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Boilers Mechanical Engineering QUESTION #2540

The parallel-axis (Steiner) theorem gives the second moment of area about an axis parallel to the centroidal axis as:

$I=\bar{I}-Ad^2$
$I=\bar{I}\cdot d^2$
$I=\bar{I}+Ad^2$✔️
$I=\frac{\bar{I}}{Ad^2}$

Correct Answer Logic:

Steiner's theorem: $I=\bar{I}+Ad^2$, where $\bar{I}$ is the centroidal second moment, $A$ is the area, and $d$ is the perpendicular distance between the axes. The second moment always increases for axes away from the centroid.

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HR and Management QUESTION #6466

Question 1602

The text's emphasis on 'most of these elements will affect you at some point in your career' suggests HRM knowledge is:

Only relevant for HR specialists
Universally applicable to all professionals✔️
Required only for senior executives
Optional for technical professionals

Correct Answer Logic:

HRM knowledge is universally applicable - whether you work in HRM or not, whether you work with organizations or have people working for you, you will be dealing with people and affected by HR practices. It's essential knowledge for all professionals.

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Islamic Studies QUESTION #330

Question 1603

What was the original name of the host of the Prophet (ﷺ), Abu Ayub Ansari (RA)?

Zaid bin Thabit
Khalid bin Zaid✔️
Qais bin Saad
Hanzla bin Aamir

Correct Answer Logic:

His original name was Khalid bin Zaid bin Kulayb.

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MCQs Section QUESTION #4850

Question 1604

Choose the word nearly similar in meaning to "CAJUN"

French-Canadian descendant✔️
American Indian
Native of the Everglades
Early inhabitant of the Bahama Islands

Correct Answer Logic:

Cajun refers to a member of a group of people in Louisiana descended from French-speaking Acadian immigrants who were expelled from Canada in the 18th century.

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Math (Module-1) QUESTION #5384

Question 1605

A certain function $f$ is defined by $f(x) = 14 + 11x$. What is the value of $f(x)$ when $x = 2$?

$14$
$25$
$36$✔️
$39$

Correct Answer Logic:

Substitute $x = 2$ into the function: $f(2) = 14 + 11(2) = 14 + 22 = 36$.

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Chemistry QUESTION #4352

Question 1606

Majority of reactions taking place at ordinary temperatures with $-\Delta H$ are:

Endothermic
Exothermic✔️
Thermally unstable
Reversible

Correct Answer Logic:

Reactions with $-\Delta H$ (negative enthalpy change) release heat to the surroundings and are exothermic. Most spontaneous reactions at ordinary temperature are exothermic.

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Paper-I (Anatomy/Physiology and Biochemistry/Microbiology) QUESTION #3502

Question 1607

'Catechu' (Katha) is primarily used in medicine as a/an:

Astringent✔️
Antibiotic
Vitamin
Hormone

Correct Answer Logic:

Astringents cause contraction of tissues and are used for diarrhea and skin ulcers.

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Physics QUESTION #1033

Question 1608

A model states flux through electron orbit in magnetic field $B$ is $n(h/e)$. The magnetic moment in the lowest energy state ($n=1$) is:

$\dfrac{heB}{\pi m}$
$\dfrac{heB}{2\pi m}$✔️
$\dfrac{he}{\pi m}$
$\dfrac{he}{2\pi m}$

Correct Answer Logic:

Flux: $B\pi r^2 = \frac{nh}{e}\Rightarrow r^2 = \frac{nh}{\pi eB}$. For $n=1$: $r=\sqrt{\frac{h}{\pi eB}}$. $mv^2/r = evB\Rightarrow v = \frac{eBr}{m}$. Magnetic moment $\mu = iA = \frac{ev}{2\pi r}\cdot\pi r^2 = \frac{evr}{2} = \frac{e}{2}\cdot\frac{eBr^2}{m} = \frac{e^2Bh}{2\pi em} = \frac{heB}{2\pi m}$.

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Boilers Mechanical Engineering QUESTION #2542

Question 1609

For a block of weight $W$ on a horizontal surface with $\mu_s=0.35$, the minimum horizontal force to initiate sliding is:

$P_{\min}=0.35\,W$✔️
$P_{\min}=W/0.35$
$P_{\min}=0.35\,W^2$
Cannot be determined without contact area

Correct Answer Logic:

At impending slip, friction reaches its limit: $F_{\max}=\mu_s N=\mu_s W=0.35W$. Hence the applied force must equal $P=0.35W$. Note that friction force is independent of contact area (Amontons' law).

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General Knowledge QUESTION #4485

Question 1610

_____ will co-host the next COP-31.

Indonesia and Turkey
Australia and Turkey✔️
Turkey and Thailand
None of these

Correct Answer Logic:

COP31 is planned to be jointly hosted by Australia and Turkey.

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General Knowledge QUESTION #9006

Question 1611

The ability to know the thoughts of others without communication is called:

Telepathy✔️
Psychology
Telecommunication
Psychiatry

Correct Answer Logic:

Telepathy is the supposed ability to read minds.

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Dairy Food Science and Technology QUESTION #5909

Question 1612

Detection of starch adulteration in milk involves adding iodine solution. A positive test gives:

A red/pink coloration due to casein-iodine complex
A deep blue-black coloration due to amylose-$\text{I}_2$ complex formation✔️
A yellow precipitate due to starch hydrolysis
No color change; starch is detected by microscopy only

Correct Answer Logic:

Iodine solution (Lugol's iodine or dilute $\text{I}_2/\text{KI}$) reacts with the helical structure of amylose to form an amylose-iodine inclusion complex producing an intense blue-black color. This is a qualitative test for starch adulteration in milk.

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General Knowledge QUESTION #4743

Question 1613

Hugo Chávez was the President of which country?

Venezuela✔️
Brazil
Bolivia
Cuba

Correct Answer Logic:

Hugo Chávez served as President of Venezuela from 1999 until his death in 2013. He was known for his socialist Bolivarian Revolution policies.

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General Knowledge QUESTION #8812

Question 1614

Which glands in the human body secrete tears?

Pituitary glands
Adrenal glands
Lachrymal glands✔️
Salivary glands

Correct Answer Logic:

Lachrymal glands produce tears.

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Pakistan Affairs QUESTION #595

Question 1615

Quaid-i-Azam M. A. Jinnah breathed his last in:

Quetta
Lahore
Karachi✔️
None of These

Correct Answer Logic:

The Quaid passed away in Karachi on September 11, 1948.

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Physics QUESTION #999

Question 1616

The maximum percentage error in the measurement of density of a wire is: [mass $= (0.60\pm0.003)\ \text{g}$, radius $= (0.50\pm0.01)\ \text{cm}$, length $= (10.00\pm0.05)\ \text{cm}$]

8
5✔️
4
7

Correct Answer Logic:

Density $\rho = \frac{m}{\pi r^2 l}$. $\frac{\Delta\rho}{\rho} = \frac{\Delta m}{m} + 2\frac{\Delta r}{r} + \frac{\Delta l}{l} = \frac{0.003}{0.60}+2\times\frac{0.01}{0.50}+\frac{0.05}{10.00} = 0.005+0.04+0.005 = 0.05 = 5\%$.

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Math Physics Chemistry Biology QUESTION #4278

Question 1617

The neurotransmitters are secreted by the neuron from:

Axon ends✔️
Dendrite end
Nissl's granules
Cell body

Correct Answer Logic:

Neurotransmitters are stored in synaptic vesicles at the axon terminals (synaptic knobs) and released into the synaptic cleft upon stimulation.

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Geography QUESTION #6298

Question 1618

Which sequence correctly represents the decreasing order of salinity in world ocean regions?

Red Sea > Mediterranean Sea > Persian Gulf > Atlantic Ocean
Persian Gulf > Red Sea > Mediterranean Sea > Pacific Ocean✔️
Mediterranean Sea > Red Sea > Atlantic Ocean > Indian Ocean
Red Sea > Persian Gulf > Mediterranean Sea > Indian Ocean

Correct Answer Logic:

The Persian Gulf has the highest salinity (~40 ppt) due to extreme evaporation and restricted circulation, followed by the Red Sea (~40 ppt), Mediterranean Sea (~38 ppt), and Pacific Ocean (~34 ppt). High evaporation rates and limited freshwater input drive these variations.

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Biology Zoology Botany QUESTION #1376

Question 1619

Which of the following is the dominant generation in the life cycle of Pteridophytes?

Sporophyte✔️
Gametophyte
Seedling
Embryo

Correct Answer Logic:

In pteridophytes (ferns and allies), the sporophyte generation (diploid, 2n) is the dominant, independent, and conspicuous phase — the familiar leafy fern plant. The gametophyte (haploid, n) is a small, inconspicuous, short-lived prothallus. This contrasts with bryophytes where the gametophyte is dominant, and represents an evolutionary advancement.

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Dairy Food Science and Technology QUESTION #5870

Question 1620

In the Babcock test for fat determination, the acid used to digest protein and release fat is:

Acetic acid
Sulfuric acid $(\text{H}_2\text{SO}_4)$✔️
Hydrochloric acid
Nitric acid

Correct Answer Logic:

Concentrated $\text{H}_2\text{SO}_4$ is used in the Babcock test. It digests casein and other proteins, generates heat, and releases fat so it can be measured volumetrically in the Babcock bottle neck.

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