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What is meant by specific heat capacity? - Science and Technology 1

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प्रश्न

What is meant by specific heat capacity? 

लघु उत्तर
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उत्तर

Specific heat capacity of a body can be defined as the amount of heat energy required to raise the temperature of the unit mass of that body by 1°C (or 1 K). 

It is given as:

s  = `(Delta Q)/(DeltaT xx m)`

where,

ΔQ = Amount of heat energy supplied

ΔT = Rise in temperature

m = Mass of the body

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पाठ 5: Heat - Exercises [पृष्ठ ७१]

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संबंधित प्रश्‍न

Write the approximate value of specific heat capacity of water in S.I. unit.


A mass m1 of a substance of specific heat capacity c1 at temperature t1 is mixed with a mass m2 of other substance of specific heat capacity c2 at a lower temperature t2. Deduce the expression for the temperature t of the mixture. State the assumption made, if any.


Explain the term boiling ?


Name three fossil fuels that emit carbon dioxide into the atmosphere ?


Without green house effect, the average temperature of earth’s surface would have been:

(a) – 18℃

(b) 33℃

(c) 0℃

(d) 15℃


(i) State whether the specific heat capacity of a substance remains the same when its state changes from  solid to liquid. 
(ii) Give one example to support your answer.


Write the SI unit of specific heat.

 A burner raises the temperature of 360 g of water from 40°C to 100°C in 5 minutes. Calculate the rate of heat supplied by the burner.


State, with reason, which of the two, boiling water or steam both at 100°C will produce more severe burns.


Why do bottled soft drinks get cooled, more quickly, by the ice cubes than by the iced water?

A liquid X has specific heat capacity higher than the liquid Y. Which liquid is useful as heat reservoir to keep juice bottles without freezing?


m kg of a substance of specific heat capacity s J/kg °C is heated so that its temperature rises from θ1°C to θ2°C. Write down the expression for the heat Q supplied.


Explain, why do sandy soils, get heated up quickly as compared to wet soils?


The temperature of a lead piece of mass 400 g rises from 20°C to 50°C when 1560 J of heat is supplied to it. Calculate: Heat capacity of lead piece.


Write the name.

The amount of heat absorbed at constant temperature by unit mass of a liquid to convert into gaseous phase.


The specific heat capacity of water is 1 cal/g °C.


_______ is defined as the amount of heat required to raise the temperature of 1kg of a substance by 1°C.


Consider the statement given below and choose the correct option.

Assertion: Radiation is a form of heat transfer which takes place only in vacuum.

Reason: The thermal energy is transferred from one part of a substance to another part without the actual movement of the atoms or molecules.


The diagram below shows a cooling curve for 200 g of water. The heat is extracted at the rate of 100 Js-1. Answer the questions that follow:

  1. Calculate specific heat capacity of water.
  2. Heat released in the region BC.

J/Kg °C is the unit of specific heat capacity.


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