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Carbon Dioxide (CO2) is considered the most significant greenhouse gas contributing to climate change due to its high concentration in the atmosphere and long atmospheric lifetime, largely from burning fossil fuels.

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Statistics QUESTION #1979

Question 5

A box contains 4 bad and 6 good tubes. Two tubes are drawn at random. Given that one tested tube is good, the probability that the other is also good using the conditional probability approach is:

$\dfrac{1}{3}$
$\dfrac{5}{9}$
$\dfrac{5}{14}$
$\dfrac{5}{13}$✔️

Correct Answer Logic:

Let A = both good, B = at least one good. $P(A) = \binom{6}{2}/\binom{10}{2} = 15/45 = 1/3$. $P(B) = 1 - P(\text{both bad}) = 1 - \binom{4}{2}/\binom{10}{2} = 1 - 6/45 = 39/45$. But the condition is one specific tube tested is good: $P(\text{other good}|\text{one is good}) = \frac{5}{9}$ using hypergeometric reasoning on remaining 9 tubes (5 good, 4 bad). Answer is $\dfrac{5}{9}$.

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CISA QUESTION #1786

Question 6

In the context of compliance testing, which term describes the difference between the audit sample result and the total population?

Precision✔️
Tolerable error rate
Level of risk
Analytic delta

Correct Answer Logic:

Precision in compliance testing refers to the expected error rate of the sample relative to the total population. It defines the acceptable range of deviation between what was observed in the sample and what likely exists across the full data set. Precision is typically expressed as a percentage.

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Physics QUESTION #7222

Question 7

Using mass ($M$), length ($L$), time ($T$), and electric current ($A$) as fundamental quantities, the dimensions of magnetic permeability are:

$[M^1L^1T^{-2}A^{-2}]$
$[ML^{-2}T^{-2}A^{-1}]$
$[MLT^{-2}A^{-2}]$✔️
$[MLT^{-1}A^{-1}]$

Correct Answer Logic:

Magnetic permeability $\mu_0$ appears in: $F = \dfrac{\mu_0}{4\pi}\dfrac{I_1 I_2 l}{r}$

$[\mu_0] = \dfrac{[F][r]}{[I]^2[l]} = \dfrac{MLT^{-2} \cdot L}{A^2 \cdot L} = MLT^{-2}A^{-2}$

Alternatively, from $B = \mu_0 H$: $[H] = AL^{-1}$, $[B] = MT^{-2}A^{-1}$, so $[\mu_0] = \frac{[B]}{[H]} = \frac{MT^{-2}A^{-1}}{AL^{-1}} = MLT^{-2}A^{-2}$

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Biology Zoology Botany QUESTION #1366

Question 8

The tallest living plant species belongs to the group of:

Pteridophytes
Angiosperms
Gymnosperms✔️
Bryophytes

Correct Answer Logic:

The tallest living plant species is the coast redwood (Sequoia sempervirens), which belongs to Gymnosperms (specifically the family Cupressaceae). The tallest known individual, named Hyperion, stands at about 115.9 metres. Gymnosperms include conifers, cycads, and ginkgo — many of which are among the tallest and oldest living organisms.

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Library Sciences QUESTION #1538

Question 9

According to Evans et al. (2007), which principle of organizing ensures that each employee receives instructions and is accountable to only one supervisor?

Span of Control
Unity of Command✔️
Division of Labor
Scalar Chain

Correct Answer Logic:

Unity of Command is the organizing principle that each employee should report to and receive instructions from only one supervisor. Dual reporting relationships create confusion and conflict. This principle, originating with Fayol, remains relevant in library organizational design.

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Math (Module-1) QUESTION #5382

Question 10

Given the system of equations $s + 7v = 34$ and $s = 6v$, what is the specific value of $v$ that satisfies both?

$\frac{34}{13}$✔️
$\frac{34}{7}$
$24$
$\frac{1}{6}$

Correct Answer Logic:

Substitute $s = 6v$ into the first equation: $6v + 7v = 34 \Rightarrow 13v = 34 \Rightarrow v = \frac{34}{13}$.

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MCQs Section QUESTION #4851

Question 11

Choose the word nearly similar in meaning to "LOGGIA"

Pathway
Marsh
Gallery✔️
Carriage

Correct Answer Logic:

A loggia is a gallery or room with one or more open sides, especially one that forms part of a house and has one side open to the garden. It is an architectural term of Italian origin.

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English QUESTION #8473

Question 12

Select the word OPPOSITE in meaning to: Incline

refuse✔️
rise
feel
natural

Correct Answer Logic:

Incline means to be willing or tend toward; opposite is refuse.

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Civil Engineering QUESTION #6594

Question 13

A joint provided within the length of a column to connect two column segments is specifically called a:

Shear joint
Load-bearing joint
Column splice✔️
Compression joint

Correct Answer Logic:

A column splice is a structural connection used to join two lengths of a column. It must transmit axial compression, bending, and shear, and is designed per relevant steel design codes (e.g. AISC).

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Ability / HR / Governance / Special Education QUESTION #5641

Question 14

A government servant exercises re-appropriation powers to move funds from a Development scheme to meet Current Expenditure of his Ministry without the consent of the Financial Adviser. Which TWO prohibitions does this simultaneously violate?

It violates the rule against re-appropriation from one grant to another and the rule against re-appropriation from Development to Current Expenditure✔️
It violates only the rule against re-appropriation without Financial Adviser consent and the Prudence principle
It violates the Purpose principle under GFR and the Limitations principle since it will exceed Current Expenditure allocation
It violates the Rules and Regulations principle and the Public Advantage principle under GFR

Correct Answer Logic:

Two explicit restrictions apply simultaneously: (1) No re-appropriation may be made from Development to Current Expenditure and vice-versa and (2) without the previous consent of the Financial Adviser/Finance Division an authority may not meet by re-appropriation expenditure it is not empowered to meet by appropriation.

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Chemistry QUESTION #1424

Question 15

In gas chromatography, the mobile phase is:

Liquid
Gas✔️
Solid
None of these

Correct Answer Logic:

In gas chromatography (GC), the mobile phase is an inert carrier gas — typically helium, nitrogen, or hydrogen. The sample components partition between this gaseous mobile phase and the stationary phase (a liquid or solid coated on the column). In liquid chromatography (HPLC), the mobile phase is a liquid, and in thin-layer chromatography, it is a liquid solvent.

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Mathematics QUESTION #6963

Question 16

Find all $x$ satisfying $(\cot^{-1}x)^2 - 7(\cot^{-1}x)+10>0$.

$(-\infty,\cot5)\cup(\cot4,\cot2)$
$(\cot2,\infty)$
$(-\infty,\cot5)\cup(\cot2,\infty)$✔️
$(\cot5,\cot4)$

Correct Answer Logic:

Let $u=\cot^{-1}x$. Solve $u^2-7u+10>0$, i.e., $(u-2)(u-5)>0$.

This gives $u<2$ or $u>5$.

Since $\cot^{-1}x$ is a decreasing function with range $(0,\pi)$:

$u<2 \Rightarrow \cot^{-1}x<2 \Rightarrow x>\cot2$ (decreasing function reverses inequality)
$u>5 \Rightarrow \cot^{-1}x>5 \Rightarrow x<\cot5$

Solution: $x\in(-\infty,\cot5)\cup(\cot2,\infty)$

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Agronomy QUESTION #2051

Question 17

Conservation agriculture (CA) is based on three core principles. Which combination correctly identifies all three?

Deep plowing + high input use + crop rotation
Minimum soil disturbance (no/minimum tillage) + permanent soil cover (mulch/crop residues) + crop species diversification (rotation/intercropping)✔️
Organic farming + biological pest control + rainwater harvesting
Precision irrigation + slow-release fertilizers + integrated pest management

Correct Answer Logic:

FAO defines Conservation Agriculture by three linked principles: (1) minimum mechanical soil disturbance, (2) permanent organic soil cover with crop residues or cover crops, and (3) species diversification through crop rotations and/or intercropping. All three must be practiced simultaneously for CA to deliver its full benefits.

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Chemistry QUESTION #7379

Question 18

In Bohr's atomic model, how are orbital radius $r$ and energy $E$ related to orbit number $n$?

$r \propto n^2$ and $E \propto \dfrac{1}{n^2}$✔️
$r \propto \dfrac{1}{n^2}$ and $E \propto n^2$
$r \propto \dfrac{1}{n}$ and $E \propto n$
$E \propto n^2$ and $r \propto n^2$

Correct Answer Logic:

Bohr's model relationships:
$r_n = a_0 \cdot \dfrac{n^2}{Z}$ → $r \propto n^2$

$E_n = -13.6 \cdot \dfrac{Z^2}{n^2}$ eV → $E \propto -\dfrac{1}{n^2}$

As orbit number increases, radius increases (electrons move farther out) while energy becomes less negative (electrons become less tightly bound). For hydrogen (Z=1): $r_1 = 0.529$ Å (Bohr radius).

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Library Sciences QUESTION #1576

Question 19

In the context of IT-based library management, 'metadata harvesting' using the OAI-PMH (Open Archives Initiative Protocol for Metadata Harvesting) enables libraries to:

Physically collect rare items from other institutions
Automatically collect and aggregate metadata records from multiple distributed digital repositories into a single searchable interface✔️
Convert MARC records into RDA format
Manage staff attendance records

Correct Answer Logic:

OAI-PMH is a protocol that allows service providers to automatically harvest (collect) metadata records from multiple data providers (digital repositories, institutional repositories, open-access archives) and aggregate them into a unified searchable database — enabling federated discovery of distributed digital resources.

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General Knowledge QUESTION #9015

Question 20

Myanmar is the new name for which former country?

Barma (Burma)✔️
Nepal
Bhutan
Tibet

Correct Answer Logic:

Myanmar was formerly known as Burma.

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