Heat Transfers from Hot Body to Cold Body

Q.

Give two examples each of conductors and insulators of heat.

Q.

When Ice Cubes are kept inside a thermocol box

It does not melt fast. Why??

Q. A marble tile would feel cold as compared to a wooden tile on a winter morning, because the marble tile

1. Is a better conductor of heat than the wooden tile
2. Reflects more heat than wooden tile.
3. Is a poor conductor of heat than the wooden tile.
4. Is polished while wooden tile is not polished.

Q. Cooking pots are provided with wooden or plastic handles. Why?

Q.

Give two examples each of conductors and insulator of heat.

Q.

If we add a lump of ice to a tumbler containing water:

1. heat flows from ice to water.

2. heat flows from water to ice if water is more in tumbler.

3. heat flows from ice to water if ice is more in tumbler.

4. heat flows from water to ice.

Q. If you are given two identical spoons, one made of metal and another made of wood. If you dip both the spoons in a container of boiling water, which of them will feel hotter when you touch them?

1. 
   

   Wood, because it is a conductor of heat.

2. 
   

   Wood, because wood is an insulator of heat.

3. Metal, because it is a good conductor of heat.

   
   
4. 
   

   Metal, because it is an insulator of heat.

Q. In which of the following cases, the heat will flow from body X to body Y?

1. When heat content of body X is greater than that of body Y
2. When temperature of body X is greater than that of body Y
3. When both heat content and temperature of body X is greater.
4. When both heat content and temperature of body Y is greater.

Q.

To keep her soup warm Paheli wrapped the container in which it was kept with a woolen cloth. Can she apply the same method to keep a glass of cold drink cool? Give a reason for your answer

Q. When two bodies A and B are brought together, heat does not flow between them. When another body C is brought into contact with B, heat starts flowing from C to B. After the heat flow stops, C is now brought into contact with A then

1. heat flows from C to A
2. heat flows from A to C
3. no heat flows between A and C

Q. Heat flows from a hotter body to a body, if brought into contact.

1. colder
2. less denser
3. hotter

Q.

Heat flows from one body to another body till the bodies reach a state of______.

Q.

State one use of good conductor of heat and bad conductor of heat

Q.

Suppose a body A at a higher temperature is brought into contact with another body B at a lower temperature, which of the following(s) is/are true?

1. Temperature of A decreases

2. Temperature of A increases

3. Temperature of B decreases

4. Temperature of B increases

Q.

A system X is neither in thermal equilibrium with Y nor with Z. The systems Y and Z__.

1. May be in thermal equilibrium

2. None of these

3. Must be in thermal equilibrium

4. Cannot be in thermal equilibrium

Q.

When the matter is heated, its temperature ________.

Q. If a wooden spoon is dipped in a cup of ice-cream
Why will its other end not become cold

Q. What do you understand by thermal equilibrium?

Q. Suppose a body A at a higher temperature is brought into contact with another body B at a lower temperature. What happens to the temperature of both the bodies?

1. Temperature of B decreases

2. Temperature of B increases

3. Temperature of A increases

4. Temperature of A decreases

Q.

______is a form of energy that produces the feeling of hotness or coldness.

Q.

Cooking utensils should be made up of bad conductors of heat.

1. True
2. False

Q.

Define Insulators?

Q.

When two objects initially at different temperature are placed in contact with each other, heat flows from the body which is at a____________temperature to the body which is at a____________temperature.

Q.

Cooking utensils are made up of good conductors?

Q.

Give two examples of good conductors of heat.

Q. Why are asbestos sheets used for laying the roofs of some houses?

1. They are good conductors of heat
2. They are bad conductors of heat
3. They are costly
4. They have nice look

Q.

Question 1

A marble tile would feel cold as compared to a wooden tile on a winter morning, because the marble tile

(a) Is a better conductor of heat than the wooden tile.

(b) Is polished while wooden tile is not polished.

(c) Reflects more heat than wooden tile.

(d) Is a poor conductor of heat than the wooden tile.

Q. A body having higher energy temperature.

1. may have higher
2. must have higher
3. must have lower

Q.

Name the two good conductors of heat?

Q. A material which allows heat to pass through it easily is known as ________. [1 mark]