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Boilers Mechanical Engineering QUESTION #3979

Question 1

In a 'Fire Tube' boiler, which of the following is true regarding the heat exchange process?

Water circulates inside the tubes, surrounded by hot gases
Hot gases pass through the tubes, surrounded by water✔️
The boiler is only used for very high pressure ($>100~bar$)
There are no tubes used in the design

Correct Answer Logic:

Fire-tube boilers like the Lancashire or Locomotive types have hot gases inside tubes to heat the surrounding water.

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English QUESTION #823

Question 2

Pick the correct sentence about catching a first glimpse:

A day later he reached his first glimpse of Lahore.
A day later he took his first glimpse of Lahore.
A day later he found his first glimpse of Lahore.
A day later he caught his first glimpse of Lahore.✔️

Correct Answer Logic:

The correct collocation is 'catch a glimpse'. You catch a glimpse of something — not reach, take, or find it.

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Journalism / Mass Communication QUESTION #6351

Question 3

Which of the following BEST distinguishes semantic noise from physical noise in the Shannon-Weaver model of communication?

Physical noise originates inside the human brain whereas semantic noise is purely technical
Semantic noise arises from differences in knowledge, culture, experience, and prejudice between sender and receiver, while physical noise is mechanical interference in the channel✔️
Semantic noise only occurs in written communication whereas physical noise only occurs in oral communication
Both types of noise are identical; only their location in the model differs

Correct Answer Logic:

In the Shannon-Weaver model, physical noise refers to mechanical or engineering interference in the communication channel — for example, a crackling microphone, smudges on a printed page, or a loud motorbike interrupting a conversation. Semantic noise, by contrast, is far harder to eliminate. It arises when the sender and receiver do not share the same knowledge level, cultural background, experiences, or beliefs, so the decoded meaning differs from the intended one. Shannon himself was primarily an engineer focused on physical noise, but subsequent scholars extended his model to include semantic interference. Because semantic noise depends on the “field of experience” of each party (a concept later formalised by Schramm), it cannot be fixed by stronger signals alone — it requires shared context and mutual understanding.

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Chemistry QUESTION #7204

Question 4

Which of the following chemical equations demonstrates the oxidizing nature of hydrogen peroxide ($H_{2}O_2$)?

$2I^{-} + H_{2}O_{2} + 2H^{+} \rightarrow I_{2} + 2H_{2}O$✔️
$KIO_{4} + H_{2}O_{2} \rightarrow KIO_{3} + H_{2}O + O_{2}$
$Cl_{2} + H_{2}O_{2} \rightarrow 2HCl + O_{2}$
$I_{2} + H_{2}O_{2} + 2OH^{-} \rightarrow 2I^{-} + 2H_{2}O + O_{2}$

Correct Answer Logic:

An oxidizing agent is itself reduced. In option A, the oxidation state of Oxygen in $H_{2}O_{2}$ changes from $-1$ to $-2$ (in $H_{2}O$).
Since the oxidation state decreases, $H_{2}O_{2}$ is reduced, meaning it acted as an oxidizing agent for the Iodide ions ($I^{-}$ to $I_{2}$).

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Biomedical Sciences QUESTION #3800

Question 5

What is the physiological effect of parathyroid hormone (PTH) on calcium and phosphate metabolism?

Increased mobilisation of calcium from bone✔️
Decreased renal tubular reabsorption of calcium
Decreased resorption of phosphate from bone
Decreased excretion of phosphate

Correct Answer Logic:

PTH raises serum calcium by stimulating osteoclastic bone resorption, increasing renal tubular calcium reabsorption, and promoting renal phosphate excretion.

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Chemistry QUESTION #7377

Question 6

How many electrons can be accommodated in the orbital with $n = 3$ and $\ell = 1$?

10
14
2✔️
6

Correct Answer Logic:

For $n=3, \ell=1$: This specifies the entire 3p subshell (all three 3p orbitals combined). Wait — the question asks about a single orbital ($n=3, \ell=1$ without specifying $m$) or the subshell? If subshell: $2\ell+1=3$ orbitals × 2 = 6 electrons. If a single orbital: 2 electrons. The answer key shows 2, implying it refers to a single orbital (one specific 3p orbital). Each orbital holds exactly 2 electrons.

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Agronomy QUESTION #2034

Question 7

The modern concept of 'Precision Agronomy' involves:

Applying uniform rates of inputs across the entire field to simplify management
Using GPS, GIS, remote sensing, and variable-rate technology to apply inputs site-specifically based on within-field variability✔️
Increasing mechanization to reduce the requirement for agronomic knowledge
Replacing all chemical inputs with organic alternatives

Correct Answer Logic:

Precision agronomy (precision agriculture) uses GPS, GIS, remote sensing, and sensors to map within-field variability in soil properties, crop status, and yield. Variable-rate technology (VRT) then applies water, fertilizer, pesticides, and seeds at rates matched to specific needs of each zone, optimizing inputs and minimizing environmental impact.

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ETAG General Aptitude QUESTION #3767

Question 8

A circle $C_1$ (center $O_1$, radius $r_1=1$ cm) is tangent to two sides of a square $VWXY$ at a corner. Another circle $C_2$ (radius $r_2$) is tangent to the same two sides and also touches $C_1$. If the square side is 4 cm, find $r_2$ (in cm).

4 - 3\sqrt{2}
1 + 2\sqrt{2}
7 - 4\sqrt{2}✔️
5 + 3\sqrt{2}

Correct Answer Logic:

Using the diagonal distance: $\sqrt{2}(3-r_2) = 1+r_2$. Solving gives $r_2 = 7-4\sqrt{2}$.

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Chemistry QUESTION #436

Question 9

Which bond will break when electrophile attacks an alcohol?

O?H✔️
C?O
Both A and B
None of these

Correct Answer Logic:

Electrophile attacks the O-H bond in alcohols

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Chemistry QUESTION #1100

Question 10

The correct order of decreasing basic strength of amines:

N-ethylethanamine $>$ ethanamine $>$ N-methylaniline $>$ benzenamine✔️
benzenamine $>$ ethanamine $>$ N-methylaniline $>$ N-ethylethanamine
N-methylaniline $>$ benzenamine $>$ ethanamine $>$ N-ethylethanamine
N-ethylethanamine $>$ ethanamine $>$ benzenamine $>$ N-methylaniline

Correct Answer Logic:

Basic strength: aliphatic $>$ aromatic amines. Among aliphatic: secondary $>$ primary due to +I effect. N-ethylethanamine (diethylamine) $>$ ethanamine (ethylamine). Aromatic amines much weaker: N-methylaniline $>$ aniline (benzenamine) due to partial +I from methyl. Order: N-ethylethanamine $>$ ethanamine $>$ N-methylaniline $>$ benzenamine.

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General Knowledge QUESTION #8592

Question 11

Which bird is universally recognized as a symbol of peace?

Swan
Flamingo
Dove✔️
Duck

Correct Answer Logic:

The dove is a symbol of peace.

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English QUESTION #510

Question 12

INDOLENTLY

Lazily✔️
Indecently
Ideally
Gaily

Correct Answer Logic:

Indolently means lazily

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Chemistry QUESTION #7354

Question 13

A ball of mass 0.66 kg moves at 100 m/s. The de Broglie wavelength associated with it (given $h = 6.6 \times 10^{-34}$ Js) will be:

$6.6 \times 10^{-34}$ m
$1.0 \times 10^{-35}$ m✔️
$1.0 \times 10^{-32}$ m
$6.6 \times 10^{-32}$ m

Correct Answer Logic:

de Broglie formula: $\lambda = \dfrac{h}{mv}$

$\lambda = \dfrac{6.6 \times 10^{-34}}{0.66 \times 100} = \dfrac{6.6 \times 10^{-34}}{66} = 1.0 \times 10^{-35}$ m

This wavelength is vanishingly small, which is why macroscopic objects do not show observable wave behaviour — confirming why quantum effects are only relevant at the atomic/subatomic scale.

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Paper-I (Anatomy/Physiology and Biochemistry/Microbiology) QUESTION #3348

Question 14

Which metal is known for its 'Oligodynamic' antimicrobial action?

Iron
Silver✔️
Sodium
Calcium

Correct Answer Logic:

Very small amounts of heavy metals like silver or copper can kill bacteria.

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Math Physics Chemistry Biology QUESTION #4224

Question 15

Water commonly known as a universal solvent because:

It dissolves polar and ionic substances effectively✔️
It supports chemical reactions without reacting itself
It has a high specific heat capacity
It dissolves many substances due to its small molecule size

Correct Answer Logic:

Water dissolves polar and ionic substances due to its polarity.

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Pakistan Affairs QUESTION #7685

Question 16

Pakistan signed a long-term agreement with which country for discounted oil in 2023?

Iran
UAE
Saudi Arabia
None of these✔️

Correct Answer Logic:

In 2023, Pakistan signed agreements for discounted oil with multiple countries, but the question seems to seek a specific answer. Russia provided discounted crude oil to Pakistan. However, since Russia is not in the options, the answer is 'None of these'.

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Information Technology QUESTION #1113

Question 17

What is the main goal of Capability Maturity Model Integration (CMMI)?

To enhance maturity of software process✔️
To increase the quality of software
To provide user friendly experience
None of these

Correct Answer Logic:

The primary objective of CMMI is to provide a framework for improving the maturity of an organization's processes to improve performance and product quality.

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English QUESTION #2802

Question 18

Complete the ANALOGY: 'Author : Book :: Composer : ___'

Music
Song
Symphony✔️
Concert

Correct Answer Logic:

This analogy shows a 'creator : creation' relationship. An author creates a book; a composer creates a symphony (a musical composition). While 'music' is broader and 'song' is simpler, 'symphony' is the most precise equivalent to 'book' as a composed work.

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