IX Standard - 9th - Science - Half Yearly Examination - Second Term Final Examination - Question Paper - Samacheer Kalvi

 

                                Half yearly Examination 

Class :   IX                                                                                                Marks :  100

Sub : SCIENCE                                                                                        Time : 2.30 Hrs

I.Choose the correct answer:                                                                                   16x1=16

1. 1 metric ton is equal to

a. 100 quintals        b. 10 quintals               c. 1/10 quintals                  d. 1/100 quintals

2. The centrifugal force is

a) a real force.                 b) the force of reaction of centripetal force.    

c) a virtual force.           d) directed towards the centre of the circular path.

3. Clouds float in atmosphere because of their low

a) density              b) pressure                  c ) velocity                        d) mass

4. The unit of magnetic flux density is

a) Weber                b) weber/metre             c) weber/meter²                 d) weber . meter²

5. The speed of light is maximum in

a) vacuum              b) glass                        c) diamond                       d)water

6. Among the following ___________ is a mixture

 a) Common Salt    b) Juice                        c) Carbon dioxide           d) Pure Silver

7. The correct electronic configuration of potassium is

a) 2,8,9                     b) 2,8,1                         c) 2,8,8,1                         d) 2,8,8,3

8. Elements with stable electronic configurations have eight electrons in their valence shell. They are ___

a) halogens             b) metals                    c) noble gases                    d) non metals

9) The animal without skull is

 a) Acrania                b) Acephalia              c) Apteria                      d) Acoelomate

10. Aerenchyma is found in

a) epiphytes              b) hydrophytes           c) halophytes                 d) xerophytes

11. The tropic movement that helps the climbing vines to find a suitable support is __________.

a) Phototropism          b) Geotropism          c) Thigmotropism          d) Chemotropism

12. The bending of root of a plant in response to water is called __________.

             a) Thigmonast          b) Phototropism        c) Hydrotropism                d) Photonasty

13. To prevent the entry of food into the trachea, the opening is guarded by ____________

 a) epiglottis                b) glottis                     c) hard palate                    d) soft palate

14.  The physician who discovered that scurvy can be cured by ingestion of citrus fruits is _______________

            a) James Lind            b) Louis Pasteur            c) Charles Darwin             d) Isaac Newton

15. One of the means of indirect transmission of a disease is

 a) sneezing               b) coughing                     c) vectors                       d) droplet infection

16. which key should be pressed to run a slide show ?

 a) F1                          b) Tab                            c) F5                                  d) F2

II.Answer any 10 of the following questions :                                                          10x2=20

17. How will you measure the least count of vernier calliper ?

18.Define velocity .

19.Define electric field .

20.Why does a ray of light bend when it travels from one medium to another ?

21.Define sublimation

22.How do atoms attain Noble gas configuration?

23.Give the significance of pH of soil in agriculture.

24.What is nematocysts?

25. Differentiate phototropism from photonasty.

26. Mention two vital functions of human kidney

27. What is adulterant?

28.Define vaccines

29.Name two common mosquitoes and the disease they transmit

30.What is a slide?

III .Answer any 9 of the following                                                            9x4=36

31.Differentiate mass and weight

32.Compare speed and velocity

33.State laws of flotation

34.State the direction of incident ray which after reflection from a spherical mirror retraces its path.  Give reason for your answer

35.Draw the structure of oxygen and sulphur atoms.

36.State modern periodic law.

37.What is neutralization reaction ? Give an example .

38.Differentiate between flat worms and round worms?

39. What is complex tissue ? Name the various kinds of complex tissues

40.Expalin the structure of Nephron .

41. Explain any two methods of food preservation.

42.Give an account of classification of bacteria based on the shape ?

43.What is triple agent? Mention the disease associated with respiratory system .

44.Create a presentation on festivals of Tamil nadu .Save it with suitable name.

 

IV . Answer all questions of the following:                                                             4x7=28

45.a) i)How will you find the thickness of a hollow tea cup

         ii)Write the rules that are followed in writing the symbol of units in SI system

                                                                    (OR)

     b) Describe the construction and working of mercury barometer

46. a)Explain Tyndall effect and Brownian movement with suitable diagram

                                                                      (OR)

       b) Differentiate hydrate and anhydrous salts with example

47.a)Give an account of phylum Arthropoda .

                                                                      (OR)

    b) List out the differences between mitosis and meiosis.

48.a)Explain the role of food control agencies in India.

                                                                        (OR)

  b) Suggest the immunization schedule for a new born baby till 12 months of age .Why it is necessary to follow the schedule?