Download App

Is Matter Around Us Pure? — Science STD 9 — Question

Rajasthan BoardEnglish MediumSTD 9ScienceIs Matter Around Us Pure?4 Marks
Question
Define the following:
  1. Sol
  2. Aerosol
  3. Emulsion
  4. Foam
Given one example of each.
✓

Answer

  1. Sol: Sol is a colloid in which tiny solid particles are dispersed in a liquid medium.
Examples are ink and soap solution.
  1. Aerosol: Aerosol is a colloid in which a solid or liquid is dispersed in a gas.
Examples are hairspray and fog.
  1. Emulsion: An emulsion is a colloid in which minute droplets of one liquid are dispersed in another liquid which is not miscible with it.
Examples are milk and butter.
  1. Foam: A foam is a colloid in which a gas is dispersed in a liquid medium.
Examples are soap bubbles and shaving cream.

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 "Que-Ans (Each of 4 Mark )" from Is Matter Around Us Pure?→Is Matter Around Us Pure? — all question types→Science STD 9 question papers→Rajasthan Board STD 9 question papers→Rajasthan Board question paper generator→

Similar questions

List five characteristics by which compounds can be distinguished from mixtures.
→
Draw a flow sheet diagram showing the separation of various components of a mixture containing camphor, sand and iron filings.
→
A body starting from rest travels with uniform acceleration. If it travels 100m in 5s, what is the value of acceleration?
→
A boy walks from his classroom to the bookshop along a straight corridor towards North. He covers a distance of 20m in 25 seconds to reach the bookshop. After buying a book, he travels the same distance in the same time to reach back in the classroom. Find (a) average speed, and (b) average velocity, of the boy.
→
Explain various types of irrigation systems in India. How can efficiency of applied water be increased in agriculture.
→
What are ionic and molecular compounds? Give examples.
→
Which separation techniques will you apply for the separation of the following?
  1. Sodium chloride from its solution in water.
  2. Ammonium chloride from a mixture containing sodium chloride and ammonium chloride.
  3. Small pieces of metal in the engine oil of a car.
  4. Different pigments from an extract of flower petals.
  5. Butter from curd.
  6. Oil from water.
  7. Tea leaves from tea.
  8. Iron pins from sand.
  9. Wheat grains from husk.
  10. Fine mud particles suspended in water.
→
State and explain Newton’s second law of motion.
→
Mention any two desirable agronomic characters for crop improvement. Explain how farmers get desired characters incorporated into the new varieties produced. List two conditions necessary for the new varieties to be accepted.
→
Describe the method of separating a mixture containing common salt, sand and ammonium chloride.
→