What is specific heat capacity?

The specific heat capacity of any substance is the amount of heat required to raise the temperature of one unit substance by one degree celsius. The substances with higher specific heat capacity take longer to heat up and to cool down. S.I. unit of specific heat is J kg - 1 ° C - 1 . S = Q m ∆ t (Where, S is the specific heat, Q is the heat, m is the mass, and ∆ t is the change in temperature)

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Is it possible to raise the temperature of water by heating it in a container made-up of paper? [Temperature required to burn the paper is more than $100 ° C$ ]

Important Questions on Heat

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7th CBSE

IMPORTANT

Pearson IIT Foundation Physics>Chapter 3 - Heat>PRACTICE QUESTIONS (COMPETITION WING)>Q 75

Rings made-up of copper and iron are fixed as shown in the figure. On heating the rings, explain what happens to them, if the thickness of the rings are negligible.

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7th CBSE

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Pearson IIT Foundation Physics>Chapter 3 - Heat>PRACTICE QUESTIONS (COMPETITION WING)>Q 76

20 g

of water at

50 ° C

is mixed with

10 g

of water at

15 ° C

, then find the equilibrium temperature of the mixture.

MEDIUM

7th CBSE

IMPORTANT

Pearson IIT Foundation Physics>Chapter 3 - Heat>PRACTICE QUESTIONS (COMPETITION WING)>Q 77

Explain why a clinical thermometer is exclusively used to measure the human body temperature and a laboratory thermometer is used to measure the temperatures of different substances but not to measure the human body temperature.

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Pearson IIT Foundation Physics>Chapter 3 - Heat>PRACTICE QUESTIONS (COMPETITION WING)>Q 78

Two beakers A and B contain water at different temperatures. When

1 litre

of water from beaker A is mixed with

2 litre

of water from beaker B, the equilibrium temperature is

16 ° C

and when

2 litre

of water from beaker A is mixed with

2 litre

of water from beaker B, then the equilibrium temperature is

14 ° C

. Determine the temperature of water in the beakers A and B.

HARD

7th CBSE

IMPORTANT

Pearson IIT Foundation Physics>Chapter 3 - Heat>PRACTICE QUESTIONS (COMPETITION WING)>Q 79

Two beakers contain hot water of the same temperature. One beaker is placed in another beaker containing cold water and the other beaker in front of a rotating fan. It is observed that the beaker placed in front the fan cools faster. Explain the reason.

HARD

7th CBSE

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Pearson IIT Foundation Physics>Chapter 3 - Heat>PRACTICE QUESTIONS (COMPETITION WING)>Q 80

When the same amount of heat is supplied to the different materials, will they increase their temperature by the equal amount? Why?

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7th CBSE

IMPORTANT

Pearson IIT Foundation Physics>Chapter 3 - Heat>PRACTICE QUESTIONS (COMPETITION WING)>Q 81

A test tube is filled with some water. A small piece of wax is fixed at the bottom of the test tube and a small piece of wax is made to float on the water. What happens to the wax at the top and bottom of the test tube if the test tube is heated at the top, middle and bottom?

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7th CBSE

IMPORTANT

Pearson IIT Foundation Physics>Chapter 3 - Heat>PRACTICE QUESTIONS (COMPETITION WING)>Q 82

Why is hot water more effective than cold water in extinguishing fire?

Is it possible to raise the temperature of water by heating it in a container made-up of paper? [Temperature required to burn the paper is more than 100°C]

Important Questions on Heat

Learn and Prepare for any exam you want !

Is it possible to raise the temperature of water by heating it in a container made-up of paper? [Temperature required to burn the paper is more than $100 ° C$ ]