Question Text
Question 1 :
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 2 :
The gas we use in the kitchen is called liquefied petroleum gas (LPG). In the cylinder it exists as a liquid. When it comes out from the cylinder it becomes a gas (Change-A) then it burns (Change-B). The following statements pertain to these changes. Choose the correct one.
Question 5 :
Which of the following is true when milk changes into curd?
Question 6 :
State true or false: Burning of wood is the chemical change.
Question 9 :
Ships suffer a lot of damage though they are painted. Is this statement true or false?
Question 10 :
Which of the following is true when milk changes into curd?
Question 11 :
During galvanisation, iron is coated with _____ to prevent it from rusting.
Question 12 :
Which type of change is beating of aluminium metal to make aluminium foil?
Question 14 :
Grinding of wheat grain changes its size. It is a _____ change.
Question 15 :
When carbon dioxide is passed through lime water, it turns milky due to the formation of which substance?
Question 16 :
Which of the following statements is incorrect for a chemical reaction?
Question 18 :
State true or false: Iron and rust are the same substances.
Question 19 :
State true or false: Formation of manure from leaves is a physical change.
Question 20 :
Anaerobic bacteria digest animal waste and produce biogas. Is the statement true or false?
