Question Text
Question 1 :
If you leave a piece of iron in the open for a few days, it acquires a film of brownish substance, called rust . Is rust different from iron?
Question 3 :
Which one is an example of a chemical reaction where sound is produced ?
Question 4 :
State true or false: Iron and rust are the same substances.
Question 5 :
Which of the following statements is incorrect for a chemical reaction?
Question 7 :
Can you reverse back the process of rusting by some simple method?
Question 9 :
Which of the following is true when milk changes into curd?
Question 11 :
Read the following statement and give the appropriate term:Accumulation of wastes in the soil generated by human activity which alter the features of soil.
Question 15 :
State True or False: The rotting dead matter in the soil is called humus.
Question 16 :
State true or false: Clayey soil is light in weight while sandy soil is heavy in weight.
Question 18 :
The removal of land surface by water, wind or ice is known as __________.
Question 20 :
State true or false:
Middle layer is rich in minerals and iron oxide.
