Heat
ICSE · Class 7 · Physics
Flashcards for Heat — ICSE Class 7 Physics. Quick Q&A cards covering key concepts, definitions, and formulas.
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Get startedState the definition of heat.
Answer
Heat is a form of energy which flows from a hot body to a cold body when they are kept in contact. The flow continues until both bodies reach the same temperature.
State the definition of temperature.
Answer
Temperature is a quantity which tells us the degree of hotness or coldness of a body. It rises when a body is heated and falls when a body is cooled.
What is the SI unit of heat? Name the other common units.
Answer
The SI unit of heat is joule (J). The other common units are calorie (cal) and kilocalorie (kcal).
How many calories are in 1 kilocalorie?
Answer
Formula: 1 kcal = 1000 cal. This means 1 kilocalorie is equal to 1000 calories.
Convert 5 kcal into cal.
Answer
Given: 5 kcal Find: calories Formula: 1 kcal = 1000 cal Solution: 5 kcal = 5 × 1000 cal = 5000 cal Answer: 5000 cal…
How many joules are equal to 1 calorie?
Answer
Formula: 1 cal = 4.2 J (nearly). Also, 1 J = 0.24 cal. This is used to change heat units between calorie and joule.
Convert 10 cal into joules.
Answer
Given: 10 cal Find: joules Formula: 1 cal = 4.2 J Solution: 10 cal = 10 × 4.2 J = 42 J Answer: 42 J…
State the SI unit of temperature.
Answer
The SI unit of temperature is kelvin (K). The symbol is written simply as K, not as °K.
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