CBES Board Class 9 MCQ Quiz Hub

PHYSICAL STATES OF MATTER MCQS CLASS 9

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1. The process in which the solid changes directly into vapors without changing in the liquid state is called




2. Conversion of a liquid to a gas at all temperatures is called




3. The temperature at which the solid starts melting is called




4. At constant pressure the average kinetic energy of gas molecules increases 2 times if




5. The average kinetic energy of gas molecules is directly proportional to




6. The mathematical expression that describes Boyles law is




7. For a certain reaction PV = 2 dm3 atm and volume is 4 dm3 then the corresponding pressure is




8. The molecules of liquid which escape first have




9. The pressure that vapors apply on the surface of the liquid at equilibrium is called




10. On increasing the temperature of amorphous solid they




11. The movement of molecules from higher concentration to lower concentration is called




12. At Mount Everest the water boils at




13. The barometer is invented by




14. The melting and freezing of a substance occurs as




15. If the liquid is heated to increase the kinetic energy then the liquid will




16. Solids whose atoms arrange themselves in different forms are




17. The process in which the vapor molecules are recaptured by the molecules at the liquid surface is called




18. 1 atmospheric pressure is equal to




19. A gas that shields living things on the surface of the earth from harmful UV radiation is




20. In graphite the carbon atoms are arranged in layers of




21. As the molecular mass of gasses increases their density




22. The position of liquid molecules are




23. On applying pressure the volume of gas




24. Boiling point is the temperature at which vapor pressure is




25. In a pressure cooker the pressure applied is




26. If the temperature of any gas is increased its volume




27. An ordered repeating three-dimensional arrangement of particles makes up a




28. The escape of gas molecules from a small hole one after the other is called




29. Force exerted by a gas on unit area of the container is called




30. At constant temperature when pressure is decreased the average kinetic energy of gas molecules