - 4y - 5 = 0$, giving $(y-5)(y+1) = 0$. Since $y > 0$, $y = 5$, so $2^x = 5$ and $x = \log_2 5$.

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