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Biomedical Sciences QUESTION #3802

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.

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Reading and Writing (Module-1) QUESTION #10421

Question 2

The city's new policy proved ------- , solving the traffic problem it was designed to address within months.

ineffective
effective✔️
counterproductive
irrelevant

Correct Answer Logic:

A policy that 'solves the problem it was designed to address' is 'effective.'

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General Knowledge QUESTION #2596

Question 3

Which of the following is an example of 'Open Source' software?

Microsoft Windows
Adobe Photoshop
Linux Operating System✔️
Apple macOS

Correct Answer Logic:

Open source means developers allow other developers to share, modify, and distribute software for free. Linux OS is a prime example of open source software. Windows, macOS, and Adobe Photoshop are proprietary (closed-source) software products.

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Agronomy QUESTION #2069

Question 4

The competition between component crops in intercropping systems is best quantified using the Competitive Ratio (CR), where $CR_A > 1$ indicates that:

Crop A is producing lower yield than crop B in the intercrop
Crop A is more competitive than crop B — it acquires a greater share of the growth resources (light, water, nutrients) relative to its share in sole cropping, usually at the expense of crop B✔️
The intercropping system has a LER greater than 1
Both crops are equally competitive and the system is in equilibrium

Correct Answer Logic:

Competitive Ratio $CR_A = \dfrac{LER_A}{LER_B} \times \dfrac{Z_B}{Z_A}$, where $Z$ is the proportion of each crop in the mixture. $CR_A > 1$ means Crop A acquires more than its proportional share of resources. Managing CR guides choice of species combinations, row arrangements, and relative densities to reduce dominance of one component and improve overall system productivity.

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Education QUESTION #6758

Question 5

Which of the following BEST distinguishes the SOLO Taxonomy's "Relational" level from its "Multi-structural" level?

At the Relational level, students recall more facts than at the Multi-structural level
At the Relational level, students integrate multiple components into a coherent whole and understand how parts contribute to the whole; at Multi-structural level, components are understood discretely without integration✔️
The Relational level involves extended abstract thinking while Multi-structural involves concrete thinking
Multi-structural requires more content knowledge than Relational

Correct Answer Logic:

In SOLO Taxonomy, Multi-structural understanding means several components are known but each remains discrete — students cannot see the whole. At the Relational level, the components are connected and integrated: students understand cause-effect, compare-contrast, and see how parts contribute to a unified whole. This integration is the key differentiator.

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FIA Act QUESTION #9999

Question 6

If a Provincial Police officer wants to know the source of the FIA's arrest powers analogous to ordinary police, the correct answer is that FIA members have powers, duties, privileges and liabilities of:

Federal Ministers
Provincial Police officers investigating under the Code✔️
Judicial Magistrates
Customs officials

Correct Answer Logic:

Section 5(1) equates FIA members' powers/duties with those of Provincial Police under the Code.

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English QUESTION #2725

Question 7

Which word is a PREPOSITION in the sentence: 'The cat is sitting under the table.'?

cat
sitting
under✔️
table

Correct Answer Logic:

A preposition shows the relationship between a noun/pronoun and another word in the sentence. 'Under' shows the spatial relationship between 'cat' and 'table'.

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Physics QUESTION #382

Question 8

The algebraic sum of potential changes in a closed circuit is zero is Kirchhoff's __________ rule.

First
Second✔️
Third
None of these

Correct Answer Logic:

This is Kirchhoff's voltage law (second rule)

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Paper-I (Anatomy/Physiology and Biochemistry/Microbiology) QUESTION #3527

Question 9

If a pharmacist finds that a sample of 'Digitalis' leaves has $20\%$ moisture, why is this a problem?

Moisture promotes enzyme activity and microbial growth, leading to drug deterioration✔️
Moisture makes the drug too heavy
Moisture turns the drug into a liquid
There is no problem

Correct Answer Logic:

Crude drugs must be dried to prevent chemical breakdown and spoilage.

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Biology Zoology Botany QUESTION #10783

Question 10

Arms are absent in which class of Echinodermata?

Ophiuroidea
Asteroidea
Echinoidea✔️
Crinoidea

Correct Answer Logic:

Echinoidea (sea urchins and sand dollars) lack arms entirely. They have a globular or flattened body enclosed in a rigid test (shell) with spines. In contrast, Asteroidea (sea stars) have 5 arms radiating from a central disc; Ophiuroidea (brittle stars) have 5 long, flexible arms; Crinoidea (feather stars, sea lilies) have multiple feathery arms used for filter feeding.

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Paper-II (Pharmacology and Social Behaviour, Law & Ethics and Computer Sciences) QUESTION #5752

Question 11

A drug with a high affinity for albumin is administered. Which statement regarding the 'bound' fraction is correct?

It is the only part that can act on target sites
It is pharmacologically inactive✔️
It is rapidly metabolized by the liver
It can easily cross the blood-brain barrier

Correct Answer Logic:

Bound drugs are pharmacologically inactive; only the free, unbound drug can act on target sites.

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Constitutional Law QUESTION #5833

Question 12

A state law requires all doctors to perform a specific medical procedure that the state deems 'necessary for public health.' A doctor refuses on religious grounds. Under the Free Exercise Clause, is the doctor exempt from the law?

Yes, because the law places a 'substantial burden' on his religious practice.
Yes, if the law is not 'neutral' or 'generally applicable.'
No, if the law is a neutral law of general applicability, even if it incidentally burdens religion.✔️
No, because medical procedures are never subject to religious exemptions.

Correct Answer Logic:

Under Employment Division v. Smith, a neutral law of general applicability does not violate the Free Exercise Clause, even if it incidentally burdens religious practices. The state does not need a compelling interest unless the law specifically targets religion or involves 'hybrid' rights.

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Dairy Food Science and Technology QUESTION #5978

Question 13

The minimum fat content of ice cream as per US FDA 21 CFR 135.110 is:

$5\%$
$8\%$
$10\%$✔️
$12\%$

Correct Answer Logic:

Under US FDA regulations (21 CFR 135.110), ice cream must contain $\geq 10\%$ milk fat and $\geq 20\%$ total milk solids, with $\geq 1.6\;\text{lb}$ food solids per gallon. Reduced-fat ice cream has $7.5\text{–}9.9\%$ fat; light ice cream has $\leq 50\%$ of reference fat.

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

Question 14

'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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Paper-II (Pharmacognosy and Pharmaceutics-I) QUESTION #3640

Question 15

Which family does 'Opium' (Afeem) belong to?

Papaveraceae✔️
Solanaceae
Rubiaceae
Liliaceae

Correct Answer Logic:

Papaver somniferum is the Opium poppy.

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Pakistan Affairs QUESTION #153

Question 16

What warning did Jinnah give the British PM in 1919 regarding the Sultan of Turkey?

Great Britain should establish direct rule over Turkey
Reducing the Sultan's status would cause a colossal and abiding reaction in India✔️
The Muslim world would support British policies
None of these

Correct Answer Logic:

This was part of the memorandum supporting the Khilafat cause to protect the Caliphate.

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Chemistry QUESTION #7358

Question 17

According to Bohr's theory, which transition in the hydrogen atom produces a photon with the least energy?

$n=5$ to $n=3$
$n=6$ to $n=1$
$n=5$ to $n=4$
$n=6$ to $n=5$✔️

Correct Answer Logic:

Key principle: Energy of emitted photon $\propto \Delta E = E_{n_1} - E_{n_2}$

The closer the two energy levels, the smaller the energy gap. For large $n$ values, the levels are very close together. The transition $n=6 \to n=5$ involves adjacent high-$n$ levels, so it releases the least energy (longest wavelength photon).

This transition falls in the infrared (Humphreys series).

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Education QUESTION #11646

Question 18

The type of curriculum organization in which different subjects or concepts are taught at the same grade level side by side is called _____ organization.

Horizontal✔️
Vertical
Logical
None of these

Correct Answer Logic:

Horizontal curriculum organization refers to the arrangement of content across subjects or disciplines at the same grade level — coordinating what is taught simultaneously. Vertical organization refers to the sequencing of content across grade levels (from lower to higher) over time.

Correct Answer: A — Horizontal.

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Chemistry QUESTION #7514

Question 19

A compound with molecular mass 180 is acylated with CH$_3$COCl to yield a compound with molecular mass 390. How many amino ($-\text{NH}_2$) groups does the original compound contain?

2
5✔️
4
6

Correct Answer Logic:

Acylation: each $-\text{NH}_2$ reacts with CH$_3$COCl to introduce a $-\text{COCH}_3$ group ($M = 42$) and release HCl.

Net mass added per amino group $= 42 - 1 = 42$ (the $-H$ is replaced by $-\text{COCH}_3$)

Wait — each NH$_2$ + CH$_3$COCl → NH$\cdot$COCH$_3$ + HCl. Mass change per group $= 42 - 1 = +41$... more precisely: $-NH_2$ (16) becomes $-NHCOCH_3$ (58): increase = 42.

Increase in mass $= 390 - 180 = 210$

Number of amino groups $= \dfrac{210}{42} = \mathbf{5}$

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Math Physics Chemistry Biology QUESTION #11259

Question 20

In the cardiac cycle the 'lub' sound is produced by:

Closure of the semilunar valves
Closure of the atrioventricular (AV) valves✔️
Opening of the AV valves
Contraction of the atria

Correct Answer Logic:

The first heart sound ('lub') is produced by the closure of the atrioventricular (AV) valves — the tricuspid and mitral (bicuspid) valves — at the beginning of ventricular systole. The 'dub' sound is produced by closure of the semilunar valves.

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