Reading Mode - Questions

Mathematics QUESTION #7443

If $m$ is the A.M. of two distinct real numbers $\ell$ and $n$ ($\ell, n > 1$) and $G_1, G_2$ and $G_3$ are three geometric means between $\ell$ and $n$, then $G_1^4 + 2G_2^4 + G_3^4$ equals:

$4\ell^2 mn$
$4\ell m^2n$✔️
$4\ell mn^2$
$4\ell^2m^2n^2$

Correct Answer Logic:

We have $m = \frac{\ell+n}{2}$. For three geometric means between $\ell$ and $n$, we have $\ell, G_1, G_2, G_3, n$ in G.P. The common ratio is $r = (\frac{n}{\ell})^{1/4}$. Thus $G_1 = \ell r = \ell(\frac{n}{\ell})^{1/4}$, $G_2 = \ell r^2 = \ell\sqrt{\frac{n}{\ell}} = \sqrt{\ell n}$, $G_3 = \ell r^3 = \ell(\frac{n}{\ell})^{3/4}$. We get $G_2^2 = \ell n$ and $G_1 \cdot G_3 = \ell^2 r^4 = \ell n$. Therefore $G_1^4 + 2G_2^4 + G_3^4 = (G_1^2)^2 + 2(\ell n)^2 + (G_3^2)^2$. Using $G_1^2 + G_3^2 = (\ell r)^2 + (\ell r^3)^2 = \ell^2 r^2(1+r^4) = \ell^2(\frac{n}{\ell})^{1/2}(1+\frac{n}{\ell}) = \ell n^{1/2}(\frac{\ell+n}{\ell}) = n^{1/2}(\ell+n)$. After careful calculation, the answer is $4\ell m^2 n$.

Uploaded by: Fani Warraich

English QUESTION #2659

Question 7282

Convert to indirect: 'He said, "What a beautiful scene!"'

He said that it was a beautiful scene.
He exclaimed that it was a very beautiful scene.✔️
He exclaimed what a beautiful scene it was.
He said what a beautiful scene.

Correct Answer Logic:

Exclamatory sentences use 'exclaimed with joy/wonder' and change 'What a...' to 'very'.

Uploaded by: Fani Warraich

Paper-II (Pharmacognosy and Pharmaceutics-I) QUESTION #3653

Question 7283

Which of the following is a 'Purgative' drug?

Ginger
Senna✔️
Cinnamon
Clove

Correct Answer Logic:

Senna contains anthraquinones that stimulate bowel movement.

Uploaded by: Fani Warraich

Pakistan Affairs QUESTION #9039

Question 7284

In which constitution was Pakistan officially declared the 'Islamic Republic of Pakistan'?

1956 Constitution✔️
1962 Constitution
1973 Constitution
1975 Constitution

Correct Answer Logic:

The 1956 Constitution declared Pakistan an Islamic republic.

Uploaded by: Fani Warraich

Paper-I (Anatomy/Physiology and Biochemistry/Microbiology) QUESTION #3511

Question 7285

'Organoleptic' evaluation of a drug refers to evaluation by:

Chemical titration
Microscopic examination
Means of sense organs (color, odor, taste)✔️
Animal testing

Correct Answer Logic:

It is the simplest method using sight, smell, and touch.

Uploaded by: Fani Warraich

Paper-I (Anatomy/Physiology and Biochemistry/Microbiology) QUESTION #3392

Question 7286

The process of copying DNA into 'mRNA' is called:

Replication
Translation
Transcription✔️
Mutation

Correct Answer Logic:

Transcription occurs in the nucleus before the mRNA travels to the ribosome.

Uploaded by: Fani Warraich

Boilers Mechanical Engineering QUESTION #4082

Question 7287

'Boiler Log Book' is a legal and technical record used to:

Write poems
Track daily readings, maintenance, and water chemistry for safety/legal proof✔️
Record the weight of the operator
List the price of steam

Correct Answer Logic:

In the event of an accident, the log book is the first thing investigators look at.

Uploaded by: Fani Warraich

Molecular Biology / Bioinformatics / Biochemistry QUESTION #11122

Question 7288

During one complete turn of the Krebs (citric acid) cycle, the direct (substrate-level) ATP production per glucose molecule is:

2✔️
8
30
38

Correct Answer Logic:

The Krebs cycle produces 2 ATP per glucose molecule via substrate-level phosphorylation (1 GTP per acetyl-CoA turn × 2 turns per glucose = 2 GTP/ATP). The cycle primarily produces electron carriers: 6 NADH and 2 FADH₂ per glucose, which generate ~20–22 ATP via oxidative phosphorylation in the ETC. Total aerobic ATP yield per glucose is ~30–32 ATP. The question asks specifically for direct ATP production in the Krebs cycle itself, which is 2.

Uploaded by: Fani Warraich

Education QUESTION #6921

Question 7289

A counselor in a school observes a student who is progressively becoming withdrawn, listless, failing to gain weight, and showing signs of depression. According to social competence theory, which developmental factor is MOST likely implicated?

Excessive academic pressure without adequate recreational outlets
Severe deficiency in human interaction and social connections during early childhood development✔️
A mismatch between the school's hidden curriculum and the student's cultural background
Overexposure to competitive classroom environments that undermine self-esteem

Correct Answer Logic:

Social competence theory identifies early, sustained human interaction as foundational to a child's social-emotional thriving. Children who lack adequate interpersonal connection may fail to thrive physically and emotionally — becoming withdrawn, listless, and depressed. Schools and families share responsibility for nurturing these connections; their absence constitutes a developmental risk factor with direct behavioral and academic consequences.

Uploaded by: Fani Warraich

CISA QUESTION #1751

Question 7290

Which of the following is NOT a purpose of the ISO 15489 records management standard?

Define minimum legal handling requirements for data records
Provide a legal standard of negligence and culpability
Eliminate the need for a detailed classification list for each data set✔️
Define governance responsibilities across the data life cycle

Correct Answer Logic:

ISO 15489 defines the minimum handling process for records of value and requires an information classification system — a list of each data set to be protected. It does not eliminate the need for such a list; rather, it mandates one as a core governance control.

Uploaded by: Fani Warraich

Physics QUESTION #7000

Question 7291

A satellite orbits at height $h$ above Earth's surface (radius $R$; $h \ll R$). What is the minimum increase in orbital speed needed for the satellite to escape Earth's gravitational field? (Neglect atmosphere)

$\sqrt{gR}$
$\sqrt{gR/2}$
$\sqrt{gR}(\sqrt{2}-1)$✔️
$\sqrt{2gR}$

Correct Answer Logic:

For $h \ll R$, orbital radius $\approx R$.

Orbital velocity: $v_o = \sqrt{\frac{GM}{R}} = \sqrt{gR}$

Escape velocity from orbit at $R$: $v_e = \sqrt{\frac{2GM}{R}} = \sqrt{2gR}$

Minimum increase in speed:

$\Delta v = v_e - v_o = \sqrt{2gR} - \sqrt{gR} = \sqrt{gR}(\sqrt{2}-1)$

Uploaded by: Fani Warraich

Physics QUESTION #1039

Question 7292

Two cities X and Y connected by buses every T min. A girl on scooter at 60 km/h sees buses every 30 min in her direction and every 10 min opposite. Period T and bus speed:

10 min, 90 km/h
15 min, 120 km/h✔️
9 min, 40 km/h
25 min, 100 km/h

Correct Answer Logic:

Let bus speed $=v$, period $=T$. Relative speed with girl (same direction): $v-60$. Buses come every 30 min: $\frac{vT}{v-60}=30$. Opposite direction: $\frac{vT}{v+60}=10$. Dividing: $\frac{v+60}{v-60}=3\Rightarrow v+60=3v-180\Rightarrow v=120\ \text{km/h}$. Then $T=\frac{10(120+60)}{120}=15\ \text{min}$.

Uploaded by: Fani Warraich

Physics QUESTION #7855

Question 7293

Correct SI unit pair:

Energy-Newton
Force-Joule
Power-Watt✔️
Velocity-m/s²

Correct Answer Logic:

Power: watt (J/s). Energy: joule; Force: newton; Velocity: m/s.

Uploaded by: Fani Warraich

Math Physics Chemistry Biology QUESTION #4191

Question 7294

Sensory input from auditory and visual pathways, skin and within the body is received by ________ and distributed to________

Hypothalamus: Cerebellum
Thalamus: cerebrum✔️
Cerebrum: rest of the brain
Cerebellum: rest of the brain

Correct Answer Logic:

The thalamus receives sensory input and relays it to the cerebrum.

Uploaded by: Fani Warraich

Civil Engineering QUESTION #2122

Question 7295

The water-cement ratio in concrete mix design primarily governs:

The workability and unit weight of fresh concrete only
Both the compressive strength (inversely — lower w/c gives higher strength per Abrams' law) and durability (lower w/c reduces permeability, carbonation, and chloride ingress) — it is the single most important parameter in concrete mix design✔️
Only the setting time and heat of hydration
The aggregate-cement ratio and hence the modulus of elasticity

Correct Answer Logic:

Abrams' law: $f_c = \dfrac{K_1}{K_2^{w/c}}$. Strength decreases as w/c increases because excess water creates capillary pores on evaporation. Durability also decreases with higher w/c as the pore structure becomes more interconnected, allowing aggressive agents to penetrate. Maximum w/c ratios are specified in codes (e.g., 0.45 for moderate exposure in IS 456) — it governs both structural performance and service life.

Uploaded by: Fani Warraich

MCQs Section QUESTION #4893

Question 7296

A common disability in test pilots is hearing impairment, _____.

a consequence of sitting too close to large jet engines for long periods of time✔️
a consequence from sitting for long periods of time too near to large jet engines
a consequence which resulted from sitting too close to large jet engines for long periods of time
damaged from sitting too near to large jet engines for long periods of time

Correct Answer Logic:

It uses the concise and idiomatic appositive 'a consequence of + gerund phrase' to modify 'hearing impairment.' Option B uses the wrong preposition 'from.' Option C is redundant ('consequence which resulted'). Options D and E introduce 'damaged,' which cannot logically modify the noun 'hearing impairment.'

Uploaded by: Fani Warraich

English QUESTION #2741

Question 7297

What is the correct direct speech of: 'She told me that she had finished the work.'?

She said 'I finished the work.'
She said 'I have finished the work.'✔️
She said 'I had finished the work.'
She said 'I will finish the work.'

Correct Answer Logic:

When converting from indirect to direct speech, the past perfect 'had finished' goes back one step to present perfect 'have finished'. So 'I have finished the work' is correct.

Uploaded by: Fani Warraich

Reading and Writing (Module-1) QUESTION #10469

Question 7298

The regime's ------- rule left little room for -------, as any hint of criticism was swiftly silenced.

lenient . . obedience
despotic . . dissent✔️
benevolent . . loyalty
democratic . . debate

Correct Answer Logic:

A rule allowing no criticism is 'despotic,' leaving no room for 'dissent.'

Uploaded by: Fani Warraich

Chemistry QUESTION #1415

Question 7299

A reaction is exothermic if:

$\Delta H > 0$
$\Delta H < 0$✔️
$\Delta G > 0$
$\Delta G < 0$

Correct Answer Logic:

An exothermic reaction releases heat to the surroundings, meaning the enthalpy of the products is lower than that of the reactants. Therefore $\Delta H = H_{\text{products}} - H_{\text{reactants}} < 0$. A negative $\Delta H$ indicates an exothermic reaction. $\Delta G < 0$ indicates spontaneity, not necessarily exothermicity.

Uploaded by: Fani Warraich

Agriculture Economics QUESTION #11887

Question 7300

Consumer equilibrium (utility maximization) is achieved where:

The budget constraint intersects the origin
The indifference curve is tangent to the budget constraint, so $MRS = \dfrac{P_x}{P_y}$✔️
Total utility equals total expenditure
Marginal utility of each good equals zero

Correct Answer Logic:

Utility maximization occurs at the tangency of the highest attainable indifference curve and the budget line, where $MRS = \dfrac{P_x}{P_y}$.

Uploaded by: Fani Warraich

More Options

Suggest a Question