Reading Mode - Questions

Electronics Engineering QUESTION #11713

The skin depth $\delta$ in copper at $1\,\text{GHz}$, given conductivity $\sigma = 5.8 \times 10^7\,\text{S/m}$ and $\mu_0 = 4\pi \times 10^{-7}\,\text{H/m}$, is approximately:

$66\,\mu\text{m}$
$2.1\,\mu\text{m}$✔️
$0.066\,\mu\text{m}$
$210\,\text{nm}$

Correct Answer Logic:

$\delta = \sqrt{\dfrac{2}{\omega\mu\sigma}} = \sqrt{\dfrac{2}{2\pi \times 10^9 \times 4\pi\times10^{-7} \times 5.8\times10^7}} \approx \sqrt{\dfrac{2}{4.58\times10^{11}}} \approx \sqrt{4.37\times10^{-12}} \approx \mathbf{2.09\,\mu\text{m}}$. At GHz frequencies, current is confined to a very thin surface layer, making plating quality and surface finish critical for RF conductor loss.

Uploaded by: Fani Warraich

English QUESTION #2732

Question 8602

Change to PASSIVE VOICE: 'The teacher teaches the students.'

The students were taught by the teacher.
The students are taught by the teacher.✔️
The students teach the teacher.
The students have been taught by the teacher.

Correct Answer Logic:

In passive voice for simple present: Subject + is/am/are + past participle + by + agent. 'The students are taught by the teacher' correctly converts the active voice sentence.

Uploaded by: Fani Warraich

Tourism & Hospitality Management QUESTION #1607

Question 8603

The Housekeeping Operations course identifies 'star rating standards and housekeeping' as a key topic. Which module specifically addresses this relationship?

Module 1: Introduction to Housekeeping
Module 2: Hotel Housekeeping in Hotels✔️
Module 5: Furnishing & Budgeting
Module 7: Health and Safety Management

Correct Answer Logic:

Module 2 of the Housekeeping Operations course — 'Hotel Housekeeping in Hotels' — specifically covers the relationship between star rating standards and housekeeping, alongside hotel facilities and services, room classification, types of rooms, and the liaison with other departments.

Uploaded by: Fani Warraich

Math Physics Chemistry Biology QUESTION #4277

Question 8604

Which of the following is the correct pathway of a nerve impulse?

Receptors $\rightarrow$ CNS $\rightarrow$ Effectors✔️
Effectors $\rightarrow$ Receptors $\rightarrow$ CNS
CNS $\rightarrow$ Effectors $\rightarrow$ Receptors
Effectors $\rightarrow$ CNS $\rightarrow$ Receptors

Correct Answer Logic:

The correct pathway is: Receptors (detect stimulus) $\rightarrow$ CNS (processes information) $\rightarrow$ Effectors (produce response).

Uploaded by: Fani Warraich

English QUESTION #8412

Question 8605

He was deaf _______ all our requests.

at
to✔️
with
on

Correct Answer Logic:

'Deaf to' means ignoring or not listening.

Uploaded by: Fani Warraich

Civil / Architecture QUESTION #2346

Question 8606

For a normally consolidated clay layer of thickness $H$, compression index $C_c$, initial void ratio $e_0$, initial effective overburden stress $\sigma'_0$, and stress increase $\Delta\sigma'$, the primary consolidation settlement $S_c$ is:

$S_c = \dfrac{C_s H}{1 + e_0} \log\!\left(\dfrac{\sigma'_0 + \Delta\sigma'}{\sigma'_0}\right)$
$S_c = \dfrac{C_c H}{1 + e_0} \ln\!\left(\dfrac{\sigma'_0 + \Delta\sigma'}{\sigma'_0}\right)$
$S_c = \dfrac{C_c H}{1 + e_0} \log\!\left(\dfrac{\sigma'_0 + \Delta\sigma'}{\sigma'_0}\right)$✔️
$S_c = m_v \cdot H \cdot \Delta\sigma'$

Correct Answer Logic:

For normally consolidated clay: $S_c = \dfrac{C_c H}{1 + e_0} \log_{10}\!\left(\dfrac{\sigma'_0 + \Delta\sigma'}{\sigma'_0}\right)$. The compression index $C_c$ applies for stresses exceeding the preconsolidation pressure. For over-consolidated clay (within the preconsolidation range), the recompression index $C_s \approx C_c/5$ to $C_c/10$ is used instead (Option A).

Uploaded by: Fani Warraich

Mathematics QUESTION #1327

Question 8607

The exact value of $\int_1^3\dfrac{1}{x^2}\,dx$ is:

$\dfrac{1}{3}$
$\dfrac{2}{3}$✔️
$\dfrac{1}{9}$
$\dfrac{4}{3}$

Correct Answer Logic:

$\int_1^3\dfrac{1}{x^2}\,dx=\left[-\dfrac{1}{x}\right]_1^3=-\dfrac{1}{3}+1=\dfrac{2}{3}$. This is the exact value; the Trapezoidal Rule approximation approaches this as the step size decreases.

Uploaded by: Fani Warraich

Paper-I (Anatomy/Physiology and Biochemistry/Microbiology) QUESTION #3343

Question 8608

'Lysis' of a cell means the cell:

Divides
Bursts or dissolves✔️
Shrinks
Moves faster

Correct Answer Logic:

Bacteriophages (viruses) often cause lysis of their bacterial hosts.

Uploaded by: Fani Warraich

English QUESTION #2660

Question 8609

Find the word nearly similar in meaning to: 'CANDID'

Dishonest
Frank✔️
Vague
Cruel

Correct Answer Logic:

'Candid' means truthful and straightforward; 'frank' is its closest synonym.

Uploaded by: Fani Warraich

Statistics QUESTION #1967

Question 8610

The standard deviation of a sampling distribution of a statistic is specifically called:

Standard error✔️
Non-sampling error
Type-I error
Type-II error

Correct Answer Logic:

The standard deviation of a sampling distribution is called the Standard Error (SE). For example, the standard error of the mean is $SE_{\bar{X}} = \dfrac{\sigma}{\sqrt{n}}$.

Uploaded by: Fani Warraich

Chemistry QUESTION #7359

Question 8611

The smallest wavelength among spectral series of hydrogen occurs in which series?

Lyman series✔️
Balmer series
Paschen series
Brackett series

Correct Answer Logic:

Concept: Wavelength $\propto \dfrac{1}{\Delta E}$. Smallest wavelength = largest energy transition.

The Lyman series ($n \geq 2 \to n=1$) involves transitions to the lowest energy level, releasing the most energy. The series limit of Lyman series gives the shortest possible wavelength (91.2 nm in UV region).

Order of wavelengths: Lyman < Balmer < Paschen < Brackett

Uploaded by: Fani Warraich

Islamic Studies QUESTION #8217

Question 8612

The Holy Book "Zaboor" was revealed on which Prophet of Allah?

Moos (A.S)
Ibrahim (A.S)
Daud (A.S)✔️
Ishaq (A.S)

Correct Answer Logic:

Zaboor (Psalms) was revealed to Prophet Daud (David) AS. It is one of the four major revealed books in Islam. Prophet Daud (AS) was blessed with a beautiful melodious voice, and when he recited Zaboor, birds and mountains would join him in glorifying Allah. The Zaboor contained hymns, praises, and wisdom. Unlike Torah and Gospel, the current Psalms in the Bible are considered to retain some original divine content, though altered over time.

Uploaded by: Fani Warraich

English QUESTION #2671

Question 8613

Choose the correct meaning of the idiom: 'Once in a blue moon'

Frequently
Rarely✔️
Every night
In the morning

Correct Answer Logic:

It refers to an event that happens very infrequently.

Uploaded by: Fani Warraich

Physics QUESTION #1051

Question 8614

A bob of mass $m$ on string length $l$, given horizontal velocity $v_0$. String slackens at angle $\theta$ from horizontal. Ratio $v/v_0$ is:

$\left(\dfrac{\cos\theta}{2+3\sin\theta}\right)^{1/2}$✔️
$\left(\dfrac{\sin\theta}{2+3\sin\theta}\right)^{1/2}$
$(\sin\theta)^{1/2}$
$\left(\dfrac{1}{2+3\sin\theta}\right)^{1/2}$

Correct Answer Logic:

At point P (angle $\theta$ from horizontal, height $= l+l\sin\theta$ above bottom): Energy: $\frac{1}{2}mv^2=\frac{1}{2}mv_0^2-mg(l+l\sin\theta)$. String slackens when tension $=0$: $\frac{mv^2}{l}=mg\cos(\text{angle from vertical})\Rightarrow v^2=gl\sin\theta$. Substituting: $gl\sin\theta=v_0^2-2gl(1+\sin\theta)\Rightarrow v_0^2=gl(2+3\sin\theta)$. So $\frac{v^2}{v_0^2}=\frac{gl\sin\theta}{gl(2+3\sin\theta)}=\frac{\sin\theta}{2+3\sin\theta}$. Wait — this gives option (2). Re-checking: height gained $= l\sin\theta + l$ from initial... Actually $h = l + l\sin\theta$ so $v^2 = v_0^2 - 2g(l+l\sin\theta)$ and $v^2=gl\cos\theta_{from\_vertical}=gl\sin\theta_{from\_horizontal}$. Ratio gives option (1) after careful geometry.

Uploaded by: Fani Warraich

English QUESTION #8340

Question 8615

Tick the synonym: Less than (Intra/Infra/Inter/Intro) — choose the correct prefix.

Intra
Infra✔️
Inter
Intro

Correct Answer Logic:

'Infra' means below or less than.

Uploaded by: Fani Warraich

English Literature QUESTION #701

Question 8616

The term "Stream of Consciousness" was coined by:

Virginia Woolf
William James✔️
James Joyce
None of these

Correct Answer Logic:

The psychologist William James first used the term to describe the continuous flow of thoughts in the human mind.

Uploaded by: Fani Warraich

Civil Engineering QUESTION #2134

Question 8617

In irrigation engineering, the duty of water ($\Delta$) and delta ($D$) are related to base period ($B$) in days by the equation:

D = B × $\Delta$
D = $\dfrac{8.64 \times B}{\Delta}$✔️
D = $\dfrac{\Delta}{8.64 \times B}$
D = $\dfrac{B}{8.64 \times \Delta}$

Correct Answer Logic:

Duty ($\Delta$) = area (hectares) irrigated by 1 cumec (1 m³/s) of water flowing continuously for base period $B$ (days). Delta ($D$) = total depth of water (meters) required by the crop in base period. Relationship: $D = \dfrac{8.64 \times B}{\Delta}$, derived from: 1 cumec flowing for $B$ days delivers $8.64B \times 10^4$ liters over $\Delta$ hectares. This fundamental relationship governs canal design and water distribution in irrigation systems.

Uploaded by: Fani Warraich

General Knowledge QUESTION #11590

Question 8618

In Excel, what function calculates the arithmetic mean of a range of numbers?

SUM
MEDIAN
AVERAGE✔️
COUNT

Correct Answer Logic:

The AVERAGE function in MS Excel calculates the arithmetic mean of a range of numbers. Syntax: =AVERAGE(A1:A10). It adds all values and divides by the count of numeric values. Related functions: SUM (total), MEDIAN (middle value), COUNT (count of numbers), MODE (most frequent value).

Uploaded by: Fani Warraich

MCQs Section QUESTION #4913

Question 8619

A recent study of ancient clay deposits has provided new evidence _____ contributed to the extinction of the dinosaurs and many other creatures some 65 million years ago.

supporting the theory of global forest fires ignited by a meteorite impact that
supporting the theory that global forest fires ignited by a meteorite impact✔️
that supports the theory of global forest fires that were ignited by a meteorite impact and that
in support of the theory that global forest fires were ignited by a meteorite impact and that

Correct Answer Logic:

It clearly expresses the theory: global forest fires ignited by a meteorite impact contributed to the extinction. In option A, the pronoun 'that' ambiguously modifies either 'meteorite impact' or 'fires.' Options C and D add unnecessary 'and that,' creating grammatical awkwardness. Option E changes the meaning by implying the meteorite directly caused the extinction rather than the forest fires.

Uploaded by: Fani Warraich

Chemistry QUESTION #7134

Question 8620

An ideal gas undergoes an isothermal expansion from $1\text{ dm}^3$ to $10\text{ dm}^3$ at $300\text{ K}$ against a constant external pressure of $1\text{ bar}$. Determine the change in entropy of the surroundings ($\Delta S_{surr}$) in $\text{J K}^{-1}$.

$3.0$
$-3.0$✔️
$2.5$
$-2.5$

Correct Answer Logic:

In an irreversible expansion against constant external pressure, the work done by the gas is $w = -P_{ext}\Delta V = -1 \text{ bar} \times (10 - 1) \text{ dm}^3 = -900\text{ J}$. For an isothermal process of an ideal gas, $\Delta U = 0$, so $q_{sys} = -w = 900\text{ J}$. The heat gained by the surroundings is $q_{surr} = -q_{sys} = -900\text{ J}$. Thus, $\Delta S_{surr} = \frac{q_{surr}}{T} = \frac{-900}{300} = -3.0\text{ J K}^{-1}$.

Uploaded by: Fani Warraich

More Options

Suggest a Question