CBSE VII | SCIENCE Sample Paper – 1 www.topperlearning.com 1

Class IX Science

Sample Paper – 2 Time: 3 hrs Total Marks: 80

SECTION A Attempt all questions from this Section 1. The speed of sound in solids is: [2]

(a) Lesser than its speed in liquids and gases (b) Greater than its speed in liquid and lesser than its speed in gases (c) Greater than its speed in gases and liquids (d) Lesser than its speed in gases but greater than its speed in liquids

2. With the increase in amplitude, loudness if sound is ____________. [2] (a) Loudness (b) Velocity (c) Timbre (d) Pitch

3. If the speed of an object is doubles, its kinetic energy gets [2] (a) Doubles (b) Halved (c) Tripled (d) Quadrupled 2

4. Power is the measure of [2] (a) Rate of change of momentum (b) Force which produces motion (c) Change of energy (d) Rate of change of energy

5. Electronic configuration of an element is 2,8,5. The valency of the element is: [2] (a) 8 (b) 5 (c) 3 (d) 1

6. Metals and non-metals combine to form __________ bond. [2] (a) metallic (b) covalent (c) ionic (d) hydrogen

7. 10 g of zinc reacts with 5 g of hydrochloric acid to form 7 g of zinc chloride and 8 g of hydrogen. The above reaction satisfies which of the following laws? [2]

(a) Law of conservation of energy

(b) Law of conservation of mass (c) Law of constant proportion (d) Law of chemical reaction

8. Who is considered as the father of evolutionary biology? [2] (a) Carl Linnaeus (b) Charles Darwin (c) Carl Darwin (d) Robert Hooke

9. A scientific name contains information about its: [2] (a) Family and Species (b) Order and Family (c) Genus and Species (d) Genus and Family

10. The outer layer of our skin is made up of [2] (a) Cellulose (b) Keratin (c) Glycogen (d) All of theseww.topperlearning.com 3

SECTION B 11. If an electric iron of 1200W is used for 30 minutes daily, find the electric energy consumed in the month of April. [2] 12. Write a note on the Doppler Effect. [2] 13. Calculate the number of particles in each of the following. [2]

(a) 48g of Na atoms (b) 18g O2 molecules

14. Explain the basic structure of an atom with respect to its sub-atomic particles. [2] 15. Give an example of the following. [2]

(a) Diseases caused by viruses. (b) Diseases caused by bacteria.

SECTION C 16. What do you mean by echolocation? How is it useful? [4]– 1 17. A ball is dropped from a height of 5m. Find the velocity of the ball just before it reaches the ground. Do you require the value of mass of the body to find the velocity? Why/Why not? [4] 18. What do you mean by disease symptoms? Explain it by giving two examples. [4] 19. Explain the postulates of Rutherford’s atomic model. [4] 20. Write three differences between cations and anions.[4] www.topperlearning.com 5

SECTION D

21. State five postulates of the Dalton’s Atomic Theory. [6] 22. Explain the classification of kingdom Animalia with the help of a flow chart. [6]

23. A pendulum has a frequency of 5 vibrations per second. An observer starts the pendulum and fires a gun simultaneously. He hears the echo from the cliff after 8 vibrations of the pendulum. If the velocity of sound in air is 340 m/s, what is the distance between the cliff and the observer?[6] 24. Give the examples of five communicable diseases. What are the common preventive measures against communicable diseases? [6] 25. State the mechanical energy changes that take place in the following cases: [6]

(a) When a car moves up a hilly road (b) When a stone projected vertically upwards returns to the original position.

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