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General Science and Ability QUESTION #262

Question 3141

Why red light is used in traffic signal for danger?

Short wavelength
High frequency
Long wavelength and high frequency
Long wavelength and short frequency✔️

Correct Answer Logic:

Red light has the longest wavelength in the visible spectrum and scatters the least.+1

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Accounting & Finance QUESTION #6119

Question 3142

Data: Average inventory $15,000; Rate of inventory turnover 8 times; Mark-up 25%. What is the business's revenue (sales)?

$144,000
$150,000✔️
$160,000
$210,000

Correct Answer Logic:

Option B ($150,000) is correct.

COGS = 8 × $15,000 = $120,000

Mark-up 25%: Revenue = $120,000 × 1.25 = $150,000

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Chemistry QUESTION #5548

Question 3143

Arrange the ionic radii of $N^{3-}$, $O^{2-}$, and $F^-$ in correct increasing order (in Å):

1.36, 1.40 and 1.71 respectively
1.36, 1.71 and 1.40 respectively
1.71, 1.40 and 1.36 respectively✔️
1.71, 1.36 and 1.40 respectively

Correct Answer Logic:

All three ions are isoelectronic (10 electrons each). As nuclear charge increases ($N(7) < O(8) < F(9)$), the electrons are pulled closer, so ionic radius decreases. Therefore: $r(N^{3-}) > r(O^{2-}) > r(F^-)$, i.e., 1.71 Å > 1.40 Å > 1.36 Å.

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Urdu QUESTION #5144

Question 3144

دیارِ عشق میں اپنا مقام پیدا کر، کس شاعر کا مصرع ہے؟

میر تقی میر
غالب
اقبال✔️
فیض

Correct Answer Logic:

دیارِ عشق میں اپنا مقام پیدا کر علامہ اقبال کا مشہور مصرع ہے۔

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Geography QUESTION #6324

Question 3145

The concept of 'geopolitics of uneven development' primarily examines:

Natural resource distribution creating power asymmetries between states
Historical colonial relationships perpetuating economic disparities
Spatial patterns of wealth accumulation and political power relationships✔️
Geographic determinism in national development trajectories

Correct Answer Logic:

Geopolitics of uneven development (drawing from world-systems theory and Marxist geography) examines how spatial patterns of capital accumulation, wealth concentration, and economic development create and perpetuate asymmetric power relationships between core, periphery, and semi-periphery regions.

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Planning QUESTION #4945

Question 3146

What is the primary function of a buffer zone in land use planning?

To increase development density
To separate incompatible land uses✔️
To maximize land utilization
To reduce planning costs

Correct Answer Logic:

Buffer zones (green belts, transitional uses) separate incompatible land uses (like industrial from residential) to minimize conflicts, reduce negative impacts, and improve quality of life.

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Urdu QUESTION #5114

Question 3147

خدائے سخن کس کو کہتے ہیں؟

اسداللہ خان غالب
ابنِ انشا
میر تقی میر✔️
میر درد

Correct Answer Logic:

میر تقی میر کو 'خدائے سخن' کہا جاتا ہے۔ انہیں اردو شاعری میں سب سے اعلیٰ مقام حاصل ہے۔

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Information Technology QUESTION #1144

Question 3148

Which protocol is used to map an IP address to a physical (MAC) address?

DNS
DHCP
ARP✔️
ICMP

Correct Answer Logic:

Address Resolution Protocol (ARP) is used to discover the hardware address of a device when only its IP address is known.

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Math Physics Chemistry Biology QUESTION #7726

Question 3149

Enzymatic activity can be reduced by which of the following agents?

Heavy metal ions✔️
Methane
Mutase
Noble gases

Correct Answer Logic:

Heavy metal ions (like Hg²⁺, Pb²⁺, Ag⁺) bind to sulfhydryl (-SH) groups on enzymes, causing denaturation or inhibition. Methane is inert, mutase is an enzyme, and noble gases are chemically unreactive.

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General Knowledge QUESTION #8883

Question 3150

Who wrote 'The Clash of Civilizations and the Remaking of World Order'?

Francis Fukuyama
Hans J. Morgenthau
Noam Chomsky
Samuel P. Huntington✔️

Correct Answer Logic:

Huntington wrote The Clash of Civilizations.

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English QUESTION #8302

Question 3151

I said to Hamid, 'Always speak the truth.' Choose the correct indirect sentence:

I request Hamid to speak the truth always.
I asked Hamid speak the truth always.
I advised Hamid to speak the truth always.✔️
I told Hamid to speak the truth always.

Correct Answer Logic:

'Advised' is appropriate for giving moral instruction.

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Security Measures to Maintain Law and Order QUESTION #861

Question 3152

If an officer witnesses a colleague using excessive force, their "Professional Duty" is to:

Help the colleague
Report the incident✔️
Stay silent
Resign

Correct Answer Logic:

Professional conduct and the Pakistan Army Act (applicable via 7-A) require reporting of illegal acts or misconduct.

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Nursing QUESTION #9146

Question 3153

A breastfeeding mother asks when she should introduce complementary foods to her infant. According to WHO guidelines, the CORRECT advice is:

Start semi-solid foods at 4 months to prevent allergies
Exclusive breastfeeding for 6 months, then introduce complementary foods while continuing breastfeeding up to 2 years✔️
Start formula supplementation at 3 months to ensure adequate nutrition
Wean completely from breast at 12 months and start cow's milk

Correct Answer Logic:

WHO Infant Feeding Recommendations (2021):

Initiation: Breastfeeding within 1 hour of birth
Exclusive breastfeeding (EBF): For the first 6 months of life
- No water, formula, other liquids or solids (except medicines/vitamins)
- Breast milk provides all nutritional and immunological needs
Complementary feeding: Introduce at 6 months while continuing breastfeeding
Continue breastfeeding: Up to 2 years or beyond

Benefits of EBF:

Reduces infant mortality from diarrhea (by 11×) and pneumonia (by 15×)
Optimal brain development (DHA, ARA)
Immunoglobulins (especially sIgA in colostrum)
Maternal benefits: reduces risk of breast/ovarian cancer, aids weight loss
LAM (Lactational Amenorrhea Method): $>98\%$ contraceptive efficacy if EBF + amenorrhea + $<6$ months postpartum

Colostrum = first milk, produced days 1–3: high protein, low fat, rich in IgA, lactoferrin, leukocytes — called 'liquid gold'.

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Electrical Engineering QUESTION #2161

Question 3154

Using Norton's theorem, a circuit has $I_N = 4\,\text{A}$ and $R_N = 6\,\Omega$. The maximum power deliverable to a load is:

$24\,\text{W}$✔️
$48\,\text{W}$
$12\,\text{W}$
$96\,\text{W}$

Correct Answer Logic:

Maximum power transfer requires $R_L = R_N = 6\,\Omega$. Thevenin voltage $V_{th} = I_N R_N = 24\,\text{V}$. $P_{max} = \frac{V_{th}^2}{4R_N} = \frac{576}{24} = 24\,\text{W}$.

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Journalism / Mass Communication QUESTION #6370

Question 3155

The halftone process, introduced in 1881, was a critical innovation for journalism. Which of the following BEST describes why it mattered?

It allowed newspapers to print in multiple colours for the first time
It made possible the accurate reproduction of photographs in books and newspapers, enabling news photography and photojournalism✔️
It was the first method of printing photographs on metallic surfaces
It allowed wireless transmission of images between cities before satellite technology

Correct Answer Logic:

Before the halftone process (introduced in 1881), photographs could not be directly reproduced in print media. Images in newspapers were limited to hand-drawn illustrations, woodcuts, and engravings. The halftone process converted continuous-tone photographs into a pattern of tiny dots of varying sizes, which could be printed alongside text using standard printing presses. This meant that for the first time, photographs could appear in newspapers and books, creating the conditions for photojournalism — the use of photographs to document news events and drive public opinion. Combined with improvements like dry plates, smaller portable cameras, and George Eastman's Kodak box camera (1888) with roll film, the halftone process transformed print journalism from a primarily word-based medium to a powerful visual medium, enabling photographic documentation of wars, social conditions, and major public events.

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Physics QUESTION #394

Question 3156

The cobalt is absorbed by

Bones
Skin
Liver✔️
Thyroid gland

Correct Answer Logic:

Radioactive cobalt accumulates in liver

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General Abilities QUESTION #7995

Question 3157

$3^{72/100}$ written as a fraction is:

3.72
37.2
0.372✔️
372

Correct Answer Logic:

$3^{72/100} = 3.72$ — wait, this is a notation question. $3\tfrac{72}{100} = 3 + 0.72 = 3.72$ as a decimal, or $\dfrac{372}{100} = 0.372$ when simplified... The answer key gives C (0.372). Note: $\dfrac{372}{100} = 3.72$ not 0.372. Answer key may contain a typo; the mixed number $3\tfrac{72}{100} = 3.72$.

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Administration QUESTION #9540

Question 3158

Max Weber distinguished three ideal types of authority. A newly appointed district officer who commands obedience solely because citizens respect the office of DCO, rather than the individual's personal qualities or ancestral lineage, is exercising which type?

Traditional authority derived from historical precedent
Charismatic authority arising from personal magnetism
Rational-legal authority vested in the position itself✔️
Expert authority derived from technical competence

Correct Answer Logic:

Weber's rational-legal authority is attached to the position (office), not the person. Citizens comply because law and formal structure mandate it. This is distinguished from traditional authority (inherited) and charismatic authority (personal traits).

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