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Science, Chemistry
9th
grade
Class 9 |Science|Chapter 1: Matter in Our Surroundings
22 questions
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- 1. Multiple Choice
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
(i) and (iii)
(i) and (iv)
(ii) and (iii)
(ii) and (iv)
- 2. Multiple Choice
When a gas jar full of air is placed upside down on a gas jar full of bromine vapours, the red-brown vapours of bromine from the lower jar go upward into the jar containing air. In this experiment:
Air is heavier than bromine
Both air and bromine have the same density
Bromine is heavier than air
Bromine cannot be heavier than air because it is going upwards against gravity
- 3. Multiple Choice
A form of matter has no fixed shape but it has a fixed volume. An example of this form of matter is
Krypton
Kerosene
Carbon steel
Carbon dioxide
- 4. Multiple Choice
Which one of the following statements is not true?
The molecules in a solid vibrate about a fixed position
The molecules in a liquid are arranged in a regular pattern
The molecules in a gas exert negligibly small forces on each other, except during collisions
The molecules of a gas occupy all the space available
- 5. Multiple Choice
The correct procedure of heating iron-sulphur mixture to prepare iron sulphide is:
Heat the powder mixture at the base of the test tube using a blue flame throughout.
Heat the iron filings and sulphur mixture in the middle of the test tube using yellow flame throughout.
Heat the powder mixture at the top of the test tube using an orange flame throughout.
Heat the iron filings-sulphur mixture at 3/4 quarters of the test tube using a red flame throughout.
- 6. Multiple Choice
When water at 0°C freezes to form ice at the same temperature of 0°C, then it:
Absorbs some heat
Releases some heat
Neither absorbs nor releases heat
Absorbs exactly 3.34 x 105J/kg of heat
- 7. Multiple Choice
When heat is constantly supplied by a burner to boiling water, then the temperature of water during vaporisation :
Rises very slowly
Rises rapidly until steam is produced
First rises and then becomes constant
Does not rise at all
- 8. Multiple Choice
Which one of the following set of phenomena would increase on raising the temperature?
Diffusion, evaporation, compression of gases
Evaporation, compression of gases, solubility
Evaporation, diffusion, expansion of gases
Evaporation, solubility, diffusion, compression of gases
- 9. Multiple Choice
On converting 308 K, 329 K and 391 K to Celsius scale, the correct sequence of temperatures will be:
33°C, 56°C and 118°C
35°C, 56°C and 119°C
35°C, 56°C and 118°C
56°, 119°C and 35° C
- 10. Multiple Choice
Four students took separately the mixture of sand, common salt and ammonium chloride in beakers, added water, stirred the mixture well and then filtered. They reported their observations as shown above:
Who reported the observations in the correct order of the components as residue and in the filtrate?
I
IV
III
II
- 11. Multiple Choice
Which of the following phenomena always results in the cooling effect?
Condensation
Evaporation
Sublimation
None of these
- 12. Multiple Choice
Which of the following cannot be considered a form of matter?
Atom
Water
Humidity
Electron
- 13. Multiple Choice
Which of the following causes the temperature of a substance to remain constant while it is undergoing a change in its state?
Latent heat
Lattice energy
Loss of heat
None of these
- 14. Multiple Choice
Which of the following statement is correct?
Materials existing as liquids at room temperature have their melting and boiling points lower than that of room temperature.
The phenomenon involving the transition of a substance from solid to liquid state is called sublimation.
To convert a temperature on the Celsius scale to Kelvin scale, subtract 273 from the given temperature
The density of ice is less than that of water.
- 15. Multiple Choice
Which of the following statement is not true regarding the characteristic of matter?
Particles of a matter are randomly moving in all directions.
Kinetic energy of the particles increases with a rise in temperature
Kinetic energy of the particles of all maters remains the same at a particular temperature.
Particles of matter diffuse into each other on their own.
- 16. Multiple Choice
What is Dry Ice?
Ice having no water of crystallisation
Ice that has been dried
Solid carbon dioxide
None of these
- 17. Multiple Choice
Which one is a surface phenomenon?
Evaporation
Boiling
Both (a) and (b)
None of these
- 18. Multiple Choice
Rate of diffusion depends upon:
Temperature
Surface area
Both temperature and surface area
None of these
- 19. Multiple Choice
Which of the following processes is known as fusion?
Change of liquid to solid
Change of solid to liquid
Change of liquid to vapour
Change of gaseous state to solid state
- 20. Multiple Choice
The process involving the change of state from solid to gas is called
melting
boiling
fusion
sublimation
- 21. Multiple Choice
The quantity of matter present in an object is called its:
Weight
Gram
Mass
Density
- 22. Multiple Choice
At higher altitudes:
Boiling point of a liquid decreases
Boiling point of a liquid increases
No change in boiling point
Melting point of solid increases
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