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Physical And Chemical Changes Questions



Question 1.
Fill in the blanks :
(a) In______________________change no new substance is formed.
(b) A foul smelling spoiled food is a_______________________change.
(c) Properties such as shape, size, colour and state of a substance are called____________ properties.
(d) Turning of lime water to milky is a standard test of_________________________gas.
(e) A chemical change is also called a_________________________
(f) Photosynthesis is an example of __________________________change.
(g) Burning of any substance is a____________________________change.
(h) Conditions for rusting of iron is ____________________and____________________
(i) The chemical name of vinegar is________________________________

Question 2.
Show with the help of chemical & word equation – the chemical reaction between –
(a) Vinegar and baking soda.
(b) Carbon dioxide and lime water.
(c) Burning of magnesium ribbon.
(d) Magnesium oxide and water.
(e) Rusting of iron & Copper sulfate and iron.

Multiple Choice Questions

Question 3
Galvanisation is a process used to prevent the rusting of which of the following?
(a) Iron
(b) Zinc
(c) Aluminium
(d) Copper

Question 4
Which of the following statement is incorrect for a chemical reaction?
(a) Heat may be given out but never absorbed.
(b) Sound may be produced.
(c) A colour change may take place.
(d) A gas may be evolved

Question 5
Which of the following is a physical change?
(a) Rusting of iron
(b) Combustion of magnesium ribbon
(c) Burning of candle
(d) Melting of wax

Question 6
Which of the following is a chemical change?
(a) Twinkling of stars
(b) Cooking of vegetables
(c) Cutting of fruits
(d) Boiling of water

Short answer type

Question 7
Differentiate between physical and chemical change with 2 examples of each.

Question 8
Write down any 4 characteristics of chemical change.

Question 9
Why is it always advised not to play with fireworks?

Question 10
What is the role of the Ozone layer in our atmosphere?

Question 11
Define –
(1) galvanization
(2) Crystallization process.



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Also Read



Reference Books for class 7 Science

Given below are the links of some of the reference books for class 7 math.

  1. Science for Class 7 by Lakhmir Singh
  2. Science Foundation Course For JEE/NEET/NSO/Olympiad - Class 7
  3. CBSE All In One Science Class 7 by Arihant Experts (Author)
  4. IIT Foundation Physics, Chemistry & Maths for Class 7

You can use above books for extra knowledge and practicing different questions.



Class 7 Maths Class 7 Science





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