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Boilers Mechanical Engineering QUESTION #2484

A 'dyad' in Assur group theory is a system group consisting of:

One link and one kinematic pair
Two links and two full kinematic pairs
Two links and three full kinematic pairs (zero DOF group)✔️
Three links and four kinematic pairs

Correct Answer Logic:

An Assur dyad is the simplest system group (zero-DOF group): 2 links ($n=2$) and 3 full (5th-class) kinematic pairs ($c_5=3$), satisfying $3n-2c_5=3(2)-2(3)=0$.

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Boilers Mechanical Engineering QUESTION #2495

Question 2

Hooke's Law in shear relates shear stress $\tau$ and shear strain $\gamma$ via the modulus of rigidity $G$. The relationship between $E$, $G$, and Poisson's ratio $\nu$ is:

$E = G(1 + \nu)$
$E = 2G(1 - \nu)$
$E = 2G(1 + \nu)$✔️
$E = G/(2\nu)$

Correct Answer Logic:

From elasticity theory, the three elastic constants are related by $E = 2G(1+\nu)$. For steel: $E \approx 207$ GPa, $G \approx 79.3$ GPa, $\nu \approx 0.292$.

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English QUESTION #2652

Question 3

Convert to passive: 'Who wrote this book?'

By whom was this book written?
This book was written by whom?
Who was this book written by?
All of the above✔️

Correct Answer Logic:

All three forms are grammatically correct ways to turn an interrogative sentence into passive voice.

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Chemistry QUESTION #7391

Question 4

The liquefied metal that expands on solidification is:

Ga✔️
Al
Zn
Cu

Correct Answer Logic:

Gallium (Ga) is one of the few substances (like water and bismuth) that expands on solidification. This is due to its unusual crystal structure in the solid state, where Ga–Ga covalent bonds result in a less dense solid than the liquid. Gallium has a very low melting point (29.76°C) and is liquid at or slightly above room temperature.

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English QUESTION #2703

Question 5

Identify the word for: 'One who is present everywhere'?

Omnipotent
Omniscient
Omnipresent✔️
Universal

Correct Answer Logic:

'Omni' means all, and 'present' refers to location.

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English QUESTION #7550

Question 6

Choose the most appropriate meaning of the idiomatic phrase "To take something with a pinch of salt"

To treat something with scepticism.✔️
To accept something immediately.
To exaggerate a statement.
To refuse to listen.

Correct Answer Logic:

To take something with a pinch of salt means to view something with doubt or skepticism

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Islamic Studies QUESTION #7617

Question 7

تلمود (Talmud) کس مذہب کی مقدس کتاب ہے؟

ہندو
یہودی✔️
عیسائی
بدھ مت

Correct Answer Logic:

تلمود یہودی مذہب کی ایک اہم کتاب ہے جو مشنا اور جمارا پر مشتمل ہے، اور یہ تورات کے بعد دوسری اہمیت رکھتی ہے۔

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Paper-I (Anatomy/Physiology and Biochemistry/Microbiology) QUESTION #3514

Question 8

What is the biological source of 'Turmeric' (Haldi)?

Curcuma longa✔️
Zingiber officinale
Crocus sativus
Allium sativum

Correct Answer Logic:

Turmeric comes from the rhizomes of Curcuma longa.

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Chemistry QUESTION #7167

Question 9

Under what specific conditions can the Tyndall effect be clearly observed?

Particle diameter is much smaller than the wavelength; refractive indices are similar
Particle diameter is not much smaller than the wavelength; refractive indices are similar
Particle diameter is much smaller than the wavelength; refractive indices differ significantly
Particle diameter is not much smaller than the wavelength; refractive indices differ significantly✔️

Correct Answer Logic:

The Tyndall effect is the scattering of light by colloidal particles. It is observed only when:

The diameter of the dispersed particles is not much smaller than the wavelength of light used.
The refractive indices of the dispersed phase and the dispersion medium differ greatly in magnitude.

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Geography QUESTION #1250

Question 10

Grand Banks is situated in:

NE North America✔️
NW Europe
East Asia
None of these

Correct Answer Logic:

The Grand Banks is a series of underwater plateaus (continental shelves) located southeast of Newfoundland, Canada — in the northwestern North Atlantic Ocean, off the northeast coast of North America. It is one of the world's richest fishing grounds, where the cold Labrador Current meets the warm Gulf Stream, creating ideal conditions for marine life.

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General Ability and Fire Fighting QUESTION #5623

Question 11

The concept of 'exposure protection' in firefighting refers to:

Protecting firefighters from heat radiation
Preventing fire from spreading to neighboring structures or areas✔️
Monitoring the fire for chemical exposure
Covering the building during overhaul

Correct Answer Logic:

Exposure protection means safeguarding structures

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Chemistry QUESTION #1420

Question 12

In an electrolytic cell:

Electrons move from cathode to anode
The anode is negative
Energy is consumed to drive the reaction✔️
None of these

Correct Answer Logic:

In an electrolytic cell, electrical energy is supplied from an external source to drive a non-spontaneous chemical reaction (electrolysis). The anode is positive (oxidation occurs) and cathode is negative (reduction occurs) — the opposite of a galvanic cell. Electrons flow from the external power source into the cathode. Energy is consumed, not produced.

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Islamic Studies QUESTION #7932

Question 13

The Zaboor was revealed on:

Hazrat Musa
Hazrat Isa
Hazrat Dawood✔️
Hazrat Muhammad (S.A.W)

Correct Answer Logic:

Zaboor (Psalms) was revealed to Hazrat Daud (David) AS. It is one of the four major revealed books in Islam (along with Torah, Gospel, and Quran). The Zaboor contained hymns and prayers praising Allah. Hazrat Daud (AS) was blessed with a beautiful voice and would recite Zaboor, causing birds and mountains to glorify Allah with him.

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Accounting & Finance QUESTION #6171

Question 14

If an investor receives $1,000 at the end of each year for 10 years, this is classified as a(n):

Annuity Due
Perpetuity
Ordinary Annuity✔️
Deferred Perpetuity

Correct Answer Logic:

Lesson 07 defines an Ordinary Annuity as a series of equal payments occurring at the end of each period.

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Pakistan Affairs QUESTION #4677

Question 15

The AFPAK policy was announced by the Obama administration in which year?

2008
2009✔️
2007
2010

Correct Answer Logic:

The AFPAK (Afghanistan-Pakistan) policy was announced by President Barack Obama in March 2009. It combined the US strategies for Afghanistan and Pakistan into a single regional policy framework.

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Physics QUESTION #412

Question 16

Which of the following has the highest resistivity?

Germanium
Silver✔️
Copper
Platinum

Correct Answer Logic:

Among these, Germanium has highest resistivity (semiconductor)

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Urdu QUESTION #5194

Question 17

اردو زبان کا پہلا عوامی شاعر کسے کہا جاتا ہے؟

علامہ اقبال
نظیر اکبرآبادی✔️
حبیب جالب
ساحر لدھیانوی

Correct Answer Logic:

نظیر اکبرآبادی کو اردو کا پہلا عوامی شاعر کہا جاتا ہے کیونکہ انہوں نے عام لوگوں کی زندگی پر شاعری کی۔

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Mathematics QUESTION #4162

Question 18

Using Newton-Raphson method for $f(x) = \cos(x) - x = 0$ starting with $x_0 = \frac{\pi}{4}$, what is $x_1$?

$\frac{\pi}{4} - \frac{\cos(\pi/4) - \pi/4}{-\sin(\pi/4) - 1}$✔️
$\frac{\pi}{4} - \frac{\cos(\pi/4) - \pi/4}{-\sin(\pi/4)}$
$\frac{\pi}{4} + \frac{\cos(\pi/4) - \pi/4}{\sin(\pi/4) + 1}$
$\frac{\pi}{4} - \frac{\cos(\pi/4)}{\sin(\pi/4)}$

Correct Answer Logic:

Newton-Raphson: $x_{n+1} = x_n - \frac{f(x_n)}{f'(x_n)}$. Here $f'(x) = -\sin(x) - 1$. So $x_1 = x_0 - \frac{\cos(x_0) - x_0}{-\sin(x_0) - 1}$.

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Administration QUESTION #2949

Question 19

What does "Equity Theory" suggest regarding employee motivation?

Employees are motivated only by the absolute amount of their salary
Motivation depends on the perceived fairness of rewards relative to inputs✔️
All employees should be paid exactly the same regardless of performance
None of these

Correct Answer Logic:

Equity theory posits that employees compare their input/outcome ratio with that of others to determine if they are being treated fairly.

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Chemistry QUESTION #7126

Question 20

What is the specific reaction intermediate formed during the addition of $HOCl$ (aqueous chlorine) to propene?

$CH_{3}-CH^{+}-CH_{2}-Cl$✔️
$CH_{3}-CH(OH)-CH_{2}^{+}$
$CH_{3}-CH(Cl)-CH_{2}^{+}$
$CH_{3}-CH^{-}-CH_{2}-Cl$

Correct Answer Logic:

The reaction follows Markovnikov's rule. The electrophile $Cl^+$ attacks the double bond of propene ($CH_3-CH=CH_2$) to form the more stable secondary carbocation: $CH_3-CH^+-CH_2-Cl$. Subsequently, the nucleophile $OH^-$ attacks this carbocation.

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