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प्रश्न
Select the correct answer from the choice given below to complete the sentence
The energy required for completion of a physical change is ______________ when the change is reversed.
विकल्प
released
absorbed
उत्तर
The energy required for completion of a physical change is released when the change is reversed.
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संबंधित प्रश्न
Write true or false for the statement.
Burning of paper and formation of curd are reversible changes
Write true or false for the statement.
Dissolving of solute in a solvent and rusting of iron are both physical changes.
Ripening of fruits is a desirable change.
State three differences between evaporation and boiling
Fill in the blank.
When a candle burns, wax melts. Melting of wax is a ________ change.
Match the columns.
| Column A | Column B |
| 1. a change which cannot be easily reversed | a. man-made change |
| 2 a change that repeats itself at regular intervals | b. chemical chang |
| 3. a change that is made by humans | c. physical change |
| 4. a change in which the original substance cannot be obtained | d. periodic change |
| 5. a change where no new substance is formed | e. irreversible change |
| f . slow change |
Classify the following as physical or chemical change :
Condensation of steam
Fill in the blank.
The process of a liquid changing into a solid is called ________
Select the chemical changes from the following list of changes
Drying of a fruit
State whether the following statements are true or false:
Anaerobic bacteria digest animal waste and produce biogas.
