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Chemistry QUESTION #7190

A $15\text{ mL}$ aqueous solution containing $Fe^{2+}$ ions in an acidic medium reacts completely with $20\text{ mL}$ of $0.03\text{ M}$ aqueous ${Cr_{2}O_{7}}^{2-}$. Calculate the molarity of the $Fe^{2+}$ solution (provide the result in terms of $\times 10^{-2}\text{ M}$).

24✔️
12
4
8

Correct Answer Logic:

The balanced redox equation is:

$6Fe^{2+} + Cr_{2}O_{7}^{2-} + 14H^{+} \rightarrow 6Fe^{3+} + 2Cr^{3+} + 7H_{2}O$

Using the equivalence principle ($n_{1}M_{1}V_{1} = n_{2}M_{2}V_{2}$):

For $Fe^{2+}$, $n$-factor is $1$.
For $Cr_{2}O_{7}^{2-}$, $n$-factor is $6$.

$1 \times M_{Fe} \times 15 = 6 \times 0.03 \times 20$

$15 M_{Fe} = 3.6 \Rightarrow M_{Fe} = 0.24\text{ M} = 24 \times 10^{-2}\text{ M}$.

[cite: 13]

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General Knowledge QUESTION #8889

Question 2

The Wimbledon Tennis Grounds are located in which country?

Australia
France
England✔️
Germany

Correct Answer Logic:

Wimbledon is in London, England.

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Pakistan Affairs QUESTION #601

Question 3

Rohtas Fort, located in Jhelum was built by:

Zaheer ud Din Babur
Mohammad Tughlaq
Sher Shah Suri✔️
None of These

Correct Answer Logic:

Sher Shah Suri constructed this fortress in the 16th century.

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Paper-I (Anatomy/Physiology and Biochemistry/Microbiology) QUESTION #3371

Question 4

'Endemic' means a disease is:

Constantly present in a certain population or area✔️
Found only in the air
Very deadly
Easily cured

Correct Answer Logic:

For example, Malaria is endemic in certain tropical regions.

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HR and Management QUESTION #6429

Question 5

According to the text, the largest single expense in most organizations is:

Raw materials and inventory costs
Technology and infrastructure investment
Labor costs✔️
Marketing and sales expenses

Correct Answer Logic:

The text explicitly states that the largest single expense in most organizations is labor cost, which is often considerably higher than necessary due to problems like absenteeism, tardiness, and discrimination. This makes effective HRM critical for cost management.

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General Abilities QUESTION #4496

Question 6

Which of the following is a prime number?

$21$
$27$
$29$✔️
$33$

Correct Answer Logic:

$29$ has only two factors: $1$ and $29$. Others: $21 = 3 \times 7$, $27 = 3^3$, $33 = 3 \times 11$

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Pakistan Affairs QUESTION #9083

Question 7

In the total area of Pakistan, what is the approximate share of Punjab province?

$20\%$
$25\%$✔️
$35\%$
$42\%$

Correct Answer Logic:

Punjab covers about 25% of Pakistan's total area.

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Civil Procedure QUESTION #3721

Question 8

A neighbor's tree has a large, dead branch hanging over a homeowner's driveway. The homeowner warns the neighbor multiple times, but the neighbor does nothing. During a mild breeze, the branch falls and crushes the homeowner's car. What is the neighbor's best defense?

Act of God (the wind).
No duty to maintain natural conditions on land.
Contributory negligence by the homeowner for parking there.✔️
The neighbor had no 'intent' to harm the car.

Correct Answer Logic:

The neighbor was negligent in failing to prune a known dangerous branch. However, the neighbor will likely argue that the homeowner, knowing the danger, was contributorily negligent for parking directly under the branch.

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Paper-II (Pharmacognosy and Pharmaceutics-I) QUESTION #3036

Question 9

'Geometric Dilution' is a method used to:

Measure the volume of a liquid
Mix a small amount of potent drug with a large amount of diluent✔️
Increase the boiling point
Calculate the dose for children

Correct Answer Logic:

Geometric dilution ensures uniform distribution when mixing a potent drug with a larger amount of powder base.

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Math Physics Chemistry Biology QUESTION #4176

Question 10

A mutation prevents proper disulphide bond formation in a fibrous protein, causing brittle nails and slow hair growth. Which of the following proteinaceous substance would be affected?

Elastin
Actin
Keratin✔️
Collagen

Correct Answer Logic:

Keratin contains disulphide bonds that give strength to hair and nails.

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Pakistan Affairs QUESTION #592

Question 11

NWFP of British India was made a separate province in:

1901✔️
1849
1919
None of These

Correct Answer Logic:

It was carved out of Punjab as a separate province in 1901.

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English QUESTION #8440

Question 12

Identify the incorrectly spelled word:

Companion
Confusion
Privious✔️
Gratitude

Correct Answer Logic:

'Privious' is misspelled; correct is 'Previous'.

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Mathematics QUESTION #4142

Question 13

At the point $(0, b)$ on the ellipse $\frac{x^2}{a^2} + \frac{y^2}{b^2} = 1$, what is the radius of curvature $\rho$?

$\frac{a^2}{b}$✔️
$\frac{b^2}{a}$
$\frac{a}{b}$
$\frac{b}{a}$

Correct Answer Logic:

For ellipse $\frac{x^2}{a^2} + \frac{y^2}{b^2} = 1$, radius of curvature at $(0,b)$ (vertex on minor axis) is $\rho = \frac{a^2}{b}$.

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Urdu QUESTION #5092

Question 14

صفر کا متضاد کیا ہے؟

گرم
کبار
افضل
سلم✔️

Correct Answer Logic:

صفر کا متضاد 'سلم' ہے جس کے معنی سلامتی یا امن کے ہیں۔

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Boilers Mechanical Engineering QUESTION #2393

Question 15

The bandwidth $\omega_b$ of a closed-loop control system is defined as the frequency at which the closed-loop magnitude $M(\omega)$ drops to:

$M(\omega_b) = M(0)/2$
$M(\omega_b) = M(0)/\sqrt{2}$ (i.e., $-3$ dB below $M(0)$)✔️
$M(\omega_b) = 0$
$M(\omega_b) = M(0) \cdot \sqrt{2}$

Correct Answer Logic:

Bandwidth: $M(\omega_b)=M(0)/\sqrt{2}$, i.e., the response is $-3$ dB below its low-frequency value. In dB: $20\log M(\omega_b)=20\log M(0)-3$ dB. Larger bandwidth means faster system response.

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General Abilities QUESTION #2843

Question 16

At what rate of Simple Interest will Rs. 4500 amount to Rs. 5400 in 4 years?

4%
5%✔️
6%
7%

Correct Answer Logic:

SI $= 5400 - 4500 = 900$. Using $SI = \dfrac{P \times R \times T}{100}$: $900 = \dfrac{4500 \times R \times 4}{100} \Rightarrow 900 = 180R \Rightarrow R = 5\%$.

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Physics QUESTION #991

Question 17

A rectangular metallic loop moves out of a uniform magnetic field region into a field-free region at constant speed. When partially inside, the plot of magnitude of induced emf $(\varepsilon)$ with time $(t)$ is:

Linearly increasing graph
Decreasing curve (exponential)
Linearly increasing then constant
Constant (horizontal line)✔️

Correct Answer Logic:

As the loop exits at constant speed, the rate of change of flux is constant ($\varepsilon = Bvl$ = constant). So the emf is constant with time — represented by a horizontal line. Answer key: option (4) = constant horizontal line.

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Islamic Studies QUESTION #8226

Question 18

What caused Hazrat Usman's (R.A.) death?

he died in a battlefield
he was martyred by rebels✔️
he died a natural death
None of the above

Correct Answer Logic:

Hazrat Usman (RA) was martyred by rebels on 18 Dhul Hijjah 35 AH (June 656 CE) while reciting the Quran in his home in Medina. He was 82 years old and had been Caliph for 12 years. A group of rebels from Egypt, Kufa, and Basra laid siege to his house and eventually broke in and killed him. His martyrdom was a tragic event that led to the first major civil conflict (fitna) in Islamic history.

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Geography QUESTION #6320

Question 19

The break-of-bulk point in industrial location theory refers to:

Location where raw materials are extracted
Point where goods are transferred between transportation modes✔️
Market where finished products are sold
Factory where production occurs

Correct Answer Logic:

Break-of-bulk points are locations where goods transfer between transportation modes (e.g., ship to rail, rail to truck). These attract industries because goods are already stopped (minimizing additional transport) and handling facilities exist, reducing transshipment costs.

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Paper-I (Anatomy/Physiology and Biochemistry/Microbiology) QUESTION #3161

Question 20

'Arthritis' is a condition primarily affecting the:

Heart
Lungs
Joints✔️
Skin

Correct Answer Logic:

Arthritis involves inflammation, pain, and stiffness in the joints.

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