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प्रश्न
Tick the most appropriate answer.
Photosynthesis requires
विकल्प
heat energy
wind energy
sunlight
sound energy
उत्तर
sunlight.
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संबंधित प्रश्न
Classify the following as chemical or physical change:
Melting of butter in a pan
Classify the following as chemical or physical change:
Making a fruit salad with raw fruits
What are reversible and irreversible changes ? Give one example for each.
Fill in the blank
Changes that occur in nature are called ______
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 changes as physical or chemical.
Name the following:
The term involved in the change of state from – ‘water to ice’ – which is a physical change.
Give a reason why
Change of seasons is a periodic change while the change of weather is a non-periodic change.
Select the correct answer from the choice given below to complete the sentence
A change in which a substance retains its identity is a
______ change.
Two drops of dilute sulphuric acid were added to 1 g of copper sulphate powder and then a small amount of hot water was added to dissolve it (step I). On cooling, beautiful blue coloured crystals got separated (step II). Step I and Step II are:
