CBSE Class 9 Science Sample Paper Set 10

SECTION-A

1. Define atomic mass of an element. Mention the unit of measuring the atomic mass of an element. 1

2. What is the number of electrons in Mg atom and Mg²⁺ ion ? 1

3. Who proposed the five kingdom classification of living organisms?1

4. Deifine transverse waves and name the points where pressure or density variation are maximum and minimum respectively during its propagation. 2

5. An object of mass m and velocity v has kinetic energy = 200 J. Find the new kinetic energy if the velocity of the object becomes double. 2

6. State three rules for writing the chemical formulae. 3

7. Write the symbols for the atoms with the given atomic numbers [Z] and mass number [A].

(i) Z=17, A=35

(ii) Z=4, A=9

(iii) Z=11, A=23

8. (a) Define one mole. How is it related to Avogadro’s constant ?

(b) Find the number of sodium ions in sodium sulphate.

[Atomic mass of Na=23 u, S=32 u, O=16 u]

9. Mention three characteristics of phylum chordata.

10. Answer the following questions in brief with reason :

(a) Do acute and chronic diseases have different effect on our health ?

(b) Why any disease that causes poor functioning of some parts of the body will affect our general health as well ?

(c) Which disease causes more effects on general health - acute or chronic ?

11. Name the organs of the body where the following microbes attack :

(a) HIV virus

(b) Malaria causing microbes

(c) Virus causing Japanese encephalities

12. (a) Relative density of gold is 19.5. The density of water is 1000 kg/m^-3. Find the density of gold in Sl unit and in g/cc.

(b) The radius of solid gold sphere is 0.25 cm. If density of gold is 19.5 g/cc. Calculate its mass.

13. Explain the term echo. State two conditions for an echo to be heard.

14 (a) Illustrate the law of conservation of energy by discussing the energy changes which occur when we draw a pendulum bob to one side and allow it to oscillate.

Please click the link below to download CBSE Class 9 Science Sample Paper Set 10