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Class 9 Science
Matter In Our Surroundings
Quiz 2
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The evaporation of a liquid can best be carried out in a:
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Beaker
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Flask
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Test tube
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China dish
Which of the following processes is known as fusion?
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Change of gaseous state to solid state
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Change of solid to liquid
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Change of liquid to vapor
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Change of liquid to solid
Density of a substance is defined as
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ratio of mass and volume
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product of mass and volume
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product of mass and temperature
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ratio of mass and temperature
Rate of diffusion depends upon:
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Surface area
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None of these
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Temperature
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Both temperature and surface area
Which is more effective in cooling?
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Water at 273 K
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Ice at 373K
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Water at 373K
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Ice at 273K
Which one will help to accelerate the process of evaporation of a liquid kept in an open china dish?
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Keeping dish in open
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Blowing air into the liquid
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Keeping the dish under a running fan
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All the above
When a gas is compressed keeping temperature constant. It results in:
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Decrease in speed of gaseous molecules
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Decrease in collision among gaseous molecules
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Increase in sped of gaseous molecules
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Increase in collision among gaseous molecules
100 K is equal to:
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-2730C
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-1730C
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1830C
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1730C
Gases can be liquefied by
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increasing pressure
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decreasing temperature
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increasing pressure and decreasing temperature
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decreasing pressure
For an ideal gas number of moles per liter in terms of its pressure P, gas constant R and temperature T is:
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P/RT
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PT/R
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PRT
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RT/P
The one, in which interparticle forces are strongest, is:
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Sodium chloride
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Ether
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Hydrogen
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Carbon dioxide
What is Dry Ice?
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Solid carbon dioxide
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None of these
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Ice having no water of crystallization
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Ice that has been dried
The melting point temperature of the solid state of a substance is 400C. The freezing point temperature of the liquid state of the same substance will be:
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400C
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350C
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450C
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Can’t predict
Which of the following expression at constant pressure represents Charle’s law?
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V/T =constant
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None of the above
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VT=constant
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PV=constant
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:
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(PB / MB) (PA / MA)1/2
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(MA / MB)) ( PB / PA)1/2
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(PA / PB) (MA / MB )1/2
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(MA / MB) (PA / PB)1/2
Rate of diffusion of a gas is:
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Inversely proportional to the square root of its density
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Directly proportional to its density
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Directly proportional to its molecular mass
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Inversely proportional to the square root of its molecular mass
Select the one that when used would be considered as best condition for liquification of a gas:
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Decreasing the pressure and increasing the temperature.
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Increasing the pressure and decreasing the temperature
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Increasing the temperature
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Decreasing the pressure
00 C temperature is equal to
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300 K
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-273 K
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0 K
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273 K
Pressure of air at sea level is:
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760 cm of Hg
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All are correct
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76 mm of Hg
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One atmosphere
Which one is a sublime substance?
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Iodine
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Table salt
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Sugar
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Potassium iodide
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