Very short and Short Answer Type Questions
- How can we separate a mixture of two liquids?
- Name the process to separate the particles of the colloid.
- How do we test the purity of substances?
- Gases can be easily compressed but not liquids. Why?
- Which gas is called dry ice? Why?
- Differentiate between the three states of matter.
- Why do naphthalene balls kept in woollen clothes disappear after some time?
- Why there is no increase in volume when sugar is dissolved in water?
- Give reasons for the following:
The smell of hot food reaches you several meters away, but to get the smell of cold food you have to go close.
- How does water stored in an earthen pot become cool during summer?
- What type of clothes should we wear in summer?
- Give reasons to justify:
- Water at room temperature is a liquid.
- An iron almirah is a solid at room temperature.
- What is evaporation? What are the factors affecting it?
- Define latent heat of vaporization and latent heat of fusion.
- Are the three states of matter interconvertible? How can they interconvert?
- How does evaporation cause cooling?
- Give reasons:
- Water at room temperature is a liquid.
- An iron almirah is a solid at room temperature.
- How will you show that water vapour is present in the air?
- The boiling point of alcohol is 78%C. Convert this temperature to Kelvin scale.
- Why does the temperature remain constant during the melting of ice even though heat is provided continuously?
- Why does a desert cooler cool better on a hot dry day?
- Can a rubber band change its shape on stretching? Is it a solid?
Long Answer Type Questions
- What are Distillation and Fractional Distillation? What is the basic property that separates the two methods?
- How will you show that particles of matter are in motion?
- Differentiate between Evaporation and Boiling.