16 solutions available
How does heat get transferred in these materials? (cooking utensils made of metals) (Page 90)
Identify whether the given materials are good or poor conductors of heat. (Page 91)
Why is the smoke going up? (Page 92)
How does heat transfer take place in liquids? Do liquids also rise up when heated, like air? (Page 93)
I wonder how heat from the fire reaches us? (Page 96)
How does water seep through the surface of the Earth? (Page 99)
Choose the correct option in each case. (i) Your father bought a saucepan made of two different materials, A and B, as shown in Fig. 7.14. The...
A shopkeeper serves you cold lassi in a tumbler. By chance, the tumbler had a small leak. You were given another tumbler by the shopkeeper to put the...
State with reason(s) whether the following statements are True [T] or False [F], (i) Heat transfer takes place in solids through convection.
Some ice cubes placed in a dish melt into water after sometime. Where do the ice cubes get heat for this transformation?
A burning incense stick is fixed, pointing downwards. In which direction would the smoke from the incense stick move? Show the movement of smoke with...
Two test tubes with water are heated by a candle flame as shown in Fig. 7.16. Which thermometers (Fig. 7.16 a or Fig. 7.16 b) will record a higher...
Why are hollow bricks used to construct the outer walls of houses in hot regions?
Explain how large water bodies prevent extreme temperature in areas around them.
Explain how water seeps through the surface of the Earth and gets stored as groundwater.
The water cycle helps in the redistribution and replenishment of water on the Earth. Justify the statement.
