CBSE Class 9 Science Matter in Our Surroundings Assignment Set B

 Q 1 What is the normal room temperature?

Q 2 Are the melting point of the solid state and the freezing point of the liquid state of a substance different.

Q 3 A certain substance ‗A‘ cannot be compressed but takes up the shape of any container in which it is placed. What is the physical
state of 'A'?

Q 4 A rubber band changes its shape when stretched. Can it be regarded as solid?

Q 5 What are volatile liquids?

Q 6 Which scale of measuring the temperature is the best?

Q 7 Define diffusion.

Q 8 Is matter continuous or particulate?

Q 9 What are the factors on which evaporation depends?

Q 10 Define humidity.

Q 11 Define evaporation.

Q 12 Why do the states of matter differ?

Q 13 Define melting point.

Q 14 Write the full form of L.P.G. & C.N.G.

1. Matter in Our Surroundings

Q 1 Which of the following is not matter

(a)Plants   (b) smell of food     (c) Stars    (d) Particles of sand

Q 2 From the given list prepare two separate lists one comprising of matter and other comprising of things which are not categorised as matter Iodine, heat, bunch of rose, sound, electricity, rock, feeling of happiness, river Ganga

Q 3 Name the Panch Tatva as described by ancient Indian philosophers.

Q 4 Why cold is not a matter but cold drink is?

Q 5 What property of gases makes them used as convenient domestic fuel?

Q 6 Which of the following will have strongest forces of attraction between its particles? Air, Water, Oxygen, Iron

Q 7 When we add few crystals of copper sulphate to water, after sometime the solution turns blue. Name the process involved in it.

Q 8 Which of the following has fixed shape and fixed volume both (a)1kg Milk (b)1kg of Copper (c)1kg Nitrogen (d)1 kg Water

Q 9 Which of the following objects can be most compressed and why?Coal powder, Chlorine, Ice cream, Milk

Q 10 Particles of copper does not diffuse. Why?

Q 11 Convert the following temperature to Kelvin

(i)57˚C    (ii)13˚C     (iii)100 ˚C

Q 12 Convert the following temperature to degree Celsius

(i)773K     (ii) 333K

Q 13 A substance has definite volume but its shape is not definite. State if the substance is solid, liquid or gas?

 Exam Questions NCERT Class 9 Science Chapter 1 Matter in Our Surroundings

Question. What is the significance of boiling point and melting point of a substance?
Ans : The significance of boiling point and melting point is that it shows the purity of the substance.

Question When we put CuSO4 in water, after some time we find the solution turns blue. Why? Also, on heating it, what change will occur?
Ans : The solution turns blue because of diffusion. On heating the solution, nothing will happen.

Question Give the temperature at which water exists in two different phases/states.
Ans : (i) At 0°C water can be in solid or in liquid state.
(ii) At 100°C water can be in liquid or in gaseous state.

Question The melting point of ice is 273.16 K. What does this mean? Explain in detail.
Ans : Ice is solid at 0°C, i.e. 273 K. The molecules of ice are tightly packed. These molecules have to overcome the force of attraction with which they are held and hence, they gain this heat from the surrounding but the temperature remains the same as their energy is used to overcome the force of attraction between the particles. The particles of ice start vibrating freely and a stage reaches when the solid ice melts and is converted to liquid state at the same temperature,
i.e. 273 K.

Question How can you justify that table is a solid?
Ans : When we apply force on the table it doesn’t change its shape because its inter- molecules are tightly packed, this shows that table is solid.

Question The boiling point of alcohol is 78°C. What is this temperature on Kelvin scale?
Ans : K = °C + 273 = 78 + 273 = 351 K

Question Why are light and sound not considered as matter?
Ans : Light and sound are not considered as matter because they have no mass and do not occupy space.

Click on link below to download CBSE Class 9 Science Matter in Our Surroundings Assignment Set B