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Class 9 Physics Properties of matter


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Class 9Class 10First YearSecond Year
viii. Which of the following affects evaporation?(a) temperature(b) surface area of the liquid(c) wind(d) all of the above
viii. Which of the following affects evaporation?(a) temperature(b) surface area of the liquid(c) wind(d) all of the above

viii.Whichofthefollowingaffectsevaporation?(a)temperature(b)surfaceareaoftheliquid(c)wind(d)alloftheaboveviii. Which of the following affects evaporation?(a) temperature(b) surface area of the liquid(c) wind(d) all of the above

7.12 Why does the atmospheric pressure vary with height?
7.12 Why does the atmospheric pressure vary with height?

7.12Whydoestheatmosphericpressurevarywithheight?7.12 Why does the atmospheric pressure vary with height?

7.11 What makes a sucker pressed on a smooth wall sticks to it?
7.11 What makes a sucker pressed on a smooth wall sticks to it?

7.11Whatmakesasuckerpressedonasmoothwallstickstoit?7.11 What makes a sucker pressed on a smooth wall sticks to it?

9. Evaporation can occur ata) freezing pointb) melting pointc) boiling pointd) all temperatures
9. Evaporation can occur ata) freezing pointb) melting pointc) boiling pointd) all temperatures

9.Evaporationcanoccurata)freezingpointb)meltingpointc)boilingpointd)alltemperatures9. Evaporation can occur ata) freezing pointb) melting pointc) boiling pointd) all temperatures

iii. Mercury is used as thermometric material because it has(a) uniform thermal expansion(b) low freezing point(c) small heat capacity(d) all the above properties
iii. Mercury is used as thermometric material because it has(a) uniform thermal expansion(b) low freezing point(c) small heat capacity(d) all the above properties

iii.Mercuryisusedasthermometricmaterialbecauseithas(a)uniformthermalexpansion(b)lowfreezingpoint(c)smallheatcapacity(d)alltheabovepropertiesiii. Mercury is used as thermometric material because it has(a) uniform thermal expansion(b) low freezing point(c) small heat capacity(d) all the above properties

EXAMPLE 8.2Change 300 \mathrm{~K} on Kelvin scale into Celsius scale of temperature.
EXAMPLE 8.2Change  300 \mathrm{~K}  on Kelvin scale into Celsius scale of temperature.

EXAMPLE8.2Change300 KonKelvinscaleintoCelsiusscaleoftemperature.EXAMPLE 8.2Change 300 \mathrm{~K} on Kelvin scale into Celsius scale of temperature.

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