8/10/2019 Chemistry Practice Paper SA1 Class 9 CBSE

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PRACTICE PAPER CLASS 9 CHEMISTRY

Q1. Choose the correct option:1.The property to flow is unique to fluids. Which one of the followingstatement is correct?

(a) Only gases behave like fluids

(b) Gases and solids behave like fluids

(c) Gases and liquids behave like fluids

(d) Only liquids are fluids

2. During summer, water kept in an earthen pot becomes cool because of the

phenomenon of

(a) diffusion (b) transpiration

(c) osmosis (d) evaporation

3. A few substances are arranged in the increasing order of forces of attractionbetween their particles. Which one of the following represents a correct

arrangement?

(a) Water, air, wind

(b) Air, sugar, oil

(c) Oxygen, water, sugar

4. On converting 25C, 38C and 66C to kelvin scale, the correct sequence of

temperature will be

(a) 298 K, 311 K and 339 K(b) 298 K, 300 K and 338 K

(c) 273 K, 278 K and 543 K

(d) 298 K, 310 K and 338 K

5. Choose the correct statement of the following

(a) conversion of solid into vapours without passing through the liquid

state is called vapourisation.

(b) conversion of vapours into solid without passing through the liquid

state is called sublimation.

(c) conversion of vapours into solid without passing through the liquidstate is called freezing.(d) conversion of solid into liquid is called sublimation.

6. Which condition out of the following will increase the evaporation of water?

(a) Increase in temperature of water

(b) Decrease in temperature of water

(c) Less exposed surface area of water

(d) Adding common salt to water

7.Which of the following is correct for something to be called matter -

(a)It should occupy space(b) It should have mass

8/10/2019 Chemistry Practice Paper SA1 Class 9 CBSE

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(c) Both (a) and (b)

(d) None of these.

8.Gases separated from each other by

(a) fractional evaporation (b) fractional distillation

(c) fractional crystallization (d) fractional sublimation9. Shaving cream is colloidal solution of(a) gas in liquid (b) liquid in liquid

(c) solid in liquid (d) gas in solid

10.Which of the following is correct about solid carbon dioxide

(a)It is used in theatres to give special effects.

(b)It is extremely cold substance.(c)It is used in cold storages and to keep ice-cream cold.

(d)All of them.

Q2. Answer the following Questions:

1. Differentiate between mixtures and compounds?

2. Discuss the properties of hydrogen gas?

3. After rains, wet roads dry quickly. Why?

4. How does perspiration or sweating help in keeping our body cool on a hot

day?

5. Define the terms

a) Latent heat of Fusion b) Latent heat of vaporization

c) Melting point and d) Boiling Point6. Why clothes dry faster when we spread them out.

7. Equal amount of water & alcohol are separately placed in two identical petri

dish. Which will evaporate fasterwater or alcohol. Why?

8. Differentiate between solids, liquids and gases on the bases of:

(a) Density (b) compressibility (c) Kinetic Energy (d) Shape & volume

(e) intermolecular forces (f) Fluidity

9. In a hot summer day, Priyanka&Asha are wearing cotton & nylon clothes

respectively. Who would be more comfortable & why?

10. What is diffusion? What are the factors on which rate of diffusion depends.11. When a liquid boils, its temperature remains the same, so where does theheat go?

12 Why can a sponge be compressed though it is a solid?

13. Carry out following conversion (a) 5000C to Kelvin (b) 200 K to 0C.

14. How much water should be added to 15 g of salt to obtain 15% salt

solution?

15. A solution contains 5.6 ml of alcohol mixed with 76 ml of water. Calculatethe concentration of the solution.