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Electronics Engineering QUESTION #11741

A thermal imaging camera shows a hot spot on a three-phase bus bar connection at phase B. All three phases carry equal load current. The most probable cause is:

Phase B overloaded compared to A and C
Loose or corroded connection causing increased contact resistance✔️
Ambient temperature variation across the switchboard
Phase B is closer to the heat source of the incoming transformer

Correct Answer Logic:

Under equal current loading, a hot spot on one phase bus connection is almost always caused by a high-resistance joint — loose bolts, corrosion, oxidation, or insufficient contact area. Power dissipated: $P = I^2 R_{contact}$. Even a small increase in contact resistance at high current causes significant heating. The fix is to re-torque, clean, and re-terminate the connection.

Uploaded by: Fani Warraich

General Knowledge QUESTION #4800

Question 1142

The International Day of Peace is observed globally on which date each year?

21st September✔️
23rd September
12th October
1st November

Correct Answer Logic:

The International Day of Peace is observed every year on September 21, established by the United Nations in 1981 (and set to this specific date in 2001) to promote peace and non-violence worldwide.

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Math Physics Chemistry Biology QUESTION #11315

Question 1143

Which of the following is a complementary gene?

A✔️
B
C
D

Correct Answer Logic:

Gene A is an example of a complementary gene.

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Therapeutics and Patient Care QUESTION #3906

Question 1144

Which levothyroxine dosing regimen is considered most appropriate when initiating thyroid hormone replacement in a frail elderly patient?

$5\ \mu\text{g}$ twice daily
$25\ \mu\text{g}$ daily✔️
$75\ \mu\text{g}$ daily
$150\ \mu\text{g}$ daily

Correct Answer Logic:

Frail elderly patients and those with cardiac disease should start at the lowest effective dose ($12.5$–$25\ \mu\text{g}$ daily) to avoid precipitating angina, arrhythmia, or heart failure.

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Math (Module-1) QUESTION #5462

Question 1145

A customer spent $\$27$ to purchase oranges at $\$3$ per pound. How many pounds did the customer purchase?

9✔️
8
10
7

Correct Answer Logic:

$\frac{27}{3} = 9$ pounds.

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Paper-I (Anatomy/Physiology and Biochemistry/Microbiology) QUESTION #3387

Question 1146

'Hemoglobin' is an example of a protein with a:

Primary structure only
Secondary structure only
Tertiary structure only
Quaternary structure✔️

Correct Answer Logic:

It consists of four polypeptide subunits ($2\alpha$ and $2\beta$).

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Chemistry QUESTION #5539

Question 1147

A and B decompose by first-order kinetics with half-lives of 54.0 min and 18.0 min respectively. Starting from equimolar amounts of A and B, find the time (in min) at which $[A] = 16[B]$.

54
108✔️
162
216

Correct Answer Logic:

For equimolar start, $[A]_0 = [B]_0 = C$. $[A] = C\left(\frac{1}{2}\right)^{t/54}$, $[B] = C\left(\frac{1}{2}\right)^{t/18}$. Setting $[A]=16[B]$: $\left(\frac{1}{2}\right)^{t/54} = 16\left(\frac{1}{2}\right)^{t/18}$. $2^{-t/54} = 2^4 \cdot 2^{-t/18}$. $-\frac{t}{54} = 4 - \frac{t}{18}$. $\frac{t}{18}-\frac{t}{54} = 4 \Rightarrow \frac{3t-t}{54}=4 \Rightarrow \frac{2t}{54}=4 \Rightarrow t = 108\ \text{min}$.

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Mathematics QUESTION #6024

Question 1148

If $y = \sec(\tan^{-1}x)$, find $\dfrac{dy}{dx}$ at $x=1$.

$\dfrac{1}{\sqrt{2}}$✔️
$\dfrac{1}{2}$
1
$\sqrt{2}$

Correct Answer Logic:

Let $\theta = \tan^{-1}x$, so $\tan\theta = x$ and $y = \sec\theta$.

$\frac{dy}{dx} = \sec\theta\tan\theta\cdot\frac{d\theta}{dx} = \sec\theta\tan\theta\cdot\frac{1}{1+x^2}$

Since $\tan\theta=x$ and $\sec\theta=\sqrt{1+x^2}$:

$\frac{dy}{dx} = \sqrt{1+x^2}\cdot x\cdot\frac{1}{1+x^2} = \frac{x}{\sqrt{1+x^2}}$

At $x=1$: $\frac{dy}{dx} = \frac{1}{\sqrt{2}}$

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General Knowledge QUESTION #8894

Question 1149

Which of the following has the maximum calories per gram?

Carbohydrates
Proteins
Fats✔️
Vitamins

Correct Answer Logic:

Fats provide about 9 calories per gram (more than carbs/proteins).

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Education QUESTION #6730

Question 1150

A student demonstrates knowledge when explaining concepts to peers but struggles on written tests. This MOST likely indicates:

Lack of true understanding
Need for alternative assessment methods recognizing diverse intelligences✔️
Academic dishonesty
Poor test-taking skills only

Correct Answer Logic:

Multiple intelligences suggest people demonstrate understanding differently. Strong verbal-interpersonal intelligence may not translate to linguistic-written performance. Authentic assessment should include varied methods (oral explanation, demonstration, written work) to capture true understanding.

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General Knowledge QUESTION #4759

Question 1151

One US oil barrel is equivalent to approximately how many litres?

20 litres
30 litres
50 litres
159 litres✔️

Correct Answer Logic:

One US barrel of petroleum is equal to 42 US gallons or approximately 158.987 litres (commonly rounded to 159 litres).

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Academic/Professional (Social Sciences) QUESTION #6484

Question 1152

According to Max Weber, which type of authority is based on the personal qualities of a leader and their ability to inspire followers?

Traditional Authority
Charismatic Authority✔️
Rational-Legal Authority
Bureaucratic Authority

Correct Answer Logic:

Charismatic authority is power legitimized by extraordinary personal abilities that inspire devotion.

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Ability / HR / Governance / Special Education QUESTION #1894

Question 1153

Which two earlier sets of rules were repealed by Rule 11 of GS E&D Rules 1973?

GS E&D Rules 1955 and GS Conduct Rules 1964
GS E&D Rules 1960 and Civilian Employees in Defence Services (Classification Control and Appeal) Rules 1961✔️
GS E&D Rules 1965 and Civil Servants Act 1951
GS E&D Rules 1959 and Federal Public Service Commission Rules 1960

Correct Answer Logic:

Rule 11 specifically repeals the Government Servants (Efficiency and Discipline) Rules 1960 and the Civilian Employees in Defence Services (Classification Control and Appeal) Rules 1961.

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Dairy Food Science and Technology QUESTION #5990

Question 1154

Fortification of milk with Vitamins A and D is most important for which type of milk?

Whole milk
Skim and low-fat milk, because fat-soluble vitamins A and D are removed with the fat during separation✔️
Flavored milk
UHT milk

Correct Answer Logic:

Fat-soluble vitamins A and D are naturally associated with the fat phase of milk. When fat is removed during skimming, these vitamins are also substantially removed. US FDA requires reduced-fat milks to be fortified with Vitamin A at $\geq 2000\;\text{IU/quart}$ and Vitamin D at $\geq 400\;\text{IU/quart}$.

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Paper-II (Pharmacognosy and Pharmaceutics-I) QUESTION #3024

Question 1155

Cocoa butter exhibits 'Polymorphism', which means it:

Can exist in different crystalline forms with different melting points✔️
Turns into gas easily
Is soluble in water
Reacts with all drugs

Correct Answer Logic:

Polymorphism is the ability of a solid to exist in multiple crystalline forms, which can affect stability and melting.

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Chemistry QUESTION #456

Question 1156

Which of the following bonds has minimum bond energy?

C?F
C?Cl
C?I✔️
C?Br

Correct Answer Logic:

C?I bond has lowest energy due to large size of I

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Security Measures to Maintain Law and Order QUESTION #900

Question 1157

To maintain order, "Secondary Screening" is typically triggered when:

A passenger is famous
Primary screening is inconclusive✔️
The flight is international
A passenger is late

Correct Answer Logic:

Secondary screening is a measure to maintain a sterile environment when initial electronic or physical checks fail to clear a threat.

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Paper-I (Pharmaceutics II (Industrial and Quality Control) and Pharmaceutics III (Hospital and Community Pharmacy)) QUESTION #5695

Question 1158

What is the HLB (Hydrophilic-Lipophilic Balance) range for an emulsifying agent used to produce a Water-in-Oil (W/O) emulsion?

$3 - 6$✔️
$8 - 16$
$13 - 15$
$7 - 9$

Correct Answer Logic:

Low HLB values ($3-6$) favor lipophilic properties and W/O emulsions.

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Nursing QUESTION #9190

Question 1159

A Charge Nurse is conducting a study using systematic random sampling from a population of 400 patients. She selects every $k^{th}$ patient after a random start. If the desired sample size is 50, what is the value of $k$?

4
6
8✔️
10

Correct Answer Logic:

Correct Answer: C — $k = 8$

The formula for the sampling interval in systematic random sampling is:

\[k = \frac{N}{n}\]
Where:

$N$ = population size = 400
$n$ = desired sample size = 50

\[k = \frac{400}{50} = 8\]
The nurse randomly selects a starting point between 1 and 8, then selects every 8th patient thereafter (e.g., patient 5, 13, 21, 29...). This method ensures equal probability of selection and is more practical than simple random sampling for large populations.

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Chemistry QUESTION #7172

Question 1160

Which of the following values represents a physically possible energy level for an excited state of a hydrogen atom?

$+13.6 \text{ eV}$
$-6.8 \text{ eV}$
$-3.4 \text{ eV}$✔️
$+6.8 \text{ eV}$

Correct Answer Logic:

The energy of an electron in a hydrogen atom is given by $E_{n} = \frac{-13.6}{n^{2}} \text{ eV}$.

For $n=1$, $E = -13.6 \text{ eV}$ (Ground state)
For $n=2$, $E = \frac{-13.6}{4} = -3.4 \text{ eV}$
For $n=3$, $E = \frac{-13.6}{9} = -1.51 \text{ eV}$

Only $-3.4 \text{ eV}$ matches a valid transition level.

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