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Dipole moment depends on both bond polarity and molecular geometry. $\text{CO}_2$ is linear — two equal and opposite C=O bond dipoles cancel → $\mu = 0$. $\text{CCl}_4$ is tetrahedral — four C–Cl dipoles cancel → $\mu = 0$. $\text{H}_2\text{O}$ is bent (V-shaped) with bond angle ~104.5° — the two O–H bond dipoles do NOT cancel, giving a net dipole moment of $\mu \approx 1.85$ D, the highest among the options.

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Tourism & Hospitality Management QUESTION #1604

Question 4244

According to the Hospitality Operations course, which department is responsible for 'coordination with other departments, hotel engineering functions/duties, and security personnel duties'?

Food & Beverage Department
Front Office Department
Housekeeping, Engineering, and Security Department✔️
Sales and Marketing Department

Correct Answer Logic:

Module 6 of the Hospitality Operations course is specifically titled 'Operations: Housekeeping, Engineering and Security' and covers housekeeping organization and operations, coordination with other departments, hotel engineering functions/duties, engineering personnel, and the duties of security department and personnel.

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Paper-II (Pharmacognosy and Pharmaceutics-I) QUESTION #3618

Question 4245

'Ash Value' is a physical parameter used to detect:

The amount of active ingredient
The presence of inorganic earthy matter/impurities✔️
The moisture content
The volatile oil content

Correct Answer Logic:

Ash content indicates the mineral or earthy residue left after burning.

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MBBS QUESTION #10260

Question 4246

The filtration fraction is defined as $FF = \dfrac{GFR}{RPF}$ (glomerular filtration rate divided by renal plasma flow). Selective constriction of the efferent arteriole (as with low-dose ACE-inhibitor withdrawal or early diabetic nephropathy) typically produces which change?

Both GFR and RPF fall equally, so filtration fraction is unchanged
GFR rises (or is relatively preserved) while RPF falls due to increased downstream resistance, so filtration fraction increases✔️
Filtration fraction falls because GFR drops much more than RPF
Neither GFR nor RPF changes with efferent arteriolar tone

Correct Answer Logic:

Efferent arteriolar constriction raises glomerular capillary hydrostatic pressure, which tends to increase (or preserve) GFR, while simultaneously reducing downstream renal plasma flow — together raising the filtration fraction. This explains why ACE inhibitors, which dilate the efferent arteriole, can acutely reduce GFR in states of renal artery stenosis where efferent constriction was compensating for reduced perfusion.

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Biology Zoology Botany QUESTION #10771

Question 4247

Minerals required by the body in relatively large amounts are called:

Macrominerals✔️
Non-Essential minerals
Trace minerals
Microminerals

Correct Answer Logic:

Macrominerals (major minerals) are required in amounts greater than 100 mg/day. They include calcium (Ca), phosphorus (P), magnesium (Mg), sodium (Na), potassium (K), chloride (Cl), and sulfur (S). In contrast, trace minerals (microminerals) are needed in amounts less than 100 mg/day and include iron, zinc, copper, iodine, selenium, and manganese.

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English QUESTION #8540

Question 4248

The workman may seek indulgence _______ the Labour Court for his guaranteed rights.

Of
To
By
From✔️

Correct Answer Logic:

'Indulgence from' the court means permission or relief.

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Aptitude QUESTION #11031

Question 4249

Which 3D shape has exactly $5$ faces, $9$ edges, and $6$ vertices?

Triangular prism✔️
Square pyramid
Triangular bipyramid
Pentagonal pyramid

Correct Answer Logic:

A triangular prism has $5$ faces ($2$ triangles + $3$ rectangles), $9$ edges, and $6$ vertices. Using Euler's formula: $V - E + F = 6 - 9 + 5 = 2$.

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Molecular Biology / Bioinformatics / Biochemistry QUESTION #11064

Question 4250

Which air pollutant is responsible for the curling of leaves?

$\text{CO}$ (carbon monoxide)
$\text{O}_3$ (ozone)✔️
$\text{H}_2\text{S}$ (hydrogen sulphide)
$\text{SO}_2$ (sulphur dioxide)

Correct Answer Logic:

Ozone ($\text{O}_3$) causes characteristic leaf curling, chlorosis (yellowing), and necrosis in sensitive plant species. Ground-level ozone (a secondary pollutant formed from NOₓ and VOCs in sunlight) enters leaves through stomata and causes oxidative damage to cell membranes, disrupting photosynthesis. $\text{SO}_2$ causes bleaching and marginal necrosis; $\text{CO}$ has less direct phytotoxic effect; $\text{H}_2\text{S}$ causes stomatal closure.

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Physics QUESTION #7106

Question 4251

A wire has length $l_1$ at tension $T_1$ and $l_2$ at tension $T_2$. What is its natural length? [cite: 506, 507]

$\frac{T_1l_1 - T_2l_2}{T_2 - T_1}$
$\frac{l_1 + l_2}{2}$
$\frac{T_2l_1 + T_1l_2}{T_2 + T_1}$
$\frac{T_2l_1 - T_1l_2}{T_2 - T_1}$✔️

Correct Answer Logic:

Using $l = L + \frac{TL}{AY} = L + kT$:

$l_1 = L + kT_1$ and $l_2 = L + kT_2$ [cite: 506]
Solving for $L$ by eliminating $k$: $L = \frac{T_2l_1 - T_1l_2}{T_2 - T_1}$[cite: 515].

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Physics QUESTION #7307

Question 4252

A stone falls freely from rest. The distance covered in the last second of motion equals the distance covered in the first 3 seconds. How long does the stone take to reach the ground?

5 s✔️
12 s
15 s
3 s

Correct Answer Logic:

Distance in first 3 s: $s_3 = \dfrac{1}{2}(10)(3)^2 = 45\text{ m}$

Distance in last 1 s of total time $T$ (using $s_n = u + \dfrac{a}{2}(2n-1)$ with $u=0$):

$s_{\text{last}} = \dfrac{g}{2}(2T-1) = 5(2T-1)$

Setting equal: $5(2T-1) = 45 \Rightarrow 2T-1 = 9 \Rightarrow T = \mathbf{5\text{ s}}$

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Paper-I (Anatomy/Physiology and Biochemistry/Microbiology) QUESTION #3119

Question 4253

Hydrochloric Acid (HCl) is secreted by which cells in the stomach?

Chief cells
Parietal cells✔️
Mucous cells
G-cells

Correct Answer Logic:

Parietal cells secrete HCl and intrinsic factor (necessary for Vitamin $B_{12}$ absorption).

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Security Measures to Maintain Law and Order QUESTION #841

Question 4254

The concept of "Sterile Area" in airport security is maintained to:

Prevent germs
Ensure no prohibited items enter✔️
Facilitate VIPs
Increase revenue

Correct Answer Logic:

A sterile area is a portion of an airport where passengers have undergone security screening and have no access to unscreened items.

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Math Physics Chemistry Biology QUESTION #513

Question 4255

Which of the following receptors produce sensation of pain?

Mechanoreceptor
Nociceptors✔️
Chemoreceptors
Thermoreceptors

Correct Answer Logic:

Nociceptors detect pain

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Education QUESTION #6782

Question 4256

A test developer notices that one MCQ option is consistently longer and more qualified than the other three options, and it is also the correct answer. What test construction error has occurred and how should it be corrected?

The stem does not present a definite problem; rewrite the stem to be a direct question
The relative length of the correct answer provides an unintentional clue; revise distractors to be approximately equal in length to the correct answer by adding qualifying phrases✔️
There are too few distractors; add a fifth option
The item uses a negative stem; convert to a positive format

Correct Answer Logic:

Suggestion 8 in MCQ construction states: the relative length of alternatives should not provide a clue to the answer. Correct answers tend to require qualification to be unambiguously true, making them longer. The fix is to deliberately add similar qualifying phrases to the distractors to equalize length, removing the length clue while preserving plausibility.

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Law QUESTION #9529

Question 4257

A decree for possession of land is passed in favour of A. A dies before execution. A's son S, who is a Hindu undivided family co-parcener, seeks execution. B the judgment-debtor argues S must obtain probate or letters of administration before being recognised as A's representative. Is B's contention correct?

No; S can only execute the decree if he obtains a succession certificate
Yes; S must first obtain probate
Yes; execution requires a court certificate of inheritance
No; in the absence of a specific requirement, S can apply to the executing Court to be recognised as the legal representative of A under Section 50 CPC; the executing Court has jurisdiction to determine who constitutes the legal representative without requiring formal probate in every case✔️

Correct Answer Logic:

Section 50 CPC allows the executing Court to permit execution against the legal representative of a deceased decree-holder. 'Legal representative' is defined broadly under Section 2(11) to include any person who in law represents the estate. The executing Court can determine the question of legal representation without insisting on formal probate in every case.

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General Knowledge QUESTION #8635

Question 4258

Which language is spoken by the largest number of people in the world as a first language?

Chinese✔️
English
Arabic
French

Correct Answer Logic:

Mandarin Chinese has the most native speakers.

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Chemistry QUESTION #1084

Question 4259

Match List-I with List-II for types of solutions: (A) Humidity (B) Alloys (C) Amalgams (D) Smoke; with (I) Solid in solid (II) Liquid in gas (III) Solid in gas (IV) Liquid in solid

A-III, B-I, C-IV, D-II
A-III, B-II, C-I, D-IV
A-II, B-IV, C-I, D-III✔️
A-II, B-I, C-IV, D-III

Correct Answer Logic:

Humidity = water vapour (liquid) dissolved in air (gas) → Liquid in gas (II). Alloys = solid metals dissolved in solid → Solid in solid (I)... wait alloys can be solid in liquid or solid in solid. Mercury amalgams = solid/liquid metal dissolved in mercury (liquid) → Liquid in solid (IV)... Smoke = solid particles in gas → Solid in gas (III). Matching: A-II, B-I, C-IV, D-III.

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Chemistry QUESTION #5536

Question 4260

Which isotope of hydrogen emits low-energy $\beta^-$ particles?

Proton $H^+$
Tritium $^3_1H$✔️
Protium $^1_1H$
Deuterium $^2_1H$

Correct Answer Logic:

Tritium ($^3_1H$) is a radioactive isotope of hydrogen containing 1 proton and 2 neutrons. It undergoes beta decay: $^3_1H \to ^3_2He + \beta^- + \bar{\nu}_e$. The emitted $\beta^-$ particles have very low energy (~18 keV max). Protium and deuterium are stable; $H^+$ is simply a proton with no radioactivity.

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