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Question
Tick the most appropriate answer.
Photosynthesis requires
Options
heat energy
wind energy
sunlight
sound energy
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Solution
sunlight.
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RELATED QUESTIONS
Fill in the blank
change in which the substance can be brought back to its original state is called a ............... change.
Match the columns
| column A | coulmn B |
| 1. A change which cannot be easily reversed | a. man-made change |
| 2.A change that repeats itself at regular intervals | b. chemical change |
| 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 formade | e. irreversible change |
| f. slow change |
Tick (√) the correct alternative from the choice given for the following statement.
An example of both physical and chemical change is
Make a list of different types of changes with example.
Which of the following are physical changes and which are chemical changes?
Burning of candle wax, Melting of candle wax, Mixing of iron filings and sand, Burning of wood, Breaking a piece of chalk, Burning a piece of paper, Cutting a piece of paper.
Classify the following as a physical or a chemical change.
Drying of wet clothes
Give the reason why the following is considered as chemical changes.
Sulphur when burnt in air evolves a gaseous acidic product.
Classify the following changes as physical and chemical changes
A rough piece of wood is sanded and polished resulting in change in texture, Rusting of a iron nail, Painting the grill, Bending a paper clip, Pounding silver into thin plate, Rolling the chappathi dough into thin wire, Occurrence of day and night, eruption of volcano, burning of matchstick, dosa from the batter, blinking of eyelids, occurrence of a thunderstorm, rotation of the earth, formation of eclipses.
| Sr. No. | Physical changes | Chemical changes |
| 1. | ||
| 2. |
Wood to sawdust:______:: Wood to Ash: Chemical change
Ice, water and water vapour look different and display different ______ properties but they are ______ the same.
