Practice questions without fighting the page.

<div class="ai-exp-block"> <b>Explanation:</b> <p>Correct option is C: Sarojini Naidu. She was a prominent poet and freedom fighter who interacted closely with leaders of the freedom movement. The phrase “two Mahatmas” refers to her characterization of Mahatma Gandhi and Lord Irwin (the then Viceroy) as two great, guiding figures. Subhas Chandra Bose, Rajendra Prasad, etc., are not credited with this specific phrase. This distinction helps identify Naidu as the speaker in this context.</p> </div> <div class="ai-did-block"> <b>? Did You Know?</b><br> <p>Sarojini Naidu was popularly known as the Nightingale of India and became the first woman to preside over the Indian National Congress.</p> </div> <div class="ai-remember-block"> <b>? Remember:</b> <p>Sarojini Naidu described Gandhi and Lord Irwin as “two Mahatmas.”</p> </div>

<b>Answer: C</b> <ul> <li><b>Why:</b> Optical fibres use <b>total internal reflection</b> (not simple refraction) to trap light inside the core, enabling long-distance transmission. <b>Light as carrier</b> is correct—the light signal carries information.</li> <li><b>Incorrect options:</b> (i) is misleading—refraction alone does not explain fibre guidance. (iv) is false—fibres support very long distances with amplification/ repeater stations.</li> <li>

<b>Correct answer: A</b><br> <ul> <li><b>Reason:</b> Mature human erythrocytes (RBCs) are enucleated; they lose their nucleus to maximize space for hemoglobin that carries oxygen.</li> <li><b>Key concept:</b> Enucleation reduces cell size while increasing hemoglobin content; nucleus absent in mature RBCs but present in many other blood cells and stem/cancer cells.</li> <li><b>Note:</b> Other options (cancer cell, stem cell, leukocyte) possess nuclei.</li> <li><b>Exam tip:</b> If a statement mentions “nucleus absent,” think of mature erythrocytes first.</li> </ul>

<b>Correct option: A</b><br><br> <ul> <li><b>Correct answer text:</b> with : into</li> <li><b>Why:</b> Use <i>with</i> to show people accompanying or inside something (the bus with fifty passengers). Use <i>into</i> to show movement from outside to inside (fell into the river).</li> <li><b>Why others are wrong:</b> A: wrong pairing; B, C, D use incorrect prepositions for both parts (<i>for/upon/on/at</i> do not fit the context).</li> </ul>

<div class="ai-exp-block"> <b>Explanation:</b> <p>Haldia refinery is located in West Bengal. It is situated in Haldia town, in the Purba Medinipur district, near the Hooghly river and the Haldia port. This refinery is a major oil processing facility in eastern India. The other options—Orissa (Odisha), Bihar, and Andhra Pradesh—are incorrect locations for this refinery.</p> </div> <div class="ai-did-block"> <b>? Did You Know?</b><br> <p>IOC stands for Indian Oil Corporation, the company that operates Haldia Refinery.</p> </div> <div class="ai-remember-block"> <b>? Remember:</b> <p>Haldia Refinery is in West Bengal (Haldia, Purba Medinipur).</p> </div>