Reading Mode - Questions

Chemistry QUESTION #7505

Match the mixtures in Item I with the correct separation methods in Item II:

Item I (Mixture)	Item II (Method)
(A) H$_2$O : Sugar	(P) Sublimation
(B) H$_2$O : Aniline	(Q) Recrystallization
(C) H$_2$O : Toluene	(R) Steam distillation
	(S) Differential extraction

(A)→(S); (B)→(R); (C)→(P)
(A)→(Q); (B)→(R); (C)→(S)✔️
(A)→(R); (B)→(P); (C)→(S)
(A)→(Q); (B)→(R); (C)→(P)

Correct Answer Logic:

Separation logic:

H$_2$O + Sugar: Sugar is a solid dissolved in water. Recovered by evaporating water and allowing the sugar to crystallize — this is recrystallization (Q).
H$_2$O + Aniline: Aniline is slightly miscible with water and has a high boiling point. It is separated by steam distillation (R) — aniline distils with steam below its normal boiling point.
H$_2$O + Toluene: Toluene is immiscible with water. Separated by differential extraction (S) using a separating funnel.

Correct: (A)→(Q), (B)→(R), (C)→(S)

Uploaded by: Fani Warraich

Home Economics QUESTION #6277

Question 6842

What is the chemical name for the natural polymer found in Cotton and Linen?

Fibroin
Polyester
Cellulose✔️
Keratin

Correct Answer Logic:

Cellulose is the complex carbohydrate that forms the main structural component of plant cell walls.

Uploaded by: Fani Warraich

Pakistan Affairs QUESTION #9029

Question 6843

Which Prime Minister of Pakistan had the shortest tenure?

Gen. Muhammad Ayub Khan
I.I. Chundrigar✔️
Malik Feroze Khan Noon
M. Ali Bogra

Correct Answer Logic:

I.I. Chundrigar served only about two months in 1957.

Uploaded by: Fani Warraich

General Knowledge QUESTION #4795

Question 6844

Locations that experience equal intensity of earthquake impact are connected by which lines?

Snowlines
Seismic belts
Isoseismal lines✔️
Epicentral lines

Correct Answer Logic:

Isoseismal lines (or seismic lines) connect points on a map that experienced equal intensity of shaking during an earthquake, helping scientists map the impact pattern.

Uploaded by: Fani Warraich

MCQs Section QUESTION #4873

Question 6845

Correct antonym of "COVENANT" is

Prayer
Debate✔️
Garden
Agreement

Correct Answer Logic:

A covenant is a formal, solemn agreement or contract. Its antonym here is 'debate,' implying disagreement or dispute rather than a settled agreement.

Uploaded by: Fani Warraich

Biomedical Sciences QUESTION #3802

Question 6846

Which cardiac valves specifically prevent blood from flowing back into the ventricular chambers after systole?

Valves in the veins
Atrio-ventricular valves
Pericardium
Aortic and pulmonary valves✔️

Correct Answer Logic:

The aortic and pulmonary semilunar valves prevent backflow of blood from the aorta and pulmonary artery into the left and right ventricles respectively.

Uploaded by: Fani Warraich

Dairy Food Science and Technology QUESTION #5893

Question 6847

The term 'syneresis' in the context of yoghurt and cheese refers to:

Microbial spoilage causing off-flavors
Contraction of the protein gel network expelling whey✔️
Excessive lactose crystallization causing sandiness
Lipid oxidation causing rancidity

Correct Answer Logic:

Syneresis is the spontaneous contraction of the casein gel/curd matrix expelling entrapped whey. In yoghurt, excessive syneresis causes a watery layer. It is influenced by protein concentration, $\text{pH}$ at gelation, heat treatment of milk, and rate of acidification.

Uploaded by: Fani Warraich

Math Physics Chemistry Biology QUESTION #4332

Question 6848

Why are retroviruses placed in a separate class of RNA viruses?

They always infect animal cells only
Their RNA acts directly as mRNA
They lack protein coats
They use reverse transcriptase to make DNA from RNA✔️

Correct Answer Logic:

Retroviruses (e.g., HIV) carry reverse transcriptase, which synthesizes DNA from their RNA genome — the reverse of the normal DNA $\rightarrow$ RNA flow, hence the name retrovirus.

Uploaded by: Fani Warraich

Paper-I (Anatomy/Physiology and Biochemistry/Microbiology) QUESTION #3466

Question 6849

'Negative Nitrogen Balance' occurs when:

Nitrogen intake equals output
Nitrogen output exceeds intake (as in starvation or severe illness)✔️
Muscles are growing
During pregnancy

Correct Answer Logic:

Indicates body protein is being broken down faster than it is replaced.

Uploaded by: Fani Warraich

Paper-I (Anatomy/Physiology and Biochemistry/Microbiology) QUESTION #3240

Question 6850

Which molecule acts as the 'Primary Driver' for the diffusion of oxygen from alveoli into the blood?

Partial pressure gradient of $O_2$✔️
Active transport proteins
Water pressure
Blood sugar levels

Correct Answer Logic:

Gases move from areas of high partial pressure to low partial pressure.

Uploaded by: Fani Warraich

Boilers Mechanical Engineering QUESTION #3992

Question 6851

The 'Bourdon Tube' is the most common component found in a:

Water Level Gauge
Pressure Gauge✔️
Steam Trap
Blow-off Cock

Correct Answer Logic:

The tube straightens under pressure, moving the needle on the gauge dial.

Uploaded by: Fani Warraich

Physics and Math QUESTION #783

Question 6852

If $ax^2 + 2hxy + by^2 = 0$, their lines are orthogonal when:

$a + b = 0$✔️
$a - b = 0$
$a = b$
None

Correct Answer Logic:

For the pair of lines $ax^2 + 2hxy + by^2 = 0$ to be perpendicular, the sum of coefficients of $x^2$ and $y^2$ must be zero: $a + b = 0$.

Uploaded by: Fani Warraich

English QUESTION #8373

Question 6853

Choose the passive voice of: 'All agreed to what I proposed.'

What I proposed was agreed to by all✔️
What was proposed agreed by all
What has been proposed agreed by all
All of these

Correct Answer Logic:

Correct passive: 'What I proposed was agreed to by all'.

Uploaded by: Fani Warraich

Paper-I (Anatomy/Physiology and Biochemistry/Microbiology) QUESTION #3184

Question 6854

'Erythropoietin' (EPO), which regulates RBC production, is primarily secreted by the:

Bone Marrow
Spleen
Kidney✔️
Liver

Correct Answer Logic:

Hypoxia (low oxygen) stimulates the kidneys to release EPO.

Uploaded by: Fani Warraich

General Knowledge QUESTION #8630

Question 6855

How many scribes (writers) are recorded to have written the divine revelation (Wahee) during the Prophet's lifetime?

31
35
40✔️
42

Correct Answer Logic:

About 35 scribes are recorded for writing the Quranic revelation.

Uploaded by: Fani Warraich

General Knowledge QUESTION #4716

Question 6856

The UN Millennium Development Goals program encompassed which of the following objectives?

Eradicate extreme poverty and hunger only
Achieve Universal Primary Education only
Promote gender equality and empower women only
All of these objectives combined✔️

Correct Answer Logic:

The UN MDGs (2000–2015) comprised 8 goals including eradicating poverty, achieving universal education, promoting gender equality, reducing child mortality, improving maternal health, combating diseases, ensuring sustainability, and developing global partnerships.

Uploaded by: Fani Warraich

Agronomy QUESTION #2110

Question 6857

The 'yield gap' concept in agronomy is defined as the difference between:

The yield of traditional varieties and modern high-yielding varieties under the same management
Potential yield (Yp — maximum achievable by best-adapted variety with optimal management, no biotic/abiotic stress) and actual farm yield (Ya) — quantifying the improvement possible through better agronomic management, technology adoption, and policy support without requiring new variety development✔️
The yield of irrigated crops versus rainfed crops in the same region
The maximum recorded experimental yield and the national average yield reported by FAO

Correct Answer Logic:

Yield gap analysis (van Ittersum framework): Yp = potential yield (radiation-limited in irrigated; temperature and radiation in rainfed = water-limited yield, Yw). Ya = actual farm yield. Yield gap = Yp or Yw − Ya. Globally, average Ya is 50–60% of Yp for major cereals. Closing the yield gap through improved agronomy (fertilization, pest control, irrigation timing) can double production without expanding cultivated area.

Uploaded by: Fani Warraich