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What is the main reason for using a thermos flask?a) To keep hot liquids hot and cold liquids cold.b) To prevent liquids from evaporating.c) To measure temperature accurately.d) To increase the boiling point of liquids.Correct answer is option 'A'. Can you explain this answer? for Grade 4 2025 is part of Grade 4 preparation. The Question and answers have been prepared according to the Grade 4 exam syllabus. Information about What is the main reason for using a thermos flask?a) To keep hot liquids hot and cold liquids cold.b) To prevent liquids from evaporating.c) To measure temperature accurately.d) To increase the boiling point of liquids.Correct answer is option 'A'. Can you explain this answer? covers all topics & solutions for Grade 4 2025 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for What is the main reason for using a thermos flask?a) To keep hot liquids hot and cold liquids cold.b) To prevent liquids from evaporating.c) To measure temperature accurately.d) To increase the boiling point of liquids.Correct answer is option 'A'. Can you explain this answer?.

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