Reading Mode - Questions

In the extended Bernoulli equation: $H_A$ is the head added by a pump, $H_L$ is the head loss due to friction, and $H_E$ is the head extracted by a turbine.

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Chemistry QUESTION #1423

Question 4

In solvent extraction, the distribution coefficient is:

Ratio of solute concentration in two phases✔️
Ratio of solvents used
Ratio of extractant to sample volume
None of these

Correct Answer Logic:

The distribution coefficient (partition coefficient) $K_D$ in solvent extraction is defined as: $K_D = \dfrac{[\text{solute}]_{\text{organic}}}{[\text{solute}]_{\text{aqueous}}}$ — the ratio of the concentration of solute in the organic (extracting) phase to its concentration in the aqueous phase at equilibrium. A high $K_D$ means preferential distribution into the organic phase.

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Basic Mathematics QUESTION #2901

Question 5

If $10$ men can do a job in $12$ days, how many days will $15$ men take?

8 days✔️
10 days
15 days
18 days

Correct Answer Logic:

Use $M_1D_1 = M_2D_2$. $10 \times 12 = 15 \times D_2 \implies 120 = 15D_2 \implies D_2 = 8$.

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General Knowledge QUESTION #2613

Question 6

What is the PRIMARY function of a CPU (Central Processing Unit)?

To store large amounts of data permanently like photos and documents
To convert electricity from the wall outlet into usable computer power
To process instructions and perform calculations that run programs and applications✔️
To connect peripheral devices like keyboards and mice to the computer

Correct Answer Logic:

The CPU (Central Processing Unit) is the brain of the computer. It processes instructions and performs calculations. Every action you take on a computer — opening a file, typing text — involves the CPU executing instructions.

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Basic Mathematics QUESTION #4589

Question 7

Two numbers are in ratio $7:9$. If their sum is $64$, what is the larger number?

$28$
$36$✔️
$32$
$56$

Correct Answer Logic:

Total parts = $7+9=16$. Larger = $\frac{9}{16} \times 64 = 36$

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Physics QUESTION #1028

Question 8

Three identical heat conducting rods in series: outer rods have conductivity $2K$, middle rod has conductivity $K$. Left end at $3T$, right end at $T$. The ratio $T_1/T_2$ (left junction to right junction temperature) is:

$\dfrac{5}{3}$✔️
$\dfrac{5}{4}$
$\dfrac{3}{2}$
$\dfrac{4}{3}$

Correct Answer Logic:

In steady state, heat flow rate $Q$ is same through all rods. Let each rod have length $L$ and area $A$. $\frac{2KA(3T-T_1)}{L} = \frac{KA(T_1-T_2)}{L} = \frac{2KA(T_2-T)}{L}$. From 1st and 3rd: $2(3T-T_1)=2(T_2-T)\Rightarrow 3T-T_1=T_2-T\Rightarrow T_1+T_2=4T$. From 1st and 2nd: $2(3T-T_1)=T_1-T_2\Rightarrow 6T-2T_1=T_1-T_2\Rightarrow 3T_1-T_2=6T$. Solving: $T_1=\frac{5T}{2}, T_2=\frac{3T}{2}$. Ratio $=\frac{5/2}{3/2}=\frac{5}{3}$.

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Reading and Writing (Module-1) QUESTION #5326

Question 9

What is the main idea of the text regarding niche partitioning?

It reduces competition by ensuring species occupy different roles.✔️
It leads to the extinction of weaker species.
It prevents species from sharing the same ecosystem.
It increases the amount of resources available.

Correct Answer Logic:

Niche partitioning allows species to coexist by specializing in different areas/roles.

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Urdu QUESTION #5028

Question 10

محاورے کے لیے کم از کم کتنے الفاظ کا ہونا ضروری ہے؟

دو✔️
ایک
تین
ان میں سے کوئی نہیں

Correct Answer Logic:

محاورہ کم از کم دو الفاظ پر مشتمل ہوتا ہے جو مل کر ایک خاص معنی دیتے ہیں۔

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Federal Rules of Evidence (US) QUESTION #3783

Question 11

A defendant is charged with embezzlement. He calls a character witness to testify that the defendant has a reputation in the community for being 'an honest and law-abiding man.' The prosecution seeks to cross-examine this witness by asking, 'Are you aware that the defendant was fired from his last job for stealing from the cash register?' Is this question allowed?

No, because specific instances of conduct are generally inadmissible under Rule 405.
Yes, because the prosecution can use specific instances of conduct to test a character witness's knowledge on cross-examination.✔️
No, unless the prosecution has a certified copy of a conviction for that theft.
Yes, but the prosecution must prove the theft by extrinsic evidence if the witness denies knowing about it.

Correct Answer Logic:

Rule 405(a) allows the prosecution to inquire into relevant specific instances of the person's conduct during cross-examination of a character witness to test the witness's credibility and the basis for their opinion/reputation testimony.

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Chemistry QUESTION #4339

Question 12

Which one shows anisotropic behavior?

Wood
Gemstone
Coke
Graphite✔️

Correct Answer Logic:

Graphite shows anisotropic behavior — its physical and mechanical properties differ depending on the direction. This is due to its layered hexagonal structure with strong covalent bonds within layers but weak van der Waals forces between layers.

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Professional QUESTION #1809

Question 13

According to Rule 19(3), the Authority is required to evaluate and decide upon a blacklisting review petition within how many days of its filing?

Thirty days
Sixty days
Ninety days✔️
One hundred and twenty days

Correct Answer Logic:

Rule 19(3) stipulates that once a review petition against blacklisting or debarment is filed before the Authority, the Authority shall evaluate the case and render its decision within ninety days of filing. The decision of the Authority is considered final.

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Tourism & Hospitality Management QUESTION #1642

Question 14

In the Accounting and Finance for Tourism & Hospitality course, the 'accounting equation' forms the foundation of all financial statements. Which equation correctly represents this fundamental accounting principle?

Revenue − Expenses = Net Profit
Assets = Liabilities + Owner's Equity✔️
Cash Inflows − Cash Outflows = Net Cash Flow
Gross Profit − Operating Expenses = EBITDA

Correct Answer Logic:

The Accounting and Finance course (Module 2: Basics of Accounting) identifies the Accounting Equation — Assets = Liabilities + Owner's Equity — as the foundational principle underlying the Balance Sheet (Statement of Financial Position). Every business transaction maintains this equation in balance, forming the basis of double-entry bookkeeping and financial reporting.

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Child Health QUESTION #3927

Question 15

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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Mathematics QUESTION #1307

Question 16

The D'Alembert solution of the wave equation $u_{xx}=\dfrac{1}{c^2}u_{tt}$ with $u(x,0)=f(x)$ and $u_t(x,0)=g(x)$ is:

$u(x,t)=\dfrac{f(x+ct)+f(x-ct)}{2}+\dfrac{1}{2c}\int_{x-ct}^{x+ct}g(s)\,ds$✔️
$u(x,t)=f(x+ct)+f(x-ct)$
$u(x,t)=\dfrac{f(x+ct)-f(x-ct)}{2}+\dfrac{1}{c}\int_0^x g(s)\,ds$
$u(x,t)=f(x)g(t)$

Correct Answer Logic:

D'Alembert's formula gives the general solution of the 1D wave equation: $u(x,t)=\dfrac{f(x+ct)+f(x-ct)}{2}+\dfrac{1}{2c}\int_{x-ct}^{x+ct}g(s)\,ds$. It represents two travelling waves moving in opposite directions.

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Therapeutics and Patient Care QUESTION #3890

Question 17

Which medication among those listed would require the least dose modification in a patient with significantly reduced kidney function?

Haloperidol✔️
Metformin
Digoxin
Tobramycin

Correct Answer Logic:

Haloperidol is predominantly hepatically metabolised and minimally renally excreted, making dose adjustment for renal impairment the least critical of the options listed.

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