50 board-aligned MCQs across Science, Math, and Social Science — full Class 10 revision pack.
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A complete CBSE Class 10 revision pack — 20 Science, 15 Math, 15 SST. NCERT-aligned, Bloom-tagged, PYQ-style. Use as a final mock or split chapter-wise across the year.
Explanation: Magnification m = -v/u = -5 → v = 50 cm. Mirror formula: 1/f = 1/v + 1/u → f = -8.33 cm.
Explanation: Use Euclid's algorithm: 404 = 96×4 + 20; 96 = 20×4 + 16; 20 = 16×1 + 4; 16 = 4×4 + 0. HCF = 4.
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