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Q.2)' Why do peoples voices sound differently ?
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that is mainly because the "quality" of the sound. you might have the same pitchand amplitude but the quality of teh sound differentiates the two sounds.
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Q.6)Why is it dangerous to have charcoal fire burning in a badly ventilated room ?
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the burning of charcoal produces carbon monoxide and carbon dioxide. both of them are toxic. in a closed room they take the place of oxygen which is necesssary for breathing.
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Q.11)why a bomber does not drop bomb when it is vertically above the target ?
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because of inertia. the bomb is travelling with the plane when it is dropped it is still in motion. so it keeps moving. the gavity acts on it and it makes a projectile due to that.