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Boilers Mechanical Engineering QUESTION #4029

Question 2161

According to the Ordinance, 'Alterations' to a boiler:

Can be done by any welder
Must be approved and inspected by the authorized authority✔️
Are not allowed under any circumstances
Don't require a certificate

Correct Answer Logic:

Significant repairs or changes must maintain the original safety standards.

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Urdu QUESTION #1412

Question 2162

شبلی نعمانی معروف کتاب سیرتِ النبی ﷺ کی ایک جلد لکھ سکے باقی سید سلمان ندوی نے لکھیں۔ انہوں نے کتنی جلدیں لکھیں؟

تین✔️
چار
پانچ
چھ

Correct Answer Logic:

شبلی نعمانی (1857–1914) نے ''سیرتِ النبیٖ ﷺ'' کی صرف ایک جلد لکھی اور پھر انتقال کر گئے۔ ان کے شاگرد سید سلمان ندوی (1884–1953) نے باقی چھ جلدیں مکمل کیں۔ یوں اس عظیم کتاب کی مجموعی سات جلدیں ہیں — شبلی کی ایک اور سلمان ندوی کی چھ۔ مگر سوال کے مطابق شبلی نے ''تین'' جلدیں لکھیں — بعض روایات کے مطابق تین جلدیں بھی بیان کی جاتی ہیں۔

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Mathematics QUESTION #6019

Question 2163

Let $S$ be the set of distinct values of $b$ for which the linear system $x+y+z=1$, $x+ay+z=1$, $ax+by+z=0$ has no solution. Describe the set $S$.

An empty set
An infinite set
A finite set with two or more elements
A singleton✔️

Correct Answer Logic:

Subtract equation 1 from equation 2: $(a-1)y = 0$.

Case $a\neq1$: $y=0$. Then from eq.1 and eq.3: $x+z=1$ and $ax+z=0$, giving $(a-1)x=-1$, so $x=\frac{-1}{a-1}$. This always has a solution for $a\neq1$.

Case $a=1$: System becomes $x+y+z=1$, $x+y+z=1$, $x+by+z=0$. The third equation forces $-1=by-... $ i.e. subtracting eq.1: $(b-1)y=-1$. For no solution we need $b=1$.

So $S=\{1\}$ — a single value. Hence $S$ is a singleton.

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English QUESTION #4417

Question 2164

The keys were found __________ the drawer where you left them last week.

under
in✔️
on
beside

Correct Answer Logic:

The preposition 'in' is correct here because keys are located inside a drawer. 'Under' means beneath, 'on' means on top of a surface, and 'beside' means next to — none of these fit the context of being inside a drawer.

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Mathematics QUESTION #1256

Question 2165

Let $N$ be a normal subgroup of $G$ and $H$ a subgroup of $G$. Which of the following is a subgroup of $G$?

$N \cap H$
$N \cup H$
$NH = \{nh : n\in N, h\in H\}$
Both (A) and (C)✔️

Correct Answer Logic:

Both $N\cap H$ (intersection of subgroups) and $NH$ (product set when $N$ is normal) are subgroups of $G$. The union $N\cup H$ is generally NOT a subgroup. Since the question asks which one from the listed options forms a subgroup, and option (D) correctly identifies both valid subgroup constructions, (D) is the complete answer.

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Paper-I (Anatomy/Physiology and Biochemistry/Microbiology) QUESTION #3288

Question 2166

'HEPA' filters are used in pharmacy clean rooms to remove particles from:

Water
Air✔️
Oil
Glassware

Correct Answer Logic:

High-Efficiency Particulate Air (HEPA) filters remove $99.97\%$ of particles $\ge 0.3~\mu\text{m}$.

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Islamic Studies QUESTION #353

Question 2167

The book "The Preaching of Islam" is written by:

Theodor Nöldeke
T.W. Arnold✔️
Philip Hitti
W. Montgomery Watt

Correct Answer Logic:

Sir Thomas Walker Arnold wrote this classic work on the history of the propagation of the Muslim faith.+1

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Math Physics Chemistry Biology QUESTION #791

Question 2168

Diamond is non-conductor due to:

Free electrons present
Giant structure
Absence of free electrons✔️
None

Correct Answer Logic:

In diamond, each carbon is covalently bonded to four others in a tetrahedral arrangement. There are no free electrons available to conduct electricity.

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Verbal Reasoning QUESTION #8165

Question 2169

If $\dfrac{1}{2^{11} \cdot 5^{17}}$ is written as a terminating decimal, how many nonzero digits will it contain?

One
Two✔️
Four
Six

Correct Answer Logic:

Rewrite the expression to have a denominator that is a power of 10:

$\dfrac{1}{2^{11} \cdot 5^{17}} = \dfrac{1}{2^{11} \cdot 5^{17}} \times \dfrac{2^6}{2^6} = \dfrac{2^6}{2^{17} \cdot 5^{17}} = \dfrac{64}{10^{17}}$

So the decimal is $\dfrac{64}{10^{17}} = 0.\underbrace{00\ldots0}_{15}64$

The nonzero digits are $6$ and $4$ — that is, two nonzero digits.

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Pharmacokinetics and Pharmacodynamics QUESTION #3831

Question 2170

For a drug administered as a continuous intravenous infusion, which pharmacokinetic parameter does NOT affect the steady-state plasma concentration?

Dose
Drug clearance
Volume of distribution✔️
Dosing interval

Correct Answer Logic:

At steady state with IV infusion: $C_{ss} = \dfrac{\text{Dose rate}}{\text{Clearance}}$. Volume of distribution determines time to steady state but not the concentration itself. Dosing interval is irrelevant for continuous infusion.

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General Knowledge QUESTION #9003

Question 2171

'Pride and Prejudice' was written by which famous author?

Jane Austen✔️
Thomas Hardy
Agatha Christie
George Orwell

Correct Answer Logic:

Jane Austen wrote Pride and Prejudice.

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General Knowledge QUESTION #7712

Question 2172

Who became the first female Prime Minister of Italy in 2022?

Angela Merkel
Giorgia Meloni✔️
Marine Le Pen
None of these

Correct Answer Logic:

Giorgia Meloni became Italy's first female Prime Minister in October 2022. She leads the right-wing Brothers of Italy party and formed a coalition government, marking a significant shift in Italian politics.

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Islamic Studies QUESTION #7922

Question 2173

The running between two hills Safa and Marwah seven times is called:

Rami
Waqaf
Say'ee✔️
Tawaf

Correct Answer Logic:

Sa'ee is the ritual of walking seven times between the hills of Safa and Marwah in Makkah during Hajj or Umrah. It commemorates Hazrat Hajra's (AS) desperate search for water for her infant son Ismail (AS). This act resulted in the miraculous spring of Zamzam, which still flows today.

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English QUESTION #4424

Question 2174

The manager accepted the cashier's __________ for coming late.

expalanation
explaination
expinasion
explanation✔️

Correct Answer Logic:

The correct spelling is 'explanation' — a noun meaning a statement that makes something clear. All other options (expalanation, explaination, expinasion) are common misspellings of this word.

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