Question:
A diver is able to cut through water in a swimming pool. Which property of matter does this observation show?
Answer:
The forces of attraction among the particles of water hold it together. But these forces are not too strong. The force applied by the diver is enough to overcome these forces of attraction. The observation shows the following properties of matter:
- Intermolecular forces in water are not very strong.
- Particles in liquids can be easily displaced from their original position.
- Liquids show reasonable fluidity.
Matter in Our Surroundings
Q 1.
What is SI unit of temperature? Give mathematical relation also.
Q 3.
How matter is classified in terms of physical state?
Q 4.
What do you mean by change in state?
Q 5.
What is evaporation? Why does evaporation cause cooling?
Q 6.
List any five physical properties of liquids.
Q 7.
What do you mean by the term Volume?
Q 8.
What are the ways a gas can be liquefied?
Q 9.
Why solids cannot be compressed like gases?
Q 10.
Define the term Volatile Liquid.
Q 11.
Which state of matter is most easily compressible?
Q 12.
Define transpiration.
Q 13.
Arrange the following substances in increasing order of intermolecular force of attraction: water, sugar, oxygen
Q 15.
Define evaporation.
Q 16.
What are the differences between boiling and evaporation?
Q 17.
What do you mean by the following terms:
a. Evaporation
b. Sublimation
c. Condensation
Q 18.
Our own bodies contain examples of all three states of matter. Can you identify these?
Q 19.
Why is light not considered matter?
Q 20.
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 21.
Define Latent Heat of Fusion and Latent Heat of vaporisation.
Q 22.
How can matter change its state?
Q 23.
How matter is classified in terms of composition?
Q 24.
Why do gases diffuse rapidly?
Q 25.
Why do diffusion become faster at higher temperatures?
Q 26.
What is the physical state of water at the following temperatures? (a) 25 °C (b) 0 °C (c) 100 °C
Q 27.
Which of the following state does not exist at room temperature conditions: a) Solids b) Liquids c) Gas d) Plasma
Q 28.
How vapour is different from gases? Give examples of each.
Q 29.
In which case evaporation of water will be faster i.e. near the sea or far away from the sea.
Q 30.
Convert the temperature of 373°C to the Kelvin scale.
Q 31.
Name the process by which a drop of ink spreads in a beaker of water.
Q 32.
What is the (a) common unit of temperature, and (b) SI unit of temperature ?
Q 33.
What causes evaporation?
OR
Explain evaporation and its cooling effect in terms of kinetic energy of particles.
Q 34.
Give the usual name for the following :Heat required to change the state of a substance without changing the temperature.
Q 35.
The Kelvin temperature is 270 K. What is the corresponding Celsius scale temperature ?
Q 36.
Which of the following are matter?
Chair, Air, Love, Smell, Hate, Almonds, Thought, Cold, Cold drinks, Smell of perfume
Q 37.
Why do solids expand a bit on heating and contract a bit on cooling?
Q 38.
Write the full forms of the following :(a) LPG (b) CNG
Q 39.
Why does the temperature of a substance remain constant during melting and boiling even when heat is being supplied to it continuously?
Q 40.
Is smell of garlic or perfume a matter?
Q 41.
What is the general name of : (a) rigid form of matter ? (b) fluid forms of matter ?
Q 42.
Convert the temperature of 573 K to the Celsius scale.
Q 43.
The Kelvin scale temperature is 0 K. What is the corresponding Celsius scale temperature ?
Q 44.
Write the relation between Kelvin scale and Celsius scale of temperature.
Q 45.
(a) What is evaporation ? State the various factors which affect evaporation.
Why does evaporation cool a liquid ?
Q 46.
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 47.
Convert the following temperature to Celsius scale: (a) 300 K (b) 573 K
Q 48.
Convert the following temperatures:
a. -78.0 °C to Kelvins
b. 775 K to °C
c. 489 K to °C
d. 24 °C to kelvins
Q 49.
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 50.
What are the conditions for 'something' to be called 'matter' ?
