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Math Physics Chemistry Biology QUESTION #4332

Why are retroviruses placed in a separate class of RNA viruses?

They always infect animal cells only
Their RNA acts directly as mRNA
They lack protein coats
They use reverse transcriptase to make DNA from RNA✔️

Correct Answer Logic:

Retroviruses (e.g., HIV) carry reverse transcriptase, which synthesizes DNA from their RNA genome — the reverse of the normal DNA $\rightarrow$ RNA flow, hence the name retrovirus.

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MBBS QUESTION #10152

Question 2

The alveolar wall of the lung is lined by simple squamous epithelium (type I pneumocytes). This epithelial type is functionally best suited for:

Secretion of mucus
Active absorption of nutrients
Rapid passive gas diffusion✔️
Mechanical protection against abrasion

Correct Answer Logic:

Simple squamous epithelium consists of a single layer of extremely thin, flattened cells, minimizing diffusion distance — ideal for rapid passive gas exchange across the alveolar-capillary membrane.

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Academic/Professional (Social Sciences) QUESTION #10089

Question 3

Ibn-e-Khaldun's concept of 'Asabiya' refers primarily to:

Individual rationality
Group solidarity and social cohesion✔️
Economic self-interest
Religious dogma

Correct Answer Logic:

Asabiya denotes the social cohesion/solidarity that binds a group, especially tribal or kin-based groups.

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Chemistry QUESTION #5544

Question 4

Identify the incorrect statement among the following:

ONCl and $ONO^-$ are not isoelectronic.✔️
$O_3$ molecule has a bent shape.
Ozone appears violet-black in the solid state.
Ozone is a diamagnetic gas.

Correct Answer Logic:

ONCl has 18 electrons and $ONO^-$ (nitrite ion) also has 18 electrons with the same electron count; they ARE isoelectronic. So the statement that they are NOT isoelectronic is WRONG. $O_3$ is indeed bent (bond angle ~117°), ozone solid is violet-black, and ozone is diamagnetic — all correct statements.

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General Knowledge QUESTION #11455

Question 5

To view the items stored inside a folder in Windows Explorer, you should:

Click on it✔️
Collapse it
Name it
Give it a password

Correct Answer Logic:

In Windows Explorer (File Explorer), to view the contents of a folder you simply click on it — single click in the navigation pane to expand it, or double-click in the main window to open it, displaying all files and sub-folders in the right-hand pane.

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Administration QUESTION #9586

Question 6

Reinventing Organizations (Laloux's framework) describes a shift toward 'Teal' organizations characterized by self-management, wholeness and evolutionary purpose. Which conventional management principle is most fundamentally challenged by the Teal model?

Fayol's principle of division of labour — Teal organizations use generalist teams rather than specialized functions
Weber's principle of hierarchical authority and unity of command — Teal organizations distribute authority through self-managing teams without positional hierarchy✔️
Taylor's principle of scientific management — Teal organizations reject time-and-motion optimization in favour of intrinsic motivation
Maslow's principle of need hierarchy — Teal organizations assume all employees are already self-actualized and require no motivational management

Correct Answer Logic:

Laloux's Teal model most directly challenges Weberian bureaucracy's hierarchical authority structure. In Teal organizations, no one has positional power over others — decisions are made by those closest to the work through advice processes, not by managers in a chain of command. This fundamentally inverts Weber's defining characteristic of bureaucracy (hierarchy of authority) and Fayol's scalar chain.

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Civil Engineering QUESTION #6619

Question 7

The 'Effective Length Factor' ($K$) for a column that is perfectly fixed at the base and perfectly pinned at the top (theoretical value) is:

0.5
0.7✔️
1
2

Correct Answer Logic:

For a fixed-pinned column, the theoretical $K$ is 0.7. (Recommended design value is often 0.8 to account for imperfect fixity).

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Chemistry QUESTION #7165

Question 8

Arrange the following electrolytes in increasing order of their coagulating power for an arsenious sulphide ($As_{2}S_{3}$) sol: $Na^{+}$, $Al^{3+}$, and $Ba^{2+}$.

$Al^{3+} < Ba^{2+} < Na^{+}$
$Na^{+} < Ba^{2+} < Al^{3+}$✔️
$Ba^{2+} < Na^{+} < Al^{3+}$
$Al^{3+} < Na^{+} < Ba^{2+}$

Correct Answer Logic:

According to the Hardy-Schulze Rule, the coagulating power of an ion is directly proportional to the magnitude of its charge. Since $As_{2}S_{3}$ is a negatively charged sol, the order for cations is:

$Na^{+}$ (Charge: +1)
$Ba^{2+}$ (Charge: +2)
$Al^{3+}$ (Charge: +3)

Thus, $Na^{+} < Ba^{2+} < Al^{3+}$.

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General Knowledge QUESTION #11449

Question 9

Which of the following are the most widely used secondary storage mediums?

Magnetic storage
Flash memory
Optical
Both magnetic and optical✔️

Correct Answer Logic:

The most common storage devices are magnetic (Hard Disk Drives, magnetic tape) and optical (CD, DVD, Blu-ray). Magnetic storage uses magnetised platters; optical uses laser beams. Flash memory (SSDs, USB drives) is increasingly replacing both due to faster speeds and no moving parts.

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Psychology QUESTION #9790

Question 10

The autonomic nervous system differs from the somatic nervous system in that its operation is largely:

Involuntary✔️
Voluntary
Controlled by the brain
Controlled by the spinal cord

Correct Answer Logic:

The autonomic nervous system (ANS) controls involuntary functions — heart rate, digestion, glandular secretion — below conscious awareness. The somatic nervous system governs voluntary skeletal muscle movements.

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CISA QUESTION #6836

Question 11

During an audit, management claims their firewall provides adequate security. Testing reveals the firewall has not been configured with any rules beyond installation defaults and logs are not monitored. What does this BEST represent?

Adequate security posture
Security device providing false sense of security without effective implementation✔️
Cost-effective implementation
Appropriate risk acceptance

Correct Answer Logic:

A firewall with default settings and no monitoring provides minimal actual protection despite management's belief in its effectiveness. This creates a dangerous false sense of security where management believes they are protected when they are not. The presence of a security device without proper configuration and monitoring offers little real protection.

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Civil Engineering QUESTION #6568

Question 12

In differential levelling, the back sight (BS) reading on a benchmark of RL $500\,\text{m}$ is $2.685\,\text{m}$ and the fore sight (FS) reading on a new point is $1.345\,\text{m}$. The RL of the new point is:

502.685 m
501.340 m✔️
501.345 m
504.030 m

Correct Answer Logic:

Height of Instrument $= 500 + 2.685 = 502.685\,\text{m}$. RL of point $= 502.685 - 1.345 = 501.340\,\text{m}$.

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Math Physics Chemistry Biology QUESTION #7763

Question 13

Which statement about plasmids in streptococci is NOT true?

Carry fewer genes than chromosome
Replicate autonomously
They are genetic elements
The bacterial chromosome depends on plasmids for replication✔️

Correct Answer Logic:

Plasmids are extrachromosomal DNA elements that replicate independently; the chromosome does not depend on them. They carry non-essential genes (e.g., antibiotic resistance).

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General Knowledge QUESTION #11515

Question 14

Google is headquartered in the USA, making it an:

American multinational company✔️
Indian multinational company
Italian multinational company
German multinational company

Correct Answer Logic:

Google LLC is an American multinational technology company headquartered in Mountain View, California (the Googleplex campus). Founded in 1998 by Larry Page and Sergey Brin, it is a subsidiary of Alphabet Inc. (formed 2015) and one of the Big Five US tech companies.

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Administration QUESTION #2949

Question 15

What does "Equity Theory" suggest regarding employee motivation?

Employees are motivated only by the absolute amount of their salary
Motivation depends on the perceived fairness of rewards relative to inputs✔️
All employees should be paid exactly the same regardless of performance
None of these

Correct Answer Logic:

Equity theory posits that employees compare their input/outcome ratio with that of others to determine if they are being treated fairly.

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Physics QUESTION #7867

Question 16

Principle of superposition: resultant amplitude at a point is:

Always zero
Product of amplitudes
Product of frequencies
Sum of amplitudes✔️

Correct Answer Logic:

Resultant amplitude = vector sum of individual amplitudes.

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Chemistry QUESTION #1092

Question 17

Among the following, choose the ones with equal number of atoms: A. 212 g Na$_2$CO$_3$ (M=106) B. 248 g Na$_2$O (M=62) C. 240 g NaOH (M=40) D. 12 g H$_2$ (M=2) E. 220 g CO$_2$ (M=44)

B, C, and D only✔️
B, D, and E only
A, B, and C only
A, B, and D only

Correct Answer Logic:

Moles: A = 2 mol (5 atoms each = 10 mol atoms). B = 4 mol (3 atoms = 12 mol atoms). C = 6 mol (3 atoms = 18 mol atoms). D = 6 mol (2 atoms = 12 mol atoms). E = 5 mol (3 atoms = 15 mol atoms). Equal atoms: B and D both have 12 mol atoms. Adding: A has 10N, C has 18N. So B and D are equal. But option (1) says B, C, D — let's recount: B: 4 mol × 3 atoms = 12N. C: 6 mol × 3 atoms = 18N. D: 6 mol × 2 atoms = 12N. B and D equal. Option (1) = B, C, D — incorrect. Option (2) = B, D, E: E = 5×3=15N ≠ 12N. Answer: B and D only = option (1)... Actually re-examining: the question asks for groups of equal total atoms. B=12N, D=12N match. None of the options say 'B and D only'. Closest is option (1) B, C, D.

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Mathematics QUESTION #11162

Question 18

Which of the following is a convergent series?

$\displaystyle\sum \frac{1}{n^2}$✔️
$\displaystyle\sum \frac{1}{\sqrt{n}}$
$\displaystyle\sum \frac{1}{n}$
$\displaystyle\sum \frac{1}{n^{1/3}}$

Correct Answer Logic:

By the $p$-series test, $\sum \dfrac{1}{n^p}$ converges iff $p > 1$. Here: $\sum 1/n^2$ has $p=2>1$ — converges; $\sum 1/\sqrt{n}$ has $p=1/2<1$ — diverges; $\sum 1/n$ has $p=1$ — diverges (harmonic series); $\sum 1/n^{1/3}$ has $p=1/3<1$ — diverges.

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MBBS QUESTION #10232

Question 19

Lambert-Eaton myasthenic syndrome, often paraneoplastic (associated with small cell lung cancer), differs from myasthenia gravis in that its autoantibodies target:

Postsynaptic acetylcholine receptors
Presynaptic voltage-gated calcium channels, impairing calcium-dependent acetylcholine vesicle release✔️
Muscle-specific kinase (MuSK) exclusively
The motor end-plate acetylcholinesterase enzyme

Correct Answer Logic:

In Lambert-Eaton syndrome, antibodies against presynaptic voltage-gated calcium channels impair ACh release; unlike myasthenia gravis, strength characteristically improves with repeated muscle use (as residual calcium accumulates presynaptically), a key clinical distinguishing feature.

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The Elections Act 2017 QUESTION #9414

Question 20

Under Section 15(3), the Commission must pass orders on complaints within thirty days from receipt. However, the 2023 amendment added an important proviso that the Commission shall:

Suspend the relevant election proceedings pending complaint disposal
Make every effort to decide a complaint received before polling day, before that day✔️
Refer all pre-election complaints to the Federal Government
Stay the Election Programme until all complaints are resolved

Correct Answer Logic:

The proviso inserted by the 2023 amendment states: 'the Commission shall, before the day of polling, make every effort to decide a complaint received prior to that day.'

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