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1833 lines (1771 loc) · 86.6 KB
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=yes, viewport-fit=cover">
<title>COMEDK 2012 · JEE Mains Style Mock Test</title>
<style>
:root {
--bg: #f5f5f5;
--card: #ffffff;
--primary: #1a56db;
--primary-light: #e8f0fe;
--success: #16a34a;
--danger: #dc2626;
--warning: #d97706;
--text: #1e293b;
--text-secondary: #64748b;
--border: #ddd;
--shadow: 0 2px 8px rgba(0, 0, 0, 0.06);
--radius: 8px;
--physics: #1a56db;
--chemistry: #dc2626;
--math: #d97706;
--font-mono: 'SF Mono', 'JetBrains Mono', 'Consolas', monospace;
--nav-bg: #ffffff;
--header-bg: #1a56db;
--header-text: #ffffff;
--palette-notvisited: #e5e7eb;
--palette-visited: #fecaca;
--palette-answered: #bbf7d0;
--palette-marked: #e9d5ff;
}
* {
margin: 0;
padding: 0;
box-sizing: border-box;
}
body {
font-family: Arial, sans-serif;
background: var(--bg);
color: var(--text);
line-height: 1.6;
min-height: 100vh;
-webkit-tap-highlight-color: transparent;
-webkit-font-smoothing: antialiased;
}
.header {
background: var(--header-bg);
color: var(--header-text);
padding: 8px 16px;
display: flex;
align-items: center;
justify-content: space-between;
flex-wrap: nowrap;
gap: 10px;
position: sticky;
top: 0;
z-index: 120;
box-shadow: 0 2px 8px rgba(0, 0, 0, 0.2);
min-height: 52px;
}
.header-left {
display: flex;
align-items: center;
gap: 8px;
flex-shrink: 0;
}
.avatar-circle {
width: 34px;
height: 34px;
border-radius: 50%;
background: #ffffff;
color: #1a56db;
display: flex;
align-items: center;
justify-content: center;
font-weight: 700;
font-size: 0.85rem;
flex-shrink: 0;
border: 2px solid #fff;
}
.candidate-name {
font-weight: 600;
font-size: 0.85rem;
white-space: nowrap;
overflow: hidden;
text-overflow: ellipsis;
max-width: 120px;
}
.header-center {
display: flex;
align-items: center;
gap: 10px;
flex-shrink: 0;
}
.test-title {
font-weight: 700;
font-size: 0.9rem;
white-space: nowrap;
}
.timer-box {
background: #1e3a6e;
padding: 7px 14px;
border-radius: 4px;
font-weight: 700;
font-family: var(--font-mono);
font-size: 1rem;
letter-spacing: 1px;
white-space: nowrap;
border: 1px solid rgba(255, 255, 255, 0.3);
}
.timer-box.warning {
background: #78350f;
animation: pulse 1.2s infinite;
}
.timer-box.danger {
background: #7f1d1d;
animation: pulse 0.7s infinite;
}
@keyframes pulse {
0%,
100% {
opacity: 1;
}
50% {
opacity: 0.6;
}
}
.header-right {
flex-shrink: 0;
}
.btn-submit-header {
background: #dc2626;
color: #fff;
border: none;
padding: 9px 18px;
border-radius: 4px;
cursor: pointer;
font-weight: 700;
font-size: 0.82rem;
letter-spacing: 0.3px;
white-space: nowrap;
min-height: 38px;
transition: background 0.15s;
}
.btn-submit-header:hover {
background: #b91c1c;
}
.subject-tabs-bar {
background: #ffffff;
display: flex;
gap: 0;
border-bottom: 2px solid #e5e7eb;
position: sticky;
top: 52px;
z-index: 110;
box-shadow: 0 1px 4px rgba(0, 0, 0, 0.04);
}
.subject-tab-btn {
flex: 1;
text-align: center;
padding: 11px 4px;
cursor: pointer;
font-weight: 700;
font-size: 0.78rem;
border: none;
background: transparent;
color: var(--text-secondary);
transition: 0.15s;
border-bottom: 3px solid transparent;
min-height: 44px;
letter-spacing: 0.2px;
white-space: nowrap;
}
.subject-tab-btn.active {
color: var(--primary);
border-bottom-color: var(--primary);
}
.subject-tab-btn .tab-count {
font-size: 0.68rem;
font-weight: 500;
color: var(--text-secondary);
display: block;
}
.subject-tab-btn.active .tab-count {
color: var(--primary);
}
.main-container {
display: flex;
max-width: 1400px;
margin: 0 auto;
padding: 8px;
gap: 10px;
min-height: calc(100vh - 160px);
}
.question-panel {
flex: 1;
background: var(--card);
border-radius: var(--radius);
border: 1px solid var(--border);
padding: clamp(14px, 2.5vw, 24px);
display: flex;
flex-direction: column;
gap: 12px;
min-width: 0;
}
.qp-header {
display: flex;
justify-content: space-between;
align-items: center;
flex-wrap: wrap;
gap: 8px;
border-bottom: 1px solid var(--border);
padding-bottom: 10px;
}
.badge {
padding: 5px 14px;
border-radius: 4px;
font-weight: 700;
font-size: 0.75rem;
color: #fff;
letter-spacing: 0.3px;
}
.badge.physics {
background: var(--physics);
}
.badge.chemistry {
background: var(--chemistry);
}
.badge.math {
background: var(--math);
}
.question-num-label {
font-weight: 700;
font-size: 0.9rem;
color: var(--text);
}
.mark-indicator {
color: #7c3aed;
font-weight: 700;
font-size: 0.8rem;
}
.question-text {
font-size: 1rem;
padding: 4px 0;
word-break: break-word;
line-height: 1.7;
}
.question-text img,
.question-text svg {
max-width: 100%;
height: auto;
border-radius: 6px;
margin: 8px 0;
display: block;
}
.options-list {
display: flex;
flex-direction: column;
gap: 8px;
list-style: none;
}
.option-item {
display: flex;
align-items: flex-start;
gap: 10px;
padding: 12px 14px;
border: 2px solid var(--border);
border-radius: 6px;
cursor: pointer;
background: var(--card);
transition: 0.12s;
min-height: 52px;
align-items: center;
}
.option-item:hover {
border-color: #90a4d0;
background: #f8fafc;
}
.option-item.selected {
border-color: var(--primary);
background: var(--primary-light);
font-weight: 600;
}
.option-letter {
width: 32px;
height: 32px;
border-radius: 50%;
background: #e5e7eb;
display: flex;
align-items: center;
justify-content: center;
font-weight: 700;
font-size: 0.9rem;
flex-shrink: 0;
}
.option-item.selected .option-letter {
background: var(--primary);
color: #fff;
}
.action-buttons {
display: flex;
gap: 8px;
flex-wrap: wrap;
padding-top: 8px;
border-top: 1px solid var(--border);
}
.btn {
padding: 10px 16px;
border-radius: 4px;
border: none;
cursor: pointer;
font-weight: 700;
font-size: 0.82rem;
transition: 0.15s;
letter-spacing: 0.2px;
min-height: 44px;
white-space: nowrap;
}
.btn-save-next {
background: #16a34a;
color: #fff;
}
.btn-save-next:hover {
background: #15803d;
}
.btn-clear {
background: #dc2626;
color: #fff;
}
.btn-clear:hover {
background: #b91c1c;
}
.btn-prev {
background: #e5e7eb;
color: #1e293b;
border: 1px solid #d1d5db;
}
.btn-prev:hover {
background: #d1d5db;
}
.btn-mark {
background: #f3e8ff;
color: #7c3aed;
border: 1px solid #c4b5fd;
}
.btn-mark:hover {
background: #ede9fe;
}
.palette-sidebar {
width: 280px;
flex-shrink: 0;
background: var(--nav-bg);
border-radius: var(--radius);
border: 1px solid var(--border);
padding: 12px;
display: flex;
flex-direction: column;
gap: 10px;
max-height: calc(100vh - 160px);
position: sticky;
top: 110px;
overflow: hidden;
}
.palette-title {
font-weight: 700;
font-size: 0.85rem;
text-align: center;
color: var(--text);
}
.palette-legend {
display: flex;
gap: 10px;
flex-wrap: wrap;
font-size: 0.65rem;
justify-content: center;
}
.legend-dot {
display: inline-block;
width: 14px;
height: 14px;
border-radius: 3px;
border: 1px solid #ccc;
vertical-align: middle;
margin-right: 3px;
}
.legend-dot.notvisited {
background: #e5e7eb;
}
.legend-dot.visited {
background: #fecaca;
}
.legend-dot.answered {
background: #bbf7d0;
}
.legend-dot.marked {
background: #e9d5ff;
}
.question-nav {
display: grid;
grid-template-columns: repeat(10, 1fr);
gap: 3px;
overflow-y: auto;
max-height: 380px;
padding-right: 3px;
flex: 1;
}
.q-nav-btn {
aspect-ratio: 1;
border-radius: 3px;
border: 1px solid #d1d5db;
background: #e5e7eb;
cursor: pointer;
font-size: 0.6rem;
font-weight: 600;
display: flex;
align-items: center;
justify-content: center;
color: #6b7280;
transition: 0.1s;
min-width: 22px;
min-height: 22px;
padding: 0;
}
.q-nav-btn:hover {
border-color: #9ca3af;
transform: scale(1.05);
}
.q-nav-btn.answered {
background: #bbf7d0;
border-color: #86efac;
color: #16a34a;
font-weight: 700;
}
.q-nav-btn.visited {
background: #fecaca;
border-color: #fca5a5;
color: #dc2626;
font-weight: 600;
}
.q-nav-btn.marked {
background: #e9d5ff;
border-color: #c4b5fd;
color: #7c3aed;
font-weight: 700;
}
.q-nav-btn.active {
border: 2px solid #1a56db;
font-weight: 800;
box-shadow: 0 0 0 2px rgba(26, 86, 219, 0.3);
z-index: 2;
position: relative;
}
.mobile-bottom-bar {
display: none;
position: fixed;
bottom: 0;
left: 0;
right: 0;
background: #ffffff;
border-top: 2px solid #e5e7eb;
padding: 8px 12px;
z-index: 150;
gap: 8px;
justify-content: center;
}
.btn-questions-drawer {
background: #1a56db;
color: #fff;
border: none;
padding: 12px 24px;
border-radius: 6px;
font-weight: 700;
font-size: 0.9rem;
cursor: pointer;
min-height: 48px;
width: 100%;
max-width: 300px;
}
.mobile-drawer-overlay {
display: none;
position: fixed;
inset: 0;
background: rgba(0, 0, 0, 0.5);
z-index: 200;
}
.mobile-drawer-overlay.open {
display: block;
}
.mobile-drawer {
position: fixed;
bottom: 0;
left: 0;
right: 0;
background: #ffffff;
border-radius: 16px 16px 0 0;
z-index: 210;
padding: 16px;
max-height: 65vh;
overflow-y: auto;
transform: translateY(100%);
transition: transform 0.3s ease;
box-shadow: 0 -4px 20px rgba(0, 0, 0, 0.15);
}
.mobile-drawer.open {
transform: translateY(0);
}
.drawer-handle {
width: 40px;
height: 4px;
background: #d1d5db;
border-radius: 2px;
margin: 0 auto 12px;
}
.drawer-close {
float: right;
background: none;
border: none;
font-size: 1.5rem;
cursor: pointer;
color: #64748b;
min-height: 44px;
min-width: 44px;
}
.modal-overlay {
position: fixed;
inset: 0;
background: rgba(0, 0, 0, 0.6);
z-index: 300;
display: flex;
align-items: center;
justify-content: center;
padding: 16px;
}
.modal {
background: #ffffff;
border-radius: 10px;
padding: clamp(16px, 4vw, 28px);
max-width: 780px;
width: 96%;
max-height: 90vh;
overflow-y: auto;
border: 1px solid #ddd;
}
.result-summary {
display: grid;
grid-template-columns: repeat(auto-fit, minmax(100px, 1fr));
gap: 10px;
margin: 12px 0;
}
.result-card {
background: #f9fafb;
padding: 14px;
border-radius: 8px;
text-align: center;
border: 1px solid #e5e7eb;
}
.result-card .value {
font-size: 1.8rem;
font-weight: 800;
color: #1a56db;
}
.result-card .value.danger {
color: #dc2626;
}
.result-card .value.warning {
color: #d97706;
}
.result-card .value.success {
color: #16a34a;
}
table {
width: 100%;
border-collapse: collapse;
margin: 12px 0;
font-size: 0.85rem;
}
th,
td {
padding: 8px;
border: 1px solid #e5e7eb;
text-align: center;
}
th {
background: #1e293b;
color: #fff;
font-weight: 600;
}
.progress-bar {
height: 6px;
border-radius: 3px;
background: #e5e7eb;
min-width: 60px;
}
.progress-fill {
height: 100%;
border-radius: 3px;
}
.progress-fill.good {
background: #16a34a;
}
.progress-fill.avg {
background: #d97706;
}
.progress-fill.poor {
background: #dc2626;
}
.solution-box {
background: #f0fdf4;
border-left: 5px solid #16a34a;
padding: 12px 16px;
border-radius: 6px;
font-size: 0.85rem;
margin-top: 8px;
display: none;
}
.solution-box.show {
display: block;
}
.solution-box.incorrect {
background: #fef2f2;
border-left-color: #dc2626;
}
.name-input-row {
display: flex;
gap: 8px;
align-items: center;
flex-wrap: wrap;
margin: 10px 0;
}
.name-input-row input {
padding: 10px 14px;
border: 2px solid #ddd;
border-radius: 6px;
font-size: 0.95rem;
flex: 1;
min-width: 150px;
font-family: Arial, sans-serif;
}
.name-input-row input:focus {
outline: none;
border-color: #1a56db;
}
@media (max-width: 900px) {
.palette-sidebar {
width: 240px;
}
.question-nav {
grid-template-columns: repeat(8, 1fr);
}
.subject-tab-btn {
font-size: 0.7rem;
padding: 10px 2px;
}
}
@media (max-width: 768px) {
.palette-sidebar {
display: none;
}
.main-container {
flex-direction: column;
padding: 6px;
min-height: calc(100vh - 190px);
padding-bottom: 80px;
}
.question-panel {
border-radius: 6px;
padding: 12px;
}
.mobile-bottom-bar {
display: flex;
}
.header {
padding: 6px 10px;
gap: 6px;
min-height: 48px;
}
.header-center {
gap: 6px;
}
.test-title {
font-size: 0.7rem;
}
.timer-box {
font-size: 0.8rem;
padding: 5px 10px;
}
.btn-submit-header {
padding: 7px 12px;
font-size: 0.7rem;
min-height: 34px;
}
.candidate-name {
max-width: 70px;
font-size: 0.7rem;
}
.avatar-circle {
width: 26px;
height: 26px;
font-size: 0.7rem;
}
.subject-tabs-bar {
top: 48px;
}
.subject-tab-btn {
font-size: 0.68rem;
padding: 9px 2px;
min-height: 40px;
}
.question-text {
font-size: 0.9rem;
}
.option-item {
padding: 10px 12px;
min-height: 48px;
gap: 8px;
}
.option-letter {
width: 28px;
height: 28px;
font-size: 0.8rem;
}
.btn {
padding: 8px 12px;
font-size: 0.72rem;
min-height: 40px;
}
.action-buttons {
gap: 5px;
}
.question-num-label {
font-size: 0.78rem;
}
.badge {
font-size: 0.68rem;
padding: 4px 10px;
}
}
@media (max-width: 480px) {
.header {
padding: 5px 8px;
gap: 4px;
min-height: 44px;
}
.test-title {
display: none;
}
.timer-box {
font-size: 0.72rem;
padding: 4px 8px;
letter-spacing: 0.5px;
}
.btn-submit-header {
padding: 6px 10px;
font-size: 0.65rem;
min-height: 30px;
}
.candidate-name {
max-width: 55px;
font-size: 0.65rem;
}
.avatar-circle {
width: 22px;
height: 22px;
font-size: 0.6rem;
}
.subject-tabs-bar {
top: 44px;
}
.subject-tab-btn {
font-size: 0.6rem;
padding: 8px 1px;
min-height: 36px;
}
.subject-tab-btn .tab-count {
font-size: 0.55rem;
}
.question-panel {
padding: 8px;
gap: 8px;
}
.question-text {
font-size: 0.82rem;
}
.option-item {
padding: 8px 10px;
min-height: 44px;
gap: 6px;
border-width: 1.5px;
}
.option-letter {
width: 24px;
height: 24px;
font-size: 0.7rem;
}
.btn {
padding: 7px 10px;
font-size: 0.68rem;
min-height: 38px;
}
.action-buttons {
gap: 4px;
}
.q-nav-btn {
font-size: 0.5rem;
min-width: 18px;
min-height: 18px;
}
.mobile-drawer {
max-height: 55vh;
padding: 10px;
}
.question-nav {
grid-template-columns: repeat(8, 1fr);
gap: 2px;
}
.modal {
padding: 12px;
border-radius: 8px;
}
.result-card .value {
font-size: 1.3rem;
}
table {
font-size: 0.7rem;
}
th,
td {
padding: 5px;
}
}
</style>
</head>
<body>
<div class="header" id="headerBar">
<div class="header-left">
<div class="avatar-circle" id="avatarCircle">C</div>
<span class="candidate-name" id="candidateNameDisplay">Candidate</span>
</div>
<div class="header-center">
<span class="test-title">COMEDK 2012</span>
<div class="timer-box" id="timerBox"><span>⏱</span> <span id="timerDisplay">03:00:00</span></div>
</div>
<div class="header-right">
<button class="btn-submit-header" onclick="confirmSubmit()">📝 Submit Test</button>
</div>
</div>
<div class="subject-tabs-bar" id="subjectTabsBar">
<button class="subject-tab-btn active" id="tabPhysics" onclick="switchSubject('physics')">⚛ Physics<span class="tab-count" id="tabCountPhysics">(0/60)</span></button>
<button class="subject-tab-btn" id="tabChemistry" onclick="switchSubject('chemistry')">🧪 Chemistry<span class="tab-count" id="tabCountChemistry">(0/60)</span></button>
<button class="subject-tab-btn" id="tabMath" onclick="switchSubject('math')">📐 Math<span class="tab-count" id="tabCountMath">(0/60)</span></button>
</div>
<div class="main-container" id="mainContainer">
<main class="question-panel" id="questionContent"></main>
<aside class="palette-sidebar" id="paletteSidebar">
<div class="palette-title">📋 Question Palette</div>
<div class="palette-legend">
<span><span class="legend-dot notvisited"></span> Not Visited</span>
<span><span class="legend-dot visited"></span> Not Answered</span>
<span><span class="legend-dot answered"></span> Answered</span>
<span><span class="legend-dot marked"></span> Marked</span>
</div>
<div class="question-nav" id="questionNav"></div>
<div style="text-align:center;font-size:0.7rem;color:#64748b;" id="paletteCandidateName"></div>
</aside>
</div>
<div class="mobile-bottom-bar" id="mobileBottomBar">
<button class="btn-questions-drawer" onclick="openMobileDrawer()">📋 Questions</button>
</div>
<div class="mobile-drawer-overlay" id="mobileDrawerOverlay" onclick="closeMobileDrawer()"></div>
<div class="mobile-drawer" id="mobileDrawer">
<div class="drawer-handle"></div>
<button class="drawer-close" onclick="closeMobileDrawer()">×</button>
<div class="palette-title">📋 Question Palette</div>
<div class="palette-legend" style="margin-bottom:8px;">
<span><span class="legend-dot notvisited"></span> Not Visited</span>
<span><span class="legend-dot visited"></span> Not Answered</span>
<span><span class="legend-dot answered"></span> Answered</span>
<span><span class="legend-dot marked"></span> Marked</span>
</div>
<div class="question-nav" id="mobileQuestionNav" style="max-height:40vh;"></div>
</div>
<div class="modal-overlay" id="resultOverlay" style="display:none;">
<div class="modal" id="resultModal"></div>
</div>
<script type="module">
import { initializeApp } from "https://www.gstatic.com/firebasejs/10.12.0/firebase-app.js";
import { getFirestore, collection, addDoc, serverTimestamp } from
"https://www.gstatic.com/firebasejs/10.12.0/firebase-firestore.js";
const firebaseConfig = {
apiKey: "AIzaSyBz6qXqOpTqQot1GZtJCIwCXnRYg9Hghn4",
authDomain: "comedk-20399.firebaseapp.com",
projectId: "comedk-20399",
storageBucket: "comedk-20399.firebasestorage.app",
messagingSenderId: "111466152803",
appId: "1:111466152803:web:4e6ca3c7f131ca0dbcc956"
};
const app = initializeApp(firebaseConfig);
const db = getFirestore(app);
window.saveScoreToFirebase = async function(name, testName, score, total, accuracy) {
try {
await addDoc(collection(db, "leaderboard"), {
name,
testName,
score,
total,
accuracy,
timestamp: serverTimestamp()
});
console.log("Score saved to Firebase!");
} catch (e) {
console.error("Firebase error:", e);
}
};
</script>
<script>
(function() {
const diagramQ12 =
`<svg width="200" height="140" viewBox="0 0 200 140"><line x1="20" y1="120" x2="180" y2="120" stroke="currentColor"/><line x1="20" y1="120" x2="20" y2="10" stroke="currentColor"/><circle cx="20" cy="120" r="3"/><text x="5" y="135" font-size="10">Q₁</text><circle cx="140" cy="120" r="3"/><text x="128" y="135" font-size="10">Q₂</text><circle cx="80" cy="50" r="3"/><text x="70" y="42" font-size="10">P</text></svg>`;
const diagramQ26 =
`<svg width="220" height="160" viewBox="0 0 220 160"><line x1="30" y1="140" x2="30" y2="20" stroke="currentColor"/><line x1="30" y1="140" x2="200" y2="140" stroke="currentColor"/><text x="5" y="85">p</text><text x="185" y="155">V</text><rect x="70" y="40" width="90" height="80" fill="none" stroke="currentColor" stroke-width="2"/><text x="25" y="45">4</text><text x="25" y="125">2</text><text x="65" y="155">1</text><text x="155" y="155">6</text></svg>`;
const diagramQ38 =
`<svg width="220" height="150" viewBox="0 0 220 150"><line x1="30" y1="130" x2="30" y2="10" stroke="currentColor"/><line x1="30" y1="130" x2="190" y2="130" stroke="currentColor"/><text x="8" y="75">Eₖ</text><text x="175" y="145">ν</text><line x1="60" y1="130" x2="110" y2="20" stroke="currentColor"/><text x="85" y="18">N</text><line x1="100" y1="130" x2="150" y2="20" stroke="currentColor"/><text x="125" y="18">M</text></svg>`;
const diagramQ50 =
`<svg width="180" height="120" viewBox="0 0 180 120"><path d="M 30 90 A 70 70 0 0 1 150 90" fill="none" stroke="currentColor" stroke-width="2"/><circle cx="90" cy="90" r="2"/><line x1="90" y1="90" x2="130" y2="40" stroke="currentColor"/><text x="70" y="70" font-size="10">0.1cm</text></svg>`;
const diagramQ55 =
`<svg width="200" height="130" viewBox="0 0 200 130"><text x="10" y="70">I₀</text><line x1="30" y1="65" x2="70" y2="65" stroke="currentColor"/><ellipse cx="110" cy="65" rx="12" ry="40" fill="none" stroke="currentColor"/><line x1="110" y1="25" x2="110" y2="105" stroke="currentColor" stroke-dasharray="3"/><text x="100" y="20" font-size="10">A</text><ellipse cx="110" cy="65" rx="12" ry="40" fill="none" stroke="currentColor" transform="rotate(25 110 65)"/><text x="120" y="30" font-size="10">B</text><text x="135" y="45" font-size="12">θ</text><line x1="140" y1="65" x2="180" y2="65" stroke="currentColor"/><text x="170" y="60">I_t</text></svg>`;
const diagramQ174 =
`<svg width="200" height="120" viewBox="0 0 200 120"><rect x="40" y="20" width="120" height="70" fill="none" stroke="currentColor"/><line x1="40" y1="90" x2="160" y2="20" stroke="currentColor"/><text x="30" y="15">V₁</text><text x="155" y="15">V₂</text><text x="155" y="110">V₃</text><text x="30" y="110">V₄</text></svg>`;
const physicsQuestions = [
{ id: 1, subject: 'physics',
text: 'Number of neutrons in <sub>92</sub>U<sup>235</sup>',
options: ['327', '235', '143', '92'], correct: 'c', solution: 'N = A−Z = 235−92 = 143.' },
{ id: 2, subject: 'physics', text: 'Reverse saturation current of a diode',
options: ['independent of temperature', 'increases with temperature', 'decreases with temperature',
'may increase or decrease'
], correct: 'b', solution: 'Minority carriers increase with temperature.' },
{ id: 3, subject: 'physics', text: 'Half-life 10 min, 64 nuclei. Decayed after 50 min?',
options: ['2', '5', '59', '62'], correct: 'd', solution: '5 half-lives → 2 remain, 62 decayed.' },
{ id: 4, subject: 'physics', text: 'Carrier of electromagnetic interaction', options: ['gluon', 'photon',
'meson', 'graviton'
], correct: 'b', solution: 'Photon mediates EM force.' },
{ id: 5, subject: 'physics', text: 'NOT gate output when input is 0', options: ['is 1', 'is 0',
'can be 0 or 1', 'is 0 and 1'
], correct: 'a', solution: 'Inverter: 0→1.' },
{ id: 6, subject: 'physics', text: 'LCD stands for', options: ['Light Carrying Diode',
'Liquid Crystal Display', 'Long Crystal Display', 'Light Crystal Display'
], correct: 'b' },
{ id: 7, subject: 'physics', text: 'False statement:', options: ['Sound & light exhibit interference',
'Sound & light exhibit diffraction', 'Light polarises, sound does not',
'Sound polarises, light does not'
], correct: 'd', solution: 'Sound is longitudinal, cannot be polarised.' },
{ id: 8, subject: 'physics', text: 'Relation for optically active solution', options: ['S=θLC', 'θ=SLC',
'L=θSC', 'C=θLS'
], correct: 'b', solution: 'Biot\'s law: θ = S·L·C.' },
{ id: 9, subject: 'physics', text: 'AC supply 50V, Resistor 40V, Inductor voltage?', options: ['10V',
'20V', '30V', '60V'
], correct: 'c', solution: 'V_L = √(50²−40²)=30V.' },
{ id: 10, subject: 'physics', text: '10μF charged to 10V, parallel with uncharged 10μF', options: ['5V',
'10V', '20V', 'Zero'
], correct: 'a', solution: 'Common potential = 5V.' },
{ id: 11, subject: 'physics', text: 'After fusion, specific binding energy of product', options: ['lower',
'equal', 'greater', 'exactly half'
], correct: 'c', solution: 'Fusion releases energy → higher BE/A.' },
{ id: 12, subject: 'physics', text: 'Two charges Q₁=2μC, Q₂=1μC. tanθ at P? ' + diagramQ12,
options: ['1', '2', '3', '4'], correct: 'b',
solution: 'E₁∝2/4=0.5, E₂∝1/1=1. tanθ=E₂/E₁=2.' },
{ id: 13, subject: 'physics', text: 'Force direction on current carrying conductor',
options: ["Fleming's right hand", "Ampere's swimming", "Maxwell's cork screw", "Fleming's left hand"],
correct: 'd' },
{ id: 14, subject: 'physics', text: 'Convex lens F + concave lens F. Equivalent focal length',
options: ['infinity', 'F/2', '2F', 'zero'], correct: 'a',
solution: '1/f = 1/F − 1/F = 0 → f=∞.' },
{ id: 15, subject: 'physics', text: 'x=at+bt². Dimension of b/a', options: ['[LT⁻²]', '[LT⁻¹]', '[T]',
'[T⁻¹]'
], correct: 'd' },
{ id: 16, subject: 'physics', text: 'Velocity 5 east → 5 north in 10s. Avg acceleration',