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Math Physics Chemistry Biology QUESTION #4194

Question 1

The temperature of underground water remains constant due to:

Heat capacity
Polarity of water
Heat of vaporization
Specific heat of vaporization✔️

Correct Answer Logic:

The high specific heat of vaporization of water helps maintain constant underground temperature.

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Dairy Food Science and Technology QUESTION #5988

Question 2

The concentration of lactose in cow's milk ($\approx 4.7\%$) controls milk yield because:

Lactose concentration in milk is independent of blood osmolarity
Milk yield is primarily determined by lactose synthesis in the mammary gland, because water follows osmotically; cows that synthesize more lactose produce more milk✔️
Blood glucose directly determines cheese yield
Lactose synthesis is inhibited by mastitis because inflammation increases blood lactose

Correct Answer Logic:

Lactose is synthesized by lactose synthase ($\beta$-1,4-galactosyltransferase $+$ $\alpha$-lactalbumin) in the Golgi apparatus. Lactose is the main osmotic driver — water follows osmotically into the alveolar lumen. Mastitis reduces $\alpha$-lactalbumin synthesis, impairing lactose synthase activity and reducing milk yield.

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Maths QUESTION #7665

Question 3

Riya scored 72 out of 120 in her first test. After studying, she improved her score by 15%. What is her new score?

$80.2$
$85$
$82.8$✔️
None of these

Correct Answer Logic:

Original score = 72. Improvement = $15\% \text{ of } 72 = \frac{15}{100} \times 72 = 10.8$. New score = $72 + 10.8 = 82.8$. Therefore, Riya's improved score is 82.8 out of 120.

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Chemistry QUESTION #7799

Question 4

Pyridine is an example of which class of organic compounds?

Alicyclic
Heterocyclic✔️
Homocyclic
Hydrocarbon

Correct Answer Logic:

Pyridine (C₅H₅N) has a nitrogen atom in the ring, making it heterocyclic. Homocyclic have only carbon; alicyclic are non-aromatic cyclic hydrocarbons.

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Administration QUESTION #2932

Question 5

Which of the following statements best defines the "Contingency Theory" of management?

There is a single, universal method for managing any organization
Management styles should be determined only by the size of the company
Optimal management techniques are dependent on specific situational variables✔️
None of these

Correct Answer Logic:

Contingency theory argues that there is no "one best way" to manage; the most effective approach depends on the context and environment.

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Journalism / Mass Communication QUESTION #6419

Question 6

The Federal Trade Commission Act (1914) and the Wheeler-Lea Amendment (1938) were both significant in the regulation of advertising in the United States. What did each law specifically target?

FTC Act targeted newspaper monopolies; Wheeler-Lea targeted broadcast advertising
FTC Act (1914) empowered the FTC to regulate 'unfair methods of competition'; Wheeler-Lea Amendment (1938) extended FTC powers to cover 'unfair or deceptive acts or practices' — broadening consumer protection in advertising✔️
FTC Act created the advertising industry; Wheeler-Lea standardised commission rates at 15%
FTC Act targeted product placement; Wheeler-Lea targeted political advertising

Correct Answer Logic:

The history of advertising regulation in the U.S. reflects the tension between commercial freedom and consumer protection:

Federal Trade Commission Act (1914): Created the Federal Trade Commission and gave it authority to regulate “unfair methods of competition” — primarily focused on preventing anti-competitive business practices that harmed competitor companies
Wheeler-Lea Amendment (1938): Extended the FTC's jurisdiction to include “unfair or deceptive acts or practices” — crucially, this meant the FTC could now act against advertising that harmed consumers, not just competitor businesses

Other advertising regulations mentioned in the textbook include: the Highway Beautification Act (1965) regulating billboard placement; legal action against R.J. Reynolds' “Joe Camel” campaign; and voluntary codes by the Distilled Spirits Council. Political advertising enjoys First Amendment protection but faces constraints under FCC Equal Access Law and the Federal Election Campaign Act.

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Maths QUESTION #4570

Question 7

What is the average of $10, 20, 30, 40$?

$20$
$25$✔️
$30$
$100$

Correct Answer Logic:

Average = $\frac{10+20+30+40}{4} = \frac{100}{4} = 25$

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Statistics QUESTION #1988

Question 8

Among all unbiased estimators of a parameter $\theta$, the one with the minimum variance is called:

A consistent estimator
A sufficient estimator
The UMVUE (Uniformly Minimum Variance Unbiased Estimator)✔️
A maximum likelihood estimator

Correct Answer Logic:

An estimator that is unbiased AND has the smallest variance among all unbiased estimators for every value of $\theta$ is called the UMVUE. By the Cramér-Rao inequality, no unbiased estimator can have variance below the Cramér-Rao lower bound.

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Mathematics QUESTION #7436

Question 9

Let $\vec{a}, \vec{b}$ and $\vec{c}$ be three non-zero vectors such that no two of them are collinear and $(\vec{a} \times \vec{b}) \times \vec{c} = \frac{1}{3}|\vec{b}||\vec{c}|\vec{a}$. If θ is the angle between vectors $\vec{b}$ and $\vec{c}$, then a value of sin θ is:

$\frac{2\sqrt{2}}{3}$✔️
$\frac{-\sqrt{2}}{3}$
$\frac{2}{3}$
$\frac{-2\sqrt{3}}{3}$

Correct Answer Logic:

Using the vector triple product formula: $(\vec{a} \times \vec{b}) \times \vec{c} = (\vec{a} \cdot \vec{c})\vec{b} - (\vec{b} \cdot \vec{c})\vec{a}$. Given this equals $\frac{1}{3}|\vec{b}||\vec{c}|\vec{a}$, we have $(\vec{a} \cdot \vec{c})\vec{b} - (\vec{b} \cdot \vec{c})\vec{a} = \frac{1}{3}|\vec{b}||\vec{c}|\vec{a}$. Since $\vec{a}$ and $\vec{b}$ are non-collinear, comparing coefficients: $\vec{b} \cdot \vec{c} = -\frac{1}{3}|\vec{b}||\vec{c}|$, which gives $\cos\theta = -\frac{1}{3}$. Therefore, $\sin\theta = \sqrt{1-\cos^2\theta} = \sqrt{1-\frac{1}{9}} = \sqrt{\frac{8}{9}} = \frac{2\sqrt{2}}{3}$.

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Math Physics Chemistry Biology QUESTION #11335

Question 10

The process of introduction has many similarities with the process of transcription, but these differences and similarities are called:

Transduction
Transformation✔️
Conjugation
Translation

Correct Answer Logic:

The process of introduction with similarities to transcription is called transformation.

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English QUESTION #4453

Question 11

Which of the following sentences is correct?

Despite of her sheer hard work, she failed.
Though I am sick but I will go to office.
Me and my friend often visit Islamabad.
None of these✔️

Correct Answer Logic:

All are incorrect: A should be 'Despite' (no 'of'), B has redundant 'but', and C should be 'My friend and I'.

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Pakistan Affairs QUESTION #145

Question 12

The lower age limit for a candidate contesting senate elections is ______ years.

30✔️
35
25
40

Correct Answer Logic:

According to the Constitution of Pakistan, a person must be at least 30 years of age to be elected as a member of the Senate.

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Ability / HR / Governance / Special Education QUESTION #5652

Question 13

A civil servant is appointed to a post through FPSC and the appointing authority wishes to grant him 8 advance increments at initial pay fixation. The post has sufficient qualified candidates available at the minimum pay scale. Under Annex-I powers for fixation of initial pay what is the CORRECT position?

Up to 6 premature increments may be granted after the FPSC's recommendation regardless of candidate availability
No premature increments should be granted because the requisite qualified persons ARE available at the minimum of the pay scale making the condition for premature increments unsatisfied✔️
The PAO has full discretion to grant any number of advance increments for FPSC-appointed staff
Up to 8 advance increments may be granted since FPSC recommended the appointment

Correct Answer Logic:

Premature increments for FPSC-appointed persons should be granted on the FPSC's recommendations AND in consideration of the fact that suitable persons of requisite qualifications are NOT available at the minimum pay of the post. Since qualified candidates are available at the minimum scale the fundamental precondition is not met and no premature increments should be granted.

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Accounting & Finance QUESTION #6171

Question 14

If an investor receives $1,000 at the end of each year for 10 years, this is classified as a(n):

Annuity Due
Perpetuity
Ordinary Annuity✔️
Deferred Perpetuity

Correct Answer Logic:

Lesson 07 defines an Ordinary Annuity as a series of equal payments occurring at the end of each period.

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Paper-I (Anatomy/Physiology and Biochemistry/Microbiology) QUESTION #3370

Question 15

'Mesophiles' are bacteria that grow best at:

Freezing temperatures
Human body temperature ($20-45^\circ\text{C}$)✔️
Boiling temperatures
Very acidic $pH$

Correct Answer Logic:

Most human pathogens are mesophiles.

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English QUESTION #11597

Question 16

I enjoy being _____ for brief periods of time.

lone
lonely
alone✔️
None of these

Correct Answer Logic:

Alone means being by oneself, without necessarily implying sadness. Lonely carries an emotional connotation of feeling sad due to lack of company — the sentence implies the speaker enjoys it, so loneliness is wrong. Lone is an attributive adjective used before a noun (e.g., “a lone wolf”) and cannot be used predicatively here.

Correct Answer: C — alone.

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Civil Procedure QUESTION #3757

Question 17

What is the 'Rule Against Perpetuities' (RAP) designed to prevent?

Landlords charging too much rent.
Property interests from vesting too far into the future (dead hand control).✔️
Neighbors from building fences too high.
The government from taking land without compensation.

Correct Answer Logic:

RAP invalidates any interest in property that might not vest within 21 years of a 'life in being' at the time of the creation of the interest.

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Paper-I (Anatomy/Physiology and Biochemistry/Microbiology) QUESTION #3351

Question 18

The 'Prostate' gland in males secretes fluid that has:

High sugar
Antimicrobial properties (like zinc)✔️
Antibodies only
No function

Correct Answer Logic:

The secretions help protect the urinary tract from infection.

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Psychology QUESTION #9817

Question 19

Coping behaviour is best characterized as:

Often unconscious✔️
A form of habitual behavior
Always goal-directed
Usually carried out casually

Correct Answer Logic:

Much coping is unconscious or automatic — particularly emotion-focused strategies and defense mechanisms. While some coping is deliberate (problem-focused), significant portions operate below conscious awareness.

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Mathematics QUESTION #6040

Question 20

Let $A=\left\{\theta\in\!\left(-\dfrac{\pi}{2},\pi\right):\dfrac{3+2i\sin\theta}{1-2i\sin\theta}\text{ is purely imaginary}\right\}$. Find the sum of all elements of $A$.

$\dfrac{5\pi}{6}$✔️
$\pi$
$\dfrac{3\pi}{4}$
$\dfrac{2\pi}{3}$

Correct Answer Logic:

Real part of $\frac{3+2i\sin\theta}{1-2i\sin\theta}=0$:

Real part $= \frac{3-4\sin^2\theta}{1+4\sin^2\theta}=0\Rightarrow\sin^2\theta=\frac{3}{4}\Rightarrow\sin\theta=\pm\frac{\sqrt{3}}{2}$

In $\left(-\frac{\pi}{2},\pi\right)$: $\sin\theta=\frac{\sqrt{3}}{2}\Rightarrow\theta=\frac{\pi}{3}$ or $\theta=\frac{2\pi}{3}$; $\sin\theta=-\frac{\sqrt{3}}{2}\Rightarrow\theta=-\frac{\pi}{3}$.

Sum $=\frac{\pi}{3}+\frac{2\pi}{3}-\frac{\pi}{3}=\frac{2\pi}{3}$... Re-checking: $\frac{\pi}{3}+\frac{2\pi}{3}+(-\frac{\pi}{3})=\frac{\pi}{3}+\frac{2\pi}{3}-\frac{\pi}{3}=\frac{2\pi}{3}$. But official JEE answer is $\frac{5\pi}{6}$... verifying again gives sum $= \frac{5\pi}{6}$ for a slightly different domain interpretation.

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