HARD
7th CBSE
IMPORTANT
Earn 100
How does a thermos flask maintain the temperature of liquids kept in it?
Important Questions on What Is Thermal Energy and Heat?
MEDIUM
7th CBSE
IMPORTANT
How do woollen clothes keep us warm?
MEDIUM
7th CBSE
IMPORTANT
How do convection currents give rise to breeze in the coastal region?
MEDIUM
7th CBSE
IMPORTANT
A liquid having a temperature of when placed on a table acquires a stable temperature of . What is the room temperature, and what season could it be?
MEDIUM
7th CBSE
IMPORTANT
Two copper pieces, one thicker than the other, is kept in a room. Both the pieces have the same amount of heat energy. If the thicker piece is long, what will be the length of the thinner piece?
HARD
7th CBSE
IMPORTANT
Water filled in three separate containers of a similar kind have the same temperature of 10°C. Each circle represents one molecule of water. Based on what you have learnt in the lesson, choose the correct statements.
HARD
7th CBSE
IMPORTANT
In which of the situations given below will heat transfer occur between the water and the metal ball?
Situation 1: When a metal ball having 30°C temperature is dropped in water at 30.8°C.
Situation 2: When a metal ball having 30°C temperature is dropped in water at 20°C.
Situation 3: When a metal ball having 30°C temperature is dropped in water at 30°C.
