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Physics QUESTION #7013

A magnetic needle has magnetic moment $9.85 \times 10^{-2}\ \text{A/m}^2$ and moment of inertia $5 \times 10^{-6}\ \text{kg\,m}^2$. It performs 10 complete oscillations in 5 seconds in a uniform magnetic field. Find the magnitude of the field in mT.
(Take $\pi^2 = 9.85$)

10 mT✔️
20 mT
5 mT
1 mT

Correct Answer Logic:

Time period: $T = \frac{5}{10} = 0.5\ \text{s}$

Formula for oscillation: $T = 2\pi\sqrt{\frac{I}{MB}}$

$B = \frac{4\pi^2 I}{MT^2} = \frac{4 \times 9.85 \times 5\times10^{-6}}{9.85\times10^{-2} \times (0.5)^2}$

$= \frac{4 \times 9.85 \times 5\times10^{-6}}{9.85\times10^{-2} \times 0.25} = \frac{20\times10^{-5}}{2.4625\times10^{-3}} = 0.01\ \text{T} = 10\ \text{mT}$

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English QUESTION #492

Question 1242

She had left him with a calmness and a poise that accord well with his own inward emotions.

had left
calmness and a poise that accord
well with
own inward✔️

Correct Answer Logic:

Error: 'accord' should be 'accorded'

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Math Physics Chemistry Biology QUESTION #4172

Question 1243

Which muscle tissue is under conscious control and is multinucleated?

Smooth muscle
Skeletal muscle✔️
Cardiac muscle
Visceral muscle

Correct Answer Logic:

Skeletal muscle is voluntary (conscious control) and multinucleated.

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Quantitative Reasoning QUESTION #8149

Question 1244

In the passage about David Cressy's study of English immigration to New England, the author is primarily concerned with:

summarizing the findings of an investigation✔️
analyzing a method of argument
evaluating a point of view
hypothesizing about a set of circumstances

Correct Answer Logic:

The passage describes what Cressy examined (types of immigrants and their motivations), what sources he used, and what he found (skilled family-organized immigrants, mostly motivated by material improvement rather than religion). This is a straightforward summary of a researcher's findings. The author does not critique Cressy's methodology, evaluate his conclusions skeptically, or offer alternative hypotheses.

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Agronomy QUESTION #2086

Question 1245

An ideal seedbed for small-seeded crops (wheat, canola) must achieve which combination of physical characteristics?

Deep (30+ cm), fine, loose structure with maximum air pore space
Firm at depth for capillary water supply to germinating seeds, fine and friable at the surface (clods < 5–10 mm), level for uniform sowing depth, and free from large clods that create air pockets around seeds causing poor seed-soil contact✔️
Saturated with water to maximum field capacity before sowing
Rough and cloddy to prevent wind erosion of the seedbed before germination

Correct Answer Logic:

Small seeds have limited food reserves — they need intimate seed-soil contact for water imbibition (capillary supply from firm subsoil), precise sowing depth (1–3 cm), and fine tilth for rapid, uniform emergence. Large clods create air gaps around seeds, disrupting water supply. However, over-pulverization destroys structure, causing surface crusting that impedes seedling emergence.

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General Knowledge QUESTION #8806

Question 1246

Which district of Punjab is the largest by area?

Dera Ghazi Khan✔️
Rajanpur
Bahawalpur
Rahim Yar Khan

Correct Answer Logic:

Dera Ghazi Khan is the largest district in Punjab by area.

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Dairy Food Science and Technology QUESTION #5919

Question 1247

Plasmin, an important endogenous milk protease, is significant in cheese ripening because it:

Is completely inactivated during HTST pasteurization and has no role in cheese
Survives pasteurization and even UHT treatment, and preferentially hydrolyzes $\beta$-casein and $\alpha_{s2}$-casein during ripening✔️
Acts specifically on whey proteins, not casein
Requires $\text{pH} < 4.0$ for activity

Correct Answer Logic:

Plasmin is an alkaline serine protease (optimum $\text{pH}\;7\text{–}8$) that is heat stable — it partially survives HTST and significantly survives UHT. It preferentially attacks $\beta$-casein and $\alpha_{s2}$-casein. In Emmental and Gouda cheeses, plasmin activity during maturation is important for texture and flavor development.

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Civil Engineering QUESTION #2119

Question 1248

In the moment distribution method for analyzing indeterminate structures, the distribution factor (DF) for a member at a joint is defined as:

The ratio of the member stiffness to the sum of stiffnesses of all members meeting at the joint✔️
The ratio of the fixed-end moment in the member to the total applied moment at the joint
The carry-over factor multiplied by the member stiffness
The ratio of span length to total length of all members at the joint

Correct Answer Logic:

Distribution Factor $DF = \dfrac{K_{member}}{\sum K_{members\,at\,joint}}$, where $K = \dfrac{4EI}{L}$ for far-end fixed and $K = \dfrac{3EI}{L}$ for far-end pinned. The sum of DFs at any joint always equals 1.0 (except at fixed supports where DF = 0). The DF determines what fraction of the unbalanced moment is distributed to each member at a joint.

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Chemistry QUESTION #1018

Question 1249

The most stable carbocation from the following is:

Benzyl carbocation $(\text{PhCH}_2^+)$ without additional substituent
Benzyl carbocation with $-\text{OMe}$ at para position (electron-donating)
Benzyl carbocation with $-\text{OMe}$ at meta position✔️
Benzyl carbocation with $-\text{CH}_3$ at para position

Correct Answer Logic:

Carbocation stability increases with electron-donating groups at ortho/para positions via resonance. A $-\text{OMe}$ group at the para position donates electrons by resonance directly into the carbocation centre, making it the most stable. Meta substitution cannot relay resonance to the positive charge.

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Planning QUESTION #4953

Question 1250

What does 'Sustainability' in planning fundamentally require?

Economic growth only
Meeting present needs without compromising future generations✔️
Maximizing resource use
Preventing all development

Correct Answer Logic:

Sustainability, as defined by the Brundtland Commission, means meeting the needs of the present generation without compromising the ability of future generations to meet their own needs.

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Physics QUESTION #997

Question 1251

A tube of length $L$ has radius 2 cm at point (1) and 1 cm at point (2). If velocity of water entering at point (1) is $2\ \text{m/s}$, the velocity of water leaving at point (2) will be:

4 m/s
2 m/s
6 m/s
8 m/s✔️

Correct Answer Logic:

By continuity equation: $A_1 v_1 = A_2 v_2$. $\pi(2)^2 \times 2 = \pi(1)^2 \times v_2 \Rightarrow v_2 = \frac{4\times2}{1} = 8\ \text{m/s}$.

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Math Physics Chemistry Biology QUESTION #793

Question 1252

Which of the following is not an alkali metal?

Ra✔️
K
Na
All

Correct Answer Logic:

Ra (Radium) is an alkaline earth metal (Group II), not an alkali metal. Alkali metals are Group I elements like K and Na.

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Library Sciences QUESTION #1496

Question 1253

Resource Description and Access (RDA) was developed as a successor to which cataloguing code?

AACR1
ISBD
AACR2✔️
Dublin Core

Correct Answer Logic:

RDA replaced AACR2 (Anglo-American Cataloguing Rules, 2nd edition). It was developed to address the limitations of AACR2 in the digital environment and is aligned with the FRBR (Functional Requirements for Bibliographic Records) conceptual model.

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Math Physics Chemistry Biology QUESTION #4281

Question 1254

The complementary base pairing in DNA is important because it:

Maintains the tertiary structure of enzymes
Provides energy for all cell metabolism
Enables protein to fold properly
Allows DNA to act as a genetic blueprint during replication✔️

Correct Answer Logic:

Complementary base pairing (A–T, G–C) ensures accurate replication — each strand acts as a template, making DNA the reliable genetic blueprint.

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Chemistry QUESTION #7144

Question 1255

A solid with a density of $9 \times 10^{3}\text{ kg m}^{-3}$ forms an FCC crystal with an edge length of $200\sqrt{2}\text{ pm}$. Calculate the molar mass of this solid. ($N_A = 6 \times 10^{23}\text{ mol}^{-1}$)

$0.0305\text{ kg mol}^{-1}$
$0.4320\text{ kg mol}^{-1}$
$0.0432\text{ kg mol}^{-1}$✔️
$0.0216\text{ kg mol}^{-1}$

Correct Answer Logic:

Using the density formula $M = \frac{d \times N_A \times a^3}{Z}$:

$d = 9000\text{ kg/m}^3$
$Z = 4$ (for FCC)
$a = 200\sqrt{2} \times 10^{-12}\text{ m}$

Calculation: $a^3 = (200\sqrt{2})^3 \times 10^{-36} = 1.6 \times 10^{-29}\text{ m}^3$.
$M = \frac{9000 \times 6 \times 10^{23} \times 1.6 \times 10^{-29}}{4} = 0.0432\text{ kg mol}^{-1}$.

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Islamic Studies QUESTION #8202

Question 1256

How many Surahs does the Holy Quran comprise of?

114 Surahs✔️
115 Surahs
116 Surahs
117 Surahs

Correct Answer Logic:

The Holy Quran contains 114 Surahs (chapters). These Surahs vary in length from 3 verses (Surah Al-Kawthar) to 286 verses (Surah Al-Baqarah). The Quran is divided into 30 Juz (parts) for easy recitation during Ramadan. 86 Surahs were revealed in Makkah (Makki) and 28 in Medina (Madani). Each Surah has a distinct name and covers various aspects of faith, law, and guidance.

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Ability / HR / Governance / Special Education QUESTION #1802

Question 1257

Under the two-stage bidding procedure in Rule 36(c), the minimum time allowed to bidders for national competitive bidding between first and second stage submissions is:

Seven days
Ten days
Fifteen days✔️
Thirty days

Correct Answer Logic:

Rule 36(c)(iv) provides that sufficient time must be allowed to bidders to prepare revised bids, and the proviso specifies this allowance shall not be less than fifteen days in the case of national competitive bidding and thirty days for international competitive bidding.

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Urdu QUESTION #5268

Question 1258

گنجہائے گرام مایا مشتمل ہے:

مکتوبوں پر
نثر نگاری پر
خاکوں پر✔️
ان میں سے کوئی نہیں

Correct Answer Logic:

گنجہائے گرام مایا احمد ندیم قاسمی کے خاکوں کا مجموعہ ہے (متن کے مطابق خاکے ہیں مگر اصلاً یہ 'گنجینہ' خاکوں کا ہے)۔

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Psychology QUESTION #9796

Question 1259

Concern with meeting standards of excellence and accomplishing difficult tasks is referred to as the need for:

Affiliation
Achievement✔️
Power
Apperception

Correct Answer Logic:

The need for achievement (n-Ach) (McClelland, Atkinson) is the motivation to excel, accomplish challenging goals, and attain standards of excellence — distinct from affiliation (relationships) and power (influence).

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Islamic Studies QUESTION #8199

Question 1260

For how many years did the Caliphate of Hazrat Abu Bakr (RA) last?

Two yeas✔️
Thee yeas
Four years
Five years

Correct Answer Logic:

The caliphate of Hazrat Abu Bakr (RA) lasted approximately 2 years and 3 months (632-634 CE / 11-13 AH). During this brief period, he accomplished tremendous achievements: compiled the Quran in one volume, suppressed false prophets and apostasy (Ridda Wars), sent expeditions to Syria and Iraq, and established the foundations of Islamic governance. He died at age 63 and nominated Hazrat Umar (RA) as his successor.

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