NCERT PHYSICS - HEAT - CLASS 7 QUESTIONS WITH CORRECT ANSWERS LATEST UPDATE
2025/2026
Temperature - Answers measure of hotness or coldness of an object.
Kelvin - Answers SI unit for temperature
Common units of temperature - Answers Celsius and Fahrenheit
Thermal equilibrium - Answers When two objects are at the same temperature and there is no
net flow of energy between them
Heat - Answers The flow of energy between two objects or systems due to a temperature
difference.
thermometers measure temperature _______________ - Answers By exploiting property of matter
that is temp. dependent
Temperature Scale - Answers Calibrated scale marked on a thermometer
Calibration of Thermometers - Answers Using fixed points like melting point of ice or boiling
point of water
Fixed Points on Thermometer - Answers ice point (melting point of ice) and steam point(boiling
point of water)
Temperature Scales - Answers Celsius, Fahrenheit, Kelvin
freezing point - Answers The temperature at which a liquid changes into a solid state
melting point - Answers the temperature at which a solid state changes into a liquid state
Fixed points of Fahrenheit Scale - Answers Water freezes at 32 F and boils at 212 F
Fixed points of Celsius scale - Answers Water freezes at 0 C and boils at 100 C
Fixed points of Kelvin scale - Answers Water freezes at 273 K and boils around 373 K
absolute zero - Answers Minimum possible temperature where there is no heat and motion of
particles ceases
Conversions - Answers C/5 = F-32/9 = K-273/5 (T- LFP/UFP - LFP)
Disadvantages of Measuring Temp. With Hand - Answers Cannot withstand large range of
temperatures, not precise enough
Property of matter that vary with temperature - Answers Colour of light emitted by a hot object
gives us an idea of the temp
2025/2026
Temperature - Answers measure of hotness or coldness of an object.
Kelvin - Answers SI unit for temperature
Common units of temperature - Answers Celsius and Fahrenheit
Thermal equilibrium - Answers When two objects are at the same temperature and there is no
net flow of energy between them
Heat - Answers The flow of energy between two objects or systems due to a temperature
difference.
thermometers measure temperature _______________ - Answers By exploiting property of matter
that is temp. dependent
Temperature Scale - Answers Calibrated scale marked on a thermometer
Calibration of Thermometers - Answers Using fixed points like melting point of ice or boiling
point of water
Fixed Points on Thermometer - Answers ice point (melting point of ice) and steam point(boiling
point of water)
Temperature Scales - Answers Celsius, Fahrenheit, Kelvin
freezing point - Answers The temperature at which a liquid changes into a solid state
melting point - Answers the temperature at which a solid state changes into a liquid state
Fixed points of Fahrenheit Scale - Answers Water freezes at 32 F and boils at 212 F
Fixed points of Celsius scale - Answers Water freezes at 0 C and boils at 100 C
Fixed points of Kelvin scale - Answers Water freezes at 273 K and boils around 373 K
absolute zero - Answers Minimum possible temperature where there is no heat and motion of
particles ceases
Conversions - Answers C/5 = F-32/9 = K-273/5 (T- LFP/UFP - LFP)
Disadvantages of Measuring Temp. With Hand - Answers Cannot withstand large range of
temperatures, not precise enough
Property of matter that vary with temperature - Answers Colour of light emitted by a hot object
gives us an idea of the temp
