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Math Physics Chemistry Biology QUESTION #7757

Which neurotransmitter is hydrolyzed by the enzyme monoamine oxidase (MAO)?

Acetylcholine
Adrenaline
Glutamate
Serotonin✔️

Correct Answer Logic:

MAO breaks down monoamine neurotransmitters: dopamine, serotonin (5-HT), adrenaline, noradrenaline. Acetylcholine is broken down by acetylcholinesterase; glutamate is not a monoamine.

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Chemistry QUESTION #5575

Question 1322

In Cannizzaro's reaction of trichloroacetaldehyde ($CCl_3CHO$) with NaOH, one product is sodium trichloroacetate. What is the other product?

Trichloromethanol
2,2,2-Trichloropropanol
Chloroform
2,2,2-Trichloroethanol✔️

Correct Answer Logic:

Cannizzaro reaction involves disproportionation of a non-enolizable aldehyde. $2CCl_3CHO + NaOH \to CCl_3COO^-Na^+\ (\text{sodium trichloroacetate}) + CCl_3CH_2OH\ (2{,}2{,}2\text{-trichloroethanol})$. One molecule is oxidized to the acid salt and the other is reduced to the alcohol.

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Math Physics Chemistry Biology QUESTION #7781

Question 1323

The plasma membrane is selectively permeable mainly due to the presence of:

Carbohydrates
Lipids
Proteins✔️
Vitamins

Correct Answer Logic:

Integral membrane proteins (e.g., channels, carriers, pumps) control selective transport. Lipids form the barrier but without proteins, permeability is limited to small nonpolar molecules.

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Mathematics QUESTION #968

Question 1324

The area of the region enclosed by the curves $y = x^2 - 4x + 4$ and $y^2 = 16 - 8x$ is:

$\dfrac{8}{3}$✔️
$\dfrac{4}{3}$
8
5

Correct Answer Logic:

Rewrite: $y=(x-2)^2$ (parabola) and $y^2=8(2-x)$ (leftward parabola). Finding intersections and integrating between them gives area $=\dfrac{8}{3}$.

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English QUESTION #2732

Question 1325

Change to PASSIVE VOICE: 'The teacher teaches the students.'

The students were taught by the teacher.
The students are taught by the teacher.✔️
The students teach the teacher.
The students have been taught by the teacher.

Correct Answer Logic:

In passive voice for simple present: Subject + is/am/are + past participle + by + agent. 'The students are taught by the teacher' correctly converts the active voice sentence.

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English QUESTION #2726

Question 1326

Which sentence is in the SIMPLE PRESENT TENSE?

She was reading a book.
He will play football.
They eat lunch at noon.✔️
I had completed my work.

Correct Answer Logic:

The simple present tense is used for habits

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Islamic Studies QUESTION #8251

Question 1327

Which Surah is called "Ummul Kitab"?

Al-Baqra
Al-Yasin
Al-Fateha✔️
Al-Rehman

Correct Answer Logic:

Surah Al-Fatiha is called 'Ummul Kitab' (Mother of the Book) and also 'Ummul Quran' (Mother of the Quran). It is the opening Surah of the Quran with 7 verses, also known as 'As-Sab'ul Mathani' (The Seven Oft-Repeated Verses). It is recited in every unit of prayer (Salah) and encompasses the essence of the entire Quran: praising Allah, seeking guidance, and asking for the straight path. The Prophet (PBUH) called it the greatest Surah in the Quran.

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Paper-I (Anatomy/Physiology and Biochemistry/Microbiology) QUESTION #3087

Question 1328

Which hormone increases blood calcium levels by stimulating bone resorption by osteoclasts?

Calcitonin
Parathyroid Hormone (PTH)✔️
Insulin
Thyroxine

Correct Answer Logic:

PTH increases calcium in the blood by breaking down bone matrix.

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Paper-I (Anatomy/Physiology and Biochemistry/Microbiology) QUESTION #3397

Question 1329

Which vitamin is 'Fat-Soluble' and essential for blood clotting?

Vitamin B12
Vitamin C
Vitamin K✔️
Vitamin A

Correct Answer Logic:

Vitamins A, D, E, and K are fat-soluble; B and C are water-soluble.

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Maths QUESTION #4636

Question 1330

What is $\frac{3^4}{3^2}$?

$3^2$✔️
$3^6$
$3^8$
$1$

Correct Answer Logic:

$\frac{3^4}{3^2} = 3^{4-2} = 3^2 = 9$

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Agronomy QUESTION #2030

Question 1331

Crop rotation is defined as the practice of:

Growing the same high-yielding crop continuously on the same land to maximize production
Growing different crops on the same land in a preplanned sequence over successive seasons or years✔️
Intercropping two or more crops simultaneously in the same field
Rotating irrigation schedules among fields in a farm

Correct Answer Logic:

Crop rotation involves growing different crop species on the same piece of land in a defined sequence over time. Benefits include breaking pest and disease cycles, improving soil fertility (especially with legumes), reducing weed pressure, improving soil structure, and distributing labor and market risks.

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Chemistry QUESTION #1427

Question 1332

The heat capacity of a calorimeter is determined using:

A bomb calorimeter
A known standard material✔️
Adiabatic temperature rise
None of these

Correct Answer Logic:

The heat capacity (calorimeter constant) of a calorimeter is determined by calibration using a known standard material — typically a substance with a well-characterised heat of combustion (e.g., benzoic acid). A known amount is burned/reacted, the temperature change is measured, and the calorimeter constant $C_{\text{cal}} = q / \Delta T$ is calculated.

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Paper-II (Pharmacognosy and Pharmaceutics-I) QUESTION #3009

Question 1333

Which of the following is a 'Flocculating Agent' used in suspensions?

Electrolytes
Surfactants
Polymers
All of these✔️

Correct Answer Logic:

Electrolytes, surfactants, and polymers can all be used to form 'flocs' to improve suspension stability.

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The Constitution of Pakistan QUESTION #9363

Question 1334

Under Article 63A(3)-(4), after the Presiding Officer refers a defection declaration to the Chief Election Commissioner, within how many days must the Election Commission decide?

Fifteen days
Thirty days✔️
Sixty days
Ninety days

Correct Answer Logic:

Article 63A(3) requires the Presiding Officer to refer within two days (deemed referred if not done). The Chief Election Commissioner then places it before the Election Commission which must decide within 30 days. An appeal against the Election Commission's decision lies to the Federal Constitutional Court, which decides within 90 days.

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Dairy Food Science and Technology QUESTION #5876

Question 1335

In yoghurt fermentation, $S.\; thermophilus$ and $L.\; bulgaricus$ exhibit a symbiotic relationship. Which statement correctly describes this?

Both organisms produce only lactic acid independently
$S.\; thermophilus$ produces $\text{CO}_2$ stimulating $L.\; bulgaricus$; $L.\; bulgaricus$ produces amino acids stimulating $S.\; thermophilus$
$L.\; bulgaricus$ grows first and lowers $\text{pH}$ enabling $S.\; thermophilus$
$S.\; thermophilus$ produces formic acid and $\text{CO}_2$ stimulating $L.\; bulgaricus$; $L.\; bulgaricus$ proteolysis releases peptides stimulating $S.\; thermophilus$ growth✔️

Correct Answer Logic:

This is protocooperation: $S.\; thermophilus$ grows first producing formic acid and $\text{CO}_2$ stimulating $L.\; bulgaricus$. $L.\; bulgaricus$ then produces protease activity releasing peptides and amino acids (valine, histidine) that stimulate further $S.\; thermophilus$ growth.

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Biology Zoology Botany QUESTION #10771

Question 1336

Minerals required by the body in relatively large amounts are called:

Macrominerals✔️
Non-Essential minerals
Trace minerals
Microminerals

Correct Answer Logic:

Macrominerals (major minerals) are required in amounts greater than 100 mg/day. They include calcium (Ca), phosphorus (P), magnesium (Mg), sodium (Na), potassium (K), chloride (Cl), and sulfur (S). In contrast, trace minerals (microminerals) are needed in amounts less than 100 mg/day and include iron, zinc, copper, iodine, selenium, and manganese.

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Accounting & Finance QUESTION #6095

Question 1337

Under what condition would factory overheads be considered 'over absorbed'?

The amount absorbed is less than the budgeted overheads.
The amount absorbed is greater than the budgeted overheads.
The actual overheads incurred are less than the amount absorbed.✔️
The actual overheads incurred are greater than the amount absorbed.

Correct Answer Logic:

Over absorption occurs when the overhead absorbed (Rate $\times$ Actual Activity) is higher than the actual overheads incurred.

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Education QUESTION #11685

Question 1338

Under the National Education Policy of 1972, free education was recommended up to which class?

Class 5
Class 12
Class 10✔️
None of these

Correct Answer Logic:

The National Education Policy 1972 recommended free education up to Class 10 (Matriculation level). This was a progressive recommendation intended to democratize education and reduce financial barriers for students from lower-income families.

Correct Answer: C — Class 10.

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