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Sampling error decreases as sample size increases, because larger samples yield better parameter estimates. The standard error $SE = \dfrac{\sigma}{\sqrt{n}}$ decreases as $n$ increases.

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Computer Science QUESTION #1146

Question 1765

What does the 'A' in ACID properties of a database stand for?

Availability
Atomicity✔️
Authentication
Accuracy

Correct Answer Logic:

Atomicity ensures that a transaction is treated as a single "unit," which either succeeds completely or fails completely.

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Paper-II (Pharmacognosy and Pharmaceutics-I) QUESTION #2954

Question 1766

Which mechanism describes the 'Leaching' effect in glass containers used for alkaline preparations?

Adsorption of drug to glass
Release of alkali from glass into the preparation✔️
Evaporation of solvent
Oxidation of the active ingredient

Correct Answer Logic:

Type II and III glass can release surface alkalis when in contact with water or alkaline solutions, affecting the stability of the drug.

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English QUESTION #2736

Question 1767

Convert to PASSIVE VOICE: 'Will they announce the result?'

Will the result be announced by them?✔️
Will the result announced by them?
The result will be announced.
Was the result announced by them?

Correct Answer Logic:

In passive voice for future simple questions: Will + object + be + past participle + by + agent. 'Will the result be announced by them?' is correct.

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Security Measures to Maintain Law and Order QUESTION #851

Question 1768

When maintaining order, the "Principle of Proportionality" in the use of force means:

Force must equal the threat✔️
Force must exceed the threat
Use of force is never allowed
Force is used only on weekends

Correct Answer Logic:

Ethics in security require that the level of force used must be the minimum necessary to neutralize the specific threat encountered.

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Agronomy QUESTION #2101

Question 1769

Leghemoglobin in legume root nodules serves the critical function of:

Providing carbon skeleton for amide synthesis and nitrogen export to shoots
Maintaining microaerophilic conditions within the infected nodule cells — binding O₂ at high affinity to supply it to bacteroid respiration while keeping free O₂ concentration low enough to protect the oxygen-sensitive nitrogenase enzyme from irreversible inactivation✔️
Transporting fixed nitrogen (as ureides or amides) from nodule to xylem
Synthesizing ATP required for the high energy demand of the nitrogenase reaction

Correct Answer Logic:

Leghemoglobin (a plant-encoded heme protein, heme supplied by bacteroid) maintains the paradox of nodule metabolism: bacteroids need O₂ for ATP production (nitrogenase is highly energy-demanding: 16 ATP/N₂) but nitrogenase is irreversibly destroyed by O₂. Leghemoglobin buffers O₂ at ~10⁻⁸ M (vs atmospheric ~0.2 mM), supplying O₂ for respiration while keeping free O₂ below inhibitory levels — the pink nodule color indicates active BNF.

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Physics QUESTION #1153

Question 1770

The zeroth law of thermodynamics helps to define the term:

Temperature✔️
Pressure
Volume
Density

Correct Answer Logic:

The zeroth law of thermodynamics states that if two systems are each in thermal equilibrium with a third system, they are in thermal equilibrium with each other. This law provides the basis for defining and measuring temperature.

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Paper-I (Anatomy/Physiology and Biochemistry/Microbiology) QUESTION #3105

Question 1771

The fluid portion of the blood after it has clotted is called:

Plasma
Serum✔️
Lymph
Cytosol

Correct Answer Logic:

Serum is plasma without the clotting factors (like fibrinogen).

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MCQs Section QUESTION #4882

Question 1772

Which word is similar to "VOID"

Emptiness✔️
Lea
Anger
Trick

Correct Answer Logic:

Void means a completely empty space or a feeling of emptiness. Emptiness is its closest synonym.

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Electrical Engineering QUESTION #2187

Question 1773

A long straight conductor carries $I = 10\,\text{A}$. The magnetic flux density $B$ at a perpendicular distance $r = 2\,\text{cm}$ from it (in free space) is:

$100\,\mu\text{T}$✔️
$50\,\mu\text{T}$
$200\,\mu\text{T}$
$25\,\mu\text{T}$

Correct Answer Logic:

$B = \frac{\mu_0 I}{2\pi r} = \frac{4\pi\times10^{-7}\times10}{2\pi\times0.02} = \frac{4\times10^{-6}}{0.04\pi}\times\pi = \frac{4\times10^{-6}}{0.04} = 10^{-4}\,\text{T} = 100\,\mu\text{T}$.

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Paper-II (Pharmacognosy and Pharmaceutics-I) QUESTION #3062

Question 1774

What is the 'HLB Value' system used for?

Measuring drug potency
Classifying surfactants for emulsions✔️
Calculating doses for the elderly
Determining glass type

Correct Answer Logic:

The Hydrophilic-Lipophilic Balance (HLB) value helps select the right emulsifying agent.

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General Knowledge QUESTION #4476

Question 1775

_____ Framework for Disaster Risk Reduction is in vogue for 2015–2030.

Sendai✔️
Yokohama
Hyogo
None of these

Correct Answer Logic:

The Sendai Framework for Disaster Risk Reduction (2015–2030) is the current global framework.

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Paper-I (Anatomy/Physiology and Biochemistry/Microbiology) QUESTION #3285

Question 1776

Which method is considered the most reliable form of 'Moist Heat' sterilization?

Boiling water
Pasteurization
Autoclaving (Steam under pressure)✔️
Hot air oven

Correct Answer Logic:

Autoclaving at $121^\circ\text{C}$ for $15$ minutes is standard for killing resistant endospores.

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Security Measures to Maintain Law and Order QUESTION #961

Question 1777

What is the final step in a security 'Search' process?

Releasing the person
Documenting the findings if necessary✔️
Taking a break
Asking for a bribe

Correct Answer Logic:

Professional documentation of any seizures or findings is required for legal and administrative purposes.

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Pakistan Affairs QUESTION #290

Question 1778

What was the notable feature of the Government of India Act of 1935?

Complete representation
Introduction of a federal structure✔️
Launching Khilafat Movement
Granting complete independence

Correct Answer Logic:

It proposed a 'Federation of India' comprising British provinces and princely states.

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Physics QUESTION #1152

Question 1779

The energy of a simple harmonic motion depends upon:

Mass
Frequency
Both Mass and Frequency✔️
None of these

Correct Answer Logic:

The total energy of SHM is given by $E = \frac{1}{2}m\omega^2 A^2 = 2\pi^2 m f^2 A^2$, where $m$ is mass, $f$ is frequency, and $A$ is amplitude. So energy depends on both mass and frequency.

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Paper-I (Anatomy/Physiology and Biochemistry/Microbiology) QUESTION #3296

Question 1780

An 'Antigen' is best defined as a substance that:

Kills bacteria
Is produced by white blood cells
Can trigger an immune response✔️
Is found only in viruses

Correct Answer Logic:

Antigens are usually proteins or polysaccharides that the body recognizes as 'foreign'.

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