Q181:

What is the role of a ‘quality control sample’ in analysis?

• To monitor the accuracy of the analysis
• To calibrate the instrument
• To set the wavelength
• To clean the sample

Correct Answer: Option A

Q182:

What is the effect of a QC sample that is out of range?

• No effect
• It indicates that the analysis is not performing correctly
• It improves accuracy
• It makes the analysis faster

Correct Answer: Option B

Q183:

What is the role of a ‘certified reference material’ (CRM)?

• To validate the accuracy of the method
• To calibrate the instrument
• To set the wavelength
• To clean the sample

Correct Answer: Option A

Q184:

What is the effect of a CRM with an incorrect value?

• No effect
• It can cause the method to be incorrectly validated
• It improves accuracy
• It makes the analysis faster

Correct Answer: Option B

Q185:

What is the role of a ‘method validation’ study?

• To demonstrate that the method is suitable for its intended purpose
• To calibrate the instrument
• To set the wavelength
• To clean the sample

Correct Answer: Option A

Q186:

What is the effect of a method that is not validated?

• No effect
• It cannot be used for reliable analysis
• It improves accuracy
• It makes the analysis faster

Correct Answer: Option B

Q187:

What is the role of a ’round robin test’?

• To compare results from different laboratories
• To calibrate the instrument
• To set the wavelength
• To clean the sample

Correct Answer: Option A

Q188:

What is the effect of a round robin test with high variability?

• No effect
• It indicates that the method is not robust
• It improves accuracy
• It makes the analysis faster

Correct Answer: Option B

Q189:

What is the role of a ‘standard operating procedure’ (SOP)?

• To provide a consistent and reproducible method
• To calibrate the instrument
• To set the wavelength
• To clean the sample

Correct Answer: Option A

Q190:

What is the effect of an SOP that is not followed?

• No effect
• It can cause inconsistent and inaccurate results
• It improves accuracy
• It makes the analysis faster

Correct Answer: Option B

Q191:

What is the role of a ‘proficiency testing’ program?

• To assess the competence of the laboratory
• To calibrate the instrument
• To set the wavelength
• To clean the sample

Correct Answer: Option A

Q192:

What is the effect of a proficiency test failure?

• No effect
• It indicates that the laboratory needs to improve its performance
• It improves accuracy
• It makes the analysis faster

Correct Answer: Option B

Q193:

What is the role of a ‘quality manual’ in a laboratory?

• To document the quality system
• To calibrate the instrument
• To set the wavelength
• To clean the sample

Correct Answer: Option A

Q194:

What is the effect of a quality manual that is not updated?

• No effect
• It can lead to outdated procedures being followed
• It improves accuracy
• It makes the analysis faster

Correct Answer: Option B

Q195:

What is the role of a ‘root cause analysis’ in quality assurance?

• To determine the underlying cause of a problem
• To calibrate the instrument
• To set the wavelength
• To clean the sample

Correct Answer: Option A

Q196:

What is the effect of a root cause analysis that is not performed?

• No effect
• The problem may recur
• It improves accuracy
• It makes the analysis faster

Correct Answer: Option B

Q197:

What is the role of a ‘corrective action’ in quality assurance?

• To correct a problem and prevent its recurrence
• To calibrate the instrument
• To set the wavelength
• To clean the sample

Correct Answer: Option A

Q198:

What is the effect of a corrective action that is not implemented?

• No effect
• The problem will persist
• It improves accuracy
• It makes the analysis faster

Correct Answer: Option B

Q199:

What is the role of a ‘preventive action’ in quality assurance?

• To prevent a potential problem from occurring
• To calibrate the instrument
• To set the wavelength
• To clean the sample

Correct Answer: Option A

Q200:

What is the effect of a preventive action that is not taken?

• No effect
• A potential problem may occur
• It improves accuracy
• It makes the analysis faster

Correct Answer: Option B

{ let category = item.getAttribute("data-category") || ""; if (!category) { const catNum = Math.min(Math.floor(index / 20) + 1, CATEGORY_COUNT); category = "cat" + catNum; } const correctAttr = item.getAttribute("data-correct"); const correctIndex = correctAttr !== null ? parseInt(correctAttr, 10) : 0; const questionHeading = item.querySelector("h3"); const questionText = questionHeading ? questionHeading.textContent.trim() : ""; const optionElements = item.querySelectorAll(".quiz-lib-options-src li"); const options = Array.from(optionElements).map(opt => opt.textContent.trim()).filter(Boolean); const explanationElement = item.querySelector(".quiz-lib-e"); const explanationHTML = explanationElement ? explanationElement.innerHTML.trim() : ""; if (questionText.length > 0 && options.length === 4 && explanationHTML.length > 0) { if (!byCategory[category]) byCategory[category] = []; byCategory[category].push({ question: questionText, options: options, correct: Number.isInteger(correctIndex) ? correctIndex : 0, feedback: explanationHTML }); } }); const selected = []; for (let i = 1; i <= CATEGORY_COUNT; i++) { const pool = byCategory["cat" + i] || []; if (pool.length > 0) { const randomQ = pool[Math.floor(Math.random() * pool.length)]; selected.push(shuffleOptions(randomQ)); } } return selected; } let quizData = []; let currentIndex = 0, rightCount = 0, answeredCount = 0, totalThinkingMs = 0, questionClockMs = 0, questionStart = 0, lastTick = 0; let gameTimer = null, revealTimer = null, countdownTimer = null, answered = false; const container = document.getElementById("kmno4-quiz"); if (!container) return; const screens = { start: document.getElementById("quiz-start-screen"), rules: document.getElementById("quiz-rules-screen"), question: document.getElementById("quiz-question-screen"), reveal: document.getElementById("quiz-reveal-screen"), finished: document.getElementById("quiz-finished-screen") }; const overlay = document.getElementById("quiz-overlay"); const overlayCount = document.getElementById("overlay-count"); const progress = document.getElementById("quiz-progress"); const scoreElement = document.getElementById("quiz-score"); const gameClockElement = document.getElementById("quiz-game-clock"); const questionCountElement = document.getElementById("quiz-question-count"); const questionTextElement = document.getElementById("quiz-question-text"); const optionsContainer = document.getElementById("quiz-options-container"); const startButton = document.getElementById("start-quiz-trigger"); const rulesButton = document.getElementById("rules-ready-trigger"); const restartButton = document.getElementById("quiz-restart-trigger"); function showScreen(name) { const ts = screens[name]; if (!ts) return; Object.values(screens).forEach(s => s && s.classList.remove("active")); ts.classList.add("active"); } function formatClock(ms) { return (ms / 1000).toFixed(1); } function updateScoreDisplay() { if (scoreElement) scoreElement.textContent = `${rightCount}/${answeredCount}`; } function updateGameClock() { if (gameClockElement) gameClockElement.textContent = formatClock(questionClockMs); } function stopQuestionClock() { if (gameTimer) { clearInterval(gameTimer); gameTimer = null; } } function startQuestionClock() { stopQuestionClock(); lastTick = performance.now(); gameTimer = setInterval(() => { const now = performance.now(); questionClockMs += (now - lastTick); lastTick = now; updateGameClock(); }, 100); } function stopRevealTimer() { if (revealTimer) { clearInterval(revealTimer); revealTimer = null; } } function stopCountdownTimer() { if (countdownTimer) { clearInterval(countdownTimer); countdownTimer = null; } } function showCountdown(callback) { stopCountdownTimer(); let count = 3; if (overlayCount) overlayCount.textContent = count; if (overlay) overlay.classList.add("active"); countdownTimer = setInterval(() => { count -= 1; if (count > 0) { if (overlayCount) overlayCount.textContent = count; return; } stopCountdownTimer(); if (overlay) overlay.classList.remove("active"); callback(); }, 1000); } function prepareQuiz() { quizData = buildQuizData(); if (quizData.length === 0) { if (questionTextElement) questionTextElement.textContent = "Question database error."; return false; } return true; } function renderQuestion() { const question = quizData[currentIndex]; if (!question) return; answered = false; questionClockMs = 0; if (progress) progress.textContent = "Challenge In Play"; if (questionCountElement) questionCountElement.textContent = `Question ${currentIndex + 1} of ${quizData.length}`; if (questionTextElement) questionTextElement.textContent = question.question; if (optionsContainer) { optionsContainer.innerHTML = ""; question.options.forEach((optText, i) => { const btn = document.createElement("button"); btn.type = "button"; btn.className = "quiz-opt-btn"; btn.innerHTML = `${optText}`; btn.addEventListener("click", () => handleAnswer(i, btn)); optionsContainer.appendChild(btn); }); } updateGameClock(); showScreen("question"); questionStart = performance.now(); startQuestionClock(); } function handleAnswer(selectedIndex, selectedButton) { if (answered) return; answered = true; stopQuestionClock(); const elapsedMs = performance.now() - questionStart; totalThinkingMs += elapsedMs; const question = quizData[currentIndex]; const isCorrect = (selectedIndex === question.correct); const optionButtons = optionsContainer ? optionsContainer.querySelectorAll(".quiz-opt-btn") : []; optionButtons.forEach((btn, idx) => { btn.disabled = true; if (idx === question.correct) { btn.classList.add("correct"); const icon = btn.querySelector(".quiz-opt-icon"); if (icon) icon.textContent = "✓"; } }); answeredCount += 1; if (isCorrect) rightCount += 1; else { if (selectedButton) { selectedButton.classList.add("wrong"); const icon = selectedButton.querySelector(".quiz-opt-icon"); if (icon) icon.textContent = "✕"; } } updateScoreDisplay(); showReveal(isCorrect ? "correct" : "wrong", isCorrect ? "Correct" : "Calculation Error", "Engineering Insight", `Correct answer: ${question.options[question.correct]}`, question.feedback); } function showReveal(type, badgeText, title, answerText, insightHTML) { const badge = document.getElementById("quiz-result-badge"); const revealTitle = document.getElementById("quiz-reveal-title"); const revealAnswer = document.getElementById("quiz-reveal-answer"); const insight = document.getElementById("quiz-insight-text"); const nextCount = document.getElementById("quiz-next-count"); if (badge) { badge.className = `quiz-result-badge ${type}`; badge.textContent = badgeText; } if (revealTitle) revealTitle.textContent = title; if (revealAnswer) revealAnswer.textContent = answerText; if (insight) insight.innerHTML = insightHTML; showScreen("reveal"); stopRevealTimer(); let remaining = REVEAL_SECONDS; function updateRevealCountdown() { if (!nextCount) return; const isFinal = (currentIndex + 1 >= quizData.length); nextCount.textContent = isFinal ? `Final result in ${remaining}` : `Next question in ${remaining}`; } updateRevealCountdown(); revealTimer = setInterval(() => { remaining -= 1; updateRevealCountdown(); if (remaining > 0) return; stopRevealTimer(); currentIndex += 1; if (currentIndex >= quizData.length) finishQuiz(); else showCountdown(renderQuestion); }, 1000); } function finishQuiz() { stopQuestionClock(); stopRevealTimer(); stopCountdownTimer(); if (progress) progress.textContent = "Challenge Complete"; const timeString = `${(totalThinkingMs / 1000).toFixed(1)}s`; const finalTitle = document.getElementById("quiz-final-title"); const finalScore = document.getElementById("quiz-final-score-line"); const finalRating = document.getElementById("quiz-final-owner-rating"); const finalSummary = document.getElementById("quiz-final-summary"); const totalQuestions = quizData.length; const percentage = Math.round((rightCount / totalQuestions) * 100); const isPerfect = (rightCount === totalQuestions); let ratingMessage = ""; if (isPerfect) ratingMessage = "🏆 Perfect Score — Top 1%"; else if (percentage >= 80) ratingMessage = `⭐ Excellent: ${percentage}% — Master Analytical Engineer`; else if (percentage >= 60) ratingMessage = `🔧 Good: ${percentage}% — Review the missed questions`; else ratingMessage = `📘 ${percentage}% — Review the fundamentals below`; if (finalTitle) finalTitle.textContent = `${rightCount}/${totalQuestions} Correct (${percentage}%)`; if (finalScore) finalScore.textContent = `Analysis Time: ${timeString}`; if (finalRating) finalRating.textContent = ratingMessage; if (finalSummary) finalSummary.textContent = `Most professional builders score 4-6 out of 10 on first attempt. How did you do?`; showScreen("finished"); } function resetQuiz() { stopQuestionClock(); stopRevealTimer(); stopCountdownTimer(); currentIndex = 0; rightCount = 0; answeredCount = 0; totalThinkingMs = 0; questionClockMs = 0; answered = false; prepareQuiz(); updateScoreDisplay(); updateGameClock(); if (progress) progress.textContent = "KMnO₄ Titration"; showScreen("start"); } startButton?.addEventListener("click", () => showScreen("rules")); rulesButton?.addEventListener("click", () => { if (!prepareQuiz()) { alert("Question database error."); return; } currentIndex = 0; showCountdown(renderQuestion); }); restartButton?.addEventListener("click", resetQuiz); document.getElementById("quiz-share-trigger")?.addEventListener("click", function() { const score = document.getElementById("quiz-final-title")?.textContent || ""; const rating = document.getElementById("quiz-final-owner-rating")?.textContent || ""; const text = `I scored ${score} on the KMnO₄ Titration quiz! ${rating}`; if (navigator.share) { navigator.share({ title: "KMnO₄ Quiz Result", text: text }); } else { navigator.clipboard?.writeText(text).then(() => { alert("Result copied to clipboard!"); }).catch(() => { alert(text); }); } }); updateScoreDisplay(); updateGameClock(); } // Deep linking function handleSearchDeepLink() { const params = new URLSearchParams(window.location.search); let questionId = params.get("q") || params.get("question"); if (!questionId && window.location.hash) questionId = window.location.hash.slice(1); if (!questionId) return; questionId = questionId.trim(); if (/^\d+$/.test(questionId)) questionId = "q" + questionId; if (!/^q\d+$/i.test(questionId)) return; window.setTimeout(() => { const targetItem = document.getElementById(questionId.toLowerCase()); if (!targetItem || !targetItem.classList.contains("quiz-lib-item")) return; const categoryItem = targetItem.closest(".kpe-faq-item"); const trigger = categoryItem ? categoryItem.querySelector('.kpe-faq-trigger[type="radio"]') : null; if (trigger) { trigger.checked = true; trigger.dispatchEvent(new Event("change", { bubbles: true })); } document.querySelectorAll("#quiz-library .quiz-lib-item.target-highlight").forEach(item => item.classList.remove("target-highlight")); targetItem.classList.add("target-highlight"); const reduceMotion = window.matchMedia && window.matchMedia("(prefers-reduced-motion: reduce)").matches; window.requestAnimationFrame(() => { targetItem.scrollIntoView({ behavior: reduceMotion ? "auto" : "smooth", block: "center" }); }); }, 200); } if (document.readyState === "loading") { document.addEventListener("DOMContentLoaded", initKMnO4Quiz); document.addEventListener("DOMContentLoaded", handleSearchDeepLink); } else { initKMnO4Quiz(); handleSearchDeepLink(); }