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Chemistry QUESTION #7139

Which of the following crystal defects occurs when an ion is displaced from its regular lattice site to an interstitial position?

Schottky defect
Frenkel defect✔️
Metal deficiency defect
Vacancy defect

Correct Answer Logic:

The Frenkel defect is a dislocation defect where an ion (usually the smaller cation) leaves its original lattice site and occupies an interstitial space. This creates a vacancy at the original site but does not change the overall density of the crystal.

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Planning QUESTION #4993

Question 2722

What is the primary limitation of the Concentric Zone Model (Burgess Model)?

Ignores transportation corridors
Assumes monocentric development only✔️
Overemphasizes industrial zones
Excludes residential areas

Correct Answer Logic:

The Burgess Concentric Zone Model (1925) assumes a single central business district with zones expanding outward in concentric circles, failing to account for multiple nuclei, sector development along transport routes, or polycentric urban forms common in modern cities.

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Administration QUESTION #9587

Question 2723

Schein's model of organizational culture identifies three levels: artifacts, espoused values, and underlying assumptions. A new CEO announces a public commitment to innovation but the organization continues to punish failure. At which level does the real culture reside, and what does this reveal about cultural change management?

At the artifacts level — the innovation posters and speeches are the culture; changing them is sufficient to change the organization
At the underlying assumptions level — the actual culture is the deep, unconscious belief that failure is unacceptable; this is the hardest level to change and requires sustained behavioral intervention to surface and challenge these assumptions✔️
At the espoused values level — the CEO's public commitment is the culture; it needs to be reinforced through formal policy before it becomes real
At the artifacts level — because only observable behaviors constitute organizational culture; psychological assumptions are outside management's control

Correct Answer Logic:

Schein's model is hierarchical: artifacts (visible) reflect espoused values (stated beliefs) which may mask underlying assumptions (unconscious, taken-for-granted beliefs). When behavior contradicts stated values, the underlying assumptions are controlling conduct. Punishing failure despite 'valuing innovation' reveals the deep assumption that failure is dangerous — the hardest cultural level to change because it is rarely articulated or examined.

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Physics QUESTION #7008

Question 2724

Two magnetic materials A and B have different hysteresis loops. Material A has a wide, large-area loop and material B has a narrow, small-area loop. For use in electric generators, transformer cores, and electromagnet cores, the correct assignment is:

A for electromagnets and B for electric generators
A for transformers and B for electric generators
B for electromagnets and transformers✔️
A for electric generators and transformers

Correct Answer Logic:

Key properties:

Wide hysteresis loop (A): High retentivity and high coercivity — hard magnetic material. Good for permanent magnets (used in electric generators).
Narrow hysteresis loop (B): Low retentivity, low coercivity, low energy loss per cycle — soft magnetic material. Ideal for transformers and electromagnets (needs to magnetise/demagnetise repeatedly with low loss).

Electric generators use permanent magnets (wide loop, material A). Transformers and electromagnets use soft material (B). So Option C is correct.

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Paper-I (Anatomy/Physiology and Biochemistry/Microbiology) QUESTION #3182

Question 2725

Which type of immunity is acquired when a person is 'Vaccinated'?

Innate Immunity
Passive Natural Immunity
Active Artificial Immunity✔️
Passive Artificial Immunity

Correct Answer Logic:

Vaccination stimulates the body's own immune system to produce antibodies and memory cells.

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Physics QUESTION #4386

Question 2726

A fluid is flowing through a tube. To undergo transition from laminar to turbulent flow, its velocity must be:

Slightly less than critical velocity
Equal to critical velocity
Greater than critical velocity✔️
Increasing gradually but less than critical velocity

Correct Answer Logic:

Flow transitions from laminar to turbulent when the Reynolds number $Re = \dfrac{\rho v d}{\eta}$ exceeds a critical value. This occurs when fluid velocity exceeds the critical velocity.

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Agronomy QUESTION #2038

Question 2727

Hermetic storage technology for grain preservation works on the principle of:

Maintaining grain at constant low temperature using refrigeration
Creating a modified atmosphere inside an airtight container where respiration of grain, insects, and fungi consumes O₂ and raises CO₂, killing pests without chemicals✔️
Treating grain with phosphine gas before sealing
Using UV-treated bags to prevent insect entry

Correct Answer Logic:

Hermetic (airtight) storage exploits the biological process: grain, insects, and microbes respire, consuming O₂ and producing CO₂ within the sealed container. The resulting hypoxic/hypercapnic atmosphere kills insects and suppresses fungal growth without chemical inputs — ideal for smallholder grain storage.

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Verbal Reasoning QUESTION #8102

Question 2728

$t$ is a positive integer and $\dfrac{4}{7} = \dfrac{t}{s}$.

Compare:

Column A: $s$

Column B: $7$

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:

From $\dfrac{4}{7} = \dfrac{t}{s}$, we get $s = \dfrac{7t}{4}$.

Since $t$ is a positive integer, different values of $t$ yield different results:

If $t = 4$: $s = 7$ → Column A $=$ Column B (equal)
If $t = 8$: $s = 14 > 7$ → Column A is greater
If $t = 2$: $s = 3.5 < 7$ → Column B is greater

Since the result changes depending on $t$, the relationship cannot be determined from the information given.

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Paper-II (Pharmacognosy and Pharmaceutics-I) QUESTION #3585

Question 2729

Which classification system is most useful for detecting 'Adulteration' in organized drugs?

Chemical
Taxonomical
Morphological✔️
Alphabetical

Correct Answer Logic:

Morphological classification studies the external features, making it easier to spot physical substitutes.

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Psychology QUESTION #9858

Question 2730

The difficulty with type theories of personality is that they are:

Too simple
Too contradictory
Too arbitrary
All of these✔️

Correct Answer Logic:

Type theories face multiple criticisms: too simple (forcing complex personalities into discrete categories), too contradictory (types don't hold across cultures and situations), and too arbitrary (choice of types lacks empirical grounding). All three apply.

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Paper-II (Pharmacognosy and Pharmaceutics-I) QUESTION #3023

Question 2731

The most common base used for rectal suppositories is:

Glycerin
Cocoa Butter (Theobroma Oil)✔️
Polyethylene Glycol
Gelatin

Correct Answer Logic:

Cocoa butter is the classic suppository base due to its melting point near body temperature.

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General Knowledge QUESTION #11583

Question 2732

What type of network covers a single building or localised office campus?

WAN
MAN
LAN✔️
PAN

Correct Answer Logic:

A LAN (Local Area Network) connects computers within a limited geographic area — a home, school, office, or building. LANs use Ethernet (wired) or Wi-Fi (wireless) with speeds from 100 Mbps to 10 Gbps. WAN = Wide Area (cities/countries); MAN = Metropolitan Area (city-wide); PAN = Personal Area (very short range).

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Education QUESTION #7562

Question 2733

The primary goal of teaching is considered to be:

To give information
To improve pupils in activities
To impart knowledge
Desirable change in behavior✔️

Correct Answer Logic:

The ultimate goal of teaching is to bring about a positive and desirable change in learners' behavior, knowledge, skills, attitudes, or values.

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Education QUESTION #6888

Question 2734

In designing outdoor activities as part of the curriculum, which of the following is a PREREQUISITE condition that must be satisfied before any outdoor activity can be undertaken, according to sound classroom management principles?

Students must first demonstrate exemplary classroom behavior for a defined period
Outdoor activities must be manageable, age-appropriate, aligned with curriculum objectives, and preceded by student training✔️
The principal must personally approve every outdoor activity before it is conducted
Parental consent must be individually obtained for each outdoor excursion

Correct Answer Logic:

Outdoor activities are a legitimate part of the curriculum but require careful management prerequisites: they must be safe, developmentally appropriate, curriculum-aligned, time-bound, and students must receive prior preparation. Teachers must also be trained to handle outdoor contexts. These conditions collectively prevent the loss of control that can occur outside the structured classroom.

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Pakistan Affairs QUESTION #9049

Question 2735

The official language of Pakistan is:

English
Urdu
Both English and Urdu✔️
Punjabi

Correct Answer Logic:

Pakistan has two official languages: Urdu and English.

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Chemistry QUESTION #7788

Question 2736

What mass of $\mathrm{Al}_2\mathrm{O}_3$ is produced from 18.5 g Al? $4\mathrm{Al} + 3\mathrm{O}_2 \rightarrow 2\mathrm{Al}_2\mathrm{O}_3$

30.8 g
32.6 g
34.9 g✔️
36.5 g

Correct Answer Logic:

Molar mass Al = 27 g/mol: moles Al = 18.5/27 = 0.685 mol. From stoichiometry: 4 mol Al → 2 mol Al₂O₃, so mol Al₂O₃ = 0.685/2 = 0.3425 mol. Molar mass Al₂O₃ = 102 g/mol: mass = 0.3425×102 = 34.94 g ≈ 34.9 g.

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Nursing QUESTION #9133

Question 2737

A nurse is calculating the expected date of delivery (EDD) using Naegele's rule. The patient's LMP was 10th September. What is the EDD?

17th June✔️
17th July
10th June
3rd July

Correct Answer Logic:

Naegele's Rule formula:

\[\text{EDD} = \text{LMP} - 3\,\text{months} + 7\,\text{days} + 1\,\text{year}\]

Or equivalently: Add 9 months and 7 days to LMP

Calculation:

LMP: 10th September
Subtract 3 months: 10th June
Add 7 days: 17th June
Add 1 year (next year)

Therefore, EDD = 17th June (next year)

Normal pregnancy duration: $280\,\text{days}$ or $40\,\text{weeks}$ from LMP $= 266\,\text{days}$ from conception.

Important caveat: Naegele's rule assumes a regular 28-day cycle with ovulation on Day 14. Adjust for irregular cycles accordingly. Ultrasound (especially first trimester CRL) is more accurate for dating.

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Dairy Food Science and Technology QUESTION #5874

Question 2738

The Methylene Blue Reduction Test (MBRT) estimates milk quality by measuring:

Somatic cell count
Fat content
Bacterial metabolic activity that decolorizes methylene blue✔️
Antibiotic residues

Correct Answer Logic:

MBRT is a reductase test. Bacterial enzymes reduce methylene blue (blue) to leucomethylene blue (colorless). Faster decolorization indicates higher bacterial load and poorer milk quality.

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Molecular Biology / Bioinformatics / Biochemistry QUESTION #11063

Question 2739

Terrestrial biodiversity is generally found to be greatest near the:

North pole
South pole
Equator✔️
Tropic of Cancer

Correct Answer Logic:

Terrestrial biodiversity peaks near the equator — a pattern known as the latitudinal diversity gradient. Tropical rainforests near the equator harbour over 50% of all terrestrial species despite covering only ~6% of Earth's land area. Multiple hypotheses explain this: higher solar energy input, stable warm temperatures year-round, higher precipitation, longer evolutionary history, and faster speciation rates. Biodiversity decreases progressively toward the poles.

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English Literature QUESTION #10740

Question 2740

What is the real (birth) name of the author George Orwell?

Eric Amber
Eric Blair✔️
Tom Scott
Winston Smith

Correct Answer Logic:

George Orwell's real name was Eric Arthur Blair (1903–1950). He adopted the pen name 'George Orwell' in 1933, reportedly choosing it to spare his family embarrassment when publishing Down and Out in Paris and London. 'Winston Smith' is the name of the protagonist in his dystopian novel Nineteen Eighty-Four (1949).

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