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Physics QUESTION #7860

Question 2261

Nurse pushing wheelchair: work done by patient's weight:

Half
Max
Min
Zero✔️

Correct Answer Logic:

Weight acts vertically, displacement horizontal → θ=90°, cos90=0 → W=0.

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Agronomy QUESTION #2098

Question 2262

Soil salinity is measured as electrical conductivity of saturated paste extract ($EC_e$) in dS/m. A soil with $EC_e > 4$ dS/m is classified as saline because:

It exceeds the threshold for salt precipitation in the soil profile
Most sensitive crops (rice, beans, citrus) begin to show yield reduction above 4 dS/m — this threshold was established by the USDA salinity laboratory as the boundary between non-saline and saline soils affecting sensitive crop species✔️
All crops show complete yield loss at this salinity level
The osmotic pressure at 4 dS/m equals the root pressure of most crops

Correct Answer Logic:

The USDA classification: non-saline (<2 dS/m), slightly saline (2–4), moderately saline (4–8), strongly saline (8–16), very strongly saline (>16). The 4 dS/m threshold is agronomically significant because sensitive crops (beans, strawberry, rice) show measurable yield loss above this level. Tolerant crops (barley, cotton, sugar beet) withstand much higher levels — salt tolerance is crop-specific.

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Mathematics QUESTION #7444

Question 2263

The mean of the data set comprising of 16 observations is 16. If one of the observations valued 16 is deleted and three new observations valued 3, 4 and 5 are added to the data, then the mean of the resultant data is:

16.8
16
15.8
14✔️

Correct Answer Logic:

Original sum = $16 \times 16 = 256$. After deleting 16: new sum = $256 - 16 = 240$. After adding 3, 4, 5: new sum = $240 + 3 + 4 + 5 = 252$. Number of observations = $16 - 1 + 3 = 18$. New mean = $\frac{252}{18} = 14$.

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Islamic Studies QUESTION #632

Question 2264

The basic obligatory action of Hajj is:

Wuquf-e-Arafat✔️
Rami
Tawaf-e-Ziyarat
None of these

Correct Answer Logic:

Wuquf (standing) at Arafat is the most essential pillar of Hajj.

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Physics QUESTION #1185

Question 2265

The Poynting vector represents:

The rate and direction of electromagnetic energy transferred in space.✔️
The amount of electromagnetic energy transferred in different forms of energy.
Loss of electromagnetic energy in a medium.
The flow of thermal energy in a certain direction.

Correct Answer Logic:

The Poynting vector $\vec{S} = \frac{1}{\mu_0}(\vec{E} \times \vec{B})$ represents the instantaneous power per unit area (energy flux density) carried by an electromagnetic wave. Its direction gives the direction of energy propagation and its magnitude gives the rate of energy transfer per unit area (W/m²).

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General Knowledge QUESTION #4804

Question 2266

Which country permanently abolished its military forces by constitutional provision?

Costa Rica✔️
Japan
Iceland
Panama

Correct Answer Logic:

Costa Rica permanently abolished its military in 1948 under President José Figueres Ferrer. Article 12 of the Costa Rican Constitution prohibits the army as a permanent institution.

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Therapeutics and Patient Care QUESTION #3911

Question 2267

What is the primary mechanism by which corticosteroids produce a beneficial therapeutic effect in acute severe asthma?

They cause acute bronchodilation
They reduce the inflammatory response✔️
They suppress precipitating infections
They prevent mediator release from mast cells

Correct Answer Logic:

Corticosteroids exert their anti-asthmatic effect by broadly suppressing the airway inflammatory response, reducing oedema, mucus production, and inflammatory cell infiltration, thereby improving airflow.

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Reading and Writing (Module-1) QUESTION #5452

Question 2268

Notes: Haudenosaunee Confederacy (1,000-year alliance of six nations, Great Law of Peace). Bruce Johansen believes Great Law influenced US Constitution (influence theory). Which choice presents this theory to an unfamiliar audience?

Bruce Johansen believes the Great Law was very influential.
Influence theory is supported by Franklin and Jefferson studying the Confederacy.
Influence theory holds that principles of the Great Law of Peace, a centuries-old agreement binding six Native nations in the northeastern US, influenced the US Constitution.✔️
Native people influenced US founding in many ways.

Correct Answer Logic:

Option C clearly defines the theory and explains the Great Law for an unfamiliar audience.

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Mathematics QUESTION #7476

Question 2269

The length of the projection of the line segment joining the points (5, -1, 4) and (4, -1, 3) on the plane $x + y + z = 7$ is:

$\frac{1}{3}$
$\sqrt{\frac{2}{3}}$✔️
$\frac{2}{\sqrt{3}}$
$\frac{2}{3}$

Correct Answer Logic:

The vector joining the points is $\vec{PQ} = (-1, 0, -1)$, with magnitude $\sqrt{1+0+1} = \sqrt{2}$. Normal to plane is $\vec{n} = (1,1,1)$ with magnitude $\sqrt{3}$. The component of $\vec{PQ}$ perpendicular to plane is $\frac{\vec{PQ} \cdot \vec{n}}{|\vec{n}|} = \frac{-1+0-1}{\sqrt{3}} = \frac{-2}{\sqrt{3}}$. Projection length = $\sqrt{|\vec{PQ}|^2 - (\frac{\vec{PQ} \cdot \vec{n}}{|\vec{n}|})^2} = \sqrt{2 - \frac{4}{3}} = \sqrt{\frac{2}{3}}$.

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Physics QUESTION #420

Question 2270

Light year is a measure of

Distance✔️
Time
Intensity of light
Velocity

Correct Answer Logic:

Light year is a unit of distance

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General Abilities QUESTION #2907

Question 2271

Volume of a cylinder with radius $7$ cm and height $10$ cm is:

$1540\text{ cm}^3$✔️
$770\text{ cm}^3$
$440\text{ cm}^3$
$154\text{ cm}^3$

Correct Answer Logic:

Volume $= \pi r^2 h = (22/7) \times 49 \times 10 = 1540$.

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Security Measures to Maintain Law and Order QUESTION #933

Question 2272

What does the term 'Access Control' specifically regulate?

Public transportation
Entry and exit of people and vehicles✔️
Flight departure times
Airport revenue

Correct Answer Logic:

Access control ensures that only authorized individuals can enter specific restricted or sensitive zones.

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Pakistan Affairs QUESTION #9088

Question 2273

Pakistan is located in which region of Asia?

East Asia
South East Asia
South Asia✔️
North East Asia

Correct Answer Logic:

Pakistan is in South Asia.

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Nursing QUESTION #9295

Question 2274

In postoperative care, the nurse monitors a patient for paralytic ileus. Which assessment finding indicates return of bowel function?

Passage of flatus✔️
Absence of pain
Ability to tolerate sips of water
Normal blood pressure

Correct Answer Logic:

Paralytic ileus is the temporary cessation of bowel motility after abdominal surgery. Return of bowel function is confirmed by:

Passage of flatus (gas) — earliest and most reliable sign of return of peristalsis
Bowel sounds (return in small bowel first, usually 24–48 hrs; large bowel 48–72 hrs)
Passage of stool

Assessment sequence for bowel function return:

Auscultate for bowel sounds (all four quadrants, 2 minutes each)
Ask patient about passage of gas (flatus)
Advance diet only after confirmed peristalsis (clear liquids → soft → regular)

Failure of bowel function to return may indicate mechanical obstruction, which requires surgical intervention — a critical distinction for Charge/Head Nurses.

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Paper-I (Anatomy/Physiology and Biochemistry/Microbiology) QUESTION #3308

Question 2275

'Aerosols' are a major route of transmission for which type of diseases?

Foodborne
Waterborne
Airborne (Respiratory)✔️
Vector-borne

Correct Answer Logic:

Tiny droplets suspended in the air can carry pathogens like those causing TB or Flu.

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Nursing QUESTION #9160

Question 2276

In nursing management, Management by Objectives (MBO) was developed by:

Frederick Taylor
Peter Drucker✔️
Abraham Maslow
Douglas McGregor

Correct Answer Logic:

Management by Objectives (MBO) was introduced by Peter Drucker in his 1954 book The Practice of Management. MBO is a process where:

Managers and employees jointly set specific, measurable objectives
Performance is evaluated against these pre-set objectives
Feedback and appraisal are systematic

In nursing management, MBO helps Head Nurses set clear performance targets for nursing staff, improving accountability and service quality. Other options: Frederick Taylor — Scientific Management; Maslow — Hierarchy of Needs; McGregor — Theory X and Y.

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Statistics QUESTION #1963

Question 2277

The statistical measure that describes the extent to which numerical data tends to scatter or deviate around a central average is known as:

Dispersion✔️
Regression
Correlation
Kurtosis

Correct Answer Logic:

Dispersion refers to the spread or scatter of data values around an average. Common measures include range, variance $\sigma^2$, and standard deviation $\sigma$.

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Chemistry QUESTION #7164

Question 2278

In the redox titration of oxalate ions with permanganate in an acidic medium, how many electrons are involved in the production of a single molecule of $CO_{2}$?

$5$
$2$
$10$
$1$✔️

Correct Answer Logic:

The half-reaction for oxalate is: $C_{2}O_{4}^{2-} \rightarrow 2CO_{2} + 2e^{-}$. In this process, 2 electrons are released for every two molecules of $CO_{2}$ produced. Therefore, for one molecule of $CO_{2}$, the number of electrons involved is $2/2 = 1$.

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