CBSE Class 9 Science Sample Paper Set 17

SECTION-A

1. If K L and M shells of an atom are completely filled with electrons, then what would be :

(i) The total number of electrons in the atom ?

(ii) Find its valency.

2. Name the Substance which makes the cell wall of fungi.

3. In which regions is soil erosion very difficult to revert ?

4. What causes Japanese encephalitis ? How it can be prevented ?

5. State two applications of ultrasound.

6. What do you understand by 1 Pascal and 1 Newton ?:

7.(i) Write the chemical formula of magnesium hydroxide.

(ii) Calculate the number of aluminum ions present in 0.051 g of aluminium oxide [Atomic Mass of Al527 u]

8. Give reason for the following :

(a) Ions are more stable than atoms.

(b) Noble gases show low reactivity.

(c) An atom is electrically neutral.

9. Write two points of difference between an atom and an ion. Explain by giving examples two types of ions present in the compound composed of metals and non-metals.

10. A group of children were collecting some shells from the sea beach. Few of them could locate a creature in the shells. Anamika, being in class IX identified it as snail.

(i) Name the phylum to which snail belongs.

(ii) Tabulate the following features about its.

(a) Type of symmetry

(b) Type of circulatory system

(iii) Comment on the value shown by Anamika.

11. According to a newspaper report, some areas in Delhi received grey coloured water in their taps. It was reportedly due to mixing of contents at some points due to leakage in sewer and water supply pipes. Which kind of diseases are likely to spread due to such problems and why ?

Give two specific names of disease that can thus be spread.

12.Define power. State commercial unit and SI unit of electrical energy. An electric heater of 400 W works for 2 hours. Find the electrical energy units consumed in a day ?

13. Define thrust. A pressure of 1500 Pa. acts on a surface of area 10 square cm by a block of mass ‘m’. Calculate thrust of the block on the surface.

14. (a) What is a stethoscope?

(b) Which principle of sound is made use of by a stethoscope?

(c) What is the function of eardrum?

15. State the mathematical formula that relates thrust and pressure. List the factors on which the pressure depends and explain how it depends on them ?

16. If the velocity of a wave in a medium is 1400 m/sec and its wavelength is 1.5 km. Calculate its frequency. Is the it in andiblerange? State reasons.

17. Why greenhouses are built ? Explain their function ? Is greenhouse effect related to man-made greenhouses ? Support your answer with a suitable reason.

18. Define air pollution. How does burning of fossil fuels lead to air pollution ? 

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