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Boilers Mechanical Engineering QUESTION #2398

Question 141

Archimedes' principle states that the buoyant force on a submerged (or floating) body equals:

Weight of the body
Weight of fluid displaced by the body✔️
Pressure at the centroid times surface area
Volume of the body times its own density

Correct Answer Logic:

Archimedes' principle: buoyant force $F_B=\gamma_{fluid}\times V_{displaced}$ — equals the weight of fluid displaced.

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Planning QUESTION #4928

Question 142

In site planning, what is the recommended slope for wheelchair accessibility?

Maximum 1:12 (8.33%)✔️
Maximum 1:20 (5%)
Maximum 1:8 (12.5%)
Maximum 1:10 (10%)

Correct Answer Logic:

The standard maximum slope for wheelchair ramps is 1:12 (8.33%), ensuring safe and comfortable accessibility for people with mobility impairments while meeting universal design standards.

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Maths QUESTION #4601

Question 143

What is the coefficient of $x$ in $7x - 3$?

$-3$
$7$✔️
$4$
$7x$

Correct Answer Logic:

The coefficient is the number multiplying the variable. Coefficient of $x$ is $7$

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Paper-I (Anatomy/Physiology and Biochemistry/Microbiology) QUESTION #3347

Question 144

'Lyophilization' is a process used for:

Killing microbes with heat
Freeze-drying to preserve microbial cultures✔️
Staining slides
Testing water

Correct Answer Logic:

Water is removed under vacuum while the sample is frozen, allowing for long-term storage.

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Information Technology QUESTION #1151

Question 145

What is the primary role of a 'Foreign Key' in a relational database?

To uniquely identify a row
To ensure referential integrity✔️
To speed up searches
To sort data

Correct Answer Logic:

A Foreign Key is a field that links to the Primary Key of another table, ensuring that the relationship between data in the two tables remains consistent.

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Boilers Mechanical Engineering QUESTION #2409

Question 146

The bulk modulus of elasticity $E$ of a fluid is defined as:

$E = dp/(d\rho/\rho)$
$E = dp/(-dv/v)$ — ratio of pressure increase to fractional volume decrease
$E = \rho c^2$ where $c$ is sound speed
Both options B and C are correct expressions for $E$✔️

Correct Answer Logic:

Bulk modulus $E=-dp/(dV/V)=\rho c^2$. Both definitions are equivalent. For water: $E\approx2.1$ GPa.

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Math (Module-1) QUESTION #5478

Question 147

In the given system of equations, a parabola $y = ax^2 + bx + c$ intersects a line. If they intersect at exactly one point $(x, y)$, what is the value of $x$?

-8
-6✔️
6
8

Correct Answer Logic:

Based on the original SAT test key, the intersection point occurs at $x = -6$.

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Electronics Engineering QUESTION #11711

Question 148

A microwave amplifier has a noise figure (NF) of $3\,\text{dB}$ and gain of $20\,\text{dB}$. A second stage has NF $= 6\,\text{dB}$. The cascaded noise figure by Friis formula is approximately:

$9\,\text{dB}$
$3.02\,\text{dB}$✔️
$4.5\,\text{dB}$
$6\,\text{dB}$

Correct Answer Logic:

Friis formula: $F_{total} = F_1 + \dfrac{F_2 - 1}{G_1}$. In linear: $F_1 = 10^{3/10} = 2$, $G_1 = 10^{20/10} = 100$, $F_2 = 10^{6/10} \approx 4$. $F_{total} = 2 + \dfrac{4-1}{100} = 2 + 0.03 = 2.03$. $\text{NF}_{total} = 10\log(2.03) \approx \mathbf{3.08\,\text{dB}}$. The first-stage NF dominates; high first-stage gain minimises the contribution of subsequent stages.

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Business, Public administration and Policy QUESTION #10524

Question 149

Revenue distribution between Pakistan's federation and its provinces is constitutionally managed through:

Council of Common Interests (CCI)
National Economic Council (NEC)
Finance Committee of the Parliament
National Finance Commission (NFC)✔️

Correct Answer Logic:

The National Finance Commission (NFC), established under Article 160 of Pakistan's Constitution, is the constitutional mechanism for distributing revenues between the federal government and the four provinces. The NFC Award determines the divisible pool and its horizontal (inter-provincial) distribution criteria. The CCI coordinates federal-provincial policies on specified subjects, while the NEC addresses economic policy.

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Dairy Food Science and Technology QUESTION #5894

Question 150

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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Library Sciences QUESTION #1570

Question 151

In the context of public records management, the 'principle of provenance' (also called respect des fonds) requires that:

Records be arranged alphabetically by title
Records created by one organization or individual be kept together and not intermingled with records from other sources✔️
Records be digitized before physical preservation
Records older than 50 years be transferred to the national library

Correct Answer Logic:

The principle of provenance is a foundational archival principle stating that records from a given creator (person, family, or organization) must be maintained as a separate, intact group (fond) and not mixed with records from other creators — preserving their original context and evidential value.

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Agriculture Economics QUESTION #11870

Question 152

Under perfect competition, an individual firm is a 'price taker' because:

It sets the market price for all competitors
It is too small relative to the market to influence price✔️
Government regulates the price it charges
It faces a downward-sloping demand curve

Correct Answer Logic:

In perfect competition, each firm is small relative to the total market, so it must accept the prevailing market price.

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Paper-I (Anatomy/Physiology and Biochemistry/Microbiology) QUESTION #3331

Question 153

'Autoclave' tape is used to:

Kill bacteria
Keep the door closed
Provide a visual indicator that the package has been exposed to steam✔️
Wrap the samples

Correct Answer Logic:

The tape changes color (usually develops dark stripes) when the sterilization temperature is reached.

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Chemistry QUESTION #7415

Question 154

The reason for lanthanoid contraction is:

Negligible screening effect of f-orbitals (poor shielding by f-electrons)✔️
Increasing nuclear charge
Decreasing nuclear charge
Decreasing screening effect

Correct Answer Logic:

Lanthanoid contraction: The 14 lanthanoids show a gradual decrease in atomic/ionic radius from La to Lu.

Cause: The 4f electrons have a poor shielding effect (they cannot effectively shield each other or outer electrons from the increasing nuclear charge). As protons are added (Z increases from 58 to 71) with poor f-electron shielding, the effective nuclear charge experienced by outer electrons steadily increases, pulling them inward.

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Physics QUESTION #420

Question 155

Light year is a measure of

Distance✔️
Time
Intensity of light
Velocity

Correct Answer Logic:

Light year is a unit of distance

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Social Studies QUESTION #10070

Question 156

A marriage form in which a woman is permitted to have multiple husbands is known as:

Polygamy
Polyandry✔️
Polygyny
None of these

Correct Answer Logic:

Polyandry describes a marital arrangement where one woman has multiple husbands.

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CISA QUESTION #1734

Question 157

In professional practice, what does the concept of fiduciary responsibility fundamentally require of accountants, auditors, and legal professionals?

To utilise information obtained in engagements for personal advantage without breaching explicit confidentiality agreements.
To act in the best interests of the client, placing honesty, fairness, and duty ahead of personal self-interest — except where doing so would breach the law.✔️
To execute the client's wishes unconditionally and maintain total confidentiality, even in cases where illegal activity has been discovered.
None of the above.

Correct Answer Logic:

Fiduciary responsibility is the highest legal standard of care that professionals owe to those who place trust in them. It requires accountants, auditors, and lawyers to act in their client's best interests with complete honesty and fairness — but this duty is always subordinate to the law. Where compliance with a client's wishes would require violating the law, the fiduciary duty yields. It is fundamentally about acting as a trustworthy guardian of another's interests.

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Mathematics QUESTION #7433

Question 158

The expression $\frac{\tan A}{1-\cot A} + \frac{\cot A}{1-\tan A}$ can be written as:

sinA cosA + 1
secA cosecA + 1✔️
tanA + cotA
secA + cosecA

Correct Answer Logic:

Let's simplify: $\frac{\tan A}{1-\cot A} + \frac{\cot A}{1-\tan A} = \frac{\frac{\sin A}{\cos A}}{1-\frac{\cos A}{\sin A}} + \frac{\frac{\cos A}{\sin A}}{1-\frac{\sin A}{\cos A}} = \frac{\frac{\sin A}{\cos A}}{\frac{\sin A - \cos A}{\sin A}} + \frac{\frac{\cos A}{\sin A}}{\frac{\cos A - \sin A}{\cos A}} = \frac{\sin^2 A}{\cos A(\sin A - \cos A)} + \frac{\cos^2 A}{\sin A(\cos A - \sin A)} = \frac{\sin^2 A}{\cos A(\sin A - \cos A)} - \frac{\cos^2 A}{\sin A(\sin A - \cos A)} = \frac{\sin^3 A - \cos^3 A}{\sin A \cos A (\sin A - \cos A)} = \frac{(\sin A - \cos A)(\sin^2 A + \sin A \cos A + \cos^2 A)}{\sin A \cos A (\sin A - \cos A)} = \frac{1 + \sin A \cos A}{\sin A \cos A} = \sec A \csc A + 1$.

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