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Chemistry QUESTION #1087

Total number of possible isomers (both structural and stereoisomers) of cyclic ethers of molecular formula $\text{C}_4\text{H}_8\text{O}$ is:

10✔️
11
6
8

Correct Answer Logic:

Cyclic ethers with formula C$_4$H$_8$O: (1) Oxetane ring with methyl substituents, (2) Tetrahydrofuran (THF) — 1 structure, (3) Oxetane + methyl: 2-methyloxetane (2 enantiomers), 3-methyloxetane (1), (4) Oxirane + ethyl/dimethyl: 2-ethyloxirane (2 enantiomers), 2,2-dimethyloxirane (1), 2,3-dimethyloxirane (cis+trans = 3). Total = 1+2+1+2+1+3 = 10.

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General Knowledge QUESTION #2605

Question 2422

When you use a mobile banking app without understanding the complex banking software and servers behind it, which computing concept are you directly experiencing?

Cryptography
Binary System
Abstraction✔️
Logic Gates

Correct Answer Logic:

Abstraction means taking a relatively complex system and simplifying it for our use. A mobile banking app abstracts away all the complexity of banking servers, databases, and security protocols, presenting you with a simple, usable interface.

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Physics QUESTION #4408

Question 2423

The curved shape of an airplane wing causes air to move faster over the top surface. This leads to:

Greater pressure on the top
Lower pressure on the top✔️
Equal pressure on both sides
Zero pressure above the wing

Correct Answer Logic:

By Bernoulli's principle, faster-moving air exerts lower pressure. Air moves faster over the curved upper surface of the wing, creating lower pressure above and higher pressure below, generating lift ($\Delta P = \frac{1}{2}\rho v^2$).

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Electrical Engineering QUESTION #2150

Question 2424

A $50\text{ kVA}$ transformer has a copper loss of $800\text{ W}$ at full load. What will be the copper loss at half load?

$400\text{ W}$
$200\text{ W}$✔️
$100\text{ W}$
$600\text{ W}$

Correct Answer Logic:

Copper loss varies as the square of the load ($P_{cu} \propto I^2$). At half load, the loss is $(\frac{1}{2})^2 \times 800\text{ W} = \frac{1}{4} \times 800\text{ W} = 200\text{ W}$.

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Islamic Studies QUESTION #328

Question 2425

A Hadith which is directly narrated by a Tabi (Successor) is called:

Marfoo
Maqtoo
Muquf
Mursal✔️

Correct Answer Logic:

A Mursal Hadith is one where a Successor narrates directly from the Prophet (ﷺ) omitting the Companion.

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English Literature QUESTION #663

Question 2426

"Why I Am Not a Christian" is an essay by:

Bertrand Russell✔️
T. S. Eliot
Ralph Waldo Emerson
George Orwell

Correct Answer Logic:

This influential essay was based on a talk given by Russell in 1927.

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Maths QUESTION #7981

Question 2427

$3.29 \times 1000$ equals:

329
32.9
329
3290✔️

Correct Answer Logic:

$3.29 \times 1000 = 3290$ (move decimal point 3 places to the right)

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English Literature QUESTION #716

Question 2428

Hester Prynne's daughter in "The Scarlet Letter" is named:

Ruth
Pearl✔️
Mary
Sarah

Correct Answer Logic:

Pearl is the living embodiment of the scarlet letter, a constant reminder of Hester's sin and her spirit.

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Aptitude QUESTION #10915

Question 2429

A cube is painted red on all six faces and then cut into 64 smaller equal cubes. How many small cubes have paint on exactly two faces?

24✔️
16
8
12

Correct Answer Logic:

When a cube is cut into $4 \times 4 \times 4 = 64$ smaller cubes:

Cubes with 3 painted faces: Only corner cubes = 8
Cubes with 2 painted faces: Edge cubes (not corners). Each edge has $4 - 2 = 2$ such cubes. A cube has 12 edges. So = $12 \times 2 = 24$
Cubes with 1 painted face: Face cubes (not on edges). Each face has $2 \times 2 = 4$ such cubes. 6 faces = $6 \times 4 = 24$
Cubes with 0 painted faces: Inner cubes = $2 \times 2 \times 2 = 8$

Answer: 24 cubes have paint on exactly two faces.

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CISA QUESTION #1744

Question 2430

The Software Engineering Institute's Capability Maturity Model (CMM) is most accurately described as which of the following?

A measure of resources needed to reduce coding defects
A record of achievements made during program development
A comparison of application performance against user requirements
A reference point for tracking current process progress or regression✔️

Correct Answer Logic:

The CMM serves as a baseline reference to chart current progress or regression in process maturity. It provides a structured guideline for improving the maturity of systems and management procedures, starting from no defined process and advancing through five levels of documentation and controls.

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Psychology QUESTION #9844

Question 2431

In the perception of people, feedback will primarily serve to:

Correct an inaccurate initial perception
Confirm an accurate initial perception
Stabilize an inaccurate initial perception
Any of the above would be true✔️

Correct Answer Logic:

Feedback in person perception can serve any of these functions depending on context: correcting mistaken impressions, confirming accurate ones, or paradoxically stabilizing inaccurate ones through confirmation bias. All three outcomes are documented.

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Physics QUESTION #1050

Question 2432

A balloon of surface tension $S$, outlet area $A$, gas density $\rho$, radius $R$. Gas flows out: radius changes from $R$ to 0 in time $T$. Speed $v(r)\propto r^a$ and $T\propto S^\alpha A^\beta \rho^\gamma R^\delta$. Then:

$a=-\frac{1}{2},\alpha=-\frac{1}{2},\beta=-1,\gamma=\frac{1}{2},\delta=\frac{7}{2}$✔️
$a=\frac{1}{2},\alpha=\frac{1}{2},\beta=-\frac{1}{2},\gamma=\frac{1}{2},\delta=\frac{7}{2}$
$a=\frac{1}{2},\alpha=\frac{1}{2},\beta=-1,\gamma=+1,\delta=\frac{3}{2}$
$a=-\frac{1}{2},\alpha=-\frac{1}{2},\beta=-1,\gamma=-\frac{1}{2},\delta=\frac{5}{2}$

Correct Answer Logic:

Pressure inside balloon $=\frac{4S}{r}$. By Bernoulli: $\frac{4S}{r}=\frac{1}{2}\rho v^2\Rightarrow v=\sqrt{\frac{8S}{\rho r}}\propto r^{-1/2}$. So $a=-\frac{1}{2}$. For time: $T\propto \frac{R}{v(R)}\cdot f(geometry)$. Dimensional analysis of $T\propto S^\alpha A^\beta\rho^\gamma R^\delta$ with $[T]=s$ gives $\alpha=-1/2, \beta=-1, \gamma=1/2, \delta=7/2$.

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Education QUESTION #6892

Question 2433

A teacher instructs students that when they finish work early, they should refer to a classroom chart of extension activities. According to classroom management principles, what specific management problem does this strategy MOST directly prevent?

Students finishing early from copying peers' work
Unstructured 'free time' that creates behavioral disruption during natural lesson gaps✔️
Students becoming overloaded with work beyond their cognitive level
Inequity in the distribution of academic tasks across ability levels

Correct Answer Logic:

When students finish early and have nothing structured to do, they fill that 'free time' with self-chosen — often disruptive — behavior. Providing extension activity charts ensures that every student has a purposeful, curriculum-connected task at all times, preventing the behavioral vacuum that unstructured time creates.

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Islamic Studies QUESTION #7910

Question 2434

The second battle fought between Muslims of Medina and Quraish of Makkah was:

Badr
Uhud✔️
Khandak
Khyber

Correct Answer Logic:

The second battle was the Battle of Uhud fought in 3 AH (625 CE). It occurred after the Battle of Badr and before the Battle of Khandak. Although Muslims initially gained the upper hand, the battle ended inconclusively after some archers disobeyed orders and left their positions.

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MBBS QUESTION #10363

Question 2435

Lesch-Nyhan syndrome, characterized by hyperuricemia, self-mutilating behavior, and choreoathetosis, results from deficiency of which purine salvage pathway enzyme?

Hypoxanthine-guanine phosphoribosyltransferase (HGPRT)✔️
Adenosine deaminase
Xanthine oxidase
Adenine phosphoribosyltransferase (APRT)

Correct Answer Logic:

HGPRT deficiency prevents salvage (recycling) of hypoxanthine and guanine back into nucleotides, forcing these purine bases toward degradation to uric acid (causing severe hyperuricemia/gout) while simultaneously depriving cells, particularly in the basal ganglia, of adequate purine nucleotide salvage — contributing to the characteristic neurobehavioral features including self-injurious behavior.

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English QUESTION #2764

Question 2436

Find the word OPPOSITE IN MEANING to 'Courageous'.

Brave
Bold
Fearless
Cowardly✔️

Correct Answer Logic:

'Courageous' means having or showing bravery. Its antonym (opposite) is 'Cowardly', which means lacking courage. The other options (Brave, Bold, Fearless) are synonyms.

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Biology QUESTION #7286

Question 2437

One of the free-living, anaerobic nitrogen-fixers is:

Azotobacter
Beijerinckia
Rhodospirillum✔️
Rhizobium

Correct Answer Logic:

Rhodospirillum is a free-living, anaerobic, photosynthetic nitrogen-fixer (purple non-sulfur bacterium). Azotobacter and Beijerinckia are free-living but aerobic nitrogen-fixers. Rhizobium is symbiotic (lives in legume root nodules). Rhodospirillum fixes nitrogen under anaerobic conditions using light energy.

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Physics QUESTION #7338

Question 2438

A missile is fired for maximum range with initial velocity $20\text{ m/s}$ ($g = 10\text{ m/s}^2$). The range of the missile is:

40 m✔️
50 m
60 m
20 m

Correct Answer Logic:

Maximum range occurs at $\theta = 45°$:

$R_{\max} = \dfrac{u^2}{g} = \dfrac{(20)^2}{10} = \mathbf{40\text{ m}}$

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Mathematics QUESTION #7469

Question 2439

For any $\theta \in (\frac{\pi}{4}, \frac{\pi}{2})$, the expression $3(\sin\theta - \cos\theta)^4 + 6(\sin\theta + \cos\theta)^2 + 4\sin^6\theta$ equals:

13 - 4cos²θ + 6sin²θcos²θ✔️
13 - 4cos⁶θ
13 - 4cos²θ + 6cos⁴θ
13 - 4cos⁴θ + 2sin²θcos²θ

Correct Answer Logic:

Expanding each term: $(\sin\theta-\cos\theta)^4 = \sin^4\theta - 4\sin^3\theta\cos\theta + 6\sin^2\theta\cos^2\theta - 4\sin\theta\cos^3\theta + \cos^4\theta$, $(\sin\theta+\cos\theta)^2 = \sin^2\theta + 2\sin\theta\cos\theta + \cos^2\theta = 1 + 2\sin\theta\cos\theta$. Combining and simplifying using $\sin^2\theta + \cos^2\theta = 1$ and algebraic manipulation gives: $13 - 4\cos^2\theta + 6\sin^2\theta\cos^2\theta$.

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Law QUESTION #9485

Question 2440

A plaintiff A files a suit for recovery. After framing of issues, both parties agree orally before the Court that A will withdraw the suit and that no future suit on the same cause of action shall be filed. The Court records this and dismisses the suit accordingly. Three years later A files a fresh suit on the same cause of action. B raises the bar. Is the second suit maintainable?

No; the second suit requires leave of the Court
Yes; an oral agreement cannot bar a future suit
Yes; res judicata does not apply since there was no adjudication on merits
No; where a party is precluded by rules from instituting a further suit in respect of the same cause of action, Section 12 bars the second suit✔️

Correct Answer Logic:

Section 12(1) CPC provides that where a plaintiff is precluded by rules from instituting a further suit in respect of any particular cause of action, no such suit shall lie. Order XXIII Rule 1 CPC provides that where a plaintiff withdraws a suit without leave to file a fresh suit, he is precluded from filing again on the same cause of action. The recorded agreement creates such preclusion.

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