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प्रश्न
Fill in the blank with the appropriate word of the statement given below:
Change of milk of curd is a _______ change.
उत्तर
Change of milk of curd is a desirable change.
APPEARS IN
संबंधित प्रश्न
Convert the following temperature to Celsius scale:
573 K
Give two reasons to justify an iron almirah is a solid at room temperature.
Convert the temperature of 373° C to the Kelvin scale.
What is meant by saying that the latent heat of fusion of ice is 3.34 × 105 J/kg ?
Define 'boiling point' of a substance ? What is the boiling point of water ?
How is ammonia gas liquefied ?
Define the term 'latent heat of vaporisation' of a liquid. What is the value of the latent heat of vaporisation of water ?
When heat is constantly supplied by a burner to boiling water, then the temperature of water during vaporisation :
When water is cooled to a temperature x, it gets converted into ice at temperature x by a process called P. And when ice at temperature x is warmed, it gets reconverted into water at the same temperature x in a process called Q.
- What is the value of temperature x in Kelvin ?
- What is the process P known as ?
- What is the name of energy released during process P ?
- What is the process Q known as ?
- What is the name of energy absorbed during process Q ?
Define Intermodular space
Why is an egg kicked out of a bottle when air is blown inside the bottle?
A substance which can change its state
Think and try to find a way to demonstrate water cycle in class
Explain the term vaporization
State which of the following statement is true or false. If false write the correct statement.
Atoms/molecules in gases move only about their own positions.
What will happen if....? And why?
A knife is made of wood.
Photosynthesis is a natural process by which green plants manufacture food in the presence of sunlight.
Are any new products formed during the above process.
Give the reason for the following
Solids cannot be compressed, but gases are highly compressible.
Give the reason for the following:
The kinetic energy of molecules of gases is very large & of solids, the least.
Prepare a model to demonstrate movement of particles in solids, liquids and gases.
For making this model you will need
- A transparent jar
- A big rubber balloon or piece of stretchable rubber sheet
- A string
- Few chickpeas or black gram or dry green peas.
How to make?
- Put the seeds in the jar.
- Sew the string to the centre of the rubber sheet and put some tape to keep it tied securely.
- Stretch and tie the rubber sheet on the mouth of the jar.
- Your model is ready. Now run your fingers up and down the string by first tugging at it slowly and then rapidly.
