Worksheetschemistry class 9 matter surrounding us
Total questions: 25
Worksheet time: 17mins
CO2 can be easily liquified and even solidified because
It has weak forces of attraction
It has comparatively more force of attraction than other gases
It has more intermolecular space
It is present in atmosphere.
Which of the following has heighest kinetic energy?
Particles of ice at 0 °C
Particles of water at 0 °C
Particles of water at 100 °C
Particles of steam at 100 °C
Bose-Einstein Condensate have
Very low kinetic energy
Low kinetic energy
High kinetic energy
Highest kinetic energy.
Which of the following is most suitable for summer?
cotton
nylon
polyester
silk
Which of the following is incorrect about plasma?
Fluorescent tube and neon sign bulbs consist of plasma.
The gas gets ionised when electrical energy flows through it.
It consists of super-energetic and super-excited particles.
The plasma glows with colour which does not depend upon nature of gas.
The colour of vapours formed on sublimation of iodine solid is
Purple (violet)
Colourless
yellow
orange
Under which of the following conditions we can boil water at room temperature?
At low pressure
At high pressure
At very high pressure
At atmospheric pressure
Which of the following is not endothermic process?
Fusion
Vapourisation
Temperature
Insoluble heavy impurities
Which of the following does not affect rate of evaporation?
Wind speed
Surface Area
Temperature
Insoluble heavy impurities
Kinetic energy of molecules is directly proportional to
Temperature
Pressure
Both (a) and (b)
Atmospheric pressure
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)
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
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
Which one of the following statements is not true?
The molecules in a solid vibrate about a fixed position
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
The molecules in a liquid are arranged in a regular pattern
The correct procedure of heating iron-sulphur mixture to prepare iron sulphide is:
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 powder mixture at the base of the test tube using a blue flame throughout.
Heat the iron filings-sulphur mixture at 3/4 quarters of the test tube using a red flame throughout.
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
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
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
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.
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.
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
Which of the following cannot be considered a form of matter?
Atom
Water
Humidity
Electron
Which of the following phenomena always results in the cooling effect?
Condensation
Evaporation
Sublimation
None of these
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
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 below
Student ------As residue ---------In the filtrate
A -----Ammonium chloride --------Common salt, Sand
B ----Common salt, Sand--------- Ammonium chloride
C ---Sand, Ammonium chloride-------- Common salt
D ---sand------- Ammonium chloride,Common salt
Who reported the observations in the correct order of the components as residue and in the filtrate?
A
B
C
D
