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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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Ability / HR / Governance / Special Education QUESTION #1865

Question 1602

Once a date of birth is recorded at the time of joining government service, can it be altered later?

Yes, with FPSC approval
Yes, with Establishment Division approval
No, it is final and no alteration is permissible✔️
Yes, once within first five years

Correct Answer Logic:

Rule 12-A states the date of birth once recorded at the time of joining government service shall be final and thereafter no alteration shall be permissible.

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Quantitative Reasoning QUESTION #8014

Question 1603

Choose the word that is most nearly opposite in meaning to FALLACY

personal philosophy
imaginative idea
unconfirmed theory
valid argument✔️

Correct Answer Logic:

FALLACY means a false or mistaken belief, or flawed reasoning. The opposite would be sound, correct reasoning. Valid argument is the correct opposite: a fallacy is faulty reasoning, while a valid argument is sound, logical reasoning based on truth.

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Planning QUESTION #5024

Question 1604

In social impact assessment, what is the 'displacement effect'?

Physical relocation of residents✔️
Psychological impact of change
Economic loss
Environmental degradation

Correct Answer Logic:

Displacement (direct or indirect/economic) involves forced relocation of residents due to development projects. Direct displacement is physical removal; economic displacement occurs when rising costs force residents out. Both have severe social impacts requiring mitigation measures and resettlement assistance.

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Mathematics QUESTION #7470

Question 1605

If $0 \leq x < \frac{\pi}{2}$, then the number of values of x for which $\sin x - \sin 2x + \sin 3x = 0$, is:

3
1
4
2✔️

Correct Answer Logic:

Using sum-to-product: $(\sin x + \sin 3x) - \sin 2x = 0$, which gives $2\sin 2x \cos x - \sin 2x = 0$, or $\sin 2x(2\cos x - 1) = 0$. Either $\sin 2x = 0$ or $\cos x = \frac{1}{2}$. For $\sin 2x = 0$: $2x = 0, \pi, 2\pi, \ldots$, giving $x = 0$ (boundary, included) or $x = \frac{\pi}{2}$ (boundary, excluded). So one solution $x=0$. For $\cos x = \frac{1}{2}$: $x = \frac{\pi}{3}$ in the given range. Total solutions = 2.

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Accounting & Finance QUESTION #1194

Question 1606

The purpose of reversing entries is:

To correct errors in the trial balance
To simplify recording certain transactions in the next period✔️
To adjust financial statements
To close permanent accounts

Correct Answer Logic:

Reversing entries are optional entries made at the beginning of the new accounting period to reverse certain adjusting entries (typically accruals). Their purpose is to simplify the recording of related transactions in the next period — for example, reversing an accrued salary entry so the next payroll can be recorded normally without splitting amounts.

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English QUESTION #2696

Question 1607

Identify the correctly punctuated sentence:

It's a beautiful day.✔️
Its a beautiful day.
Its' a beautiful day.
It is' a beautiful day.

Correct Answer Logic:

'It's' is the contraction for 'It is'.

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Library Sciences QUESTION #1566

Question 1608

An Integrated Library System (ILS) typically includes which set of core functional modules?

Acquisitions, Cataloguing, Circulation, Serials Management, and OPAC✔️
Acquisitions, Binding, Photocopying, Printing, and Accounting
Cataloguing, Housekeeping, Archiving, Scanning, and Emailing
Circulation, Website Design, Social Media, Budgeting, and Staffing

Correct Answer Logic:

A standard ILS integrates core library functions into a unified system: Acquisitions (ordering and receiving), Cataloguing (bibliographic records), Circulation (loans and returns), Serials Management (periodicals), and an OPAC (Online Public Access Catalogue) for user searching.

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Ability / HR / Governance / Special Education QUESTION #1868

Question 1609

Under Rule 14, vacancies in posts in BPS 3 to 15 in offices serving the whole of Pakistan shall be filled on what basis?

Local basis
Provincial basis
All-Pakistan basis with merit and provincial/regional quotas✔️
Regional basis only

Correct Answer Logic:

Rule 14(ii) states vacancies in BPS 3 to 15 in offices which serve the whole of Pakistan shall be filled on All-Pakistan basis in accordance with merit and provincial or regional quotas.

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Reading and Writing (Module-1) QUESTION #5346

Question 1610

This excerpt is from Elizabeth von Arnim's 1922 novel, The Enchanted April. The characters Mrs. Wilkins and Rose are on a trip to Italy. 'I'm going to have one of these gorgeous oranges,' said Mrs. Wilkins, staying where she was and reaching across to a black bowl piled with them. 'Rose, how can you resist them. Look—have this one. Do have this beauty—' And she held out a big one. As used in the text, what does the phrase 'reaching across to' most nearly mean?

Joining with
Gaining on
Stretching toward✔️
Arriving at

Correct Answer Logic:

In this context, 'reaching across' describes the physical action of extending one's arm toward an object, making 'stretching toward' the best fit.

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English QUESTION #488

Question 1611

He proved that if only germs were excluded of wounds, inflammation was averted.

that if✔️
germs were
excluded of wounds
inflammation was

Correct Answer Logic:

Error: 'that if' should be restructured

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Tourism & Hospitality Management QUESTION #1599

Question 1612

The Cultural Tourism course distinguishes between 'tangible' and 'intangible' cultural heritage. Which of the following correctly pairs each type with an example from the Pakistan context?

Tangible: Folk music and dance; Intangible: Mohenjo-daro ruins
Tangible: Archaeological sites and architecture; Intangible: Folklores, performing arts, and traditional sports✔️
Tangible: National museums; Intangible: Government tourism policy
Tangible: Fairs and festivals; Intangible: Ancient coins and artifacts

Correct Answer Logic:

The Cultural Tourism course explicitly distinguishes tangible heritage (archaeological sites, museums, architecture, arts & crafts) from intangible heritage (folklores, performing arts, music, drama, dance, traditional sports, food & gastronomy). This distinction is critical to heritage management and UNESCO frameworks.

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English QUESTION #2761

Question 1613

Which sentence uses the SEMICOLON correctly?

She was tired; but she kept working.
She was tired; she kept working.✔️
She was tired; and she kept working.
She was tired; to keep working.

Correct Answer Logic:

A semicolon is used to join two independent (complete) clauses without a conjunction. 'She was tired; she kept working' correctly joins two complete sentences. A semicolon should not be used before conjunctions like 'but' or 'and'.

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Chemistry QUESTION #1417

Question 1614

Langmuir isotherm assumes:

Multilayer adsorption
Uniform surface without interactions between adsorbed molecules✔️
Gas behaves as ideal
None of these

Correct Answer Logic:

The Langmuir adsorption isotherm is based on key assumptions: (1) monolayer adsorption only, (2) the surface is uniform with equivalent adsorption sites, (3) there are no interactions between adsorbed molecules, and (4) each site can hold only one adsorbate molecule. Multilayer adsorption is described by the BET isotherm, not Langmuir.

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Physics QUESTION #5586

Question 1615

A room is supplied with electricity at 120 V. The lead wires have a total resistance of $6\,\Omega$. A 60 W bulb is already running. What is the decrease in voltage across the bulb when a 240 W heater is switched on in parallel with the bulb?

Zero Volt
2.9 Volt
13.3 Volt
10.04 Volt✔️

Correct Answer Logic:

Resistance of the bulb: $R_b = \frac{V^2}{P} = \frac{(120)^2}{60} = 240\,\Omega$

Before heater is switched on: Current $= \frac{120}{240+6} = \frac{120}{246}\,\text{A}$. Voltage across bulb $= \frac{120 \times 240}{246} \approx 116.9\,\text{V}$.

Resistance of heater: $R_h = \frac{(120)^2}{240} = 60\,\Omega$. Parallel combination: $R_p = \frac{240 \times 60}{300} = 48\,\Omega$.

After heater is switched on: Voltage across combination $= \frac{120 \times 48}{48+6} = \frac{5760}{54} \approx 106.67\,\text{V}$.

Decrease $= 116.9 - 106.67 \approx 10.04\,\text{V}$. Answer: D.

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Paper-I (Anatomy/Physiology and Biochemistry/Microbiology) QUESTION #3149

Question 1616

The 'Sclera' is the:

Colored part of the eye
White, outer layer of the eye✔️
Clear window of the eye
Back of the eye

Correct Answer Logic:

The sclera provides structure and protection.

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Quantitative Reasoning QUESTION #8121

Question 1617

In the context of the passage about Nahuatl language, the word coinages most nearly means:

adaptations
creations✔️
idiosyncrasies
currencies

Correct Answer Logic:

In the passage, coinages refers to linguistic expressions invented by the Toltec people — original language forms they created. Creations is the best fit because it captures the idea of newly invented expressions or terms. 'Adaptations' implies modifying something existing. 'Idiosyncrasies' means personal quirks. 'Currencies' is the literal financial meaning, which doesn't apply in a linguistic context.

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Chemistry QUESTION #5545

Question 1618

In which of the following pairs of molecules/ions are BOTH species unlikely to exist?

$H_2^+,\ He_2^{2-}$
$H_2^-,\ He_2^{2-}$
$H_2^{2+},\ He_2$✔️
$H_2^-,\ He_2^{2+}$

Correct Answer Logic:

Bond order = $\frac{1}{2}(\text{bonding} - \text{antibonding electrons})$. $H_2^{2+}$: 0 electrons, BO = 0 → does not exist. $He_2$: 2 bonding + 2 antibonding, BO = 0 → does not exist. Therefore both $H_2^{2+}$ and $He_2$ cannot exist, making option C correct.

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Verbal Reasoning QUESTION #8177

Question 1619

Let $n$ be a positive integer divisible by 6. Compare:

Quantity A: The remainder when $n$ is divided by 12

Quantity B: The remainder when $n$ is divided by 18

Quantity A is greater
Quantity B is greater
The two quantities are equal
The relationship cannot be determined from the information given✔️

Correct Answer Logic:

Since $n$ is divisible by 6, $n$ can be $6, 12, 18, 24, 30, 36, \ldots$

Example 1: $n = 12$. Remainder ÷12 $= 0$. Remainder ÷18 $= 12$. B > A.

Example 2: $n = 18$. Remainder ÷12 $= 6$. Remainder ÷18 $= 0$. A > B.

Example 3: $n = 36$. Remainder ÷12 $= 0$. Remainder ÷18 $= 0$. Equal.

The relationship changes, so it cannot be determined.

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Biology Zoology Botany QUESTION #1365

Question 1620

A cross between an individual with an unknown genotype and a homozygous recessive individual is called a:

Back cross
Test cross✔️
Monohybrid cross
Dihybrid cross

Correct Answer Logic:

A test cross involves crossing an organism with an unknown genotype (possibly homozygous dominant or heterozygous) with a homozygous recessive individual (e.g., aa). The phenotypic ratio of offspring reveals the unknown genotype. If all offspring show the dominant phenotype, the unknown parent is homozygous dominant; if a 1:1 ratio appears, it is heterozygous.

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