Properties of Matter Quiz - CBSE Class 9 Science

Free practice quiz: Properties of Matter (CBSE Class 9 Science). 20 multiple-choice questions with answers and explanations. Play online, no sign-up needed.

Sample questions

1. What is the boiling point of water under normal atmospheric pressure?

   1. 100°C
   2. 90°C
   3. 50°C
   4. 0°C
   Show answer

   Answer: A. 100°C

   Under normal atmospheric pressure, water boils at 100°C, which is a standard property of matter.

2. Why does ice float on water?

   1. Ice is colder than water
   2. Ice is denser than water
   3. Ice is less dense than water
   4. Ice is drier than water
   Show answer

   Answer: C. Ice is less dense than water

   Ice floats on water because it is less dense than liquid water. The molecular structure of ice traps air, making it light enough to float.

3. Which property of matter is observed when a metal changes color upon heating?

   1. Luster
   2. Sonority
   3. Thermal conductivity
   4. Color change
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   Answer: D. Color change

   The color change in metals upon heating is a physical property that indicates a change in energy levels.

4. Why does a balloon filled with helium rise in air?

   1. Helium is heavier than air
   2. Helium is lighter than air
   3. Helium is denser than air
   4. Helium is cooler than air
   Show answer

   Answer: B. Helium is lighter than air

   Helium is less dense and lighter than the surrounding air, causing the balloon to rise.

5. At what temperature is an object said to be in thermal equilibrium with its surroundings?

   1. Equilibrium temperature
   2. Room temperature
   3. Absolute zero
   4. Melting point
   Show answer

   Answer: A. Equilibrium temperature

   An object is in thermal equilibrium when its temperature equals the temperature of its surroundings, meaning no net heat transfer occurs.

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