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Physics QUESTION #7319

A stone dropped from height $h$ hits the ground with momentum $P$. If the same stone is dropped from height $2h$ (100% more), the momentum on hitting the ground changes by approximately:

200%
100%
68%
41%✔️

Correct Answer Logic:

$v = \sqrt{2gh}$, so $P = mv = m\sqrt{2gh}$

New momentum: $P' = m\sqrt{2g(2h)} = \sqrt{2}\,P$

Percentage change $= (\sqrt{2}-1)\times 100 \approx 0.414 \times 100 = \mathbf{41\%}$

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Chemistry QUESTION #7396

Question 2

The correct order of electronegativity for hybrid orbitals of carbon is:

$\text{sp} < \text{sp}^2 < \text{sp}^3$
$\text{sp} > \text{sp}^2 < \text{sp}^3$
$\text{sp} > \text{sp}^2 > \text{sp}^3$✔️
$\text{sp} < \text{sp}^2 > \text{sp}^3$

Correct Answer Logic:

Electronegativity of carbon hybrid orbitals:
Greater s-character → higher electronegativity (s-electrons are held closer to nucleus).

sp: 50% s-character
sp²: 33% s-character
sp³: 25% s-character

Therefore: sp > sp² > sp³ in electronegativity. This also explains why sp C–H bonds (alkynes) are more acidic than sp³ C–H bonds (alkanes).

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Math (Module-1) QUESTION #5474

Question 3

$\frac{\sqrt{x}}{\sqrt{y}} = \sqrt{w+19}$ relates positive real numbers $w, x, y$. Which equation correctly expresses $w$ in terms of $x$ and $y$?

$w = \frac{x}{y} - 19$
$w = \frac{28x}{14y} - 19$
$w = (\frac{x}{y})^2 - 19$
$w = (\frac{2x}{y})^2 - 19$✔️

Correct Answer Logic:

Squaring both sides of $\frac{2x}{y} = \sqrt{w+19}$ gives $w = (\frac{2x}{y})^2 - 19$.

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English QUESTION #8579

Question 4

What is the noun form of the verb 'excite'?

Exciting
excited
excitement✔️
excitement

Correct Answer Logic:

The noun is 'excitement' (option c, though both c and d look same).

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Professional QUESTION #1827

Question 5

Under Section 7(5), confirmation of a civil servant in a service or post takes effect from which date?

The date of issuance of the confirmation notification
The date of joining the post
The date of occurrence of permanent vacancy or the date of continuous officiation, whichever is LATER✔️
The date of recommendation by the selection authority

Correct Answer Logic:

Section 7(5) specifies that confirmation shall take effect from the date of occurrence of a permanent vacancy in the service or post, or from the date of continuous officiation in such service or post, whichever is later. Both conditions are considered, and the later date governs.

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Paper-I (Anatomy/Physiology and Biochemistry/Microbiology) QUESTION #3423

Question 6

'Beri-beri' is a disease caused by the deficiency of:

Vitamin B1 (Thiamine)✔️
Vitamin B2 (Riboflavin)
Vitamin B3 (Niacin)
Vitamin B12

Correct Answer Logic:

Common in populations relying heavily on polished rice.

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English QUESTION #8295

Question 7

He cannot stop you _______ coming here.

At
By
From✔️
To

Correct Answer Logic:

'Stop someone from doing something' is the correct pattern.

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Civil Procedure QUESTION #3687

Question 8

In a diversity action in federal court in State A, the court must decide which statute of limitations to apply. State A has a 2-year limit, while State B (where the accident occurred) has a 4-year limit. There is no Federal Rule of Civil Procedure governing the limitation period. Under the Erie doctrine, what should the court do?

Apply the federal common law 3-year limitation.
Apply State A's 2-year limit, because statutes of limitations are substantive for Erie purposes.✔️
Apply State B's 4-year limit, because the accident happened there.
Apply whichever limit is more favorable to the plaintiff to ensure access to justice.

Correct Answer Logic:

Under Guaranty Trust Co. v. York, statutes of limitations are outcome-determinative and therefore substantive for Erie purposes. A federal court sitting in diversity must apply the statute of limitations of the state in which it sits.

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Dairy Food Science and Technology QUESTION #5878

Question 9

Bactofugation removes bacteria from milk using:

Microfiltration membranes
High-speed centrifugation exploiting density difference between bacteria $(\rho \approx 1.1\;\text{g/mL})$ and milk $(\rho \approx 1.032\;\text{g/mL})$✔️
UV irradiation
Chemical bacteriostats

Correct Answer Logic:

Bactofugation uses centrifugal separators rotating at $\approx 20{,}000$ rpm. Bacteria $(\rho \approx 1.1\;\text{g/mL})$ are denser than milk $(\rho \approx 1.032\;\text{g/mL})$ and are sedimented as a concentrate, reducing spore count by up to $99\%$.

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Chemistry QUESTION #7822

Question 10

Which molecule has zero dipole moment?

BF₃✔️
NF₃
NH₃
H₂O

Correct Answer Logic:

BF₃ is trigonal planar with symmetric bond dipoles canceling (net μ=0). NF₃, NH₃, H₂O are polar.

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Paper-II (Pharmacognosy and Pharmaceutics-I) QUESTION #2979

Question 11

What is the main purpose of the 'International Pharmacopoeia' (Ph.Int.)?

To set laws for European pharmacy
To provide global standards for drug quality✔️
To list retail prices of drugs
To serve as a textbook for students

Correct Answer Logic:

The Ph.Int. is published by the WHO to provide international standards, especially for developing countries.

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Disaster Management QUESTION #6560

Question 12

Which principle should guide the design of climate-smart agricultural practices for disaster-affected communities?

Maximum yield
Integration of climate resilience, market viability, environmental sustainability, and adaptation to local agro-ecological conditions✔️
Traditional methods
Modern technology

Correct Answer Logic:

Section 10.2 promotes climate-smart agriculture as part of resilient livelihoods. Effective climate-smart agriculture must balance multiple objectives: resilience to climate variability, economic viability, environmental sustainability, and appropriateness to local conditions and farmer capacities.

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Islamic Studies QUESTION #234

Question 13

The basic obligatory action (Rukn) of Hajj is:

Sa'i
Rami
Wuqof-e-Arafah✔️
None of these

Correct Answer Logic:

Being present at the plain of Arafah is the essential core of the Hajj pilgrimage.

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General Knowledge QUESTION #8946

Question 14

Which city has the world's largest subway system (by annual ridership)?

Tokyo
Shanghai✔️
Mexico City
New York

Correct Answer Logic:

Tokyo Metro has the highest annual ridership.

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English QUESTION #8516

Question 15

The opposite of Confine is:

hide
capture
confirm
release✔️

Correct Answer Logic:

Confine means to restrict; opposite is release.

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Reading and Writing (Module-1) QUESTION #5376

Question 16

While researching a topic, a student has taken the following notes: In astronomy, the mass of stars can be described in units called solar masses. One solar mass is roughly equal to the mass of the Sun. The mass of the star Proxima Centauri is 0.122 solar masses. The mass of the star Sirius A is 2.063 solar masses. The student wants to emphasize the mass of Sirius A. Which choice most effectively uses relevant information from the notes to accomplish this goal?

The mass of stars, like Proxima Centauri, can be described in units called solar masses.
In astronomy, the mass of stars can be described in units called solar masses, and one solar mass is roughly equal to the mass of the Sun.
The Sun is more massive than Proxima Centauri, which has a mass of 0.122 solar masses.
With a mass of 2.063 solar masses, Sirius A is more massive than the Sun.✔️

Correct Answer Logic:

Option D focuses on the specific mass of Sirius A as the primary point of the sentence.

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Chemistry QUESTION #7414

Question 17

The acidity of diprotic acids in aqueous solution increases in the order:

$\text{H}_2\text{S} < \text{H}_2\text{Se} < \text{H}_2\text{Te}$✔️
$\text{H}_2\text{Se} < \text{H}_2\text{S} < \text{H}_2\text{Te}$
$\text{H}_2\text{Te} < \text{H}_2\text{S} < \text{H}_2\text{Se}$
$\text{H}_2\text{Se} < \text{H}_2\text{Te} < \text{H}_2\text{S}$

Correct Answer Logic:

Acid strength of hydrides (Group 16):
Down the group, bond length increases (H–X bond gets weaker), making it easier to release H⁺. Therefore acid strength increases down the group:

$\text{H}_2\text{O} < \text{H}_2\text{S} < \text{H}_2\text{Se} < \text{H}_2\text{Te}$

Note: This trend is opposite to electronegativity trend, and is governed by bond dissociation energy.

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General Knowledge QUESTION #8764

Question 18

What is the medical condition 'insomnia'?

Inability to sleep✔️
Colour blindness
Depression
None of the above

Correct Answer Logic:

Insomnia is difficulty sleeping.

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CISA QUESTION #6846

Question 19

An IS auditor discovers that security logs are generated but retained for only 7 days due to storage limitations. The organization's incident response procedures require 90 days of log data for investigation. What is the PRIMARY risk?

Inadequate storage capacity
Insufficient log retention prevents effective incident investigation and forensic analysis✔️
Excessive log volume
Complex log management

Correct Answer Logic:

The 83-day gap between log retention (7 days) and investigative requirements (90 days) means most incidents cannot be properly investigated. By the time incidents are detected and investigation begins, critical evidence has been deleted. This severely compromises security monitoring, incident response, and forensic capabilities.

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Chemistry QUESTION #7420

Question 20

Element with atomic number Z = 114 would belong to which group and have which electronic configuration?

Carbon family, [Rn] 5f¹⁴ 6d¹⁰ 7s² 7p²✔️
Oxygen family, [Rn] 5f¹⁴ 6d¹⁰ 7s² 7p⁴
Nitrogen family, [Rn] 5f¹⁴ 6d¹⁰ 7s² 7p⁶
Halogen family, [Rn] 5f¹⁴ 6d¹⁰ 7s² 7p⁵

Correct Answer Logic:

Finding the position of Z=114 (Flerovium, Fl):
After Rn (Z=86): fill 7s² (88), 5f¹⁴ (102), 6d¹⁰ (112), then 7p²...
Z=113: 7p¹ (Group 13), Z=114: 7p² (Group 14 = Carbon family)

Configuration: [Rn] 5f¹⁴ 6d¹⁰ 7s² 7p² ✓

Flerovium (Fl, Z=114) is in Group 14, Period 7, homologue of Pb.

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