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 Annual Exam Science Sample Paper 

    Class IX(2019-20)

Time:3 Hours Maximum Marks 80

Section 'A'

Which of the following are physical changes?
i) Melting of iron metal
ii) Rusting of Iron
iii) Bends on Iron rod
iv) Drawing a wire of iron
( i),(ii) and (iii)              b) (i),(ii) and (iv)
c) (i),(iii) and (iv).        d) (ii),(iii) and (iv)

2. Mass of one atom of oxygen is
16g/6.023×10²³           b)32g/6.023×10²³
c)1g/6.023×10²³          d)8u

3 Fill in the blanks :
Ozone- layer is getting depleted because of ____________
The three isotope of hydrogen are _______,______ and _________

4. A particle is moving in a circular path of radius r. This displacement after half circle would be:
a)Zero         b) πr       c)2r          d)2πr

5.Write the expanded form of AIDS.

6. Which step is not involved in the carbon cycle ?
a) Photosynthesis ।  b) Transpiration
c) Respiration         d) Burning of fossil fuels

7. What is kinetic energy ?

8. How does weeds affect the crop plant ?

9. Define Potential energy ?

10. Write one biotic and abiotic factors for making soil ?
                   
                          Section'B'

11. Why does the temperature of a substance remains constant during its melting or boiling point ?

12. What are the postulates of JJ Thomson's model of an atom ?

13. Define the terms and give one example of each

• Bilateral Symmetry
• Coelom
• Triploblastic

14. On the basis of Thomson's atomic model of an atom,explain how the atom is neutral as a whole.

15. What do you mean by immediate cause of a disease ?

16. Write the classification of disease on the the basis of duration.
Find the energy consumed in 10 hours by 5 devices of power 250W each. Also define 1HP.

17. Answer the given questions:
Fertile soil has humus.Why ?
Why step farming is common in hills ?
Why are root nodules useful for the plants ?

18. Write down the electron distribution of pottasium atom.How many electrons are there in L shell?

19. Answer the questions :

• What is an antibiotic?Give two examples.
• Name any two disease transmitted through vectors.

20. Differentiate between:

• Capture fishery and culture fishery.
• Signs and symptoms
• Mixed cropping and inter cropping.

21. Which has more number of atom ?
100g of N2 or 100g of NH3

23. Explain:

• A horse continues to apply a force in order to move a cart with constant speed.Why ?
• How immune system of human body responds to infection.
• How ear help us in hearing.

24. Establish the relationship between speed of sound, it's wave length and frequency. If velocity of sound in air is 340ms-1 calculate.
Wavelength when frequency is 256Hz
Frequency when wavelength is 0.85m
25. Differentiate between Simple and permanent plant tissues.
26. Draw a well labelled diagram of parenchyma plat tissue.
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