Practice questions without fighting the page.

<div class="ai-exp-block"> <b>Explanation:</b> <p>The correct answer is M. N. Roy. In October 1920 at Tashkent, Indian delegates gathered to organize the formation of a Communist Party for India, and M. N. Roy headed this group. The other names listed were prominent Indian leaders in different movements, but they did not lead the Tashkent group for setting up the Communist Party of India.</p> </div> <div class="ai-did-block"> <b>? Did You Know?</b><br> <p>M..N. Roy later became one of the founders of the Communist Party of India in 1925.</p> </div> <div class="ai-remember-block"> <b>? Remember:</b> <p>M. N. Roy headed the Tashkent group that established the Communist Party of India in 1920.</p> </div>

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<div class="ai-chip">? Vocabulary Learning</div>
<div class="ai-answer-card"><b>✅ Correct Answer</b><p>Audacity is the correct synonym.</p></div>
<div class="ai-why-card"><b>? Why?</b><p>Temerity means boldness or willingness to take risks; audacity also means boldness or shameless daring, which is the same idea.</p></div>
<div class="ai-rule-card"><b>? Remember</b><p>Temerity = boldness; audacity = boldness. Look for words that mean courage or daring.</p></div>
<div class="ai-example-card"><b>? Example</b><p>She spoke without fear, showing audacity in front of the crowd.</p></div>
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<b>Widal test</b> is used to diagnose <b>Typhoid</b>. <ul> <li>Key concept: detects serum antibodies (O and H antigens) against <i>Salmonella Typhi</i> in suspected typhoid fever using agglutination.</li> <li>Formula/logic: higher titers against O and/or H antigens indicate infection; rise in paired samples suggests active disease.</li> </ul> <b>Why incorrect options</b> <ul> <li>Cholera, Tuberculosis, AIDS do not use Widal; they require other tests.</li> </ul> <b>Exam tip:</b> Correlate Widal with clinical symptoms and other labs; single high titer may be due to past exposure or vaccination.

<ul> <li><b>Correct option: B — Mitochondrion</b>. It is called the powerhouse because it generates most of the cell’s ATP through cellular respiration.</li> <li><b>Key concept:</b> ATP production; mitochondria have a double membrane and cristae, and host the electron transport chain and oxidative phosphorylation.</li> <li><b>Note:</b> One glucose yields about 30–32 ATP molecules overall in cellular respiration.</li> <li><b>Exam tip:</b> Link “powerhouse” with ATP energy factory in cells.</li> <li><b>Other options:</b> Golgi modifies/ships, Ribosome makes proteins, Lysosome digests waste—these are not primary ATP generators.</li> </ul>

<b>GM</b> stands for <b>Genetically Modified</b> in GM food. <ul> <li>Key concept: Genetic modification inserts or edits genes to give desired traits (pest resistance, yield, etc.).</li> <li>Why correct: Option B directly matches the standard definition used in science and policy.</li> <li>Other options: A and C are incorrect terms; D is false as GM is defined.</li> </ul> <p>Exam tip: Remember common prefixes—“Genetically” indicates inheritance/change at the gene level, not traditional breeding.</p>

<div class="ai-exp-block"> <b>Explanation:</b> <p>Reuven Rivlin was the President of Israel. In November 2016, he visited India as part of a state visit to strengthen ties between the two countries. The correct option is C, Israel. Options A, B, and D refer to Lebanon, the Netherlands, and Switzerland, respectively, which are incorrect in this context. The presidency is a ceremonial-head-of-state role in Israel, distinct from the prime minister who handles daily government work.</p> </div> <div class="ai-did-block"> <b>? Did You Know?</b><br> <p>Israel’s President serves a largely ceremonial role and is elected by the Knesset for a seven-year term.</p> </div> <div class="ai-remember-block"> <b>? Remember:</b> <p>Reuven Rivlin = President of Israel; visited India in November 2016.</p> </div>

Paper pulp is a fibrous material made from plant fiber (softwood) that is the main ingredient in the paper making process. It contains vegetable, mineral, or man-made fibers.

<div class="ai-exp-block"> <b>Explanation:</b> <p>The Doctrine of Lapse was a British policy under Lord Dalhousie which allowed annexation of princely states if the ruler died without a male heir. Jhansi was the state affected under this policy, leading to its annexation when the succession was disputed. This makes Jhansi the correct choice among the options. The other options do not illustrate the Doctrine of Lapse in this context.</p> </div> <div class="ai-did-block"> <b>? Did You Know?</b><br> <p>Doctrine of Lapse was introduced by Lord Dalhousie in the 19th century to expand British control in India.</p> </div> <div class="ai-remember-block"> <b>? Remember:</b> <p>Doctrine of Lapse = annexation if no natural heir; Jhansi is the example here.</p> </div>