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Molybdenum (Mo) is an essential micronutrient required for nitrogen fixation. It is a component of the nitrogenase enzyme complex (specifically the FeMo-cofactor of the MoFe protein) in nitrogen-fixing bacteria such as Rhizobium found in legume root nodules. Without Mo, nitrogenase cannot reduce atmospheric N$_2$ to ammonia.

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Chemistry QUESTION #7504

Question 5246

What is the correct IUPAC name of the organic compound with structure: two methyl groups on C1 of a double bond (C1=C2), with a hydrogen on C2, and a bromo-methyl group on C3?
(The compound is: $\text{CH}_3\text{C(CH}_3\text{)=CHCH(Br)CH}_3$, i.e., a five-carbon chain with a double bond and bromine substituent)

3-Bromo-1,2-dimethylbut-1-ene
3-Bromo-3-methyl-1,2-dimethylprop-1-ene
2-Bromo-3-methylpent-3-ene
4-Bromo-3-methylpent-2-ene✔️

Correct Answer Logic:

Identify the longest chain containing the double bond: 5 carbons (pent), with double bond at C2 (pent-2-ene).

Number from the end that gives the double bond the lower locant. A methyl group appears at C3 and Br at C4.

IUPAC name: 4-Bromo-3-methylpent-2-ene

This is a 5-carbon chain ($n = 5$: pent) with double bond at position 2 (C2=C3), methyl at C3, and Br at C4.

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English QUESTION #2746

Question 5247

Choose the CORRECT sentence.

Between you and I✔️
this is wrong.
Between you and me
this is wrong.

Correct Answer Logic:

this is wrong.

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Paper-I (Anatomy/Physiology and Biochemistry/Microbiology) QUESTION #3208

Question 5248

The 'Enteric Nervous System' is often called the 'Little Brain' because:

It is located in the skull
It can control GI function independently of the CNS✔️
It is very small
It only works during sleep

Correct Answer Logic:

The myenteric and submucosal plexuses manage motility and secretion locally.

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General Knowledge QUESTION #2638

Question 5249

UEFI (Unified Extensible Firmware Interface) is the modern replacement for which older technology?

SATA interface for hard drive connections
BIOS (Basic Input Output Services)✔️
ATX form factor for motherboards
DRAM for temporary memory storage

Correct Answer Logic:

UEFI (Unified Extensible Firmware Interface) is the modern replacement for the traditional BIOS. While BIOS had limitations such as support for only older storage systems and slower boot times, UEFI offers a graphical interface, faster boot times, support for larger drives, and improved security features like Secure Boot.

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Paper-I (Anatomy/Physiology and Biochemistry/Microbiology) QUESTION #3330

Question 5250

'Opportunistic' pathogens are those that:

Always cause disease in healthy people
Only cause disease when the host's immune system is weakened✔️
Cannot live outside a lab
Are used to make bread

Correct Answer Logic:

Common examples include *Candida* and *Pseudomonas*.

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Chemistry QUESTION #7176

Question 5251

In a $10 \text{ m}^{3}$ container at $1000 \text{ K}$, a mixture of $0.5$ moles of gas A and $x$ moles of gas B exerts a total pressure of $200 \text{ Pa}$. If $R$ is the gas constant, find the value of $x$.

$\frac{2R}{4+R}$
$\frac{2R}{4-R}$
$\frac{4+R}{2R}$
$\frac{4-R}{2R}$✔️

Correct Answer Logic:

Using the Ideal Gas Equation $PV = nRT$:

Total moles $n = 0.5 + x$
$200 \times 10 = (0.5 + x) \times R \times 1000$
$2000 = (0.5 + x)1000R$
$2 = (0.5 + x)R$
$2/R = 0.5 + x$
$x = \frac{2}{R} - \frac{1}{2} = \frac{4-R}{2R}$

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Paper-I (Anatomy/Physiology and Biochemistry/Microbiology) QUESTION #3441

Question 5252

'RBCs' (Red Blood Cells) rely exclusively on which pathway for energy?

Beta-oxidation
Glycolysis✔️
Krebs Cycle
Electron Transport Chain

Correct Answer Logic:

RBCs lack mitochondria and must use anaerobic glycolysis.

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General Knowledge QUESTION #4792

Question 5253

In which year did the British government transfer Kashmir to Gulab Singh?

1846✔️
1845
1843
1848

Correct Answer Logic:

Under the Treaty of Amritsar in 1846, the British sold Kashmir to Maharaja Gulab Singh for 7.5 million Nanakshahis, making him the Maharaja of Jammu and Kashmir.

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Islamic Studies QUESTION #7919

Question 5254

Who are the angels appointed to question the deads in their graves?

Munkir and Nakeer (AS)✔️
Hazrat Jahraiel (AS)
Hazrat Iiraeel (AS)
Hazrat Kikaet (M)

Correct Answer Logic:

Munkar and Nakir are the two angels who question the deceased in their graves. They ask three questions: (1) Who is your Lord? (2) What is your religion? (3) Who is your Prophet? This questioning is part of the trial in the grave (Barzakh), and believers answer correctly while disbelievers fail.

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General Knowledge QUESTION #8800

Question 5255

Which woman scientist twice won the Nobel Prize?

Barbara McClintock
Marie Curie✔️
Dorothy Hodgkin
Rosalyn Yalow

Correct Answer Logic:

Marie Curie won in Physics (1903) and Chemistry (1911).

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Islamic Studies QUESTION #654

Question 5256

The "Year of the Elephant" (Am al-Fil) is associated with the birth of:

Hazrat Abu Bakr
The Holy Prophet (ﷺ)✔️
Hazrat Ali
None of these

Correct Answer Logic:

It refers to the year 570 CE, when the Prophet (ﷺ) was born.

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Nursing QUESTION #9157

Question 5257

A community health nurse is assessing a village. According to the PRECEDE-PROCEED model, which phase involves identifying predisposing, reinforcing, and enabling factors?

Administrative and policy diagnosis
Social diagnosis
Educational and ecological diagnosis✔️
Epidemiological diagnosis

Correct Answer Logic:

In the PRECEDE-PROCEED Model (Green & Kreuter), the phases are:

Social assessment
Epidemiological assessment
Educational and ecological assessment — This phase identifies:

Predisposing factors: knowledge, attitudes, beliefs, values
Enabling factors: skills, resources, barriers
Reinforcing factors: rewards, feedback, social support

This model is widely used in community health nursing to plan and evaluate health education programmes — essential knowledge for Head Nurse and Charge Nurse positions.

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General Knowledge QUESTION #4803

Question 5258

Martin Luther King Jr. is most famous for leading which movement?

Civil rights movement using nonviolent resistance in the USA✔️
Civil rights movement using violence in South Africa
Civil rights movement using nonviolence in India
Civil rights movement using nonviolence in Costa Rica

Correct Answer Logic:

Martin Luther King Jr. was an American clergyman and civil rights leader who led the American civil rights movement using nonviolent civil disobedience inspired by Mahatma Gandhi's teachings.

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The Constitution of Pakistan QUESTION #9376

Question 5259

Under Article 239(4), a constitutional amendment Bill altering provincial limits must be passed by the concerned Provincial Assembly by:

Simple majority
Two-thirds of its total membership✔️
Three-fourths of its total membership
Unanimous vote

Correct Answer Logic:

Article 239(4) provides that a Bill 'which would have the effect of altering the limits of a Province shall not be presented to the President for assent unless it has been passed by the Provincial Assembly of that Province by the votes of not less than two-thirds of its total membership.' This is an additional step beyond the normal two-thirds in both Houses.

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Accounting & Finance QUESTION #6061

Question 5260

A house building advance of Rs. 2 million is paid to employees. In accounting terms, this payment is classified as a:

Asset✔️
Revenue Expenditure
Capital Expenditure
Deferred Revenue Expenditure

Correct Answer Logic:

An advance paid to employees (such as a house-building advance) creates a receivable for the organization — the employee owes the money back. It is therefore recorded as an Asset (specifically a long-term receivable or loan to employees) on the balance sheet. It is not an expense until it is written off or adjusted, so it is neither revenue expenditure nor capital expenditure in the traditional sense.

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