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Maxwell added $\frac{\partial \mathbf{D}}{\partial t}$ to Ampere's Law ($\nabla \times \mathbf{H} = \mathbf{J} + \frac{\partial \mathbf{D}}{\partial t}$) to satisfy the continuity equation for time-varying fields.

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Chemistry QUESTION #5580

Question 5984

PCC (Pyridinium chlorochromate) is the most suitable reagent for the oxidation of primary alcohols to aldehydes ($R-CH_2-OH \to R-CHO$) because:

$CrO_3$ oxidizes further to carboxylic acid
PCC selectively stops at the aldehyde stage✔️
$KMnO_4$ is too mild a reagent
$K_2Cr_2O_7$ is selective for aldehydes

Correct Answer Logic:

PCC (Pyridinium chlorochromate, $C_5H_5NH^+CrO_3Cl^-$) is a mild oxidizing agent that converts primary alcohols to aldehydes without over-oxidizing to carboxylic acids. $CrO_3$, $K_2Cr_2O_7$, and $KMnO_4$ are stronger oxidants that convert primary alcohols all the way to carboxylic acids. PCC is the most suitable reagent for $R-CH_2OH \to R-CHO$.

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Chemistry QUESTION #7825

Question 5985

Molar heat of vaporization of water is:

40.7 cal/mol
40.7 J/mol
40.7 kcal/mol
40.7 kJ/mol✔️

Correct Answer Logic:

ΔH_vap of water at 100°C ≈ 40.7 kJ/mol (or 9.7 kcal/mol). 40.7 kcal/mol would be too high.

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Boilers Mechanical Engineering QUESTION #4060

Question 5986

'Non-Destructive Testing' (NDT) includes methods like:

Breaking the boiler with a hammer
Ultrasonic, X-ray, and Dye-penetrant testing✔️
Operating the boiler until it fails
Painting the boiler

Correct Answer Logic:

NDT allows inspection of welds and metal thickness without damaging the component.

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Chemistry QUESTION #1096

Question 5987

Among compounds I (benzene sp$^2$ C–H*), II (phenylacetylene sp C–H*) and III (cyclopropane C–H*), correct order of C–H bond dissociation energy:

III $>$ II $>$ I✔️
II $>$ III $<$ I
II $>$ I $>$ III
I $>$ II $>$ III

Correct Answer Logic:

Bond dissociation energy of C–H bond depends on hybridization of carbon: sp $>$ sp$^2$ $>$ sp$^3$. Compound II (alkyne/phenylacetylene): sp C–H — highest BDE. Compound III (cyclopropane): C–H has partial sp$^2$ character due to ring strain → BDE between sp$^2$ and sp. Compound I (benzene): sp$^2$ C–H. Order: II $>$ III $>$ I. Answer: option (1) III > II > I is wrong. Correct is II > III > I = option (3).

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Education QUESTION #10867

Question 5988

Which is the most basic emotion typically experienced by students in early classes?

Surprise
Withdrawal
Fear✔️
Fighting

Correct Answer Logic:

Fear is one of the most fundamental and earliest emotions in young children and is commonly experienced by students in early school years — fear of failure, fear of the teacher, fear of being wrong, fear of strangers, or fear of new environments. Paul Ekman's research identified fear as one of six basic universal emotions. In educational settings, fear can inhibit learning, making it critical for teachers to create a psychologically safe classroom environment.

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General Knowledge QUESTION #11514

Question 5989

Which internal CPU register keeps track of the memory address for the next instruction to execute?

Program Counter (PC)✔️
Memory Data Register (MDR)
Instruction Register (IR)
Memory Address Register (MAR)

Correct Answer Logic:

The Program Counter (PC), also called the Instruction Pointer, holds the memory address of the next instruction to be fetched and executed. After each instruction fetch, the PC is automatically incremented. It is a critical component of the fetch-decode-execute cycle.

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Maths QUESTION #7959

Question 5990

Evaluate: $\dfrac{8(11-2) - 5(11-2)}{3}$

11
9
1
5✔️

Correct Answer Logic:

$\dfrac{8 \times 9 - 5 \times 9}{3} = \dfrac{72 - 45}{3} = \dfrac{27}{3} = 9$... Answer key gives D (5). Students should verify the original expression from the paper carefully as the printed format may differ.

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Molecular Biology / Bioinformatics / Biochemistry QUESTION #11103

Question 5991

Which gland secretes the hormone glucagon?

Thyroid gland
Pituitary gland
Liver
Pancreas✔️

Correct Answer Logic:

Glucagon is secreted by the alpha (α) cells of the islets of Langerhans in the pancreas. It is released when blood glucose falls below normal (hypoglycaemia) and acts primarily on the liver to: (1) stimulate glycogenolysis (glycogen → glucose), (2) stimulate gluconeogenesis (amino acids/lactate → glucose), and (3) inhibit glycolysis. Glucagon is the primary counter-regulatory hormone to insulin, maintaining glucose homeostasis.

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English QUESTION #8447

Question 5992

Is he eligible _______ this scholarship?

with
of
at
for✔️

Correct Answer Logic:

'Eligible for' is correct.

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Biology Zoology Botany QUESTION #10834

Question 5993

Cytokines follow which type of cell-to-cell signalling?

Paracrine✔️
Autocrine
Intracrine
Neurocrine

Correct Answer Logic:

Cytokines primarily act via paracrine signalling — they are secreted by one cell and act on nearby target cells within the same tissue or organ. However, cytokines can also act in an autocrine manner (acting back on the cell that secreted them — e.g. IL-2 stimulating the T cell that produced it). In systemic inflammation, cytokines can act endocrine (via blood). The primary classification is paracrine for local immune signalling.

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Paper-II (Pharmacognosy and Pharmaceutics-I) QUESTION #3642

Question 5994

'Ipecac' is used in emergency medicine as an 'Emetic'. This means it:

Stops diarrhea
Induces vomiting✔️
Relieves pain
Cures infection

Correct Answer Logic:

Ipecac syrup was historically used to empty the stomach after poisoning.

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Statistics QUESTION #1982

Question 5995

The partial correlation coefficient $r_{12.3}$ between $X_1$ and $X_2$ after eliminating the linear effect of $X_3$ is computed as the simple correlation between:

$X_1$ and $X_2$ directly
The residuals $X_{1.3}$ and $X_{2.3}$ from their respective regressions on $X_3$✔️
The standardized values of $X_1$ and $X_2$
The ranked values of $X_1$ and $X_2$

Correct Answer Logic:

The partial correlation $r_{12.3}$ is defined as the Pearson correlation between the residuals $X_{1.3} = X_1 - \hat{X}_{1|X_3}$ and $X_{2.3} = X_2 - \hat{X}_{2|X_3}$. This removes the linear influence of $X_3$ from both $X_1$ and $X_2$ before computing their correlation.

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General Knowledge QUESTION #11489

Question 5996

MS Word includes built-in graphical images that can be inserted into files, called:

Clip Art✔️
Hyperlinks
Captions
Bookmarks

Correct Answer Logic:

Clip art is the collection of pre-made illustrations and images included with Microsoft Office that can be inserted into documents. In older Word versions it was accessed via Insert → Picture → Clip Art. In Office 365/Word Online, it was replaced by online image search via Bing.

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Education QUESTION #7588

Question 5997

Which assessment technique best captures student attitudes and values?

Objective test
Questionnaire
Rating scale✔️
Matching test

Correct Answer Logic:

Rating scales allow students to express degrees of agreement or frequency, making them effective for measuring subjective constructs like attitudes, values, and feelings.

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Bio-Technology QUESTION #10561

Question 5998

The glyoxylate bypass allows microorganisms growing on C₂ substrates to:

Generate acetyl-CoA from pyruvate
Replenish TCA cycle intermediates (anaplerosis) without losing CO₂✔️
Synthesise fatty acids directly from acetate
Convert oxaloacetate to phosphoenolpyruvate

Correct Answer Logic:

The glyoxylate bypass uses two key enzymes — isocitrate lyase and malate synthase — to convert isocitrate → succinate + glyoxylate, then glyoxylate + acetyl-CoA → malate, without losing CO₂. This allows net synthesis of C₄ oxaloacetate from C₂ acetyl-CoA, replenishing TCA intermediates for biosynthesis. It is essential for growth on acetate, ethanol, or fatty acids.

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English QUESTION #7877

Question 5999

Which word is a synonym for 'elated'?

Confused
Disappointed
Nervous
Overjoyed✔️

Correct Answer Logic:

'Elated' means extremely happy and excited. 'Overjoyed' is the closest synonym. 'Confused', 'disappointed', and 'nervous' are unrelated emotions.

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Paper-I (Anatomy/Physiology and Biochemistry/Microbiology) QUESTION #3152

Question 6000

The 'Spleen' is often referred to as the:

Pump of the body
Graveyard of Red Blood Cells✔️
Site of bile production
Center for logic

Correct Answer Logic:

The spleen filters out old and damaged RBCs.

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