Advertisements
Advertisements
प्रश्न
Write true or false
Burning of paper and formation of curd are reversible changes.
पर्याय
True
False
Advertisements
उत्तर
False.
Burning of paper and formation of curd are irreversible changes.
APPEARS IN
संबंधित प्रश्न
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 |
Write short answer.
Sublimation is classified as a physical change. Why ?
State the various conditions that favour the process of evaporation.
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
Define physical change. Give two examples for the above changes.
What are man-made changes ?
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.
When a woolen yarn is knitted to get a sweater, the change can be classified as ____________.
______ is the Universal Solvent.
Grinding of wheat grain changes its size. It is a ____________ change.
