NCERT Class VII Science Solutions: Chapter 6-Physical and Chemical Changes Part 1 (For CBSE, ICSE, IAS, NET, NRA 2023)

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Question 1:

Which of the following is a physical change?

  1. Rusting of iron
  2. Combustion of magnesium ribbon
  3. Burning of candle
  4. Melting of wax

Answer: D

Physical Change

Question 2:

Which of the following is a chemical change?

  1. Twinkling of stars
  2. Cooking of vegetables
  3. Cutting of fruits
  4. Boiling of water

Answer: B

Chemical Change

Question 3:

A chemical change may involve -

  1. Change in colour only
  2. Change in temperature only
  3. Evolution of gas only
  4. Any or all of the above

Answer: D

Question 4:

Which of the following is/are true when milk changes into curd?

  1. Its state is changed from liquid to semi solid.
  2. It changes colour.
  3. It changes taste.
  4. The change cannot be reversed.

Choose the correct option from below:

  1. (i) and (ii) are correct
  2. (ii) and (iii) are correct
  3. (i) , (iii) and (iv) are correct
  4. (i) to (iv) are correct

Answer: C

Question 5:

A man painted his main gate made up of iron, to

  1. Prevent it from rusting.
  2. Protect it from sun.
  3. Make it look beautiful.
  4. Make it dust free.

Which of the above statement (s) is/arc correct?

  1. (i) and (ii)
  2. (ii) and (iii)
  3. only (ii)
  4. (i) and (iii)

Answer: D

Question 6:

Iron pillar near the Qutub Minar in Delhi is famous for the following facts. Which of these facts is responsible for its long stability?

  1. It is more than 7 metres high.
  2. It weighs about 6000 kg.
  3. It was built more than 1600 years ago.
  4. It has not rusted after such a long period.

Answer: D