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Chemistry QUESTION #1089
Question 1
The ratio of wavelengths of light absorbed by hydrogen atom for \(n=2\to n=3\) and \(n=4\to n=6\) transitions is:
  • \(\dfrac{1}{9}\)
  • \(\dfrac{1}{4}\)โœ”๏ธ
  • \(\dfrac{1}{36}\)
  • \(\dfrac{1}{16}\)
Correct Answer Logic:
For hydrogen: \(\frac{1}{\lambda} = R_H\left(\frac{1}{n_1^2}-\frac{1}{n_2^2}\right)\). Transition 1 (\(n=2\to3\)): \(\frac{1}{\lambda_1}=R_H\left(\frac{1}{4}-\frac{1}{9}\right)=R_H\cdot\frac{5}{36}\). Transition 2 (\(n=4\to6\)): \(\frac{1}{\lambda_2}=R_H\left(\frac{1}{16}-\frac{1}{36}\right)=R_H\cdot\frac{5}{144}\). Ratio: \(\frac{\lambda_1}{\lambda_2}=\frac{5/144}{5/36}=\frac{36}{144}=\frac{1}{4}\).
Uploaded by: Fani Warraich
General Knowledge QUESTION #2606
Question 2
Which of the following binary numbers is VALID? (Remember: binary uses only 0s and 1s)
  • 10293
  • 11012
  • 10110โœ”๏ธ
  • 20101
Correct Answer Logic:
The binary (base-2) system uses ONLY digits 0 and 1. '10110' contains only 0s and 1s, making it valid binary. '10293' contains 2, 3, and 9; '11012' contains 2; '20101' contains 2 โ€” all invalid in binary.
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Islamic Studies QUESTION #337
Question 3
How many Surahs in the Quran are named after Prophets?
  • 3
  • 4
  • 5
  • 6โœ”๏ธ
Correct Answer Logic:
The Surahs are: Yunus, Hud, Yusuf, Ibrahim, Nuh, and Muhammad (Peace be upon them).
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Paper-II (Pharmacognosy and Pharmaceutics-I) QUESTION #3677
Question 4
Which 'Sugar' is commonly used as a tablet diluent and is obtained from milk?
  • Sucrose
  • Lactoseโœ”๏ธ
  • Fructose
  • Glucose
Correct Answer Logic:
Lactose (milk sugar) is a common pharmaceutical excipient.
Uploaded by: Fani Warraich
Correct Answer Logic:

Acidic medium (oxidising agent):
$[\text{Fe(CN)}_6]^{4-} + H_2O_2 + 2H^+ \to [\text{Fe(CN)}_6]^{3-} + \text{H}_2\text{O}$
H$_2$O$_2$ is reduced to H$_2$O. Other product: H$_2$O.

Alkaline medium (reducing agent):
$H_2O_2 \to H_2O + \frac{1}{2}O_2$ (H$_2$O$_2$ is oxidized)
$2[\text{Fe(CN)}_6]^{3-} + H_2O_2 + 2OH^- \to 2[\text{Fe(CN)}_6]^{4-} + O_2 + 2H_2O$
Other products: H$_2$O and O$_2$.

So the pair is: H$_2$O (acidic) and (H$_2$O + O$_2$) (alkaline).

Uploaded by: Fani Warraich
English QUESTION #8356
Question 6
Apparel means:
  • appearance
  • clothesโœ”๏ธ
  • Impression
  • luggage
Correct Answer Logic:
Apparel means clothing.
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Chemistry QUESTION #7201
Question 7
Select the correct list of all naturally occurring isotopes of hydrogen.
  • Tritium and Protium only
  • Protium and Deuterium only
  • Protium, Deuterium, and Tritiumโœ”๏ธ
  • Deuterium and Tritium only
Correct Answer Logic:
  • Hydrogen has three main isotopes:
  • Protium ($^1H$): The most common, with no neutrons.
  • Deuterium ($^2H$): Also known as heavy hydrogen, with one neutron.
  • Tritium ($^3H$): A radioactive isotope with two neutrons.
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Paper-II (Pharmacognosy and Pharmaceutics-I) QUESTION #3675
Question 8
'Phytochemistry' is the study of:
  • Plant classification
  • Plant chemicals (phytochemicals)โœ”๏ธ
  • Plant growth
  • Soil
Correct Answer Logic:
It focuses on the extraction and identification of plant constituents.
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Correct Answer Logic:

Entropy is a state function. This means the change in entropy depends only on the initial and final states of the system, not on the path or the number of intermediate steps taken to reach that state.

Since the body is heated from an initial temperature $T_1 = 373 \text{ K}$ to a final temperature $T_2 = 473 \text{ K}$ in both cases, the entropy change $\Delta S$ of the body will be identical in both scenarios.

$\Delta S = \int \frac{dQ}{T} = \int_{T_1}^{T_2} \frac{ms dT}{T} = C \ln \left( \frac{T_2}{T_1} \right)$.

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Economics QUESTION #1679
Question 10
For a person who has never consumed cigarettes, the price elasticity of demand for cigarettes would best be described as:
  • Unitary price elastic
  • Relatively price inelastic
  • Perfectly price elastic
  • Perfectly price inelasticโœ”๏ธ
Correct Answer Logic:
A non-smoker assigns zero value to cigarettes โ€” no quantity would be demanded regardless of the price. Perfectly price inelastic demand (\(P_e = 0\)) means the quantity demanded does not change at all with price changes, represented by a vertical demand curve. This contrasts with a heavy smoker, whose demand would be relatively inelastic (but not perfectly so), and a casual smoker whose demand may be more responsive.
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Quantitative Reasoning QUESTION #8047
Question 11
PRECIPITATE: Choose the word most nearly opposite in meaning to this word.
  • deliberateโœ”๏ธ
  • determined
  • dissident
  • desperate
Correct Answer Logic:
PRECIPITATE (as an adjective) means acting hastily without careful thought โ€” rash or impulsive. Its antonym is deliberate, which means done carefully and intentionally with full consideration. 'Determined' means resolute. 'Dissident' means disagreeing. 'Desperate' means in despair. Only 'deliberate' directly opposes the rushed, unthinking nature of 'precipitate.'
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Boilers Mechanical Engineering QUESTION #3994
Question 12
If an Inspector discovers a 'Structural Flaw' that makes a boiler dangerous, they are empowered to:
  • Give a verbal warning only
  • Immediately prohibit the use of the boilerโœ”๏ธ
  • Suggest a paint job
  • Wait until the next annual inspection
Correct Answer Logic:
Safety is the priority; the Inspector can issue an order to stop operation until repairs are certified.
Uploaded by: Fani Warraich
Correct Answer Logic:
Since 1 byte = 8 bits: \(5 \times 8 = 40\) bits. Each character in a simple text file typically requires 1 byte (8 bits) of storage. This is a fundamental calculation for understanding file sizes and storage requirements.
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Dairy Food Science and Technology QUESTION #5879
Question 14
Whey proteins are nutritionally superior to casein primarily because they:
  • Have a higher total protein content in milk
  • Contain more essential amino acids and higher biological value \((\text{BV} \approx 100)\)โœ”๏ธ
  • Are heat stable and resistant to digestion
  • Contain more phosphorus and calcium
Correct Answer Logic:
Whey proteins (\(\beta\)-lactoglobulin and \(\alpha\)-lactalbumin) have a biological value approaching \(100\) and a PDCAAS of \(1.0\), reflecting their excellent essential amino acid profile including high leucine, cysteine, and BCAAs.
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General Knowledge QUESTION #9026
Question 15
In 1946, which province had the only government in India headed by the All India Muslim League?
  • Sindh
  • Punjab
  • Bengalโœ”๏ธ
  • North West Frontier Province (NWFP)
Correct Answer Logic:
Bengal had a Muslim League government in 1946.
Uploaded by: Fani Warraich
Correct Answer Logic:
Norm referencing (or normative comparison) involves interpreting an individual's test score by comparing it to a normative sample โ€” a large, representative group of people who have taken the same test. This allows psychologists to determine where a person stands relative to the population (e.g., percentile rank, standard scores like IQ). Norms must be established on a relevant, representative sample.
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Correct Answer Logic:

For non-zero solution, $\Delta=0$:

$\begin{vmatrix}1&k&3\\3&k&-2\\2&4&-3\end{vmatrix}=1(โˆ’3k+8)โˆ’k(โˆ’9+4)+3(12โˆ’2k)=โˆ’3k+8+5k+36โˆ’6k=44โˆ’4k=0$

So $k=11$.

With $k=11$: from equations 1 and 2: $x+11y+3z=0$ and $3x+11y-2z=0$. Subtracting: $2x-5z=0\Rightarrow x=\frac{5z}{2}$.

Substituting back: $\frac{5z}{2}+11y+3z=0\Rightarrow 11y=-\frac{11z}{2}\Rightarrow y=-\frac{z}{2}$.

$\frac{xz}{y^2}=\frac{\frac{5z}{2}\cdot z}{\frac{z^2}{4}}=\frac{\frac{5z^2}{2}}{\frac{z^2}{4}}=\frac{5}{2}\times4=\mathbf{10}$

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Chemistry QUESTION #445
Question 18
Sulphuric acid is used to manufacture
  • HCl and HNO?
  • H?PO?
  • Both A and B
  • Both HCl and 2COOHโœ”๏ธ
Correct Answer Logic:
H?SO? is used to make HCl, HNO?, and other acids
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Paper-I (Anatomy/Physiology and Biochemistry/Microbiology) QUESTION #3533
Question 19
'Maceration' is a process where the drug is:
  • Boiled in water
  • Soaked in a solvent for a specific period at room temperatureโœ”๏ธ
  • Burned to ash
  • Crushed into a fine powder only
Correct Answer Logic:
Maceration is a passive extraction process.
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Paper-II (Pharmacognosy and Pharmaceutics-I) QUESTION #3679
Question 20
'Palisade cells' are a type of tissue found in:
  • Roots
  • Mesophyll of leavesโœ”๏ธ
  • Bark
  • Wood
Correct Answer Logic:
They contain chloroplasts and are studied in leaf microscopy.
Uploaded by: Fani Warraich