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Boilers Mechanical Engineering QUESTION #2483

The velocity of a node B of a driver link in rotational motion (angular velocity $\omega = \dot{\phi}$, link length $L_{AB}$) is given by:

$v_{Bx} = -L_{AB}\dot{\phi}\sin\phi,\quad v_{By} = L_{AB}\dot{\phi}\cos\phi$✔️
$v_{Bx} = L_{AB}\dot{\phi}\cos\phi,\quad v_{By} = L_{AB}\dot{\phi}\sin\phi$
$v_{Bx} = L_{AB}\dot{\phi}^2\cos\phi,\quad v_{By} = -L_{AB}\dot{\phi}^2\sin\phi$
$v_{Bx} = -L_{AB}\ddot{\phi}\cos\phi,\quad v_{By} = L_{AB}\ddot{\phi}\sin\phi$

Correct Answer Logic:

Differentiating position equations $x_B=x_A+L_{AB}\cos\phi$ and $y_B=y_A+L_{AB}\sin\phi$ with respect to time: $v_{Bx}=-L_{AB}\dot{\phi}\sin\phi$ and $v_{By}=L_{AB}\dot{\phi}\cos\phi$.

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Paper-II (Pharmacognosy and Pharmaceutics-I) QUESTION #3006

Question 2

'Cracking' of an emulsion refers to:

The addition of flavor
Permanent separation of the two phases✔️
Formation of a thick cream layer
A change in the container's glass

Correct Answer Logic:

Cracking (or breaking) is the irreversible separation of the oil and water phases.

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General Knowledge QUESTION #8629

Question 3

What is the length of the famous Khyber Pass?

33 KM
53 KM✔️
73 KM
93 KM

Correct Answer Logic:

The Khyber Pass is approximately 53 kilometers long.

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Paper-II (Pharmacology and Social Behaviour, Law & Ethics and Computer Sciences) QUESTION #5757

Question 4

Atropine is contraindicated in patients with narrow-angle glaucoma because it causes:

Miosis
Mydriasis and potential rise in intraocular pressure✔️
Increased lacrimation
Decreased heart rate

Correct Answer Logic:

Atropine causes mydriasis (dilation), which can dangerously increase intraocular pressure in glaucoma.

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Math Physics Chemistry Biology QUESTION #580

Question 5

Name the neurotic disorder characterized by bouts of over eating of fattening foods.

Bulimia nervosa✔️
Dyspepsia
Anorexia nervosa
Salmonella

Correct Answer Logic:

Bulimia involves binge eating episodes

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English QUESTION #2652

Question 6

Convert to passive: 'Who wrote this book?'

By whom was this book written?
This book was written by whom?
Who was this book written by?
All of the above✔️

Correct Answer Logic:

All three forms are grammatically correct ways to turn an interrogative sentence into passive voice.

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English QUESTION #2707

Question 7

Choose the correct pair word: 'The ___ of the school is very strict.'

Principle
Principal✔️
Prince
Priest

Correct Answer Logic:

'Principal' refers to the head of an institution; 'principle' refers to a fundamental truth.

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Education QUESTION #6753

Question 8

A researcher finds that a well-known mathematics aptitude test correlates strongly with students' later success in engineering programs. This evidence most directly supports which type of validity?

Content validity, because the test covers math topics found in engineering
Predictive criterion validity, because test scores are related to a future performance criterion✔️
Concurrent criterion validity, because both measures exist at the same time
Construct validity, because mathematical aptitude is a theoretical construct

Correct Answer Logic:

Criterion validity is established by correlating test scores with an external criterion. When the criterion is measured at a future point in time (engineering success), this is predictive validity — a subtype of criterion validity. Content validity is about domain sampling; construct validity is about the underlying psychological construct. Concurrent validity uses a simultaneously-collected criterion.

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General Knowledge QUESTION #8971

Question 9

The area inside a computer frame where data and instructions are stored is called:

Memory✔️
Recorder
Hopper
Interpreter

Correct Answer Logic:

Computer memory stores data and instructions.

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Accounting & Finance QUESTION #6085

Question 10

In the absence of a formal partnership agreement, which of the following rules apply under standard partnership law?

Partners receive 10% interest per annum on loans to the business.
Partners receive 5% interest per annum on their capital.
No interest is charged on partners' drawings.
Partners are not entitled to a salary.

1 and 3
1 and 4
2 and 3
3 and 4✔️

Correct Answer Logic:

Under the UK Partnership Act 1890 (often used as the basis for these exams), if no agreement exists: no interest on capital, no salaries, no interest on drawings, and interest on partner loans is usually 5% (not 10%). Thus, only 3 and 4 are correct.

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Library Sciences QUESTION #1563

Question 11

Which type of library circulation system uses barcodes or RFID tags on both library cards and items, and automates the charging and discharging process through an Integrated Library System (ILS)?

Browne system
Ledger system
Automated circulation system✔️
Dummy card system

Correct Answer Logic:

Automated circulation systems use barcodes or RFID technology on items and patron cards, linked to an Integrated Library System (ILS), to automatically record loans, returns, renewals, and holds — replacing manual systems like the Browne system or ledger-based methods.

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Federal Rules of Evidence (US) QUESTION #3779

Question 12

During a civil trial for breach of contract, a witness testifies for the plaintiff. On cross-examination, the defense asks: 'Isn't it true that you were convicted of misdemeanor shoplifting 4 years ago?' The plaintiff objects. Is the conviction admissible for impeachment?

Yes, because it occurred within the last 10 years.
No, because misdemeanors are never admissible for impeachment.
Yes, if the court determines that the crime involved a dishonest act or false statement under Rule 609(a)(2).✔️
No, because its probative value is outweighed by the danger of unfair prejudice.

Correct Answer Logic:

Rule 609(a)(2) mandates the admission of any crime (felony or misdemeanor) for impeachment purposes if the court can readily determine that establishing the elements of the crime required proving—or the witness's admitting—a dishonest act or false statement.

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Mathematics QUESTION #7483

Question 13

Let $A = \{x \in \mathbb{R} : x$ is not a positive integer$\}$. Define a function $f: A \to \mathbb{R}$ as $f(x) = \frac{2x}{x-1}$, then f is:

not injective
neither injective nor surjective
surjective but not injective
injective but not surjective✔️

Correct Answer Logic:

For injectivity: if $f(x_1) = f(x_2)$, then $\frac{2x_1}{x_1-1} = \frac{2x_2}{x_2-1}$, giving $2x_1(x_2-1) = 2x_2(x_1-1)$, so $x_1x_2 - x_1 = x_2x_1 - x_2$, thus $x_1 = x_2$. So f is injective. For surjectivity to $\mathbb{R}$: given $y \in \mathbb{R}$, solve $\frac{2x}{x-1} = y$, getting $2x = yx - y$, so $x(y-2) = -y$, giving $x = \frac{y}{2-y}$ (provided $y \neq 2$). We need to check if this x is in domain A (not a positive integer). For most y, this x won't be a positive integer, but there are some values of y that map to positive integers, which should be excluded from the range. So f is not surjective to all of $\mathbb{R}$. The answer is D.

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Pakistan Affairs QUESTION #317

Question 14

In which country did Pakistan open its first embassy?

China
Afghanistan
Iran✔️
India

Correct Answer Logic:

Iran was the first country to recognize Pakistan and where Pakistan established its first diplomatic mission.

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Paper-II (Pharmacology and Social Behaviour, Law & Ethics and Computer Sciences) QUESTION #5807

Question 15

The 'Late Adopters' (Laggards) represent approximately what percentage of the population?

16%✔️
34%
2.5%
13.5%

Correct Answer Logic:

Laggards or late adopters make up 16%[cite: 7].

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General Knowledge QUESTION #2610

Question 16

Which of the following is NOT a characteristic of 'Open Source' software?

The source code is freely available to view and modify
Other developers can distribute the software for free
The software cannot be used by commercial organizations under any circumstances✔️
Developers can share and improve the software collaboratively

Correct Answer Logic:

Open source means developers will let other developers share, modify, and distribute software for free. However, open source software CAN be used by commercial organizations — many businesses use Linux and other open source tools commercially. The restriction on commercial use is NOT a defining feature of open source.

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Urdu QUESTION #5219

Question 17

'آم کے آم گھتلیوں کے دام' ضربِ مثل کا کیا مطلب ہے؟

دوہرا فائدہ✔️
نقصان
دوہرا نقصان
ان میں سے کوئی نہیں

Correct Answer Logic:

اس ضربِ مثل کا مطلب ہے ایک کام سے دو فائدے حاصل کرنا (تکرار ہے)۔

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General Knowledge QUESTION #266

Question 18

The book "The China-Pakistan Axis: Asia's New Geopolitics" was written by:

Stephen P. Cohen
Andrew Linklater
Andrew Small✔️
None of these

Correct Answer Logic:

Andrew Small is the author of this book focusing on the bilateral relationship.+1

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Math Physics Chemistry Biology QUESTION #523

Question 19

Syphilis is caused by

Neisseria gonorrhoeae
Cats worm
Treponema pallidum✔️
Herpes simplex

Correct Answer Logic:

Treponema pallidum causes syphilis

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Planning QUESTION #4979

Question 20

Which statistical test is most appropriate for determining correlation between household income and housing expenditure?

Chi-square test
T-test
Pearson correlation coefficient✔️
ANOVA

Correct Answer Logic:

Pearson correlation coefficient ($r$) measures linear relationship strength between two continuous variables (income and expenditure). Chi-square is for categorical data, t-test for mean differences, and ANOVA for comparing multiple groups.

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