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1
When a new substance is formed after the change, it is called __________________change.
Physical
Chemical
Both (a) and (b) are correct.
None of these.
2
Which of the following are true when milk changes into curd? Choose the correct option.
1 and 2
2 and 3
1, 3 and 4
All of These
3
Which of the following equation is correct?
Evaporation is a chemical change
Digestion of food is a chemical change
Buring of paper is a physical change
All of the above
4
Which of the following shows both physical and chemical change ?
Rusting of Iron
Burning of paper
Cooking of food
All of these.
5
Why rusting of iron is a chemical change?
Beause it changes its colour
Because it makes iron powdery
Because a new substance is formed
None of these
6
What are the characteristics of physical change ?
No new substance is formed.
The change is reversible.
The change is temporary.
7
When a new substance is formed after the change, it is called _______________ .
Physical change
Chemical change
Reversible change
None of these ,
8
9
Which one of the following is a chemical change ?
Twinkling of stars
Cooking of vegetables
Cutting of fruits
Boiling of water
10
A change is a chemical change when it is accompanied by:
Energy change
Formation of new properties
Change in chemical properties
All of the above .
11
When Magnesium is burnt, heat and light are produced .The burning of Magnesium is a :
Chemical and exothermic change
Chemical and endothermic change
12
Match column - I with column - II and select the correct answer using the codes given below the columns.
A (P); B (q); C (r); D (s)
A (q); B (p); C (r); D (s)
A (r); B (s); C (p); D (q)
A (r); B (s); C (q); D (p)
13
When vinegar and baking soda is reacted , then formation of ____________________, water and other substances take place.
Oxygen
Carbon dioxide
Sulphur dioxide
Nitrogen dioxide
14
Two drops of dilute sulphuric acid were added to 1g of copper sulphate powder
Step I: A small amount of hot water is added to dissolve it.
Step II: On cooling blue crystals get seprated
Step I & Step II are?
Physical & Chemical Change
Chemical & Physical Change
Both Physical
Both Chemical
15
Complete the following analogy: Electrolysing : Chemical change : : Crystallisation : ____________
Thermal change
Neutralisation Reaction
Fast change