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प्रश्न
True or false
Is melting of ice a reversible change?
पर्याय
True
False
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उत्तर
True
APPEARS IN
संबंधित प्रश्न
Write true or false for the statement.
Deforestation is a man-made change
Classify the following changes as physical or chemical:- photosynthesis in plants
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 |
Photosynthesis cannot take place at night.
Fill in the blank.
A change, which alters the composition of a substances, is known as a___________ change.
Change is the law of nature and occurs in our everyday life, at all times and in all places.
Differentiate between the following change with a suitable example.
Periodic and non-periodic change
State which of the following terms connected with change of state of matter i.e.
(a) Melting
(b) Vaporisation
(c) Condensation
(d) Freezing
pertain to –
- Conversion of a liquid into a vapour or gas.
- Conversion of a liquid into a solid.
- Conversion of a solid into a liquid on heating.
What is the difference between dissolution of sugar and burning of sugar ?
Classify the following as physical or chemical properties
The composition of a sample of steel is 98% iron, 1.5% carbon and 0.5% other elements.
