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RRB Group D 3-Dec-2018 Shift 3 Solved Paper
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© examsnet.com
Question : 16
Total: 100
Tooth enamel, made of_______, is degraded by acid, causing tooth decay.
Ammonium Sulphate
Calcium Phosphate
Sodium Chloride
Potassium Nitrate
Validate
Solution:
Tooth enamel, made of Calcium phosphate, is degraded by acid, causing tooth decay. A bacterium in our mouths called Streptococcus mutans converts sugar to lactic acid, which eats tooth enamel.
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