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Math Physics Chemistry Biology QUESTION #4313

Which of the following is the correct sequence of cellular molecules from highest to lowest amount in the cell?

DNA $>$ rRNA $>$ tRNA $>$ mRNA✔️
rRNA $>$ tRNA $>$ mRNA $>$ DNA
mRNA $>$ tRNA $>$ rRNA $>$ DNA
DNA $>$ mRNA $>$ tRNA $>$ rRNA

Correct Answer Logic:

In a cell: DNA exists as 2 copies (diploid), rRNA is the most abundant RNA (~80%), tRNA is next (~15%), and mRNA is least (~5%). Correct order: DNA $>$ rRNA $>$ tRNA $>$ mRNA.

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English QUESTION #8558

Question 3882

What does PAC stand for?

Pakistan Atomic Council
Public Accounts Committee✔️
Punjab Agriculture Corporation
Public Audit Code

Correct Answer Logic:

PAC commonly stands for Public Accounts Committee.

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Math Physics Chemistry Biology QUESTION #4223

Question 3883

Which competitive inhibitor blocks the enzyme responsible for bacterial cell wall synthesis?

Sulphonamide
Streptomycin
Tetracycline
Penicillin✔️

Correct Answer Logic:

Penicillin inhibits cell wall synthesis enzymes.

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Boilers Mechanical Engineering QUESTION #3979

Question 3884

In a 'Fire Tube' boiler, which of the following is true regarding the heat exchange process?

Water circulates inside the tubes, surrounded by hot gases
Hot gases pass through the tubes, surrounded by water✔️
The boiler is only used for very high pressure ($>100~bar$)
There are no tubes used in the design

Correct Answer Logic:

Fire-tube boilers like the Lancashire or Locomotive types have hot gases inside tubes to heat the surrounding water.

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Paper-I (Pharmaceutics II (Industrial and Quality Control) and Pharmaceutics III (Hospital and Community Pharmacy)) QUESTION #5696

Question 3885

In the formula $V_{1}C_{1} = V_{2}C_{2}$, if we dilute $50 \text{ mL}$ of $95\% \text{ v/v}$ Alcohol to $70\% \text{ v/v}$, what is the final volume $V_{2}$?

$36.8 \text{ mL}$
$135.7 \text{ mL}$
$67.8 \text{ mL}$✔️
$50.0 \text{ mL}$

Correct Answer Logic:

Calculation: $50 \times 95 = V_{2} \times 70 \Rightarrow V_{2} = 4750/70 \approx 67.8 \text{ mL}$.

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General Knowledge QUESTION #7718

Question 3886

The Abbasid Governor _____ came to Sindh in 140 AH / 757 AD.

Hisham✔️
Walid
Musa
None of these

Correct Answer Logic:

Hisham ibn Amr al-Taghlibi was appointed as the Abbasid governor of Sindh around 140 AH (757 AD). The Abbasid period saw administrative changes in Sindh following the earlier Umayyad conquest of the region.

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Biology Zoology Botany QUESTION #1350

Question 3887

Which of the following statements is TRUE about animal behavior?

Animals will derive their current behavior from past experiences✔️
Two animals of the same species will have exactly identical behavior
Animals will behave in the same manner with all human beings
None of these

Correct Answer Logic:

Animal behavior is shaped by both genetics (innate) and experience (learned). Animals can learn from past experiences through conditioning, habituation, imprinting, and trial-and-error, which modifies their current behavior. Two animals of the same species do NOT have identical behavior due to individual variation and different experiences. Behavior also varies with context.

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Sociology QUESTION #1659

Question 3888

Which sociological process describes the mechanism through which individuals internalize the norms, values, and behavioral expectations of the society they are born into?

Assimilation
Amalgamation
Socialization✔️
Institutionalization

Correct Answer Logic:

Socialization is the lifelong process by which individuals learn and internalize the cultural norms, values, roles, and behaviors expected of them in their society. It is distinct from assimilation (merging into a dominant culture) and institutionalization (embedding practices into formal structures).

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Paper-I (Anatomy/Physiology and Biochemistry/Microbiology) QUESTION #3324

Question 3889

'Pandemic' refers to an infectious disease that:

Is always present in a population
Occurs occasionally
Spreads across multiple countries or continents✔️
Affects only animals

Correct Answer Logic:

An Epidemic is local; a Pandemic is global.

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Math Physics Chemistry Biology QUESTION #4294

Question 3890

The secondary structure of proteins is stabilized by:

Ionic bonds
Hydrogen bonds✔️
Disulfide bridges
Hydrophobic exclusion

Correct Answer Logic:

The secondary structure of proteins ($\alpha$-helix and $\beta$-pleated sheet) is maintained by hydrogen bonds between the carbonyl ($C=O$) and amino ($N-H$) groups of the peptide backbone.

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Dairy Food Science and Technology QUESTION #5894

Question 3891

Which correctly describes the order of operations in a typical HTST pasteurization system?

Raw milk $\rightarrow$ pasteurizer $\rightarrow$ regeneration $\rightarrow$ holding tube $\rightarrow$ cooling $\rightarrow$ packaging
Raw milk $\rightarrow$ regeneration (heating) $\rightarrow$ pasteurizer $\rightarrow$ holding tube $\rightarrow$ cooling $\rightarrow$ packaging
Raw milk $\rightarrow$ filter $\rightarrow$ regeneration (heating) $\rightarrow$ holding tube $\rightarrow$ regeneration (cooling) $\rightarrow$ chiller $\rightarrow$ packaging✔️
Raw milk $\rightarrow$ homogenizer $\rightarrow$ holding tube $\rightarrow$ regeneration $\rightarrow$ pasteurization $\rightarrow$ packaging

Correct Answer Logic:

In HTST pasteurization: raw cold milk enters the regeneration section (heated by outgoing hot pasteurized milk to $\approx 57\text{–}65^{\circ}\text{C}$, saving $\approx 75\%$ energy), then enters the heating section (to $\geq 72^{\circ}\text{C}$), passes through the holding tube ($\geq 15$ seconds), returns through regeneration (cooling) and a chiller before packaging.

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Pakistan Affairs QUESTION #9109

Question 3892

Who wrote the book 'Towards New Pakistan'?

Zahid Ahmed
Munir A. Khan
Dr. A.Q. Khan
Muhammad Ayub Khan✔️

Correct Answer Logic:

Field Marshal Ayub Khan wrote 'Towards New Pakistan'.

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Tourism & Hospitality Management QUESTION #1605

Question 3893

The Housekeeping Operations course covers 'green housekeeping' as a contemporary practice. Which of the following best describes its primary objective?

Painting hotel rooms in green colors to improve aesthetics
Implementing environmentally responsible cleaning practices that minimize chemical use, water consumption, waste, and energy in housekeeping operations✔️
Hiring staff from rural green areas to ensure cultural diversity
Managing the hotel's outdoor garden and landscaping

Correct Answer Logic:

Green housekeeping, covered in Module 3 of the Housekeeping Operations course under 'Cleaning Procedures,' refers to adopting eco-friendly, sustainable practices in housekeeping — including the use of biodegradable cleaning agents, reduced water and energy consumption, and waste minimization — aligned with broader sustainability goals in hotel operations.

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Pakistan Affairs QUESTION #594

Question 3894

In his educational endeavours Abdul Ghaffar Khan was inspired by:

Mahatma Gandhi
Haji Sahib of Turangzai✔️
Allama Muhmmad Iqbal
None of These

Correct Answer Logic:

He was deeply influenced by the religious and social reformer Haji Sahib of Turangzai.

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Chemistry QUESTION #7187

Question 3895

In an acidic environment, hydrogen peroxide acts as an oxidant to convert $[Fe(CN)_{6}]^{4-}$ into $[Fe(CN)_{6}]^{3-}$. Conversely, in an alkaline medium, it reduces $[Fe(CN)_{6}]^{3-}$ back to $[Fe(CN)_{6}]^{4-}$. Identify the additional products generated in these two respective processes.

$H_{2}O$ and $(H_{2}O+O_{2})$✔️
$H_{2}O$ and $(H_{2}O+OH^{-})$
$(H_{2}O+O_{2})$ and $H_{2}O$
$(H_{2}O+O_{2})$ and $(H_{2}O+OH^{-})$

Correct Answer Logic:

The reactions are as follows:

Acidic Medium: $2[Fe(CN)_{6}]^{4-} + H_{2}O_{2} + 2H^{+} \rightarrow 2[Fe(CN)_{6}]^{3-} + 2H_{2}O$. Here, $H_{2}O_{2}$ is reduced to $H_{2}O$.
Alkaline Medium: $2[Fe(CN)_{6}]^{3-} + H_{2}O_{2} + 2OH^{-} \rightarrow 2[Fe(CN)_{6}]^{4-} + 2H_{2}O + O_{2}$. Here, $H_{2}O_{2}$ is oxidized to $O_{2}$.

Thus, the products are $H_{2}O$ and $(H_{2}O + O_{2})$.

[cite: 13]

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Biology QUESTION #7241

Question 3896

The bacterium Clostridium botulinum that causes botulism is:

A facultative aerobe
An obligate aerobe
A facultative anaerobe
An obligate anaerobe✔️

Correct Answer Logic:

Clostridium botulinum is an obligate anaerobe — it can survive and grow only in the absence of oxygen. Oxygen is toxic to it. This is why botulism is associated with improperly sealed (anaerobic) canned foods where the bacterium produces its deadly neurotoxin.

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Boilers Mechanical Engineering QUESTION #4022

Question 3897

'Induced Draft' fans are located:

Before the furnace
At the base of the chimney (after the boiler)✔️
Inside the drum
In the fuel tank

Correct Answer Logic:

They 'pull' the flue gases out of the boiler, creating a slightly negative pressure in the furnace.

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Paper-I (Anatomy/Physiology and Biochemistry/Microbiology) QUESTION #3570

Question 3898

'Phytochemistry' is the study of:

Plant classification
Plant chemicals (phytochemicals)✔️
Plant growth
Soil

Correct Answer Logic:

It focuses on the extraction and identification of plant constituents.

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Geography QUESTION #6339

Question 3899

The concept of 'carrying capacity' applied to tourism destinations refers to:

Maximum number of tourists that can be accommodated in hotels
Maximum number of visitors a site can sustain without unacceptable environmental or social impacts✔️
Peak season tourist arrivals
Economic threshold for tourism profitability

Correct Answer Logic:

Tourism carrying capacity is the maximum number of visitors a destination can sustain without causing unacceptable deterioration of physical environment, degradation of visitor experience, or adverse impacts on local community.

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General Knowledge QUESTION #8274

Question 3900

Which component of a computer system is often referred to as its 'brain'?

ALU (Arithmetic Logic Unit)
Memory
CPU (Central Processing Unit)✔️
Control unit

Correct Answer Logic:

The CPU processes instructions and is considered the brain of the computer.

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