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Class 9 Science CBSE Multiple Choice Questions for matter in our Surroundings





Given below are the Class 9 Science CBSE Multiple Choice Questions for matter in our Surroundings
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Question 1. The quantity of matter present in an object is called its:
a) Weight
b) Gram
c) Mass
d) Density

Question 2. At higher altitudes:
a) Boiling point of a liquid decreases
b) Boiling point of a liquid increases
c) No change in boiling point
d) Melting point of solid increases

Question 3. The boiling point of alcohol is 78oC. What is this temperature in Kelvin scale:
a) 373 K
b) 351 K
c) 375 K
d) 78 K

Question 4. In which phenomena water changes into water vapour below its B.P.?
a) Evaporation
b) Condensation
c) Boiling
d) No such phenomena exist

Question 5. The boiling point of water on Celsius and Kelvin scale respectively is:
a) 373, 273
b) 0, 273
c) 273, 373
d) 100, 373

Question 6. The liquid which has the highest rate of evaporation is:
a) Petrol
b) Nail- polish remover
c) Water
d) Alcohol

Question 7. When we put some crystals of potassium permanganate in a beaker containing water, we observe that after sometime whole water has turned pink. This is due to:
a) Boiling
b) Melting of potassium permanganate crystals
c) Sublimation of crystals
d) Diffusion

Question 8. The state of matter which consists of super energetic particles in the form of ionized gases is called:
a) Gaseous state
b) Liquid state
c) Bose- Einstein condensate
d) Plasma state

Question 9. The force that binds the particles of matter together is known as:
a) Intermolecular space
b) Bond
c) Intermolecular force
d) Nuclear force

Question 10. The change of a liquid into vapour is called:
a) Vapourization
b) Solidification
c) Sublimation
d) None of these

Question 11. Which of the following describes the liquid phase?
a) It has a definite shape and a definite volume
b) It has a definite shape but not a definite volume
c) It has a definite volume but not a definite shape
d) It has neither a definite shape nor a definite volume

Question 12. When a teaspoon of solid sugar is dissolved in a glass of liquid water, what phase or phases are present after mixing:
a) Liquid only
b) Still solid and liquid
c) Solid only
d) None of these

Question 13. Volume of a gas at a particular temperature and on atmospheric pressure is 200 ml. Keeping the temperature constant if pressure is increased to 5 atmosphere, then volume of the gas will be:
a) 100 ml
b) 40 ml
c) 200 ml
d) 205 ml

Question 14. Which of the following statements best explains why a closed balloon filled with helium gas rises in air?
a) Helium is a monatomic gas, whereas nearly all the molecules that make up air, such as nitrogen and oxygen, are diatomic.
b) The average speed of helium atoms is higher than the average speeds of air molecules, and the higher speed of collisions with the balloon walls propels the balloon upward.
c) Because the helium atoms are of lower mass than the average is molecules, the helium gas is less dense than air. The balloon thus weighs less than the air displaces by its volume.
d) Because helium has a lower molar mass than the average air molecules, the helium atoms are in faster motion. This means that the temperature. Hot gases tend to rise.

Question 15. Equal volumes of all gases under similar conditions of temperature and pressure contain equal numbers of molecules. This statement was made by:
a) Gay- lussae
b) Avogadro
c) Berzilius
d) John Dalton

Question 16. Boyle’s law states that the:
a) Pressure of a gas is directly proportional to the temperature at constant volume
b) Pressure of a gas is inversely proportional the volume at constant temperature
c) Volume is directly proportional to the temperature at constant pressure
d) None of the above

Question 17. All gases will occupy zero volume when the temperature is reduced to:
a) 2730C
b) 2730C
c) -2730C
d) 00C

Question 18. Non- reacting gases have a tendency to mix with each other. This phenomenon is known as:
a) Chemical reaction
b) Diffusion
c) Effusion
d) Explosion

Question 19. A gas which obeys the gas laws is known as:
a) An ideal gas
b) A heavier gas
c) A lighter gas
d) A real gas

Question 20. A gas can be compressed to a fraction of its volume. The same volume of a gas can be spread all over a room. The reason for this is that:
a) The volume occupied by molecules of a gas is negligible as compared to the total volume of the gas.
b) Gases consists of molecules which are in a state of random motion
c) Gases consists of molecules having very large inter- molecular space which can be reduced or increased under ordinary conditions
d) None of these

Question 21. What is the term used to describe the phase change of a liquid to a gas?
a) Boiling
b) Condensation
c) Melting
d) None of the above

Question 22. What term is used to describe the phase change of a solid to a liquid?
a) Freezing
b) Melting
c) Boiling
d) None of the above

Question 23. What s the term used to describe the phase change as a liquid becomes a solid?
a) Evaporation
b) Condensation
c) Freezing
d) None of the above

Question 24. Which has the least energetic molecules?
a) Solids
b) Liquids
c) Gases
d) Plasmas

Question 25. In which phase of matter would you expect compound (alcohol exists) at room temperature?
a) Solid
b) Liquid
c) Gas
d) Plasma

Question 26.. Which of these choices will not change the state of matter?
a) Temperature
b) Crushing a crystal
c) Pressure
d) Heat

Question 27. If you leave water in a glass and some molecules turn into a gas, it is called:
a) Condensation
b) Evaporation
c) Extinction
d) Solidification

Question 28. As of the 1990s, scientists have proved the existence of how many states of matter?
a) Two
b) Three
c) Four
d) Five

Question 29. Out of the following which is the densest state of matter?
a) Solids
b) Liquids
c) Gases
d) Plasmas

Question 30. Densities of two gases are in the ratio 1: 2 and their temperatures are in the ratio 2 : 1, then the ratio of their respective pressure is:
a) 1 : 1
b) 1 : 2
c) 2 : 1
d) 4 : 1

Question 31. Which of the following expression at constant pressure represents Charle’s law?

a) VT=constant
b)PV=constant
c) V/T =constant
d) None of the above

Question 32. For an ideal gas number of moles per liter in terms of its pressure P, gas constant R and temperature T is:
a) PT/R
b) PRT 
c) P/RT
d) RT/P

Question 33. Rate of diffusion of a gas is:
a) Directly proportional to its density
b) Directly proportional to its molecular mass
c) Inversely proportional to the square root of its density
d) Inversely proportional to the square root of its molecular mass

Question 34. According to Graham’ law at a given temperature, the ratio of the rates of diffusion rA /rB of gases A and B is given by:
a) (PA / PB) (MA / MB )1/2
b) (MA / MB) (PA / PB)1/2
c) (PB / MB) (PA / MA)1/2
d) (MA / MB)) ( PB / PA)1/2

Question 35. A bottle of ammonia and a bottle of dry hydrogen chloride connected through a long tube are opened simultaneously at both ends, the while ammonium chloride ring first formed will be:
a) At the center of the tube
b) Near the hydrogen chloride bottle
c) Near the ammonia bottle
d) Throughout the length of the tube

Question 36. Select the one that is not a matter:
a) Feeling of hot
b) Smoke
c) Humidity
d) Water



Question 37. Which is incorrect statement:
a) Matter is continuous in nature.
b) Of the three state of matter, the one that is most compact is solid state.
c) In solid state interparticles space (i.e., empty space) is minimum.
d) The density of solid is generally more than that of a liquid.

Question 38. Select the one that when used would be considered as best condition for liquification of a gas:
a) Increasing the temperature
b) Decreasing the pressure
c) Increasing the pressure and decreasing the temperature
d) Decreasing the pressure and increasing the temperature.

Question 39. Select the correct order of evaporation for water, alcohol, petrol and kerosene oil:
a) Water > alcohol > kerosene oil > petrol
b) Alcohol > petrol > water > kerosene oil
c) Petrol > alcohol > water > kerosene oil
d) Petrol > alcohol > kerosene oil > water

Question 40. Which one is a sublime substance?
a) Table salt
b) Sugar
c) Iodine
d) Potassium iodide

Question 41.. S. I. unit of temperature is:
a) Celsius
b) Fahrenheit
c) Kelvin
d) None of these

Question 42. 100 K is equal to:
a) 1830C
b) -1730C
c) 1730C
d) -2730C

Question 43. The process of change of liquid state into gaseous state at constant temperature is known as:
a) Boiling
b) Melting
c) Fuson
d) Evaporation

Question 44. What is Dry Ice?
a) Ice having no water of cry stallisation
b) Ice that has been dried
c) Solid carbon dioxide
d) None of these

Question 45. Which one is a surface phenomenon?
a) Evaporation
b) Boiling
c) Both (a) and (b)
d) None of these

Question 46. Rate of diffusion depends upon:
a) Temperature
b) Surface area
c) Both temperature and surface area
d) None of these

Question 47. Which of the following processes is known as fusion?
a) Change of liquid to solid
b) Change of solid to liquid
c) Change of liquid to vapour
d) Change of gaseous state to solid state

Question 48. The evaporation of a liquid can best be carried out in a:
a) Flask
b) China dish
c) Test tube
d) Beaker

Question 49. The one, in which interparticle forces are strongest, is:
a) Sodium chloride
b) Hydrogen
c) Ether
d) Carbon dioxide

Question 50.  The melting point temperature of the solid state of a substance is 400oC. The freezing point temperature of the liquid state of the same substance will be:
a) 350C
b) 400C
c) 450C
d) Can’t predict

Question 51. Which one will help to accelerate the process of evaporation of a liquid kept in an open china dish?
a) Keeping dish in open
b) Blowing air into the liquid
c) Keeping the dish under a running fan
d) All the above

Question 52. When a gas is compressed keeping temperature constant. It results in:
a) Increase in sped of gaseous molecules
b) Increase in collision among gaseous molecules
c) Decrease in speed of gaseous molecules
d) Decrease in collision among gaseous molecules

Question 53. Pressure of air at sea level is:
a) One atmosphere
b) 760 cm of Hg
c) 76 mm of Hg
d) All are correct

Question 54. Zig-zag movement of the solute particle in a solution is known as
(a) Linear motion
(b) Circular motion
(c) Brownian motion
(d) Curved motion.

Question 55. Gases can be liquified by
(a) increasing pressure
(b) decreasing temperature
(c) both (a) and (b)
(d) decreasing pressure

Question 56.  Density of a substance is defined as
(a) ratio of mass and volume
(b) product of mass and volume
(c) ratio of mass and temperature
(d) product of mass and temperature

Question 57.  Which of the following is not matter
(a) Blood
(b) Moon rock
(c) Electron
(d) Humidity

Question 58.  Which is more effective in cooling?
(a) Ice at 273K
(b) Water at 273 K
(c) Water at 373K
(d) Ice at 373K

Question 59.  0 0 C temperature is equal to
(a) 0 K
(b) 273 K
(c) -273 K
(d) 300 K

Question 60.  The process involving the change of state from solid to gas is called
(a) melting
(b) boiling
(c) fusion
(d) sublimation


 







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