Question 2 :
If soil contains greater proportion of big particles it is called __________.
Question 3 :
Dung of _________ is mixed in the soil used to make surahi.
Question 6 :
There are following types of soil on the basis of size of particles:
Question 8 :
B-horizon or Middle Layer is generally __________ than topsoil or A-horizon.
Question 9 :
Arrange the following in descending order on the basis of the size : Clay, Gravel, Fine sand, stone, coarse sand and Silt.
Question 10 :
Soil has particles of different sizes. Arrange the words given below in increasing order of their particle size. Rock, Clay, Sand, Gravel, Silt
Question 12 :
Can you reverse back the process of rusting by some simple method?
Question 13 :
State true or false: Iron pipes coated with zinc do not get rusted easily.
Question 15 :
State true or false: Cutting a log of wood into pieces is a chemical change.
Question 16 :
When baking soda is mixed with lemon juice, bubbles are formed with the evolution of a gas. What type of change is it?
Question 17 :
Which of the following is a correct example of a chemical change .
Question 18 :
State true or false: When a candle burns, both physical and chemical changes take place.
Question 19 :
State true or false: Since coastal areas have moist air and deserts have dry air in the atmosphere, therefore rusting is faster in coastal areas.
Question 20 :
State true or false: Condensation of steam is not a chemical change.
Question 22 :
Can you reverse back the process of rusting by some simple method?
Question 25 :
A student took a solution of copper sulphate in a beaker and put a clean iron nail into it and left it for about an hour. Which type of changes will he observe, physical or chemical?