Question 1 :
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 3 :
<img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1cb71f59b460d7261ec38.PNG' /> The above figure shows a student reading a doctor's thermometer. Which of the figures indicates the correct method of reading temperature ?

Question 5 :
Stainless steel pans are usually provided with copper bottoms. The reason for this could be:

Question 6 :
One litre of water at 30°C is mixed with one litre of water at 50°C. The temperature of the mixture will be

Question 7 :
Which of the following is a poor conductor of heat ?

Question 8 :
You may have noticed that a few sharp jerks are given to clinical thermometer before using it. Why is it done?

Question 9 :
<img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1cb72f59b460d7261ec3a.PNG' /> A circular metal loop is heated at point as shown in image above. In which direction would heat flow in the loop ?

Question 10 :
The materials which allow heat to easily pass through them are :

Question 11 :
Choose the correct option for : Dark coloured clothes are preferred during

Question 12 :
Which type of heat transfer is minimized when using a thermo flask?

Question 15 :
Four arrangements to measure temperature of ice in beaker with laboratory thermometer are shown in options (a, b, c and d). Which one of them shows the correct arrangement for accurate measurement of temperature ?

Question 18 :
At a campsite there are tents of two shades-one made with black fabric and the other with white fabric. Which one will you prefer for resting during winter?

Question 19 :
Fill in the blank: The temperature of boiling water cannot be measured by a ____________ thermometer.