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They are placed in the f-block of the periodic table. Note: Actinoids (Z = 90 to 103) are in the 7th period and fill the 5f sublevel — a common source of confusion.

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Chemistry QUESTION #7814

Question 2126

The efficiency of a chemical reaction is determined by calculating:

Actual yield
Theoretical yield
Percentage yield✔️
Amount of unused reactant

Correct Answer Logic:

Percentage yield = (actual yield/theoretical yield)×100, directly shows reaction efficiency.

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Disaster Management QUESTION #6525

Question 2127

In implementing the National Common Operating Picture (NCOP), what represents its most transformative capability?

Storing historical disaster data
Integrating multi-layered socio-economic, risk, and real-time hazard data for impact-based forecasting✔️
Creating visualization dashboards
Replacing provincial data systems

Correct Answer Logic:

Section 5.2 describes NCOP as integrating automated hazard information, infrastructure data, and socio-economic layers for impact-based forecasting. This integrated, predictive capability transforms disaster management from reactive response to proactive, data-driven anticipatory action.

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Information Technology QUESTION #1129

Question 2128

Which technique works by selecting the local optimal choice at each step?

Dynamic Programming
Divide and Conquer
Greedy Algorithm✔️
None of these

Correct Answer Logic:

A Greedy Algorithm makes the choice that looks best at the current moment with the hope that these local optimal choices will lead to a global optimum.

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Boilers Mechanical Engineering QUESTION #4003

Question 2129

A 'Hydraulic Test' (Hydrotest) of a boiler is usually conducted at:

Half the working pressure
The exact working pressure
$1.5$ times the design pressure✔️
$10$ times the working pressure

Correct Answer Logic:

This test uses water to check for leaks and structural integrity at pressures higher than normal operation.

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Chemistry QUESTION #7793

Question 2130

The standard hydrogen electrode (SHE) is assigned a potential of:

-1 V
0 V✔️
1 V
2 V

Correct Answer Logic:

By convention, SHE potential is defined as 0 V at all temperatures, with H⁺ (1 M) | H₂ (1 atm) | Pt.

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Ability / HR / Governance / Special Education QUESTION #1809

Question 2131

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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Constitutional Law QUESTION #5828

Question 2132

A city owns a public park. It allows various groups to hold rallies in the park but denies a permit to a group that wants to hold a rally 'celebrating the history of the Confederacy,' claiming it will cause public unrest. Is the denial constitutional?

Yes, because the city has a compelling interest in maintaining public order.
Yes, because the Confederacy is associated with unprotected 'hate speech.'
No, because the park is a 'public forum' and the denial is based on the content of the speech.✔️
No, because the city has not shown that a 'clear and present danger' exists.

Correct Answer Logic:

Parks are 'traditional public forums.' Regulations in these forums must be content-neutral (Time, Place, and Manner). If a regulation is content-based (denying a permit because of the 'topic'), it must survive strict scrutiny, and 'public unrest' or 'offense' is generally not a sufficient compelling interest.

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General Knowledge QUESTION #172

Question 2133

The British constitution can be amended through a _______ majority.

Two-Third
Three-Fourth
One-Two
None of these✔️

Correct Answer Logic:

The UK has an uncodified constitution; it can be amended by a simple majority in Parliament.

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Geography QUESTION #6295

Question 2134

Which of the following best explains the relationship between isostasy and mountain building in the context of plate tectonics?

Isostatic equilibrium prevents mountains from exceeding 8000m in height
Mountain roots extend deep into the mantle to maintain isostatic balance, with depth proportional to elevation✔️
Isostasy only applies to oceanic crust, not continental mountain ranges
Mountain building disrupts isostasy permanently until erosion occurs

Correct Answer Logic:

Isostasy describes the gravitational equilibrium between Earth's lithosphere and asthenosphere. Mountains have deep crustal roots (like icebergs) extending into the mantle to maintain balance - the Airy hypothesis of isostatic compensation. The greater the elevation, the deeper the root, maintaining equilibrium.

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Boilers Mechanical Engineering QUESTION #2451

Question 2135

The static deflection $x_{st} = F_0/k$ is used to express the natural frequency as:

$\omega_n = \sqrt{g/x_{st}}$ (using gravity $g$ and static deflection under weight)✔️
$\omega_n = x_{st}/g$
$\omega_n = k\cdot x_{st}$
$\omega_n = g\cdot x_{st}$

Correct Answer Logic:

Since $x_{st}=mg/k$, we have $k/m=g/x_{st}$, hence $\omega_n=\sqrt{k/m}=\sqrt{g/x_{st}}$.

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Paper-II (Pharmacognosy and Pharmaceutics-I) QUESTION #3642

Question 2136

'Ipecac' is used in emergency medicine as an 'Emetic'. This means it:

Stops diarrhea
Induces vomiting✔️
Relieves pain
Cures infection

Correct Answer Logic:

Ipecac syrup was historically used to empty the stomach after poisoning.

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Biology QUESTION #4309

Question 2137

Which property of water helps in moderating Earth's climate and maintaining stable temperature in aquatic environments?

Low viscosity
High specific heat capacity✔️
High surface tension
High polarity

Correct Answer Logic:

Water has a high specific heat capacity, meaning it can absorb or release large amounts of heat with minimal temperature change, moderating climate and stabilizing aquatic temperatures.

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Physics QUESTION #410

Question 2138

Transverse waves cannot be setup in __________

Metals
Solids
Fluids✔️
Soil

Correct Answer Logic:

Fluids cannot support shear stress required for transverse waves

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Mathematics QUESTION #4107

Question 2139

The residue of $\dfrac{5Z-2}{Z(Z-1)}$ at the pole $Z=0$ is:

$3$
$2$✔️
$5$
$-2$

Correct Answer Logic:

Residue at simple pole $Z=0$: $\lim_{Z\to0}Z\cdot\dfrac{5Z-2}{Z(Z-1)}=\lim_{Z\to0}\dfrac{5Z-2}{Z-1}=\dfrac{0-2}{0-1}=\dfrac{-2}{-1}=2$. So Res$_{Z=0}=2$.

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Biology QUESTION #4223

Question 2140

Which competitive inhibitor blocks the enzyme responsible for bacterial cell wall synthesis?

Sulphonamide
Streptomycin
Tetracycline
Penicillin✔️

Correct Answer Logic:

Penicillin inhibits cell wall synthesis enzymes.

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