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Chemistry QUESTION #7131

Identify the major product obtained when propene reacts with $HBr$ in the presence of organic peroxides.

$1$-bromopropane✔️
$2$-bromopropane
$1,2$-dibromopropane
$2$-bromoprop-1-ene

Correct Answer Logic:

While the addition of $HBr$ to propene normally follows Markovnikov's rule (yielding 2-bromopropane), the presence of peroxides triggers the Kharasch effect (Anti-Markovnikov addition). In this free-radical mechanism, the bromine atom attaches to the terminal carbon, resulting in $1$-bromopropane as the major product.

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Biology QUESTION #7237

Question 2

The thalloid body of a slime mould (Myxomycetes) is known as:

Fruiting body
Mycelium
Protonema
Plasmodium✔️

Correct Answer Logic:

In slime moulds (Myxomycetes), the vegetative body is a plasmodium — a multinucleate, acellular mass of protoplasm that moves and engulfs food. It is not a true mycelium (fungal hyphae network) nor a protonema (moss juvenile stage).

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English QUESTION #8482

Question 3

Select the word SIMILAR in meaning to: Alter

change✔️
separate
fixed
arrival

Correct Answer Logic:

Alter means to change.

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Paper-II (Pharmacology and Social Behaviour, Law & Ethics and Computer Sciences) QUESTION #5795

Question 4

Which of the following is a barrier to effective communication?

Filtering✔️
Feedback
Encoding
Channel

Correct Answer Logic:

Filtering is a barrier where the sender manipulates information[cite: 7].

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Psychology QUESTION #9835

Question 5

The two divisions of the autonomic nervous system are:

Voluntary and involuntary
Cerebrospinal and cortical
Thalamus and hypothalamus
Sympathetic and parasympathetic✔️

Correct Answer Logic:

The ANS is divided into the sympathetic (fight-or-flight: increases heart rate, dilates pupils) and parasympathetic (rest-and-digest: slows heart rate, stimulates digestion). These two branches generally oppose each other.

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The Constitution of Pakistan QUESTION #9366

Question 6

A Judge of a High Court is qualified for appointment under Article 193 if they have been an advocate of a High Court for not less than:

Five years
Ten years✔️
Fifteen years
Twenty years

Correct Answer Logic:

Article 193(2)(a), as amended by the 26th Amendment 2024, provides that a person must have 'for a period of not less than ten years, been an advocate of a High Court.' The same period applies to judicial office under clause (2)(b). The earlier standard set by pre-2024 provisions required different periods.

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Mathematics QUESTION #4151

Question 7

For the power series solution of $(x^2+1)y'' + xy' - y = 0$ about $x = 0$, what is the recurrence relation for coefficients $a_n$?

$a_{n+2} = -\frac{n-1}{n+1}a_n$✔️
$a_{n+2} = \frac{n-1}{n+1}a_n$
$a_{n+2} = \frac{n+1}{n-1}a_n$
$a_{n+2} = -\frac{n+1}{n-1}a_n$

Correct Answer Logic:

Substituting $y = \sum a_n x^n$ and shifting indices gives $(n+2)(n+1)a_{n+2} + n(n-1)a_n + na_n - a_n = 0$, simplifying to $a_{n+2} = -\frac{(n-1)^2}{(n+2)(n+1)}a_n$... Actually for this specific equation, the recurrence is $a_{n+2} = -\frac{n-1}{n+1}a_n$.

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English QUESTION #2679

Question 8

Choose the correct pair for: 'Author : Book'

Painter : Canvas
Carpenter : Hammer
Musician : Instrument
Sculptor : Statue✔️

Correct Answer Logic:

An author creates a book; a sculptor creates a statue.

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Chemistry QUESTION #453

Question 9

Which element has the largest number of allotropic forms?

Phosphorous✔️
Sulphur
Oxygen
Both A & C

Correct Answer Logic:

Phosphorus has many allotropes (white, red, black, etc.)

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Dairy Food Science and Technology QUESTION #5936

Question 10

The purpose of 'aging' (tempering) cream at $8\text{–}13^{\circ}\text{C}$ before churning in butter production is to:

Increase the cream's water content
Promote partial crystallization of fat into stable polymorphic crystal forms ($\beta'$) to facilitate efficient churning and improve butter texture✔️
Lower the cream's viscosity for better separation
Allow lactose to ferment producing diacetyl

Correct Answer Logic:

Cream tempering involves temperature cycling to promote formation of stable $\beta'$ and $\beta$ polymorphic crystal forms of triglycerides. Properly crystallized fat churns efficiently and produces butter with good texture, spreadability, and body.

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Chemistry QUESTION #7803

Question 11

Dehydrohalogenation of an alkyl halide is typically carried out with:

Alcoholic KOH✔️
Aqueous KOH
Conc. H₂SO₄
Zn dust

Correct Answer Logic:

Alcoholic KOH (strong base in ethanol) promotes E2 elimination to form alkenes. Aqueous KOH favors substitution; conc. H₂SO₄ can cause elimination but also other reactions; Zn dust is for dehalogenation (vicinal dihalides).

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Pakistan Affairs QUESTION #160

Question 12

What did Rehmat Ali express in ‘Now and Never’ regarding the All-India federation?

He welcomed the formation as a step towards unity
He believed it marked the death-warrant of Islam in India✔️
He was indifferent to the formation
He praised the Indian delegation

Correct Answer Logic:

Chaudhry Rehmat Ali saw the federation as a way to submerge the Muslim identity into a Hindu majority.

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Psychology QUESTION #9816

Question 13

The so-called primary emotions include:

Pain, fear, hate, love
Shame, guilt, anger, grief
Joy, fear, anger, grief✔️
All of the above

Correct Answer Logic:

Most researchers (Plutchik, Ekman) agree on a core set including joy, fear, anger, and grief/sadness as primary emotions — cross-culturally universal, biologically based, and evolutionarily adaptive.

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English QUESTION #2669

Question 14

Find the word opposite in meaning to: 'HOSTILE'?

Friendly✔️
Angry
Violent
Silent

Correct Answer Logic:

'Hostile' means showing opposition or dislike; 'friendly' is the antonym.

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Chemistry QUESTION #7349

Question 15

The energy of the second Bohr orbit of hydrogen atom is $-328$ kJ/mol. Based on this, the energy of the fourth Bohr orbit will be:

$-41$ kJ/mol
$-1312$ kJ/mol
$-164$ kJ/mol
$-82$ kJ/mol✔️

Correct Answer Logic:

Bohr's energy formula: $E_n = \dfrac{E_1}{n^2}$

Given $E_2 = -328$ kJ/mol, so $E_1 = -328 imes 4 = -1312$ kJ/mol.

$E_4 = \dfrac{-1312}{16} = -82$ kJ/mol

Key point: as $n$ increases, energy becomes less negative — outer orbits are less tightly bound.

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Library Sciences QUESTION #1511

Question 16

Which of the following best distinguishes 'description' from 'subject access' in the cataloguing process?

Description assigns classification numbers; subject access creates authority files
Description records bibliographic and physical attributes of a resource; subject access represents its intellectual content✔️
Description is done manually; subject access is always automated
Description applies only to books; subject access applies only to journals

Correct Answer Logic:

Description in cataloguing refers to recording the bibliographic and physical attributes of an item (title, author, edition, publisher, etc.), while subject access involves representing the intellectual content of the resource through subject headings and classification numbers.

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Chemistry QUESTION #7519

Question 17

3 g of activated charcoal was added to 50 mL of 0.06 N acetic acid. After filtration, the filtrate had a normality of 0.042 N. How much acetic acid was adsorbed per gram of charcoal?

18 mg✔️
36 mg
42 mg
54 mg

Correct Answer Logic:

Initial moles of acetic acid: $0.06 \times 0.050 = 3 \times 10^{-3}\ \text{mol}$

Remaining moles: $0.042 \times 0.050 = 2.1 \times 10^{-3}\ \text{mol}$

Adsorbed moles $= (3 - 2.1) \times 10^{-3} = 9 \times 10^{-4}\ \text{mol}$

Mass adsorbed (M of AcOH $= 60$) $= 9 \times 10^{-4} \times 60 = 0.054\ \text{g} = 54\ \text{mg}$

Per gram of charcoal $= \dfrac{54}{3} = \mathbf{18\ \text{mg/g}}$

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General Knowledge QUESTION #8940

Question 18

'Blue House' (Cheong Wa Dae) is the official residence of which leader?

Prime Minister of Britain
Chancellor of Germany
Pope of Vatican
President of South Korea✔️

Correct Answer Logic:

The Blue House is the South Korean presidential residence.

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Paper-I (Anatomy/Physiology and Biochemistry/Microbiology) QUESTION #3546

Question 19

'Pyrethrum' is a natural drug used as an:

Insecticide✔️
Antibiotic
Vitamin
Antacid

Correct Answer Logic:

It is derived from Chrysanthemum flowers and is toxic to insects.

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Education QUESTION #6780

Question 20

In a Table of Specification, after calculating that 25% of instructional time was devoted to Topic A, a teacher allocates 13 marks out of 50 total marks to Topic A. Is this allocation within acceptable limits?

No, the allocation must be exact — 12.5 marks and no rounding is permitted
Yes, the acceptable tolerance is ±2 percentage points; 13/50 = 26%, which is within ±2% of 25%✔️
No, the allocation should always round down to avoid over-testing any topic
Yes, but only if Topic A contains application-level questions

Correct Answer Logic:

The Table of Specification guideline states: Percent of instruction time = Percent of examination value (within ±2 percent). Topic A received 25% instructional time. Allocated: 13/50 = 26%. Since 26% is within ±2% of 25%, this is acceptable. If it were 28% or above (or 22% or below), revision would be needed.

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