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Physics QUESTION #1177

A photon having the same energy as an electron has wavelength __________ as electron's De Broglie wavelength.

Shorter
Longer✔️
Same
None of these

Correct Answer Logic:

For an electron: $\lambda_e = \frac{h}{\sqrt{2m_eE}}$. For a photon: $\lambda_{ph} = \frac{hc}{E}$. Ratio: $\frac{\lambda_{ph}}{\lambda_e} = \frac{hc}{E} \cdot \frac{\sqrt{2m_eE}}{h} = c\sqrt{\frac{2m_e}{E}}$. For typical energies, this ratio $\gg 1$, meaning the photon's wavelength is much longer than the electron's De Broglie wavelength at the same energy.

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Urdu QUESTION #5225

Question 2

پروین شاکر کا ابتدائی تخلص کیا تھا؟

شاکر
بینا✔️
شبانہ
ان میں سے کوئی نہیں

Correct Answer Logic:

پروین شاکر کا ابتدائی تخلص 'بینا' تھا بعد میں انہوں نے 'شاکر' تخلص اختیار کیا۔

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English QUESTION #2798

Question 3

Complete the ANALOGY — an analogy shows a relationship between pairs of words: 'Doctor : Hospital :: Teacher : ___'

Office
Library
School✔️
University

Correct Answer Logic:

This analogy shows a 'worker : workplace' relationship. A doctor works in a hospital; a teacher works in a school. The relationship is: professional person to the place where they primarily work.

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Basic Mathematics QUESTION #4510

Question 4

If $a = 0$, what is $a \times 1000$?

$1000$
$0$✔️
$a$
Undefined

Correct Answer Logic:

Zero multiplied by any number equals zero. $0 \times 1000 = 0$

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Agronomy QUESTION #2094

Question 5

The concept of 'phenotypic plasticity' in crop adaptation to variable environments refers to:

The ability of a plant's DNA sequence to mutate in response to environmental stress
The capacity of a single genotype to express a range of phenotypes (morphological, physiological, or behavioral) in response to different environmental conditions — without genetic change — allowing crops to partially buffer yield across variable environments✔️
The selection of different varieties (genotypes) for each target environment
The use of plastic mulch films to modify the crop microenvironment

Correct Answer Logic:

Phenotypic plasticity describes genotype × environment (G×E) interaction at the individual plant level: one genotype producing different trait expressions (leaf area, tiller number, root architecture, phenology) across environments. Crops with high plasticity can partially self-regulate resource capture. Breeders must distinguish genetic adaptation (G) from plasticity (GEI) when evaluating varieties across diverse environments.

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Professional QUESTION #1884

Question 6

Under Rule 5(1)(i) when the Authority is the President or Prime Minister who exercises the powers of the authority regarding suspension/leave?

The Federal Cabinet
The Chairman Senate
The Secretary Establishment Division✔️
The Chief Justice of Pakistan

Correct Answer Logic:

The proviso to Rule 5(1)(i) specifically states that where the authority is the President or Prime Minister these powers shall be exercised by the Secretary Establishment Division.

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Agronomy QUESTION #2100

Question 7

Biological nitrogen fixation (BNF) by soybean-Bradyrhizobium japonicum symbiosis requires which essential micronutrient as a component of the nitrogenase enzyme complex?

Zinc (Zn) — as a cofactor for auxin-mediated nodule initiation
Molybdenum (Mo) — as a component of the iron-molybdenum cofactor (FeMo-co) at the active site of nitrogenase that reduces $N_2$ to $NH_3$✔️
Boron (B) — for nodule cell wall synthesis and longevity
Copper (Cu) — for leghemoglobin synthesis in nodule cortex

Correct Answer Logic:

Nitrogenase consists of two proteins: dinitrogenase (MoFe protein) containing the FeMo-co active site where $N_2$ is reduced ($N_2 + 8H^+ + 8e^- + 16ATP \rightarrow 2NH_3 + H_2 + 16ADP + 16P_i$), and dinitrogenase reductase (Fe protein). Mo is irreplaceable at the active site — Mo deficiency severely impairs BNF. Fe is also essential (leghemoglobin, Fe-S clusters). Both Mo and Fe are required for full BNF activity.

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Statistics QUESTION #2008

Question 8

In a Randomized Complete Block (RCB) design with $b = 9$ blocks and $t = 4$ treatments, the error degrees of freedom is:

35
32
24✔️
27

Correct Answer Logic:

Error df in RCBD $= (b-1)(t-1) = (9-1)(4-1) = 8 \times 3 = 24$. Equivalently, total df $= bt - 1 = 35$, blocks df $= b - 1 = 8$, treatments df $= t - 1 = 3$, so error df $= 35 - 8 - 3 = 24$.

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Psychology QUESTION #1464

Question 9

Which of the following is an example of a projective psychological test?

The Wechsler Intelligence Scale for Children (WISC)
The Minnesota Multiphasic Personality Inventory (MMPI)
The Rorschach Inkblot Test✔️
The Stanford-Binet Intelligence Scale

Correct Answer Logic:

The Rorschach Inkblot Test is a classic projective test in which individuals describe what they see in ambiguous inkblots — their responses are thought to reveal unconscious thoughts, feelings, and personality characteristics. Projective tests use ambiguous stimuli to 'project' inner states. WISC and Stanford-Binet are intelligence tests; MMPI is an objective (self-report) personality inventory.

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Reading and Writing (Module-1) QUESTION #5426

Question 10

Anthropologist Kristian Carlson studied "Little Foot's" fossilized clavicle and shoulder bones. These bones were found to be ____ those of modern apes that climb frequently, suggesting tree adaptation.

surpassed by
comparable to✔️
independent of
obtained from

Correct Answer Logic:

The bones were similar to those of climbing apes, so "comparable to" is correct.

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Biology Zoology Botany QUESTION #1378

Question 11

In dicot plants, the first leaf-like structure that emerges from the seed is called:

Hypocotyl
Cotyledon✔️
Epicotyl
Radicle

Correct Answer Logic:

Cotyledons are the seed leaves (embryonic leaves) present inside the seed. In dicots there are two cotyledons. They are the first leaf-like structures to emerge from a germinating seed and often serve as the primary source of nutrition for the seedling. The hypocotyl is the stem below cotyledons; epicotyl is above; radicle becomes the root.

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Chemistry QUESTION #1080

Question 12

Match List-I with List-II for Xenon compounds: (A) XeO$_3$ (B) XeF$_2$ (C) XeOF$_4$ (D) XeF$_6$; with (I) sp$^3$d; linear (II) sp$^3$; pyramidal (III) sp$^3$d$^3$; distorted octahedral (IV) sp$^3$d$^2$; square pyramidal

A-IV, B-II, C-III, D-I
A-IV, B-II, C-I, D-III
A-II, B-I, C-IV, D-III✔️
A-II, B-I, C-III, D-IV

Correct Answer Logic:

XeO$_3$: 3 bond pairs + 1 lone pair → sp$^3$, pyramidal (II). XeF$_2$: 2 bond pairs + 3 lone pairs → sp$^3$d, linear (I). XeOF$_4$: 5 bond pairs + 1 lone pair → sp$^3$d$^2$, square pyramidal (IV). XeF$_6$: 6 bond pairs + 1 lone pair → sp$^3$d$^3$, distorted octahedral (III). Matching: A-II, B-I, C-IV, D-III.

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Paper-II (Pharmacognosy and Pharmaceutics-I) QUESTION #3635

Question 13

Which part of 'Cinnamon' (Darchini) is used as medicine?

Leaves
Inner Bark✔️
Flowers
Roots

Correct Answer Logic:

Cinnamomum zeylanicum bark is the medicinal part.

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Sociology QUESTION #1663

Question 14

The theoretical framework of 'base and superstructure,' in which the economic mode of production is held to determine all legal, political, religious, and cultural forms of social life, is a foundational concept of which sociological tradition?

Structural Functionalism
Symbolic Interactionism
Marxist historical materialism✔️
Rational Choice Theory

Correct Answer Logic:

In Marxist theory, the 'base' refers to the economic infrastructure — the means and relations of production — while the 'superstructure' encompasses all other social institutions (law, religion, politics, culture) that arise from and serve to legitimize the base. This is a core concept of historical materialism, not functionalism or symbolic interactionism.

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Agronomy QUESTION #2056

Question 15

The plant-available water capacity (PAWC) of a soil is correctly expressed as:

The moisture content at field capacity only
$PAWC = \theta_{FC} - \theta_{PWP}$, where $\theta_{FC}$ is volumetric water content at field capacity ($-33$ kPa) and $\theta_{PWP}$ is at permanent wilting point ($-1500$ kPa)✔️
The total porosity of the soil minus bulk density
The gravitational water fraction that drains within 48 hours of saturation

Correct Answer Logic:

PAWC represents the reservoir of water accessible to plant roots. It equals the difference in volumetric water content between field capacity (−33 kPa, where drainage becomes negligible) and permanent wilting point (−1500 kPa, where plants cannot extract water). Sandy soils have low PAWC; loam soils have the highest.

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English QUESTION #2767

Question 16

Find the word OPPOSITE IN MEANING to 'Verbose'.

Talkative
Concise✔️
Lengthy
Wordy

Correct Answer Logic:

'Verbose' means using more words than needed (wordy). Its antonym is 'Concise', which means giving a lot of information clearly and in few words. 'Talkative', 'Lengthy', and 'Wordy' are synonyms of verbose.

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Physics QUESTION #1061

Question 17

An unpolarized light beam is incident on medium of refractive index 1.73 at Brewster's angle. Then:

Both reflected and transmitted light are perfectly polarized at 60° and 30°
Transmitted light is completely polarized with refraction angle close to 30°
Reflected light is completely polarized and angle of reflection is close to 60°✔️
Reflected light is partially polarized and angle of reflection is close to 30°

Correct Answer Logic:

Brewster's angle: $\tan\theta_B=n=1.73\approx\sqrt{3}\Rightarrow\theta_B=60°$. At Brewster's angle, reflected light is completely polarized (in the plane perpendicular to incidence). Angle of reflection $=60°$. Transmitted light is partially polarized (not completely). Answer: option (3).

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