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Chemistry QUESTION #4356

Oxidation numbers of X, Y, Z are $+6$, $-2$, $\&$ $-1$ respectively. Possible molecular formula when atoms combine:

$X_2YZ$
$XY_2Z_2$✔️
$XYZ_2$
$XY_2Z$

Correct Answer Logic:

For electrical neutrality, the sum of oxidation numbers must equal zero. For $XY_2Z_2$: $(+6) + 2(-2) + 2(-1) = +6 - 4 - 2 = 0$ ✓. This is the correct formula.

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Ability / HR / Governance / Special Education QUESTION #1853

Question 2

In the Pakistan Audit Department, who is the appointing authority for posts in BPS 17 to 19?

Secretary Ministry of Finance
Comptroller General
Auditor-General of Pakistan✔️
Director General Audit

Correct Answer Logic:

Rule 6(2) Table entry 1(i) specifies the Auditor-General of Pakistan as appointing authority for BPS 17 to 19 in Pakistan Audit Department.

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Mathematics QUESTION #4129

Question 3

Find the Maclaurin series for $f(z) = z^2 e^{3z}$. What is the coefficient of $z^5$?

$\frac{9}{2}$✔️
$\frac{27}{40}$
$\frac{81}{40}$
$\frac{27}{8}$

Correct Answer Logic:

$e^{3z} = \sum_{n=0}^{\infty} \frac{(3z)^n}{n!} = \sum_{n=0}^{\infty} \frac{3^n z^n}{n!}$. So $z^2 e^{3z} = \sum_{n=0}^{\infty} \frac{3^n z^{n+2}}{n!}$. For $z^5$: $n + 2 = 5$, so $n = 3$. Coefficient: $\frac{3^3}{3!} = \frac{27}{6} = \frac{9}{2}$.

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General Knowledge QUESTION #4715

Question 4

Granting Most Favored Nation (MFN) status in trade implies which of the following?

Providing the same trade concessions given to all other partner nations without discrimination✔️
Trade conducted through commodity exchange rather than foreign exchange
Import and export payments made in local currencies only
Providing preferential tariff rates above standard rates

Correct Answer Logic:

MFN status means a country will receive the same trade treatment (tariffs, quotas, preferences) as the most favorably treated trading partner, ensuring non-discrimination in trade.

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Nursing QUESTION #9164

Question 5

A Charge Nurse using SWOT analysis for nursing unit planning — what does the 'T' in SWOT represent?

Teamwork
Targets
Threats✔️
Training

Correct Answer Logic:

SWOT Analysis is a strategic planning tool:

S — Strengths (internal positive factors)
W — Weaknesses (internal negative factors)
O — Opportunities (external positive factors)
T — Threats (external negative factors)

In nursing management, a Head Nurse uses SWOT analysis to assess the unit's capabilities, identify resource gaps, recognize opportunities for improvement, and anticipate external challenges such as budget cuts, staff shortages, or policy changes. This is frequently tested in Charge/Head Nurse examinations.

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Chemistry QUESTION #7371

Question 6

The energy (in joules) of light with wavelength 45 nm is: (Given: $h = 6.63 \times 10^{-34}$ Js, $c = 3 \times 10^8$ ms$^{-1}$)

$6.67 \times 10^{15}$ J
$6.67 \times 10^{11}$ J
$4.42 \times 10^{-15}$ J
$4.42 \times 10^{-18}$ J✔️

Correct Answer Logic:

Formula: $E = \dfrac{hc}{\lambda}$

$E = \dfrac{6.63 \times 10^{-34} \times 3 \times 10^8}{45 \times 10^{-9}}$
$= \dfrac{19.89 \times 10^{-26}}{45 \times 10^{-9}}$
$= \dfrac{19.89}{45} \times 10^{-17}$
$= 0.442 \times 10^{-17} = 4.42 \times 10^{-18}$ J

This energy (in UV range) is enough to ionise hydrogen from ground state ($13.6$ eV $= 2.18 \times 10^{-18}$ J).

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Home Economics QUESTION #6244

Question 7

Which style of parenting is characterized by high demands but low responsiveness?

Authoritative
Permissive
Uninvolved
Authoritarian✔️

Correct Answer Logic:

Authoritarian parents establish strict rules with little room for open dialogue or emotional support.

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CISA QUESTION #6840

Question 8

Define problem
Collect data
Analyze data
Draw conclusions

An organization's audit methodology skips directly from problem definition to conclusions without data collection or analysis. What is the PRIMARY consequence?

Faster audit completion
Conclusions lack evidentiary support and are essentially opinions rather than audit findings✔️
Reduced audit costs
Increased efficiency

Correct Answer Logic:

The scientific method and audit methodology require evidence-based conclusions. Skipping data collection and analysis means conclusions are based on assumptions or opinions rather than facts. This violates the fundamental audit principle that findings must be supported by sufficient, relevant, and reliable evidence.

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Administration QUESTION #9551

Question 9

A civil servant in Grade 19 applies for promotion to Grade 20. According to the Civil Servants Act 1973 and constitutional provisions, which appointing authority is responsible for appointments at Grade 20 and above?

Federal Public Service Commission through competitive examination
Prime Minister through the Cabinet Secretariat on the advice of the Establishment Division
The President of Pakistan✔️
The relevant Minister in consultation with the Secretary of the Ministry

Correct Answer Logic:

Article 240 of the Constitution and Civil Servants Act 1973 establish that appointments at Grade 20 and above are made by the President. This reflects the constitutional principle that senior civil service appointments carry national significance and require presidential authority.

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Pharmacokinetics and Pharmacodynamics QUESTION #3838

Question 10

Why is lignocaine (lidocaine) not suitable for oral systemic administration?

It is not absorbed from the gastrointestinal tract
It undergoes significant first-pass metabolism in the liver✔️
It is decomposed by gastric acid
It binds to mucoproteins in the intestine

Correct Answer Logic:

Lignocaine is well absorbed from the GI tract but undergoes very high first-pass hepatic metabolism ($>70\%$), reducing oral bioavailability to clinically ineffective levels.

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Reading and Writing (Module-1) QUESTION #5377

Question 11

While researching a topic, a student has taken the following notes: A lever is a simple machine consisting of a rigid beam and a fulcrum. The fulcrum is the point about which the beam pivots. In first-class levers, the fulcrum is located between the effort and the load. In second-class levers, the load is located between the effort and the fulcrum. The student wants to contrast first-class levers and second-class levers. Which choice most effectively uses relevant information from the notes to accomplish this goal?

In levers, the effort is the force applied to the lever; the load, in contrast, is the force that the lever exerts on another object.
In first-class and second-class levers, the fulcrum and the load are in different locations.
First-class levers are simple machines consisting of a rigid beam and a fulcrum, but then again, the same is true of second-class levers.
In first-class levers, the fulcrum is located between the effort and the load, but in second-class levers, the load is located between the effort and the fulcrum.✔️

Correct Answer Logic:

Option D clearly states the physical difference between the two types of levers, providing a complete contrast.

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Chemistry QUESTION #1108

Question 12

Match List I (Ion) with List II (Group in Cation Analysis): A. Co$^{2+}$ B. Mg$^{2+}$ C. Pb$^{2+}$ D. Al$^{3+}$; with I. Group-I II. Group-III III. Group-IV IV. Group-VI

A-III, B-II, C-IV, D-I
A-III, B-II, C-I, D-IV
A-III, B-IV, C-II, D-I
A-III, B-IV, C-I, D-II✔️

Correct Answer Logic:

In qualitative analysis: Pb$^{2+}$ → Group I (precipitates as PbCl$_2$ with HCl) but also appears partially in Group II. Co$^{2+}$ → Group III (precipitates as CoS in NH$_4$OH/H$_2$S). Al$^{3+}$ → Group III (Al(OH)$_3$ precipitate). Mg$^{2+}$ → Group VI (last group, Mg(OH)$_2$ with NaOH). Pb$^{2+}$ in Group IV (PbS with H$_2$S in dilute HCl). Matching: A-III, B-IV (Mg=Group VI? or IV), C-I (Pb=Group I), D-III... Revised: A(Co$^{2+}$)=III, B(Mg$^{2+}$)=IV (Group IV uses (NH$_4$)$_2$CO$_3$: no, Mg is Group V or VI). Standard: A-III, B-IV, C-I, D-II — option (4).

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Mathematics QUESTION #4157

Question 13

For the Fourier series of an even function $f(x)$ on $[-L, L]$, which coefficients are zero?

All $a_n$
All $b_n$✔️
All $a_n$ and $b_n$
None

Correct Answer Logic:

For even functions, $f(-x) = f(x)$, so $b_n = \frac{1}{L}\int_{-L}^{L} f(x)\sin(\frac{n\pi x}{L})dx = 0$ since integrand is odd. Only cosine terms ($a_n$) remain.

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Islamic Studies QUESTION #7883

Question 14

When was the first "Wahi" (revelation) revealed to the Holy Prophet Muhammad (PBUH)?

570 AD
610 AD✔️
630 AD
590 AD

Correct Answer Logic:

The first revelation (Wahi) was revealed to Prophet Muhammad (PBUH) in 610 AD when he was 40 years old in the Cave of Hira during the month of Ramadan. Angel Jibreel (Gabriel) appeared and revealed the first verses of Surah Al-Alaq: "Read in the name of your Lord who created."

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Physics QUESTION #7034

Question 15

A student records the length of a rod as $3.50 \text{ cm}$. Identify the instrument used for this measurement based on its precision.

A screw gauge with a pitch of $1 \text{ mm}$ and $100$ circular scale divisions
A screw gauge with a pitch of $1 \text{ mm}$ and $50$ circular scale divisions
A standard metre scale
A vernier calliper where $10$ divisions of the vernier scale coincide with $9$ main scale divisions (main scale has $10 \text{ divisions per cm}$)✔️

Correct Answer Logic:

The recorded value $3.50 \text{ cm}$ has a precision of $0.01 \text{ cm}$. We must find an instrument with a least count (LC) of $0.01 \text{ cm}$.

Option A: $LC = \frac{1 \text{ mm}}{100} = 0.01 \text{ mm} = 0.001 \text{ cm}$
Option B: $LC = \frac{1 \text{ mm}}{50} = 0.02 \text{ mm} = 0.002 \text{ cm}$
Option C: $LC = 0.1 \text{ cm}$
Option D: $1 \text{ MSD} = \frac{1 \text{ cm}}{10} = 0.1 \text{ cm}$. Since $10 \text{ VSD} = 9 \text{ MSD}$, $1 \text{ VSD} = 0.9 \text{ MSD}$. $LC = 1 \text{ MSD} - 1 \text{ VSD} = 0.1 \text{ MSD} = 0.01 \text{ cm}$.

Thus, Option D matches the required precision.

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Agronomy QUESTION #2047

Question 16

The Economic Threshold Level (ETL) in crop pest management is defined as:

The pest density at which the crop begins to show visible damage symptoms
The pest population density at which control measures must be initiated to prevent the pest from reaching the Economic Injury Level (EIL) — accounting for the time needed for control measures to take effect✔️
The maximum pest density a crop can tolerate without any yield loss
The point at which 50% of the crop stand is destroyed by the pest

Correct Answer Logic:

ETL (action threshold) is always set BELOW the Economic Injury Level (EIL) — the pest density at which economic damage equals cost of control. The ETL triggers action while the pest population is still rising, allowing time for control measures to prevent the EIL from being reached. ETL < EIL is a fundamental IPM concept.

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General Science and Ability QUESTION #249

Question 17

If the radius of a circle is increased three times then its area is increased:

Three times
Six times
Nine times✔️
None of these

Correct Answer Logic:

Area A=πr2. If r becomes 3r, then A becomes π(3r)2=9πr2.

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Mathematics QUESTION #1329

Question 18

The wave equation $u_{xx}=\dfrac{1}{c^2}u_{tt}$ describes waves that travel at speed:

1
$c$✔️
$c^2$
$\dfrac{1}{c}$

Correct Answer Logic:

The wave equation $u_{xx}=\dfrac{1}{c^2}u_{tt}$ has solutions of the form $f(x\pm ct)$, representing waves propagating in the $\pm x$ direction with speed $c$. The constant $c$ is the wave speed (e.g., for a string, $c=\sqrt{T/\mu}$).

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Mathematics QUESTION #1263

Question 19

Using the epsilon-delta definition, $\lim_{x\to 2}\dfrac{x^3-4}{x^2+1}$ equals:

$\dfrac{2}{5}$
$\dfrac{4}{5}$✔️
$\dfrac{8}{5}$
$1$

Correct Answer Logic:

Direct substitution: $\dfrac{(2)^3-4}{(2)^2+1}=\dfrac{8-4}{4+1}=\dfrac{4}{5}$. The function is continuous at $x=2$, so the limit equals the function value.

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Paper-I (Anatomy/Physiology and Biochemistry/Microbiology) QUESTION #3321

Question 20

'Hemolysis' on a Blood Agar plate appearing as a CLEAR zone around a colony is:

Alpha-hemolysis
Beta-hemolysis✔️
Gamma-hemolysis
No hemolysis

Correct Answer Logic:

Beta-hemolysis indicates complete destruction of red blood cells.

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