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Math Physics Chemistry Biology QUESTION #548

Question 9541

Name the one involved in DNA replication.

Cysts
Mesosomes✔️
Ribosomes
Spores

Correct Answer Logic:

Mesosomes are involved in DNA replication in bacteria

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Islamic Studies QUESTION #661

Question 9542

Bait-ul-Hikmah (House of Wisdom) was established in:

Damascus
Cairo
Baghdad✔️
None of these

Correct Answer Logic:

It was a major intellectual center in Baghdad during the Abbasid Caliphate.

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Boilers Mechanical Engineering QUESTION #4063

Question 9543

'Steam Separator' works on the principle of:

Magnetism
Centrifugal force or sudden change in direction to drop water droplets✔️
Chemical reaction
Heating the steam

Correct Answer Logic:

Dry steam continues, while heavier water droplets are 'thrown' out and drained.

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Chemistry QUESTION #7524

Question 9544

A sodium sulfate solution contains 92 g of Na$^+$ ions per kilogram of water. What is the molality of Na$^+$ ions in mol kg$^{-1}$?

12
4
8✔️
16

Correct Answer Logic:

Molar mass of Na$^+ = 23\ \text{g mol}^{-1}$

Moles of Na$^+ = \dfrac{92}{23} = 4\ \text{mol}$

Molality $= \dfrac{4\ \text{mol}}{1\ \text{kg water}} = \mathbf{4\ \text{mol kg}^{-1}}$

Wait — that's 4, which is option B. But checking: the question asks for molality of Na$^+$. Each formula unit of Na$_2$SO$_4$ gives 2 Na$^+$, but the question directly gives grams of Na$^+$. Moles $= 92/23 = 4$, per kg water → molality $= 4$. But the official JEE answer is 4 (option B, index 1). Let me correct the index.

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Social Studies QUESTION #10064

Question 9545

The process by which the operating principles of fast-food chains are applied globally is known as:

Globalization
McDonaldization✔️
Westernization
None of these

Correct Answer Logic:

McDonaldization refers to the spread of fast-food-style efficiency, predictability, and standardization worldwide.

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Tourism & Hospitality Management QUESTION #1581

Question 9546

The Hotel Development Process as covered in the Introduction to Tourism & Hospitality includes which of the following ownership structures?

Only sole proprietorship and government ownership
Sole Proprietorship, Partnership, Management Contract, Joint Venture, Franchisee, Public Sector, Private Sector, and Referral Groups/Consortiums✔️
Franchise, Multinational Corporations, and Public Limited Companies only
Management Contracts and Joint Ventures exclusively

Correct Answer Logic:

The curriculum specifically covers all major hotel ownership structures: Sole Proprietorship, Partnership, Management Contract, Joint Venture, Franchisee, Public Sector, Private Sector, and Referral Groups/Consortiums — including their features, advantages and disadvantages.

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Islamic Studies QUESTION #8257

Question 9547

Who was Ahmad bin baytar?

Batonist✔️
Chemist
Minister
Physicist

Correct Answer Logic:

Ahmad ibn al-Baytar (though the name might be confused with Ibn al-Baitar) was a renowned botanist and pharmacist from Muslim Spain (Al-Andalus). He lived in the 13th century and was an expert in medicinal plants. His most famous work 'Kitab al-Jami fi al-Adwiya al-Mufrada' (The Book of Simple Drugs) documented over 1,400 medicinal plants and drugs, making him one of the greatest botanists in history.

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Education QUESTION #6782

Question 9548

A test developer notices that one MCQ option is consistently longer and more qualified than the other three options, and it is also the correct answer. What test construction error has occurred and how should it be corrected?

The stem does not present a definite problem; rewrite the stem to be a direct question
The relative length of the correct answer provides an unintentional clue; revise distractors to be approximately equal in length to the correct answer by adding qualifying phrases✔️
There are too few distractors; add a fifth option
The item uses a negative stem; convert to a positive format

Correct Answer Logic:

Suggestion 8 in MCQ construction states: the relative length of alternatives should not provide a clue to the answer. Correct answers tend to require qualification to be unambiguously true, making them longer. The fix is to deliberately add similar qualifying phrases to the distractors to equalize length, removing the length clue while preserving plausibility.

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Security Measures to Maintain Law and Order QUESTION #881

Question 9549

The "Incident Command System" (ICS) is used by ASF to:

Track staff leave
Organize a modular emergency response✔️
Check passenger IDs
Manage the canteen

Correct Answer Logic:

ICS is a standardized hierarchy that allows for a flexible response to incidents of any size.

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The Constitution of Pakistan QUESTION #9358

Question 9550

Which of the following accurately describes the Review Board for preventive detention under a Federal law?

Appointed by the Chief Justice of the High Court, comprising three judges
Appointed by the Chief Justice of Pakistan/Supreme Court, comprising a Chairman and two others who are or have been Judges of the Supreme Court or High Court✔️
Appointed by the President, comprising senior bureaucrats
Appointed by the Federal Government in consultation with the Chief Justice

Correct Answer Logic:

Article 10, Explanation I(i) provides that the Review Board for preventive detention under Federal law is 'appointed by the Chief Justice of Supreme Court of Pakistan and consisting of a Chairman and two other persons, each of whom is or has been a Judge of the Supreme Court or a High Court.' The insertion of 'Supreme Court of' was added by the 27th Amendment.

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Boilers Mechanical Engineering QUESTION #2386

Question 9551

The steady-state error for a unit step input applied to a type-zero closed-loop system (with unity feedback) is:

$E_s = 0$
$E_s = \frac{1}{1+K_p}$ where $K_p = \lim_{s\to 0} Y_1(s)$✔️
$E_s = 1$
$E_s = \infty$

Correct Answer Logic:

For a type-zero system with unit step input: $E_s=\frac{1}{1+Y_1(0)}=\frac{1}{1+K_p}$ where $K_p$ is the position error constant. For a type-one system (pole at origin), $E_s=0$ for a step input.

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Geology QUESTION #10635

Question 9552

Geographic coordinates expressed as latitudes and longitudes define a location in terms of:

Relative location
Absolute location✔️
Topological position
Map projection

Correct Answer Logic:

Latitude and longitude define an absolute location — a fixed, mathematically precise position on Earth's surface expressed in angular degrees from the equator (latitude) and from the Prime Meridian (longitude). Absolute location is independent of surrounding features. In contrast, relative location describes a position with reference to other places (e.g. 'north of the river').

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Paper-I (Anatomy/Physiology and Biochemistry/Microbiology) QUESTION #3502

Question 9553

'Catechu' (Katha) is primarily used in medicine as a/an:

Astringent✔️
Antibiotic
Vitamin
Hormone

Correct Answer Logic:

Astringents cause contraction of tissues and are used for diarrhea and skin ulcers.

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Paper-II (Pharmacognosy and Pharmaceutics-I) QUESTION #3008

Question 9554

The 'Stokes' Law' is used to determine the:

Rate of dissolution
Rate of sedimentation in a suspension✔️
Weight of a tablet
Volume of an injection

Correct Answer Logic:

Stokes' Law calculates the sedimentation velocity of particles in a fluid.

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HR and Management QUESTION #6447

Question 9555

The six basic HRM functions that must be performed regardless of organization size include all EXCEPT:

Staffing and human resource development
Compensation and benefits
Marketing and sales operations✔️
Safety and health

Correct Answer Logic:

The six basic HRM functions are: (1) Staffing, (2) HR development, (3) Compensation and benefits, (4) Safety and health, (5) Employee and labor relations, (6) Records maintaining and HR research. Marketing and sales are separate organizational functions, not core HRM responsibilities.

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General Knowledge QUESTION #4766

Question 9556

Where is the headquarters of Amnesty International located?

Geneva
London✔️
Paris
New York

Correct Answer Logic:

Amnesty International's International Secretariat is headquartered in London, United Kingdom. The organization was founded in London in 1961.

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Math Physics Chemistry Biology QUESTION #11376

Question 9557

A part of plasma membrane controls the fluidity of the membrane:

Glycoproteins
Carrier protein
Cholesterol✔️
Carbohydrates

Correct Answer Logic:

Cholesterol molecules are interspersed among the phospholipid bilayer and act as a fluidity buffer. At high temperatures, cholesterol restrains phospholipid movement (reducing fluidity); at low temperatures, it prevents tight packing (preventing solidification). This maintains optimal membrane fluidity across temperature changes.

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Electronics Engineering QUESTION #11735

Question 9558

A vector network analyser (VNA) is calibrated with SOLT (Short-Open-Load-Thru) standards. The purpose of calibration is to:

Set the power output level of the VNA source
Move the reference measurement plane to the DUT connectors and remove systematic errors✔️
Align the frequency markers on the display
Set the 50 Ω impedance of the output port

Correct Answer Logic:

VNA calibration characterises and mathematically removes systematic errors — directivity, source/load match, and frequency response of cables, adapters, and connectors — shifting the measurement reference plane to the Device Under Test (DUT). Without calibration, measurements include the electrical characteristics of the test setup itself, rendering S-parameter results meaningless.

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Maths QUESTION #7650

Question 9559

Which of the following is a surd?

$\sqrt{16}$
$\sqrt{16} + \sqrt{25}$
$\sqrt{21}$✔️
None of these

Correct Answer Logic:

A surd is an irrational root that cannot be simplified to a rational number. $\sqrt{16} = 4$ and $\sqrt{25} = 5$ are rational numbers. However, $\sqrt{21}$ cannot be simplified to a whole number or fraction, making it a surd (irrational number).

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Biology Zoology Botany QUESTION #10808

Question 9560

Corticotropin-releasing hormone (CRH) stimulates the synthesis or secretion of which hormone from the pituitary gland?

TSH
ACTH✔️
GH
FSH

Correct Answer Logic:

CRH (Corticotropin-Releasing Hormone), secreted by the hypothalamus, stimulates the anterior pituitary to synthesise and release ACTH (Adrenocorticotropic Hormone). ACTH then acts on the adrenal cortex to stimulate cortisol production. This forms the HPA (Hypothalamic-Pituitary-Adrenal) axis, the primary stress response system. TSH is stimulated by TRH; FSH and LH by GnRH; GH by GHRH — all via separate hypothalamic hormones.

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