Class 9 CBSE Science Model Question (Atoms and Molecules, Force and Laws of Motion & Why Do We Fall ill

Class 9 CBSE Science Model Question

Work And Energy

 1. State the law of conservation of energy.

2. List two essential conditions for work to be done.

 

3. When is 1 joule of work said to be done ?

4. What is the SI unit of work done and power ?

5. What is power? What is its SI unit ?

 6. Find the energy in kWh consumed in 10 hours by a machine of power 500 W.

Atoms and Molecules

1. Define law of conservation of mass.

2. What is the atomicity of Argon ?

3. The relative atomic mass of oxygen atom is 16. Explain its meaning.

4. Why is it not possible to see an atom with naked eyes ?

5. Give two drawbacks of Dalton’s atomic theory.

6. Calculate molar mass of sulphuric acid.

Why do we fall ill

Q.1.   State any two condition essential for good health.

Q.2.   State any two conditions essential for being free of disease.

Q.3.   Are the answers to the above questions necessarily the same or different? Why?