Willer Academy
Class 9 Science Quiz

Name: Willer Code:

1. Which state of matter has the strongest intermolecular forces?

A. Solid B. Liquid C. Gas D. Plasma

2. A mixture of salt dissolved in water is a:

A. Colloid B. Suspension C. Solution D. Compound

3. The power house of the cell is:

A. Nucleus B. Mitochondria C. Chloroplast D. Ribosome

4. Diffusion is fastest in:

A. Solids B. Liquids C. Gases D. Plasma

5. Tyndall effect is observed in:

A. Solutions B. Suspensions C. Colloids D. Compounds

6. Why does a desert cooler cool better on hot, dry days than hot, humid days?

7. State Newton's first law. Why is it called the law of inertia?

8. A car of mass 1000 kg accelerates at 2 m/s² under a force. Friction opposes with 200 N. What is the engine force?

9. A stone weighs 44 N in air and 32 N in water. Calculate its relative density.

10. A 0.5 kg ball strikes a wall at 12 m/s and rebounds at 8 m/s. Calculate impulse.