Class 10 Science Chapter 2
4 Practice Questions — The answers are hidden. Reveal them to check your answers. The Timed Test will be available in Phase 3.
If mouth pH falls below about 5.5, enamel (calcium phosphate) starts dissolving. Bacteria produce acid from sugar, so rinsing and cleaning keeps pH safer.
Link sugar → acid → low pH → enamel damage.
These practice sets use original GKSchools wording — they are not a verbatim dump of the NCERT textbook. “Important” means high-weight practice for the chapter, not a claim that these are previous-year exam questions.
Follow this loop every day: mixed test, current affairs, then today's subject. A new set arrives tomorrow.
After this page, use these three links — do not open a random page.
More sets from the same cluster — stay on this topic.
Timed papers with a scorecard — start any time, then return to a related quiz above.
