Question:
In which case evaporation of water will be faster i.e. near the sea or far away from the sea.
Answer:
The region nearby sea will be more humid. Since evaporation decreases with an increase in humidity. Therefore, evaporation will be faster in an area far away from the sea.
Matter in Our Surroundings
Q 1.
What is SI unit of temperature? Give mathematical relation also.
Q 3.
What do you mean by change in state?
Q 4.
How matter is classified in terms of physical state?
Q 5.
What is evaporation? Why does evaporation cause cooling?
Q 6.
What do you mean by the term Volume?
Q 7.
Which state of matter is most easily compressible?
Q 8.
What are the ways a gas can be liquefied?
Q 9.
List any five physical properties of liquids.
Q 10.
Define the term Volatile Liquid.
Q 11.
Define transpiration.
Q 12.
Arrange the following substances in increasing order of intermolecular force of attraction: water, sugar, oxygen
Q 13.
Why solids cannot be compressed like gases?
Q 15.
How matter is classified in terms of composition?
Q 16.
The mass per unit volume of a substance is called density (density=mass/volume). Arrange the following in order of increasing density:
Air, Exhaust from chimneys, Honey, Water, Chalk, Cotton and Iron.
Q 17.
Define evaporation.
Q 18.
What are the differences between boiling and evaporation?
Q 19.
Our own bodies contain examples of all three states of matter. Can you identify these?
Q 20.
What do you mean by the following terms:
a. Evaporation
b. Sublimation
c. Condensation
Q 21.
Define Latent Heat of Fusion and Latent Heat of vaporisation.
Q 22.
Why is light not considered matter?
Q 23.
Why do diffusion become faster at higher temperatures?
Q 24.
How can matter change its state?
Q 25.
How vapour is different from gases? Give examples of each.
Q 26.
Which of the following are matter?
Chair, Air, Love, Smell, Hate, Almonds, Thought, Cold, Cold drinks, Smell of perfume
Q 27.
In which case evaporation of water will be faster i.e. near the sea or far away from the sea.
Q 28.
What is the physical state of water at the following temperatures? (a) 25 °C (b) 0 °C (c) 100 °C
Q 29.
Convert the following temperature to Celsius scale: (a) 300 K (b) 573 K
Q 30.
Explain compressibility in gases with an example?
Q 31.
Which of the following state does not exist at room temperature conditions: a) Solids b) Liquids c) Gas d) Plasma
Q 32.
Why does the temperature of a substance remain constant during melting and boiling even when heat is being supplied to it continuously?
Q 33.
Why do gases diffuse rapidly?
Q 34.
Define the following terms:
a. Melting point
b. Freezing point
c. Boiling point
Q 35.
Why is ice at 273 K more effective in cooling than water at the same temperature?
Q 36.
The Kelvin scale temperature is 0 K. What is the corresponding Celsius scale temperature ?
Q 37.
What factors affect the rate of evaporation?
Q 38.
Give reasons for the following observations. The smell of hot sizzling food reaches you several meters away, but to get smell from cold food you have to go close.
Q 39.
Explain with an experiment to show gases do not have fixed shape or volume.
Q 40.
Name the process by which a drop of ink spreads in a beaker of water.
Q 41.
What are the characteristics of matter?
Q 42.
Differences among solids, liquids and gases.
Q 43.
Write the relation between Kelvin scale and Celsius scale of temperature.
Q 44.
The boiling point of water is 100°C. Express this in SI units (Kelvin scale).
Q 45.
What is the (a) common unit of temperature, and (b) SI unit of temperature ?
Q 46.
(a) Define the term 'latent heat of vaporisation' of a liquid. What is the value of the latent heat of vaporisation of water ?
(b) Draw a labelled diagram of the experimental set-up to study the latent heat of vaporisation of water.
Q 47.
A diver is able to cut through water in a swimming pool. Which property of matter does this observation show?
Q 48.
Give reasons to justify: (a) Water at room temperature is a liquid. (b) An iron almirah is solid.
Q 49.
Is smell of garlic or perfume a matter?
Q 50.
The Kelvin temperature is 270 K. What is the corresponding Celsius scale temperature ?
