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Bio-Technology QUESTION #10601

The BOD (Biological Oxygen Demand) test measures:

The total chemical oxygen demand of all oxidisable substances in water
The oxygen consumed by microorganisms when oxidising organic matter in water over 5 days (BOD₅)✔️
The rate of photosynthesis by algae in a water sample
The oxygen transfer rate in a bioreactor

Correct Answer Logic:

BOD₅ measures the amount of dissolved oxygen (mg O₂/L) consumed by microorganisms when oxidising organic matter in a water sample at 20°C over 5 days in the dark. It is a standard indicator of organic pollution in wastewater. High BOD indicates high organic load, which depletes oxygen in receiving waters, causing fish kills. BOD differs from COD (chemical oxygen demand), which measures total oxidisable material by chemical oxidation.

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Ability / HR / Governance / Special Education QUESTION #1854

Question 10242

In Intelligence Bureau, who is the appointing authority for posts in BPS 1 to 16?

Director-General, Intelligence Bureau
Secretary Interior
PM Office
Officer(s) notified by the Director-General, Intelligence Bureau✔️

Correct Answer Logic:

Rule 6(2) Table entry 2(ii) specifies officer(s) notified by the Director-General, Intelligence Bureau as appointing authority for BPS 1-16 in IB.

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Home Economics QUESTION #6261

Question 10243

Which vitamin is known as the 'Sunshine Vitamin' and is essential for calcium absorption?

Vitamin A
Vitamin C
Vitamin D✔️
Vitamin K

Correct Answer Logic:

Vitamin D is synthesized by the body when skin is exposed to sunlight and is crucial for bone health.

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Chemistry QUESTION #7525

Question 10244

Which of the following statements about Henry's Law is incorrect?

Higher $K_H$ at a given pressure means higher solubility of the gas✔️
Different gases have different $K_H$ values at the same temperature
Partial pressure of the gas in vapour phase is proportional to its mole fraction in solution
$K_H$ increases with temperature and depends on the nature of the gas

Correct Answer Logic:

Henry's Law states: $p = K_H \cdot x$ (partial pressure = $K_H$ × mole fraction of gas in solution).

$K_H$ is the Henry's Law constant. A higher $K_H$ means that for the same mole fraction, the gas exerts higher pressure — meaning the gas is less soluble, not more soluble.

Statement A is incorrect: higher $K_H$ means lower solubility (gas is harder to dissolve).

Statements B, C, D are all correct properties of Henry's Law.

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General Knowledge QUESTION #8813

Question 10245

The first spacecraft to land on the Moon (July 16, 1969) was named?

Skylab
Apollo 7
Apollo 11✔️
Sputnik 5

Correct Answer Logic:

Apollo 11 made the first crewed lunar landing.

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Planning QUESTION #4956

Question 10246

In public health planning, what does 'morbidity rate' measure?

Death rate
Disease incidence rate✔️
Birth rate
Recovery rate

Correct Answer Logic:

Morbidity rate measures the incidence or prevalence of disease in a population, helping planners assess health service needs and identify public health priorities.

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Chemistry QUESTION #452

Question 10247

Magnesium reacts with hydrogen at high pressure in the presence of catalyst __________ forming magnesium hydride.

Dolomite
MgI?✔️
Mg?N?
Epsom salt

Correct Answer Logic:

MgI? catalyzes the reaction

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General Knowledge QUESTION #8685

Question 10248

What does 'nom de plume' mean?

Without leather
Anonymous (pen name)✔️
Both a and b
None of above

Correct Answer Logic:

Nom de plume is a writer's pseudonym.

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Boilers Mechanical Engineering QUESTION #2423

Question 10249

The Biot number (Bi) in transient heat conduction is defined as $Bi = hL_c/k$. It represents:

Convective resistance at surface divided by conductive resistance inside body
Internal conductive resistance to external convective resistance: $Bi = hL_c/k = \frac{L_c/(kA)}{1/(hA)}$✔️
Thermal diffusivity to kinematic viscosity
Inertial forces to viscous forces

Correct Answer Logic:

Biot number: $Bi=hL_c/k$, the ratio of internal conductive resistance $L_c/(kA)$ to external convective resistance $1/(hA)$. When $Bi\ll 0.1$, the lumped capacitance method is valid.

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Reading and Writing (Module-1) QUESTION #10407

Question 10250

The report's conclusions were ------- , supported by so much data that few could challenge them.

dubious
irrefutable✔️
speculative
contentious

Correct Answer Logic:

Conclusions 'few could challenge' are 'irrefutable.'

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Information Technology QUESTION #1130

Question 10251

What is the time complexity of searching for an element in a hash table?

O(1)✔️
O(n)
O(nlogn)
None of these

Correct Answer Logic:

In an ideal scenario (with a good hash function and minimal collisions), the average time complexity for searching in a hash table is constant time, O(1).

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CISA QUESTION #1751

Question 10252

Which of the following is NOT a purpose of the ISO 15489 records management standard?

Define minimum legal handling requirements for data records
Provide a legal standard of negligence and culpability
Eliminate the need for a detailed classification list for each data set✔️
Define governance responsibilities across the data life cycle

Correct Answer Logic:

ISO 15489 defines the minimum handling process for records of value and requires an information classification system — a list of each data set to be protected. It does not eliminate the need for such a list; rather, it mandates one as a core governance control.

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Accounting & Finance QUESTION #6204

Question 10253

In a 'Common-Size Balance Sheet', all accounts are expressed as a percentage of:

Total Sales
Net Income
Total Assets✔️
Total Liabilities

Correct Answer Logic:

Common-size balance sheets use Total Assets as the base ($100\%$) [cite: 31].

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Ability / HR / Governance / Special Education QUESTION #1872

Question 10254

Under Rule 18 & 19, for how long can an ad hoc appointment be made with prior FPSC clearance for posts within FPSC purview?

Three months or less
Six months or less✔️
One year or less
Two years or less

Correct Answer Logic:

Rule 19 states the appointing authority may fill a post on ad hoc basis for a period of six months or less after obtaining prior clearance of the Commission.

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English QUESTION #4448

Question 10255

We congratulate you ____ your achievement?

for
to
on✔️
at

Correct Answer Logic:

'Congratulate someone on something' is the standard idiomatic expression.

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MCQs Section QUESTION #4835

Question 10256

Select the word nearly opposite in meaning to "CAVIL"

Discern
Disclose
Introduce
Commend✔️

Correct Answer Logic:

Cavil means to make petty or unnecessary objections. Its antonym is 'commend,' which means to praise or express approval.

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Physics QUESTION #7005

Question 10257

A satellite orbits at height $h$ from Earth's surface where $h \ll R$ ($R$ = Earth's radius). The minimum increase in speed for the satellite to escape Earth's gravitational field is:

$\sqrt{2gR}$
$\sqrt{gR}$
$\sqrt{\dfrac{gR}{2}}$
$\sqrt{gR}\,(\sqrt{2}-1)$✔️

Correct Answer Logic:

For $h \ll R$, orbital radius $\approx R$:

Orbital speed: $v_o = \sqrt{gR}$

Escape speed from surface (approximately same radius): $v_e = \sqrt{2gR}$

Minimum increase: $\Delta v = v_e - v_o = \sqrt{2gR} - \sqrt{gR} = \sqrt{gR}(\sqrt{2}-1)$

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Electronics Engineering QUESTION #11709

Question 10258

In a PFC (Power Factor Correction) boost pre-regulator, the input current waveform is shaped to follow the input voltage. At rated load with $\text{PF} = 0.99$, what is the approximate THD of the input current?

~14%✔️
~5%
~1%
~40%

Correct Answer Logic:

The relationship between PF, displacement factor (DF), and THD is: $\text{PF} = \text{DF} \times \dfrac{1}{\sqrt{1+(\text{THD})^2}}$. For near-unity DF and PF = 0.99: $0.99 \approx \dfrac{1}{\sqrt{1+\text{THD}^2}}$, giving $\text{THD} \approx \sqrt{(1/0.99)^2 - 1} \approx \sqrt{0.0203} \approx 14\%$. Active PFC targets THD < 5% for high-quality designs.

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Logical Reasoning QUESTION #4433

Question 10259

One apple pie has $10$ slices, and each apple pie feeds five people. Henry is having a party with $200$ people. How many slices of pie does he need?

200
50
400✔️
100

Correct Answer Logic:

Each pie feeds $5$ people and has $10$ slices, so each person gets $\dfrac{10}{5} = 2$ slices. For $200$ people: total slices $= 200 \times 2 = 400$ slices.

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Islamic Studies QUESTION #8258

Question 10260

Who was Al Zahrawi, the Court Physician of?

Al Hakim II✔️
Haroon-ur-Rashid
Mamun-ur-Rashid
Al-Hakim IV

Correct Answer Logic:

Abu al-Qasim al-Zahrawi (Albucasis) was the court physician of Caliph Al-Hakam II of the Umayyad Caliphate in Cordoba, Spain. He lived from 936-1013 CE and is known as the 'father of modern surgery.' His 30-volume medical encyclopedia 'Al-Tasrif' contained detailed descriptions of surgical instruments and procedures that influenced European medicine for centuries.

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