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Pb has fcc structure with edge length of unit cell 495 pm. Radius of Pb atom is
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The coordination number of atoms in bcc crystal lattice is a. 2 b. 4 c. 6 d. 8
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In Frenkel defect a. electrical neutrality of the substance is changed
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It is essential to wear a helmet while driving a two-wheeler because
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You are overtaking a car at night. You must ensure that
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A flashing yellow signal is used when
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You are allowed to park
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A high beam in foggy conditions
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When approaching a crossing where you are to go straight
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You are driving. A vehicle comes up quickly behind, flashing head lamps. You should
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When must you use a dipped / high beam headlight during the day ?
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You are driving in rain. Why should you keep well back from the vehicle in front ?
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In a road without footpath, the pedestrians
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