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प्रश्न
Write true or false
Earthquake is a desirable change.
विकल्प
True
False
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उत्तर
False
APPEARS IN
संबंधित प्रश्न
Write short answer.
What are man-made changes ?
State whether the following is physical or chemical changes.
(energy produced) dissolving sugar in water —
State whether the following is physical or chemical changes.
mixing oil with water —
Sublimation is classified as a physical change. Why ?
Solve this crossword by using the clues that follow-
Across
1. Energy in the form of sunlight is absorbed by the green plants in this process.
4. The reddish-brown substance formed over iron in the presence of oxygen and moisture.
5. This change is permanent and irreversible.
6. The process in which a solid directly changes into gaseous state.
Down
1 . It is the change that takes place in case of swinging pendulum of a clock. –
2. Occurrence of this is a non-periodic change as well as a natural change.
3. It is a physical change.
Classify the Following as a Physical Or a Chemical change.
Glowing of an Electric Bulb
Given reason:
Freezing of water to ice and evaporation of water are physical changes.
What will you take into account while identifying the following?
A chemical change in a substance.
Fill in the blanks with the appropriate words of the statement given below:
Heating a piece of iron is considered a __________ change while heating a piece of coal [carbon] is considered a ___________ change.
Match the examples of changes in List I with the correct type of change in List II.
| List I | List II |
| 1. Burning of paper | A: Physical change |
| 2. The ringing of an electric bell | B: Chemical change |
| 3. Curdling of milk | |
| 4. Electric light is switched on | |
| 5. Melting of butter |
