Advertisements
Advertisements
प्रश्न
Tick the most appropriate answer.
Photosynthesis requires
विकल्प
heat energy
wind energy
sunlight
sound energy
Advertisements
उत्तर
sunlight.
APPEARS IN
संबंधित प्रश्न
Explain the following giving an example.
Pure substance
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
Fill in the blank
Chemical change occurs as a result of __________ between two substances.
Classify the following as physical or chemical change :
Formation of curd from milk
What is a physical change ? Give two examples of physical changes.
State whether the following statement is true or false. If false write the correct statement.
Melting of butter and wax are examples of chemical changes.
Water is known as a universal solvent. Why?
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.
Mention a few physical properties of a substance.
Mention some of the different conditions needed for chemical changes to occur.
