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Chemistry QUESTION #7164

In the redox titration of oxalate ions with permanganate in an acidic medium, how many electrons are involved in the production of a single molecule of $CO_{2}$?

$5$
$2$
$10$
$1$✔️

Correct Answer Logic:

The half-reaction for oxalate is: $C_{2}O_{4}^{2-} \rightarrow 2CO_{2} + 2e^{-}$. In this process, 2 electrons are released for every two molecules of $CO_{2}$ produced. Therefore, for one molecule of $CO_{2}$, the number of electrons involved is $2/2 = 1$.

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Chemistry QUESTION #1002

Question 2

Statement (I): Nitrogen, sulphur, halogen and phosphorus present in an organic compound are detected by Lassaigne's Test. Statement (II): The elements present in the compound are converted from covalent form into ionic form by fusing the compound with Magnesium in Lassaigne's test.

Statement I is false but Statement II is true
Both Statement I and Statement II are true
Both Statement I and Statement II are false
Statement I is true but Statement II is false✔️

Correct Answer Logic:

Statement I is correct — N, S, halogens, and P are detected by Lassaigne's test. Statement II is false — the compound is fused with sodium (Na), not magnesium (Mg), to convert covalent bonds into ionic form (e.g., $\text{NaCN, Na}_2\text{S, NaX}$).

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General Knowledge QUESTION #4811

Question 3

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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Accounting & Finance QUESTION #6178

Question 4

A firm has an 'Average Collection Period' of 45 days and annual credit sales of $3.6 million. What is the approximate Accounts Receivable balance? (Use a 360-day year)

$300,000
$450,000✔️
$600,000
$800,000

Correct Answer Logic:

ACP = AR / (Sales/360). $45 = AR / (3.6M / 360) \rightarrow 45 = AR / 10,000 \rightarrow AR = 450,000$.

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Accounting & Finance QUESTION #6082

Question 5

A trader provided the following data:

Item	Jan 1 ($)	Dec 31 ($)
Bank (Debit)	4,240	6,320
Cash balance	264	271

During the year: Cheques issued were $19,950. All sales takings were banked except for $5,400 used for drawings and $7,200 for wages. Additionally, $3,000 was banked from the sale of a motor vehicle. Calculate total sales.

$22,037
$31,630
$31,637✔️
$34,637

Correct Answer Logic:

1. Cash banked from sales = Closing Bank ($6,320) + Cheques issued ($19,950) - Opening Bank ($4,240) - Sale of Asset ($3,000) = $19,030.
2. Total Sales = Banked Sales ($19,030) + Cash Drawings ($5,400) + Cash Wages ($7,200) + (Closing Cash $271 - Opening Cash $264) = $19,030 + $5,400 + $7,200 + $7 = $31,637.

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English QUESTION #8318

Question 6

Be _______ in your language.

Precise✔️
Meticulous
Punctilious
None of these

Correct Answer Logic:

'Precise' means exact and clear.

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Education QUESTION #6788

Question 7

A teacher uses a 'Guess Who' technique with her class. She describes positive behavioral characteristics and asks classmates to identify who fits the description. What type of assessment tool is this, and what specific aspect of student development can it NOT reliably measure?

Portfolio assessment; academic achievement
Peer appraisal using nomination method; it reliably measures most social traits but cannot directly measure academic content knowledge or cognitive skill levels✔️
Anecdotal record; physical development
Self-appraisal inventory; emotional development

Correct Answer Logic:

'Guess Who' is a technique within peer appraisal (sociometric/nomination approach). Peer appraisal is effective for assessing social relationships, acceptance, and behavioral/affective traits. However, it cannot substitute for formal cognitive assessment; peers are not equipped to reliably evaluate academic knowledge or complex thinking skills. These require direct measurement through tests or teacher observation.

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Medicinal Chemistry and Biopharmaceutics QUESTION #3819

Question 8

A patient is prescribed Lugol's Solution ($5\%$ iodine) $0.3$ mL three times daily. What is the total daily iodine dose?

$15$ mg
$30$ mg
$45$ mg✔️
$90$ mg

Correct Answer Logic:

$5\%$ iodine $= 5\ \text{g}/100\ \text{mL} = 50\ \text{mg/mL}$. Each dose $= 0.3 \times 50 = 15\ \text{mg}$. Three doses $= 15 \times 3 = 45\ \text{mg}$ per day.

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English QUESTION #507

Question 9

ASTOUNDED

Shocked✔️
Discarded
Assured
Attracted

Correct Answer Logic:

Astounded means greatly surprised or amazed

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The Elections Act 2017 QUESTION #9434

Question 10

Under Section 62(9)(c), a Returning Officer may reject a nomination paper if the candidate has submitted a declaration or statement which is false or incorrect 'in any material particular'. However, Section 62(10) provides an exception: a nomination paper shall NOT be rejected on the ground of default in payment of loans, taxes or government dues if:

The candidate has obtained a stay order from a court
The candidate deposits such amount of which he was unaware at the time of filing of his nomination paper✔️
The default is less than Rs. 100,000
The candidate provides a surety bond

Correct Answer Logic:

Section 62(10) states: 'where a candidate deposits any amount of loan, tax or government dues and utility expenses payable by him of which he is unaware at the time of filing of his nomination paper, such nomination paper shall not be rejected on the ground of default in payment of such loan, taxes or government dues and utility expenses.'

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Pakistan Affairs QUESTION #305

Question 11

Sindh river has been mentioned in:

Yajur Ved
Saam Ved
Rig Ved✔️
Arath Ved

Correct Answer Logic:

The Rigveda, the oldest of the Vedas, contains numerous references to the Sindhu (Indus) River.+1

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Egnlish QUESTION #721

Question 12

The setting of "1984" is a dystopian superstate called:

Eurasia
Eastasia
Oceania✔️
Utopia

Correct Answer Logic:

Oceania is the totalitarian regime governed by the Party and Big Brother.

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General Knowledge QUESTION #8674

Question 13

The Panama Canal connects which two oceans?

Atlantic and Indian
Indian and Pacific
Indian and Arabian Sea
Pacific and Atlantic✔️

Correct Answer Logic:

The Panama Canal connects the Pacific and Atlantic Oceans.

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Planning QUESTION #4989

Question 14

What does the 'Marchetti constant' suggest about urban form?

Cities should be circular
Average commute time remains stable at ~30 minutes✔️
Population density decreases exponentially
Building heights should be uniform

Correct Answer Logic:

Cesare Marchetti observed that throughout history, people budget approximately 30-60 minutes (average ~30) for one-way commuting, regardless of transportation mode. This constrains city size and influences urban sprawl patterns as speeds increase.

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Chemistry QUESTION #7362

Question 15

The correct set of four quantum numbers for the valence electron of rubidium ($Z = 37$) is:

5, 0, 0, +½✔️
5, 1, 0, +½
5, 1, 1, +½
6, 0, 0 +½

Correct Answer Logic:

Electronic configuration of Rb (Z=37):
[Kr] 5s¹

The valence electron is in the 5s subshell:

$n = 5$
$\ell = 0$ (s-subshell)
$m = 0$
$s = +\frac{1}{2}$

So the quantum numbers are (5, 0, 0, +½).

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Physics QUESTION #1161

Question 16

For the successful operation of a heat engine, which condition should be met?

Cyclic process
Operated at a certain temperature difference
Both (A) & (B)✔️
None of these

Correct Answer Logic:

A heat engine must: (1) operate in a cyclic process so that it can continuously perform work, and (2) operate between two temperature reservoirs (a hot source at $T_H$ and a cold sink at $T_C$) with $T_H > T_C$. Both conditions are essential as stated by the second law of thermodynamics.

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Boilers Mechanical Engineering QUESTION #4079

Question 17

'Emergency Shut Down' (ESD) button should be located:

Inside the furnace
At a safe, accessible distance from the boiler and in the control room✔️
Under the water tank
In the fuel tank

Correct Answer Logic:

Operators must be able to stop the process quickly in case of fire or rupture.

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Urdu QUESTION #1399

Question 18

مرزا غالب نے کس کے نام سب سے زیادہ خطوط لکھے؟

منشی ہرگوپال تفتہ✔️
میر مہدی مجروح
مرزا حاکم علی مہر
سب کو برابر لکھے

Correct Answer Logic:

مرزا غالب نے سب سے زیادہ خطوط اپنے شاگرد منشی ہرگوپال تفتہ کے نام لکھے۔ غالب کے خطوط اردو نثر میں ایک انقلابی قدم ہیں۔ انہوں نے خطوط نویسی کو سرکاری اور بناوٹی اسلوب سے آزاد کرا کر بول چال کی زبان میں لکھا۔ ان کے خطوط کا مجموعہ ''اردوئے معلٰی'' اردو ادب کا شاہکار ہے۔

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Mathematics QUESTION #7470

Question 19

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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Economics QUESTION #1680

Question 20

Among the four key assumptions underlying the model of perfect competition, which of the following is NOT one of them?

Free entry and exit of firms
Large number of small buyers and sellers
Perfect information among all market participants
Homogeneous (identical) product✔️

Correct Answer Logic:

Perfect competition assumes: (1) many small buyers and sellers, (2) homogeneous product, (3) free entry and exit, and (4) perfect information. All four options are actually standard assumptions of perfect competition — all apply. However, if the question is designed to test whether 'perfect information' is considered a basic assumption versus an advanced one, the intended answer in the FPSC key is (C) Perfect information, suggesting it is treated as a derived or secondary assumption. Standard economic theory includes it, but some simplified models omit it.

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