Effect of Heat and Pressure on Matter, Class 9 Science

1. There will be total 20 MCQ in this test.
2. Please keep a pen and paper ready for rough work but keep your books away.
3. The test will consist of only objective type multiple choice questions requiring students to mouse-click their correct choice of the options against the related question number.
4. No negative marking for incorrect choice.
5. Please click on “Finish the Test” when you want to exit.
6. All the best – Happy Studying

1. Particles of matter are continuously moving. What is the effect of rise in temperature on moving particles?

 With rise in temperature, particles move faster

 With rise in temperature, particles stop moving

 With rise in temperature, particles move slowly

 None of the above

Question 1 of 20

2. Latent heat of fusion is the amount of heat energy required to change:

 1 kg of solid into its gaseous state at its boiling point

 1 kg of liquid into its solid state at its freezing point

 1 kg of liquid into its gaseous state at its boiling point

 1 kg of solid into its liquid state at its melting point

Question 2 of 20

3. The hardness of solids is due to the fact that their particles:

 Have strong forces of attraction between them.

 Are held very close to each other.

 Have fixed positions.

  All of the above.

Question 3 of 20

4. Which of the following are the required conditions for the liquefaction of gases?

  High pressure, low temperature

 Low pressure, high temperature

 High pressure, high temperature

 Low pressure, low temperature

Question 4 of 20

5. Why do naphthalene balls disappear with time without leaving any solid behind?

 Due to melting

 Due to freezing

 Due to boiling

  Due to sublimation

Question 5 of 20

6. In which state does water exist at 50° C?

 Liquid

  Solid

 Gas

  None of the above

Question 6 of 20

7. Identify A in the given conversion.

  Fusion

 Sublimation

 Condensation

 Vaporisation

Question 7 of 20

8. Which property of a gas helps to fill a large volume of liquefied petroleum gas (LPG) in cylinders?

 High fluidity

 Low density

 High inflammability

 High compressibility

Question 8 of 20

9. What affects the change of state the most?

 Density

 Heat

 Volume

 Mass

Question 9 of 20

10. The boiling point of alcohol in Kelvin scale is 351K. What will be its boiling point in Celsius scale?

 151°C

 251°C

 78°C

 178°C

Question 10 of 20

11. What happens when a liquid becomes a gas?

 The particles of solid absorb all the heat energy and there occurs no change in the distance between them.

 The particles of liquid absorb heat energy and distance between them increases.

 The particles of liquid absorb heat energy and distance between them decreases.

 The particles of liquid do not absorb heat energy and distance between them increases .

Question 11 of 20

12. Which of the following substances sublime at room temperature?

 Dry ice

 Iodine

 Ammonium chloride

 Camphor

Question 12 of 20

13. What will be the state of a substance below its freezing point?

 Plasma state

 Liquid state

  Gaseous state

 Solid state

Question 13 of 20

14. How does the state of matter change during fusion process?

 Gas changes to solid

 Solid changes to liquid

 Gas changes to liquid

  Liquid changes to gas

Question 14 of 20

15. What happens when ice is heated?

 Molecules move away from each other and ice changes into water.

 Molecules come closer and ice changes into water.

 Ice absorbs all the heat without change in state.

 None of the above.

Question 15 of 20

16. The temperature at which a liquid changes into its gaseous form is called _________.

 boiling point

 melting point

 freezing point

 triple point

Question 16 of 20

17. When water solidifies to ice, then heat is _______.

 Remains constant

 Absorbed

 Depending on the condition it may be absorbed or evolved.

 Evolved

Question 17 of 20

18. Which of the following pictures represents the arrangement of particles in liquids?

 Picture 1

 Picture 1 as well as picture 2

  Picture 2

  Picture 2 as well as picture 3

Question 18 of 20

19. The boiling point of water and melting point of ice are _______ and _______ respectively.

 273 K ; 0°C

 0°C ; 273 K

 100 K ; 100 K

 373 K ; 273 K

Question 19 of 20

20. What will happen to a gas when it is compressed in a cylinder with the help of a piston?

 The gas evaporates.

 The gas gets solidified.

 The gas liquefies.

 No change occurs.

Question 20 of 20

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