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Heat

How one can d...

Question

How one can differentiate between a heat and temperature?

A

Heat is a measure of hotness.

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B

Temperature is a energy of a substance.

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C

Heat and temperature are independent of each other.

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D

Heat is a energy while temperature is a mesurement of this energy.

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Solution

The correct option is D
Heat is a energy while temperature is a mesurement of this energy.

Heat is a energy which arises due to molecules motion. While temperature is a measure of hotness of coldness of a body.

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Q. Read the following paragraph and answer the questions.
If heat is exchanged between a hot and cold object, the temperature of the cold object goes on increasing due to gain of energy and the temperature of the hot object goes on decreasing due to loss of energy.
The change in temperature continues till the temperatures of both the objects attain the same value. In this process, the cold object gains heat energy and the hot object loses heat energy. If the system of both the objects is isolated from the environment by keeping it inside a heat resistant box (meaning that the energy exchange takes place between the two objects only), then no energy can flow from inside the box or come into the box.
i. Heat is transferred from where to where?
ii. Which principle do we learn about from this process?
iii. How will you state the principle briefly?
iv. Which property of the substance is measured using this principle?

Statement (A):The constant temperature at which a solid change into liquid state by absorbing heat energy is called melting point.

Statement (B): The constant temperature at which a liquid changes into gaseous state by absorbing heat energy is called point.

Statement (C): The melting and boiling points of a pure substance is always a constant and is a good measure of finding the purity of the substance.

Q. More is the specific heat capacity of a substance, ......... is the temperature for a given amount of heat energy

Q. A. Whom should I Pair with?

Group A	Group B
a. Temperature of a healthy human body	296 K
b. Boiling point of water	98.6^∘F
c. Room temperature	0^∘C
d. Freezing point of water	212^∘F

B. Who is telling the truth?
a. The temperature of a substance is measured in joules.
b.Heat flows from an object at higher temperature to an object at lower temperature.
c. Joule is the unit of heat.
d. Objects contract on heating.
e. Atoms of a solid are free.
f. The average kinetic energy of atoms in a hot objects is less than the average kinetic energy of atoms in a cold objects.

C. You will find if you search.
a. A thermometer is used to measure............... .
b. The apparatus used to measure heat is called a..................... .
c. Temperature is the measures of the............................ Kinetic energy of the atoms in a substance.
d. The heat contained in a substannce is the measures of the....................... kinetic energy of atoms in the substance.

Q. Consider the following statements.

1.

A heat engine is a device which converts heat energy into mechanical energy.

2.

A heat engine essentially consists of source of heat at higher temperature, working substance and sink of heat at lower temperature.

3.

In a diesel engine, a mixture of fuel vapours and air acts as the working substance.

4.

Efficiency of a petrol engine is greater than diesel engine.
Which of the statements given above are correct?

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