MCQ Questions for Class 9 Science: Ch 1 Matter in our Surroundings

MCQ Questions for Class 9 Science: Ch 1 Matter in our Surroundings

1. A form of matter has no fixed shape but it has a fixed volume. An example of this form of matter is
(a) Krypton
(b) Kerosene
(c) Carbon steel
(d) Carbon dioxide
► (b) Kerosene

2. Find the incorrect statement
(a) Low boiling liquids evaporate faster than high boiling liquids.
(b) Cooling is caused during boiling
(c) The normal room temperature is 298 K
(d) Evaporation is a surface phenomenon but boiling is not
► (b) Cooling is caused during boiling

3. What is the physical state of water at 1000 C?
(a) gaseous
(b) Solid
(c) Liquid
(d) All of these
► (a) gaseous

4. The correct procedure of heating iron-sulphur mixture to prepare iron sulphide is: :
(a) Heat the powder mixture at the base of the test tube using a blue flame throughout.
(b) Heat the iron filings and sulphur mixture in the middle of the test tube using yellow flame throughout.
(c) Heat the powder mixture at the top of the test tube using an orange flame throughout.
(d) Heat the iron filings-sulphur mixture at 3/4 quarters of the test tube using a red flame throughout.
► (a) Heat the powder mixture at the base of the test tube using a blue flame throughout.

5. The interparticle forces are the strongest in
(a) Ammonia
(b) Sodium Bromide
(c) Ethyl alcohol
(d) Carbon dioxide
► (b) Sodium Bromide

6. Which property of a gas helps to fill a large volume of liquefied petroleum gas (LPG) in cylinders?
(a) High fluidity
(b) Low density
(c) High inflammability
(d) High compressibility
► (d) High compressibility

7. Rohan visited an LPG unit and found that the gas can be liquified at specific conditions of temperature and pressure. Help him to identify the correct set of conditions.
(a) High temperature and high pressure
(b) Low temperature and low pressure
(c) Low temperature and high pressure
(d) High temperature and low pressure
► (c) Low temperature and high pressure

8. Which of the following statements is incorrect?
(a) Matter is made up of particles
(b) Particles of matter are always in state of motion
(c) Matter is continuous in nature
(d) Particles of matter attract each other
► (c) Matter is continuous in nature

9. Which one of the following set of phenomena would increase on raising the temperature?
(a) Diffusion, evaporation, compression of gases
(b) Evaporation, compression of gases, solubility
(c) Evaporation, diffusion, expansion of gases
(d) Evaporation, solubility, diffusion, compression of gases
► (c) Evaporation, diffusion, expansion of gases

10. Which of the following phenomena always results in the cooling effect?
(a) Condensation
(b) Evaporation
(c) Sublimation
(d) None of these
► (b) Evaporation

11. When heat is constantly supplied by a burner to boiling water, then the temperature of water during vaporisation :
(a) Rises very slowly
(b) Rises rapidly until steam is produced
(c) First rises and then becomes constant
(d) Does not rise at all
► (d) Does not rise at all

12. Which one of the following statements is not true?
(a) The molecules in a solid vibrate about a fixed position
(b) The molecules in a liquid are arranged in a regular pattern
(c) The molecules in a gas exert negligibly small forces on each other, except during collisions
(d) The molecules of a gas occupy all the space available
► (b) The molecules in a liquid are arranged in a regular pattern

13. When water at 0°C freezes to form ice at the same temperature of 0°C, then it:
(a) Absorbs some heat
(b) Releases some heat
(c) Neither absorbs nor releases heat
(d) Absorbs exactly 3.34 x 105J/kg of heat
► (b) Releases some heat

14. The physical state of a matter depends upon
(a) temperature and pressure
(b) temperature only
(c) pressure only
(d) nature of substance
► (a) temperature and pressure

15. Sonali took a 100 ml beaker and filled half the beaker with water and marked the level of water. She dissolved some salt with the help of a glass rod and recorded water level again.
Choose the correct observation related to above activity
(a) The water level increases appreciably
(b) The water level decreases
(c) The water level remains the same
(d) There is little increase in water level
► (c) The water level remains the same

16. Which of the following will produce severe burns ?
(a) Cold water
(b) Hot water
(c) Boiling water
(d) Steam
► (d) Steam

17. 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?
(a) 306 K, 329 K, 391 K
(b) 308 K, 329 K, 392 K
(c) 308 K, 329 K, 391 K
(d) 329 K, 392 K, 308 K
► (c) 308 K, 329 K, 391 K

18. The room temperature on Celsius scale is 25°C. What is the temperature on the Kelvin scale?
(a) 50K
(b) 200K
(c) 300K
(d) 298K
► (d) 298K

19. Particles of matter are continuously moving. What is the effect of rise in temperature on moving particles?
(a) With rise in temperature, particles move faster
(b) With rise in temperature, particles stop moving
(c) With rise in temperature, particles move slowly
(d) None of the above
► (a) With rise in temperature, particles move faster

20. Why do naphthalene balls disappear with time without leaving any solid behind?
(a) Due to melting
(b) Due to freezing
(c) Due to boiling
(d) Due to sublimation
► (d) Due to sublimation

21. Choose the correct statement out of the following. 
(a) Conversion of solid into vapours without passing through the liquid state is called vaporisation
(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 liquid state is called freezing
(d) Conversion of solid into liquid is called sublimation
► (b) Conversion of vapours into solid without passing through the liquid state is called sublimation 

22. Pressure on the surface of a gas is increased. What will happen to the inter-particle forces?
(a) They will remain constant
(b) They will increase
(c) They will decreases
(d) None of these
► (b) They will increase

23. Which of the following is correct order of forces of attraction?
(a) Water > Air > Sand
(b) Air > Sugar > Oil
(c) Air < Water < Sugar
(d) Salt > Air > Juice
► (c) Air < Water < Sugar

24. As the solid melts to form liquid,
(a) compressibility increases
(b) interparticle forces of attraction decreases
(c) the kinetic energy of the particle increases
(d) all of these
► (d) all of these

25. Which of the following statement is not true regarding the characteristic of matter?
(a) Particles of a matter are randomly moving in all directions.
(b) Kinetic energy of the particles increases with a rise in temperature
(c) Kinetic energy of the particles of all maters remains the same at a particular temperature.
(d) Particles of matter diffuse into each other on their own.
► (c) Kinetic energy of the particles of all maters remains the same at a particular temperature.

26. Which of the following does not undergo sublimation? 
(a) Ammonium chloride 
(b) Sodium chloride 
(c) Solid carbon dioxide 
(d) Iodine
► (b) Sodium chloride 

27. Which of the following will not sublimate ?
(a) Camphor
(b) ammonium chloride
(c) bromine
(d) Iodine
► (c) bromine

28. When alcohol is kept in a china dish it evaporates, temperature falls and cooling is produced. Which one is the correct method to record the temperature?
(a) By using a thermometer
(b) By taking help from the teacher.
(c) By smell of alcohol vapour
(d) By touching the surface of china dish
► (a) By using a thermometer

29. In an endothermic process heat is absorbed, in an exothermic process heat is evolved and in an athermic process no thermal change is observed. What is the nature of evaporation of ether?
(a) Athermic
(b) Exothermic
(c) First exothermic then endothermic
(d) Endothermic
► (d) Endothermic

30. Which of the following is not a compound?
(a) marble
(b) washing soda
(c) quick lime
(d) brass
► (d) brass

31. Which of the following is not a property of solids?
(a) Interparticle spaces are minimum
(b) Definite shape and volume
(c) Forces of attraction between the particles are maximum
(d) Particles can move freely within a limited space
► (d) Particles can move freely within a limited space

32. During summer, water kept in earthen pot becomes cool due to phenomenon of
(a) Diffusion
(b) Transpiration
(c) Distillation
(d) Evaporation
► (d) Evaporation

33. How does the state of matter change during the fusion process?
(a) Gas changes to solid
(b) Solid changes to liquid
(c) Gas changes to liquid
(d) Liquid changes to gas
► (b) Solid changes to liquid

34. Solids do not flow because 
(a) of large molecular space between particles 
(b) they do not have definite shape 
(c) they have very strong intermolecular forces in between particles 
(d) all of these
► (c) they have very strong intermolecular forces in between particles 

35. Which of the following does not affect the rate of evaporation? 
(a) Wind speed
(b) Temperature
(c) Humidity
(d) Insoluble impurities
► (d) Insoluble impurities

36. What happens when a liquid becomes a gas?
(a) The particles of solid absorb all the heat energy and there occurs no change in the distance between them.
(b) The particles of liquid absorb heat energy and distance between them increases.
(c) The particles of liquid absorb heat energy and distance between them decreases.
(d) The particles of liquid do not absorb heat energy and distance between them increases.
► (b) The particles of liquid absorb heat energy and distance between them increases.

37. 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
► (a) Increase in temperature of water 

38. Which of the following is needed by surgeons during surgery?
(a) Acid
(b) ether
(c) Ethane
(d) Propanol
► (b) ether
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