Download App

Physical and Chemical Changes — Science STD 7 — Question

Gujarat BoardEnglish MediumSTD 7SciencePhysical and Chemical Changes1 Mark
MCQ
Consider The Following Sentences And Choose The Incorrect One:
  • A
    Cooking causes breakdown of complex molecules of carbohydrates, fats and proteins into smaller molecules.
  • ✓
    Rusting is a reddish$-$brown flaky substance that forms on the surface of any substances.
  • C
    Chemical change is permanent and irreversible change.
  • D
    Cooking is regarded as a decomposition reaction.
✓

Answer

Correct option: B.
Rusting is a reddish$-$brown flaky substance that forms on the surface of any substances.
Rusting is a reddish$-$brown flaky substance that forms on the surface of iron objects after the process of rusting. Rest of all the statements are correct. Hence,

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free

Explore more

More "MCQ (1 Marks)" from Physical and Chemical Changes→Physical and Chemical Changes — all question types→Science STD 7 question papers→Gujarat Board STD 7 question papers→Gujarat Board question paper generator→

Similar questions

Which of the following is known as the ‘Food factories’ of plants?
→
In which horizon of soil minerals are found?
→
A drop of a liquid sample was put on the $pH$ paper. The color of the pH paper turned blue. The liquid sample could be that of:
→
Which of the following instrument measures time with the most accuracy?
→
When harmful substances get mixed with water it becomes:
→
Which of the following raw material is available in the air for photosynthesis?
→
During thunderstorm lightning is seen first and thunder is heard later on. Why?
→
Which of the following statements is correct regarding images formed by a plane mirror?
→
A combination of two or more cells is called.
→
A leaf insect looks like leaves and a polar bear living in snowy regions has white fur on its skin. Although these animals are very different from each other, what is the one way in which they are similar?
→