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Basic Mathematics QUESTION #4496

Question 1581

Which of the following is a prime number?

$21$
$27$
$29$✔️
$33$

Correct Answer Logic:

$29$ has only two factors: $1$ and $29$. Others: $21 = 3 \times 7$, $27 = 3^3$, $33 = 3 \times 11$

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Chemistry QUESTION #1007

Question 1582

RBr undergoes Grignard reaction (Mg, dry ether) followed by hydrolysis ($\text{H}_2\text{O}$) to give 2-methylbutane. The maximum number of structural isomers of RBr that can produce 2-methylbutane is:

5
4✔️
3
1

Correct Answer Logic:

2-Methylbutane is $\text{CH}_3\text{CH(CH}_3\text{)CH}_2\text{CH}_3$. The Grignard reagent RMgBr reacts with water to give R–H. So R– must be a fragment of 2-methylbutane: 1-methylbutyl, 2-methylbutyl, 1-methyl-1-propyl, neopentyl, and isobutyl radicals. Counting distinct structural isomers of RBr gives 4.

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Statistics QUESTION #1996

Question 1583

The first three moments about $a = 16$ are $\mu_1' = -0.35$, $\mu_2' = 2.09$, $\mu_3' = -1.93$. The mean of the distribution is:

15.65✔️
16.35
16
15.35

Correct Answer Logic:

The mean $\bar{x} = a + \mu_1' = 16 + (-0.35) = 15.65$. The first raw moment about any arbitrary origin $a$ equals the deviation of the true mean from $a$, so adding $\mu_1'$ to $a$ recovers the mean.

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Basic Mathematics QUESTION #4558

Question 1584

What is $\frac{7}{10}$ as a percentage?

$7\%$
$0.7\%$
$70\%$✔️
$710\%$

Correct Answer Logic:

$\frac{7}{10} = 0.7 = 70\%$

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Biology QUESTION #4320

Question 1585

Which one of the following biomolecules is a polymer (polysaccharide)?

Sucrose
Pentose
Lactose
Glycogen✔️

Correct Answer Logic:

Glycogen is a polysaccharide (polymer of glucose) that serves as the main carbohydrate storage in animals. Sucrose and lactose are disaccharides; pentose is a monosaccharide.

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Biology QUESTION #575

Question 1586

In __________ zone the light is insufficient to support photosynthesis.

Desert
Profundal✔️
Littoral
All of these

Correct Answer Logic:

Profundal zone lacks sufficient light

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Professional QUESTION #1861

Question 1587

Appointment by transfer shall be made from amongst persons holding appointment on a regular basis in posts in which pay scales?

One scale lower
One scale higher
The same basic pay scale or equivalent/identical posts✔️
Any scale at discretion of authority

Correct Answer Logic:

Rule 9 states appointments by transfer shall be made from persons holding appointment on a regular basis in posts in the same basic pay scale or equivalent to or identical with the posts to be filled.

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Tourism & Hospitality Management QUESTION #1618

Question 1588

The Hospitality Operations course covers 'data mining for hotel firms' as part of financial control and information management. What is the primary purpose of data mining in this context?

To conduct geological surveys of hotel construction sites
To analyze large volumes of guest and operational data to identify patterns, preferences, booking behaviors, and revenue opportunities for strategic decision-making✔️
To mine cryptocurrency to fund hotel renovation projects
To digitize historical paper records of past guest transactions

Correct Answer Logic:

Module 8 of the Hospitality Operations course covers 'Data Mining for Hotel Firms' under Financial Control and Information Management. Data mining involves analyzing large operational and guest data sets to extract actionable patterns — such as booking trends, guest preferences, spending behavior, and peak demand cycles — to improve revenue management and personalize guest services.

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Statistics QUESTION #1966

Question 1589

The discrepancy between a computed sample statistic and the true population parameter is technically referred to as:

Sampling error✔️
Random error
Non-random error
Probability error

Correct Answer Logic:

Sampling error is the difference between a sample statistic and the true population parameter. It arises because only a subset of the population is observed.

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Library Sciences QUESTION #1518

Question 1590

A 'trade bibliography' such as Books in Print serves which primary function?

Listing all manuscripts held in national archives
Identifying and verifying books that are currently available for purchase✔️
Providing biographical data about authors
Indexing journal articles in a subject field

Correct Answer Logic:

Trade bibliographies like Books in Print list books currently available for purchase from publishers and booksellers. They are essential tools for acquisitions librarians, booksellers, and anyone verifying the commercial availability of a title.

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Mechanical Engineering QUESTION #2431

Question 1591

The Nusselt number $Nu = hL/k$ physically represents:

Temperature gradient at surface divided by overall temperature difference
The ratio of convective to conductive heat transfer across the fluid boundary layer✔️
The ratio of thermal to momentum boundary layer thickness
The ratio of inertial to viscous forces

Correct Answer Logic:

Nusselt number: $Nu=hL/k$, the ratio of convective heat transfer to conductive heat transfer across the fluid layer.

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Child Health QUESTION #3927

Question 1592

A 4-year-old child presents with a sudden onset of wheezing and coughing. On examination, the temperature is $37.5^\circ ext{C}$ and the respiratory rate is $30/ ext{min}$. There is dullness to percussion at the left lung base and localized wheezing. What is the most likely diagnosis?

Inhalation of a foreign body✔️
Acute bronchial asthma
Bacterial pneumonia
Congenital tracheomalacia

Correct Answer Logic:

No explanation provided for this question.

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Biology QUESTION #516

Question 1593

End product of hemoglobin break down is:

Creatinine
Bilirubin✔️
Hypoxanthin
Xanthin

Correct Answer Logic:

Hemoglobin breaks down to bilirubin

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Islamic Studies QUESTION #356

Question 1594

"Al-Farooq" (biography of Hazrat Umar) was written by:

Shah Waliullah
Sir Syed Ahmad Khan
Sulaiman Nadvi
Shibli Noumani✔️

Correct Answer Logic:

Shibli Noumani is the author of this famous Urdu biography.+1

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Architecture QUESTION #2356

Question 1595

In the Response Spectrum Method of seismic analysis for a multi-degree-of-freedom (MDOF) structure, which modal combination rule accounts for both the modal responses and the correlation between closely spaced modes?

SRSS (Square Root of Sum of Squares)
CQC (Complete Quadratic Combination)✔️
Absolute Sum (ABS)
SRSS with 10% rule

Correct Answer Logic:

The Complete Quadratic Combination (CQC) rule accounts for cross-correlation between modes, which is significant when modal frequencies are closely spaced (within 10% of each other). SRSS assumes all modes are uncorrelated (appropriate for well-separated modes). ABS is overly conservative. CQC reduces to SRSS when all modes are well-separated (correlation coefficients approach zero).

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General Knowledge QUESTION #2584

Question 1596

Which of the following BEST defines a computer?

A device used only to browse the internet and send emails
A device that stores and processes data by performing calculations✔️
A machine that only displays text and images on a screen
A tool used exclusively for storing documents and photos

Correct Answer Logic:

A computer is defined as a device that stores and processes data by performing calculations. It takes raw input data, processes it, and produces meaningful output — making it far more than just a browsing or display device.

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English QUESTION #2757

Question 1597

Which sentence uses the COMMA correctly?

I like apples✔️
oranges and
bananas.
I like apples oranges and bananas.

Correct Answer Logic:

oranges

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Urdu QUESTION #5260

Question 1598

فورٹ ولیم کالج کب بنا؟

1500
1600
1700
1800✔️

Correct Answer Logic:

فورٹ ولیم کالج کلکتہ میں 1800ء میں قائم ہوا جہاں اردو نثر کو بہت فروغ ملا۔

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Physics QUESTION #1032

Question 1599

In some units, time $t$ and position $x$ of a particle satisfy $t = x^2 + x$. The acceleration of the particle is:

$+\dfrac{2}{(x+1)^3}$
$+\dfrac{2}{2x+1}$
$-\dfrac{2}{(x+2)^3}$
$-\dfrac{2}{(2x+1)^3}$✔️

Correct Answer Logic:

$\frac{dt}{dx} = 2x+1\Rightarrow v = \frac{dx}{dt} = \frac{1}{2x+1}$. Acceleration: $a = \frac{dv}{dt} = \frac{dv}{dx}\cdot v = \frac{-2}{(2x+1)^2}\cdot\frac{1}{2x+1} = \frac{-2}{(2x+1)^3}$.

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Chemistry QUESTION #1426

Question 1600

The solubility of a gas in a liquid is directly proportional to the partial pressure of the gas above the liquid. This statement is based upon:

Raoult's law
Henry's law✔️
Kohlrausch's law
None of these

Correct Answer Logic:

Henry's Law states: $C = k_H \cdot P$, where $C$ is the concentration of dissolved gas, $P$ is the partial pressure of the gas above the liquid, and $k_H$ is Henry's law constant. Raoult's law relates vapour pressure of solutions; Kohlrausch's law relates molar conductivity of electrolytes at infinite dilution.

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