Question 3 :
A cold steel spoon is dipped in a cup of hot milk. Heat is transferred to its other end by the process of ______________.
Question 6 :
You may have noticed that a few sharp jerks are given to clinical thermometer before using it. Why is it done?
Question 7 :
The thermometer that measures our body temperature is called a ________________.
Question 8 :
To keep her soup warm Paheli wrapped the container in which it was kept with a woolen cloth. Why can she apply the same method to keep a glass of cold drink cool?
Question 9 :
When water is heated, the water near the flame gets hot. Hot water rises up. The cold water from the sides moves down towards the source of heat. This water also gets hot and rises and water from the sides moves down. This process continues till the whole water gets heated. This mode of heat transfer is known as ___________.
Question 11 :
The mode of heat transfer in which molecules of a fluid actually move after taking heat is called:
Question 14 :
The materials which do not allow heat to pass through them easily are __________________ of heat.
Question 15 :
One litre of water at $30^{\circ}C$ is mixed with one litre of water at $50^{\circ}C$. The temperature of the mixture will be-
Question 16 :
Fill in the blank: The hotness of an object is determined by its _________ .
Question 17 :
Stainless steel pans are usually provided with copper bottoms. The reason for this could be:
Question 18 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1cb7af59b460d7261ec43.png' />
In the image above, at $B$ the heat is being transferred by:
Question 19 :
Fill in the blanks : Temperature of boiling water cannot be measured by a _______ thermometer.
Question 20 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1cb6bf59b460d7261ec33.PNG' />
Boojho has three thermometeras shown in figure above. He wants to measure the temperature of his body and that of boiling water which thermometers should he choose ?
Question 21 :
Process of heat transfer which does not require any medium is:
Question 23 :
In places of hot climate it is advised that the outer walls of houses be painted white.Why?
Question 25 :
Which of these is a practical application of insulators of heat.
Question 26 :
A marble tile would feel cold as compared to a wooden tile, on a winter morning, because the marble tile is:
Question 28 :
Fill in the blank: No medium is required for transfer of heat by the process of __________ .
Question 30 :
Choose the correct option for : Dark coloured clothes are preferred during
Question 32 :
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?
Question 33 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1cc13f59b460d7261ed01.jpeg' />
Look at figure given above. Mark where the heat is being transferred by radiation.
Question 34 :
The materials which allow heat to pass through them easily are __________________ of heat.
Question 35 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1cb79f59b460d7261ec42.png' />
In the image above, at $A$ the heat is being transferred by:
Question 36 :
Can you then use laboratory thermometer to measure your body temprature?
Question 39 :
Why are handles of most utensils made up of plastic and wood?
Question 40 :
A wooden spoon is used to prepare vegetables. Its other end:
Question 41 :
No medium is required for transfer of heat by the process of ________.
Question 42 :
The materials which do not allow heat to pass through them easily are called :
Question 43 :
Fill in the blank: Temperature of boiling water cannot be measured by a __________ thermometer.
Question 44 :
Fill in the blank: The three modes of heat transfer are radiation, _________ and conduction.
Question 45 :
Stainless steel pans are usually provided with copper bottoms. The reason for this could be that-
Question 47 :
Why do we wear light coloured clothes when it is hot?
Question 48 :
Fill in the blank: No medium is required for transfer of heat by the process of __________ .
Question 49 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1cb77f59b460d7261ec3f.PNG' />
Observe the above figure : Water is being boiled in a pan of wide base. Fill up the box $P$ to indicate the mode of flow of heat to the hand.
