[A] carbon dioxide [B] dust [C] helium [D] Water vapor Answer: [B] dust
Read more[A] convex lens [B] Flat-convex lens [C] concave lens [D] concave lens Answer: [A] convex lens
Read more[A] concave lens [B] convex lens [C] convex lens [D] concave mirror Answer: [B] convex lens
Read more[A] Galileans [B] Guttenberg [C] Addison [D] by Graham Bell Answer: [A] Galileans
Read more[A] electron [B] protons [C] neutrons [D] None of these Answer: [A] electron
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