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Science (086) — AI-generated practice question

AI-generated practice question — model-generated for extra practice, not a previous-year CBSE board question.

Q1. [2] deep initial-understanding
A student conducts Activity 5.2 but forgets to seal the bell jar with vaseline. Why would the results of this experiment be unreliable?
Previous-year CBSE Grade 10 board exam questions, organised by subject and chapter, each with a model answer — free to read and print.