Chapter 1 : MATTER IN OUR SURROUNDINGS

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CLASS : 9 SCIENCE

Name of the Student : *

School : *

District : *

1. Which one of the following sets of phenomena would increase on raising the temperature? *

1 point

(a) Diffusion, evaporation, compression of gases

(b) Evaporation, compression of gases, solubility

(d) Evaporation, solubility, diffusion, compression of gases

2. Natural Gas can be liquefied under specific conditions of temperature and pressure. Identify the correct set of conditions : *

1 point

(a) Low temperature, low pressure

(b) High temperature, low pressure

(d) High temperature, high pressure

3. The property to flow is unique to fluids. Which one of the following statements is correct? *

1 point

(a) Only gases behave like fluids

(b) Gases and solids behave like fluids

(d) Only liquids are fluids

4. During summer, water kept in an earthen pot becomes cool because of the phenomenon of : *

1 point

(a) diffusion

(b) transpiration

(d) evaporation

5. A few substances are arranged in the increasing order of ‘forces of attraction’ between their particles. Which one of the following represents a correct arrangement? *

1 point

(a) Water, air, wind

(b) Air, sugar, oil

(d) Salt, juice, air

6. On converting 25°C to kelvin scale, the temperature will be : *

1 point

(a) 298 K

(b) 273 K

(d) 25 K

7. Choose the correct statement of the following : *

1 point

(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.

(d) conversion of solid into liquid is called sublimation.

8. The boiling points of diethyl ether, acetone and n-butyl alcohol are 35°C, 56°C and 118°C respectively. Which one of the following correctly represents their boiling points in kelvin scale? *

1 point

(a) 306 K, 329 K, 391 K

(b) 308 K, 329 K, 392 K

(d) 329 K, 392 K, 308 K

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

1 point

(a) Increase in temperature of water

(b) Decrease in temperature of water

(d) Adding common salt to water

10. In which of the following conditions, the distance between the molecules of hydrogen gas would increase? (i) Increasing pressure on hydrogen contained in a closed container (ii) Some hydrogen gas leaking out of the container (iii) Increasing the volume of the container of hydrogen gas (iv) Adding more hydrogen gas to the container without increasing the volume of the container *

1 point

(a) (i) and (iii)

(b) (i) and (iv)

(d) (ii) and (iv)

11) A sample of water under study was found to boil at 102°C at normal temperature and pressure. This water freeze at : *

1 point

(a) 0°C

(b) above 0°C

(d) 4°C

12) A student heats a beaker containing ice and water. He measures the temperature of the content of the beaker as a function of time. Which of the following figure would correctly represent the result ? *

1 point

(a)

(b)

(c)

(d)

13) The phenomenon of change of a liquid into the gaseous state at any temperature below its boiling point is called : *

1 point

(a) evaporation

(b) vaporization

(d) condensation

14) Identify the diffusion process : *

1 point

(a) Swelling up of a raisin on keeping in water.

(b) Spreading of virus on sneezing.

(d) Shrinking of grapes kept in thick sugar syrup.

15) Identify the osmosis process : *

1 point

(a) Spreading of virus on sneezing.

(b) Preserving pickles in salt.

(d) oxygen dissolved in water

16) A glass tumbler containing hot water is kept in the freezer compartment of a refrigerator (temperature < 0°C). If you could measure the temperature of the content of the tumbler, which of the following graphs would correctly represent the change in its temperature as a function of time : *

1 point

(a)

(b)

(c)

(d)

17) Look at the given figure and suggest in which of the vessels A,B, C or D the rate of evaporation will be the highest? *

1 point

(a) A

(b) B

(d) D

18) Name the terms used to denote conversion of (i) vapour to solid (ii) solid to vapour : *

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(a) (i) condensation (ii) sublimation

(b) (i) sublimation (ii) sublimation

(d) (i) fusion (ii) sublimation

19) You are provided with a mixture of naphthalene and ammonium chloride by your teacher. The correct order of techniques to separate them is : *

1 point

(a) filtration, evaporation, dissolution

(b) evaporation, filtration, dissolution

(d) dissolution, filtration, evaporation

20) You want to wear your favourite shirt to a party, but the problem is that it is still wet after a wash. What steps would you take to dry it faster? *

1 point

(a) spreading the shirt

(b) putting the shirt under the sun

(d) All the above

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