Heat and Temperature

Q.

Convert $273$ Kelvin into Celsius.

Q.

Convert $37°$ Celsius to °Kelvin?

Q.

The SI unit of latent heat is

1. J/g K

2. J/g

3. J/kg K

4. J/kg

Q.

The main advantage of mercury thermometer over alcohol thermometer is that mercury has greater boiling point than alcohol.

1. True

2. False

Q. The measure of the degree of hotness or coldness of a body is called its ___

1. mass
2. volume
3. temperature
4. heat

Q.

The boiling point of water and the freezing point of water on Fahrenheit scale is………….and……………….respectively.

Q.

Convert 75°C into kelvin.

Q.

State the formulae for converting temperature in Celsius scale into a) Kelvin scale b) Fahrenheit scale.

Q.

Convert -30°C into kelvin.

Q. Two bodies A and B are brought into contact with one another. The heat flows from A to B then the temperature of A is the temperature of B.

1. greater than
2. equal to
3. lesser than

Q.

Difference in ________ determines the flow of heat between two bodies.

1. pressure

2. temperature

3. volume

4. heat content

Q.

Convert the following temperatures to the Celsius scale.

$573\mathrm{K}$

Q. A piece of metal at 20^oC has a mass of 60g. When it is immersed in a current of steam at 100^∘C, 0.5g of steam is condensed on it. Determine the specific heat of metal, given that the latent heat of steam = 540 cal/g.

Q.

Which of the following represents the correct diagram for anomalous expansion of water as a real life application?

1. C

2. D

3. A

4. B

Q.

In Fahrenheit scale, ___.

1. the ice point is marked 23

2. the ice point is marked at -32

3. the ice point is marked at 32

4. the ice point is marked at -23

Q. When two bodies $A$ and $B$ are in thermal equilibrium, the temperature of $A$ is temperature of $B$.

1. greater than
2. lesser than
3. equal to

Q.

State the temperature of the ice point on the Celsius scale.

Q.

Alka was making tea in a kettle. Suddenly she felt intense heat from the puff of steam gushing out of the spout of the kettle. She wondered whether the temperature of the steam was higher than that of the water boiling in the kettle. Comment.

Q. Two different bodies A and B are at thermal equilibrium. Which of the following statements are true based on the above statement?

1. The specific heat capacity of both A & B are the same.
2. The average kinetic energy of the molecules of both A & B are the same.
3. The heat energy possessed by both A & B are the same.
4. Both A & B are at the same temperature.

Q.

Assertion: Water at 100 °C causes more severe burns than steam at 100 °C.

Reason: Steam has the highest specific latent heat of vaporization.

1. Both ‘A’ and ‘R’ are correct and ‘R’ is the correct explanation of ‘A’.

2. Both ‘A’ and ‘R’ are correct, but ‘R’ is not the correct explanation of ‘A’.

3. ‘A’ is correct, but ‘R’ is incorrect

4. ‘A’ is incorrect, but ‘R’ is correct

Q.

The SI unit of temperature is________.

1. celsius

2. fahrenheit

3. kelvin

4. joule

Q. State three advantages of alcohol over mercury for using it as a thermometric liquid.

Q.

For a latent heat, which of the following is true?

1. The average kinetic energy of molecules remains constant.

2. The average kinetic energy of molecules increases.

3. The average potential energy changes

4. The average potenatial energy of molecules remains constant

Q.

Explain Temperature

Q.

Celsius scale is the SI scale for measuring temperature.

1. True
2. False

Q.

The temperature of melting ice is______________$°C$=________________$°F$.

Q. Tell 3 differences between heat and temperature.

Q. If two bodies A and B are at room temperature, then _________.

1. heat flows from A to B
2. heat flows from B to A
3. no heat flow happens
4. heat is absorbed by surroundings

Q.

The average kinetic energy of the molecules of an ideal gas is directly proportional to what?

Q.

Heat flows as a result of difference in

1. masses

2. weights

3. temperatures

4. none of these