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#### Half Yearly Model Question Paper 2019

9th Standard

Reg.No. :
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Science

Time : 02:30:00 Hrs
Total Marks : 75

Part I

Choose the most suitable answer from the given four alternatives and write the option code with the corresponding answer.

12 x 1 = 12
1. Choose the correct one

(a)

mm< cm < m < km

(b)

mm > cm > m > km

(c)

km < m < cm < mm

(d)

mm > m> cm> km

2. A body moving along a circular path has _______

(a)

constant speed

(b)

constant velocity

(c)

(d)

no tangential velocity

3. The velocity of light in air is______________

(a)

$1.8\times { 10 }^{ 8 }$m/s

(b)

$3\times { 10 }^{ 8 }$m/s

(c)

$2.25\times { 10 }^{ 8 }$m/s

(d)

$3\times { 10 }^{ 6 }$m/s

4. Protons and neutrons are collectively called as ________

(a)

mesons

(b)

neutrino

(c)

Nucleons

(d)

Positrons

5. From the following options select the statement which is not applicable to frog?

(a)

They are amphibians

(b)

Three chambered heart

(c)

Presence of webbed feet

(d)

Body is divided into head, thorax and abdomen.

6. 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

7. The direction of magnetic field around a straight conductor carrying current can be determined by____________

(a)

Fleming's left hand rule

(b)

Lenz's law

(c)

Right hand thumb rule

(d)

Fleming's right hand rule

8. Which of the following compound(s) possesses high melting point?

(a)

NaCI

(b)

MgCI2

(c)

CCl4

(d)

Both a & b

9. The function of phloem  fibres is__________

(a)

passage of food

(b)

store food

(c)

mechanical strength

(d)

preparation of food

10. The structural and functional unit of the kidney is__________

(a)

villi

(b)

liver

(c)

nephron

(d)

ureter

11. Pen drive is _______device.

(a)

Output

(b)

Input

(c)

Storage

(d)

connecting cable

12. Which antibiotic is extracted from fungi?

(a)

Streptomycin

(b)

Erythromycin

(c)

Bacitracin

(d)

Penicillin

13. Part II

Answer any 7 questions. Question no. 22 is compulsory.

7 x 2 = 14
14. When a ray of light passes from air into glass, is the angle of refraction greater than or less than the angle of incidence?

15. Calculate the number of electrons present in the third (M) and fourth (N) orbits

16. Define magnetic field

17. What are p-block elements?

18. Give two types of Sclerenchyma.

19. Name the components of xylem and phloem.

20. Name the tissue that connects muscle to bone in humans.

21. Name tissue that stores fat in our body.

22. Name the connective tissue with a fluid matrix.

23. Name the tissue present in the brain.

24. Part III

Answer any 7 questions. Question no. 32 is compulsory.

7 x 3 = 21
25. A car moving along a straight line covers a distance of 1 km towards the east in 100s. Find the (i) speed of the car. (ii) the velocity of the car.

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

27. Differentiate between filtrate and distillate

28. Define mass number.

29. How will you prove that shoots bent towards light? (OR) Experiment to demonstrate phototropism.

30. How is the reproductive characters of mammals different from those of Aves?

31. For what are minerals essential for our body?

32. What is data processing?

33. Name the types of teeth present in an adult human being. Mention the functions of each.

34. A force of 200N is applied on an area of 5m2. Find the pressure.

35. Part IV

3 x 7 = 21
1. A car is fitted with a convex mirror of focal length 20 cm. Another car is 6 m away from the first car.
a) Find the position of the second car as seen in the mirror of the first
b) What is the size of the image if the second car is 2 m broad and 1.6 m high?
Focal length = 20 cm (convex mirror)
Object distance = -6m
= -600 cm
Image distance v =?
Calculation for position of image using mirror equation

2. State the Gay Lussac’s law of combining volumes, explain with an illustration.

1. Explain the principle, construction and working of a AC generator

2. If you put one ice cube in a glass of water and another in a glass of alcohol, what would you observe? Explain your observations.

1. The main scale reading while measuring the thickness of a rubber ball using Vernier caliper is 7 cm and the Vernier scale coincidence is 6. Find the radius of the ball.

2. How are the home appliances connected in general, in series or parallel. Give reasons.