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The froth floatation method is primarily used for the concentration of sulphide ores. Among the options, Galena ($PbS$) is a sulphide ore, while Siderite and Malachite are carbonates, and Magnetite is an oxide. Therefore, Galena is the best fit for this method.

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Boilers Mechanical Engineering QUESTION #2441

Question 167

For forced undamped vibrations, the equation of motion $m\ddot{x}+kx=F_0\sin pt$ has a particular solution (forced response amplitude) of:

$X = \frac{F_0/k}{1-(p/\omega_n)^2}$ for $p\neq\omega_n$✔️
$X = \frac{F_0}{k}$
$X = \frac{F_0}{k}\cdot\frac{p}{\omega_n}$
$X = \frac{F_0 k}{p^2}$

Correct Answer Logic:

The particular solution amplitude is $X=\frac{F_0/k}{1-(p/\omega_n)^2}=\frac{x_{st}}{1-(p/\omega_n)^2}$. As $p\to\omega_n$, $X\to\infty$ (resonance).

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Economics QUESTION #1694

Question 168

Among the following, which one is categorically NOT a component of Gross Domestic Product (GDP) calculated by the expenditure approach?

Consumption expenditure by households
Gross private domestic investment by firms
Government purchases of goods and services
The prevailing rate of unemployment✔️

Correct Answer Logic:

The expenditure approach to GDP is: $\text{GDP} = C + I + G + (X - M)$, where $C$ = household consumption, $I$ = gross private investment, $G$ = government purchases, and $(X-M)$ = net exports. The rate of unemployment is a labour market indicator and is not a component of GDP. It may be correlated with GDP (via Okun's Law) but is not included in its calculation.

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General Abilities QUESTION #2815

Question 169

The average marks of 30 students is 65. If 5 more students with an average of 75 join the class, what is the new average?

66.43
66.67✔️
67.14
68

Correct Answer Logic:

Old total $= 30 \times 65 = 1950$. New total $= 1950 + 5 \times 75 = 1950 + 375 = 2325$. New average $= \dfrac{2325}{35} = 66.43 \approx 66.43$. Exact: $\dfrac{2325}{35} = 66.43$.

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Chemistry QUESTION #1102

Question 170

Which one of the following compounds does NOT decolourize bromine water?

Styrene (vinyl benzene)
Aniline
Cyclohexane✔️
Phenol

Correct Answer Logic:

Bromine water is decolourized by compounds with C=C double bonds, –NH$_2$ groups, or –OH (phenol) through electrophilic addition or substitution. Styrene (C=C) — decolourizes ✓. Aniline (–NH$_2$ activates ring) — decolourizes ✓. Cyclohexane — saturated, no functional group → does NOT decolourize ✗. Phenol — activated ring, decolourizes ✓.

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Paper-I (Anatomy/Physiology and Biochemistry/Microbiology) QUESTION #3139

Question 171

Which gland requires 'Iodine' to produce its hormones?

Adrenal gland
Thyroid gland✔️
Pancreas
Thymus

Correct Answer Logic:

The thyroid uses iodine to make $T_3$ and $T_4$.

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Boilers Mechanical Engineering QUESTION #2503

Question 172

A simply supported beam with uniformly distributed load $w$ (N/m) over span $L$ has a maximum bending moment of:

$M_{max} = \frac{wL}{8}$
$M_{max} = \frac{wL^2}{4}$
$M_{max} = \frac{wL^2}{8}$✔️
$M_{max} = \frac{wL^2}{2}$

Correct Answer Logic:

For a simply supported beam with UDL $w$ over span $L$: the maximum bending moment occurs at mid-span and equals $M_{max} = wL^2/8$.

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Biology QUESTION #7238

Question 173

Moss peat is used as a packing material for sending flowers and live plants to distant places because:

It reduces transpiration
It serves as a disinfectant
It is easily available
It is hygroscopic✔️

Correct Answer Logic:

Moss peat (mainly Sphagnum) is hygroscopic — it absorbs and retains large amounts of water. This keeps plants moist during transport. It can hold water up to 18–20 times its dry weight, making it ideal packing for live plant material.

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Mathematics QUESTION #965

Question 174

Let a line pass through two distinct points $P(-2,-1,3)$ and $Q$, and be parallel to the vector $3\hat{i}+2\hat{j}+2\hat{k}$. If the distance of the point $Q$ from the point $R(1,3,3)$ is 5, then the square of the area of $\triangle PQR$ is equal to:

148
136
144
140✔️

Correct Answer Logic:

The line through $P$ parallel to $\vec{v}=3\hat{i}+2\hat{j}+2\hat{k}$ gives $Q = P + t\vec{v}$. Using $|QR|=5$ to find $t$, then computing $\text{Area}^2 = \frac{1}{2}|\vec{PQ}\times\vec{PR}|^2$ yields 140.

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Islamic Studies QUESTION #340

Question 175

Which Caliph was the first to set the punishment for drinking at eighty lashes?

Hazrat Ali
Hazrat Usman
Hazrat Umar✔️
Hazrat Abu Bakr

Correct Answer Logic:

Hazrat Umar (RA) increased the punishment from 40 to 80 lashes after consultation with the Sahaba.

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Pharmacology and Toxicology QUESTION #3858

Question 176

Which of the following agents does NOT have antiemetic properties?

Chlorpromazine
Domperidone
Oxybutynin✔️
Metoclopramide

Correct Answer Logic:

Oxybutynin is an anticholinergic agent used for urinary incontinence and has no antiemetic role. Chlorpromazine, domperidone, and metoclopramide are all recognised antiemetics.

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CISA QUESTION #6835

Question 177

An organization conducts business impact analysis and assigns Recovery Point Objective (RPO) of 1 hour but performs full backups only weekly with no incremental backups. What is the MAXIMUM potential data loss?

1 hour
168 hours (1 week)✔️
24 hours
Unknown

Correct Answer Logic:

RPO defines maximum acceptable data loss, while backup frequency determines actual potential data loss. Weekly backups mean up to 1 week of data could be lost in a disaster. The gap between 1-hour RPO requirement and weekly backup capability represents a critical mismatch between business requirements and technical implementation.

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General Knowledge QUESTION #7719

Question 178

In which province Kabul river is located?

KPK✔️
Balochistan
Sindh
None of these

Correct Answer Logic:

The Kabul River flows through Khyber Pakhtunkhwa (KPK) province of Pakistan. It originates in Afghanistan and enters Pakistan through KPK, eventually joining the Indus River at Attock. It is a major river in the region.

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Urdu QUESTION #5281

Question 179

ادب تنقید حیات ہے، یہ کس کے الفاظ ہیں؟

میتھیو آرنلڈ✔️
William Powell
Grayson Carter
کوئی نہیں

Correct Answer Logic:

ادب تنقید حیات ہے (Literature is a criticism of life) یہ مشہور قول میتھیو آرنلڈ کا ہے۔

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Psychology QUESTION #1464

Question 180

Which of the following is an example of a projective psychological test?

The Wechsler Intelligence Scale for Children (WISC)
The Minnesota Multiphasic Personality Inventory (MMPI)
The Rorschach Inkblot Test✔️
The Stanford-Binet Intelligence Scale

Correct Answer Logic:

The Rorschach Inkblot Test is a classic projective test in which individuals describe what they see in ambiguous inkblots — their responses are thought to reveal unconscious thoughts, feelings, and personality characteristics. Projective tests use ambiguous stimuli to 'project' inner states. WISC and Stanford-Binet are intelligence tests; MMPI is an objective (self-report) personality inventory.

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