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Biology QUESTION #7765

Which organism is used in the production of Humulin (human insulin)?

Bacteria✔️
Fungi
Protozoa
Virus

Correct Answer Logic:

Recombinant E. coli (bacteria) or yeast are engineered to produce human insulin (Humulin). Bacteria are most common for large-scale production.

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Therapeutics and Patient Care QUESTION #3881

Question 2

Which of the following is NOT a recognised adverse effect associated with tricyclic antidepressant (TCA) therapy?

Sedation
Diarrhoea✔️
Blurred vision
Urinary retention

Correct Answer Logic:

TCAs cause constipation, not diarrhoea, due to anticholinergic effects reducing gastrointestinal motility. Sedation, blurred vision, and urinary retention are all classic TCA adverse effects.

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Islamic Studies QUESTION #7894

Question 3

What is the total number of types of Qias (Analogy)?

Two
Three✔️
Four
Five

Correct Answer Logic:

There are four types of Qias (Analogical Reasoning) in Islamic jurisprudence: (1) Qiyas al-'Illah (reasoning by effective cause), (2) Qiyas al-Dalalah (reasoning by indication), (3) Qiyas al-Shabah (reasoning by resemblance), and (4) Qiyas al-Tard (reasoning by co-existence). Qias is the fourth source of Islamic law after Quran, Sunnah, and Ijma.

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Electrical Engineering QUESTION #2164

Question 4

A BJT common-emitter amplifier has $\beta = 100$, $R_C = 4\,\text{k}\Omega$, and $I_{C,Q} = 1\,\text{mA}$. The small-signal voltage gain $A_v$ (neglecting $r_o$) is:

$-154$✔️
$+154$
$-400$
$-100$

Correct Answer Logic:

$g_m = I_C/V_T = 1\,\text{mA}/26\,\text{mV} \approx 38.5\,\text{mS}$. $A_v = -g_m R_C = -38.5\,\text{mS} \times 4\,\text{k}\Omega \approx -154$.

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Psychology QUESTION #1473

Question 5

Which of the following factors is most likely to influence the accuracy of eyewitness testimony?

The eyewitness's level of education
The eyewitness's emotional state during the event✔️
The time of day the event occurs
The presence of the police during the event

Correct Answer Logic:

Research by Elizabeth Loftus and others has shown that the eyewitness's emotional state during the event is a major factor affecting memory accuracy. High emotional arousal (especially fear or stress) can impair accurate encoding and recall — the 'weapon focus effect' is one example. Post-event misinformation, leading questions, and stress also distort memories. Education level and time of day have relatively little direct effect on accuracy.

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Physics QUESTION #7065

Question 6

Consider an n-type semiconductor where the electron density is $10^{19} \text{ m}^{-3}$ and the electron mobility is $1.6 \text{ m}^2/(\text{V}\cdot\text{s})$. If we neglect the contribution of holes, what is the approximate resistivity of this semiconductor?

$2 \ \Omega\text{m}$
$4 \ \Omega\text{m}$
$0.4 \ \Omega\text{m}$✔️
$0.2 \ \Omega\text{m}$

Correct Answer Logic:

Resistivity ($\rho$) is the reciprocal of conductivity ($\sigma$).

$\sigma = ne\mu_e$

Given: $n = 10^{19} \text{ m}^{-3}$, $\mu_e = 1.6 \text{ m}^2/\text{Vs}$, and $e = 1.6 \times 10^{-19} \text{ C}$.

$\sigma = 10^{19} \times (1.6 \times 10^{-19}) \times 1.6 = 1.6 \times 1.6 = 2.56 \ \Omega^{-1}\text{m}^{-1}$.

$\rho = \frac{1}{\sigma} = \frac{1}{2.56} \approx 0.39 \ \Omega\text{m}$.

The closest value provided is $0.4 \ \Omega\text{m}$.

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Accounting & Finance QUESTION #6121

Question 7

In which circumstances are unit costing and job costing used?

Option	Unit Costing	Job Costing
A	When a quantity of identical items is made	When each product is different
B	When each product is different	In continuous operations
C	In continuous operations	In continuous operations
D	When a quantity of identical items is made	When each product is different

Option A✔️
Option B
Option C
Option D

Correct Answer Logic:

Option A is correct.

Unit costing: Used for large quantities of identical products in a continuous process (e.g., bricks, bottles).
Job costing: Used when each job/product is unique (e.g., construction, custom printing).

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Agronomy QUESTION #2050

Question 8

Mode of action classification of herbicides is agronomically important because:

It determines the cost of herbicide application per unit area
Rotating herbicides with different modes of action is the primary strategy for delaying the evolution of herbicide-resistant weed populations✔️
It determines the withholding period before crop harvest
It identifies which herbicides can be mixed with fertilizers

Correct Answer Logic:

Herbicide resistance evolves when the same mode of action (MOA) is repeatedly used, selecting for resistant biotypes. Rotating herbicides across different MOA groups (HRAC/WSSA classification) prevents any single resistant genotype from dominating the weed population — the cornerstone of resistance management in modern weed science.

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Physics QUESTION #7036

Question 9

The density of a cube is calculated by measuring its mass and the length of its sides. If the relative error in mass is $1.5\%$ and in length is $1\%$, determine the maximum percentage error in the density.

$4.5\%$✔️
$6\%$
$2.5\%$
$3.5\%$

Correct Answer Logic:

Density ($\rho$) is given by: $\rho = \frac{M}{L^3}$

The relative error formula for density is:

$\frac{\Delta \rho}{\rho} \times 100 = \frac{\Delta M}{M} \times 100 + 3 \left( \frac{\Delta L}{L} \times 100 \right)$

Substitute the given values:

$\text{Max Error} = 1.5\% + 3(1\%) = 4.5\%$

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Biology QUESTION #539

Question 10

Which of the following are called placental mammals?

Prototheria
Eutheria✔️
Metatheria
All of these

Correct Answer Logic:

Eutheria are placental mammals

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General Knowledge QUESTION #4471

Question 11

_____ is the author of “Essay on Population (1798)”.

Thomas Malthus✔️
Ester Boserup
Garret Hardin
None of these

Correct Answer Logic:

Thomas Malthus authored 'An Essay on the Principle of Population' in 1798.

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General Abilities QUESTION #7974

Question 12

5448 rounded off to the nearest 1000 is:

6000
5400
5000✔️
4500

Correct Answer Logic:

Since the hundreds digit is 4 (i.e., 448 < 500), we round down: $5448 \approx 5000$.

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Electrical Engineering QUESTION #2136

Question 13

According to Tellegen's Theorem, for any network with $b$ branches and $n$ nodes, the algebraic sum of power delivered to all branches at any instant is:

Always positive
Dependent on the type of elements
Zero✔️
Equal to the total energy stored

Correct Answer Logic:

Tellegen's Theorem is based on KCL and KVL; it states that $\sum_{k=1}^{b} v_k i_k = 0$, meaning the sum of power delivered to all branches in a network is zero.

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Islamic Studies QUESTION #7903

Question 14

What is the name of the prophet who is one of Hazrat Daus?

Hazrat Hood✔️
Hazrat Ishaq
Hazrat Sulaiman
Hazrat Yousuf

Correct Answer Logic:

Hazrat Hood (AS) was sent to the people of 'Ad (not Daus). He warned them against idol worship and called them to monotheism, but they rejected him. Eventually, they were destroyed by a fierce wind. Hazrat Hood (AS) is mentioned in the Quran, and Surah 11 is named after him.

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Education QUESTION #6874

Question 15

Which of the following represents the MOST critical distinction between an 'authoritative' teacher and an 'authoritarian' teacher in the context of classroom management?

The authoritative teacher relies on rewards while the authoritarian relies on punishment
The authoritative teacher maintains discipline through mutual respect and firmness, while the authoritarian uses coercive commands and dictatorial control✔️
The authoritative teacher allows permissive student behavior, while the authoritarian enforces strict zero-tolerance policies
The authoritative teacher is effective only in small classes, while the authoritarian approach works in large classes

Correct Answer Logic:

The authoritative teacher establishes clear boundaries and high expectations while maintaining a warm, respectful relationship with students. The authoritarian teacher enforces compliance through power, commands, and coercion without consideration for student agency. Authoritativeness fosters internalized discipline; authoritarianism fosters compliance through fear.

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Planning QUESTION #4974

Question 16

In transportation planning, what does the 'peaking characteristic' measure?

Ratio of peak hour to average daily traffic✔️
Maximum speed achieved
Number of traffic signals
Average travel time

Correct Answer Logic:

Peaking characteristic (K-factor) is calculated as $K = \frac{\text{Peak Hour Volume}}{\text{AADT}/24}$ and typically ranges from 0.09 to 0.18, indicating how concentrated traffic is during peak hours, crucial for capacity planning.

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Therapeutics and Patient Care QUESTION #3908

Question 17

Which of the following medications is recommended as a specific treatment for benign prostatic hyperplasia (BPH) by reducing prostate volume?

Spironolactone
Cyproterone acetate
Finasteride✔️
Tibolone

Correct Answer Logic:

Finasteride is a $5\alpha$-reductase inhibitor that reduces dihydrotestosterone (DHT) production, decreasing prostate volume and improving urinary symptoms in BPH.

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Accounting & Finance QUESTION #6196

Question 18

Calculate the Future Value ($FV$) of $\$2,000$ invested for $2$ years at $10\%$ compound interest.

$2,200
$2,400
$2,420✔️
$2,662

Correct Answer Logic:

$FV = 2000(1.10)^2 = 2000 \times 1.21 = 2420$ [cite: 50, 51].

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Math Physics Chemistry Biology QUESTION #798

Question 19

Which of the following has a net dipole moment?

$\text{CO}$
$\text{NH}_3$
$\text{H}_2\text{O}$
All of these✔️

Correct Answer Logic:

CO has a small dipole moment. $\text{NH}_3$ (pyramidal) and $\text{H}_2\text{O}$ (bent) both have significant net dipole moments. All three have net dipole moments.

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Statistics QUESTION #2009

Question 20

In the ANOVA table for an RCB design with $SS_{error} = 2.6249$ and error $df = 24$, the standard error for the difference between two treatment means $(\bar{y}_{i.} - \bar{y}_{j.})$ is:

$\sqrt{\dfrac{MS_E}{b}}$
$\sqrt{\dfrac{2 \cdot MS_E}{b}}$✔️
$\sqrt{MS_E}$
$\dfrac{MS_E}{b}$

Correct Answer Logic:

The standard error for comparing two treatment means in RCBD is $SE_{diff} = \sqrt{\dfrac{2 MS_E}{b}}$, where $b$ is the number of blocks (replications per treatment). Here $MS_E = 2.6249/24 = 0.1094$, so $SE_{diff} = \sqrt{2(0.1094)/9} \approx 0.1559$.

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