Half Yearly Model Question Paper 2019

10th Standard EM

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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. When an object undergoes acceleration

(a)

its speed always increase

(b)

a force always acts an it

(c)

its velocity always increases

(d)

velocity always decreases

2. Velocity of sound in a gaseous medium is 330 m s-1. If the pressure is increased by 4 times without causing a change in the temperature, the velocity of sound in the gas is

(a)

330 m s-1

(b)

660 m s-1

(c)

165 ms-1

(d)

990 ms-1

3. _____ is a relative periodic property

(a)

(b)

(c)

electron affinity

(d)

electronegativity

4. Solubility of NaCl in 100 ml water is 36 g. If 25 g of salt is dissolved in 100 ml of water how much more salt is required for saturation _____________

(a)

12g

(b)

11g

(c)

16g

(d)

20g

5. Which among the following factors affect the rate of a reaction?

(a)

Surface area of reactants

(b)

Pressure

(c)

Temperature

(d)

all the above

6. ____________ helps in transpiration.

(a)

Stomata

(b)

Epidermis

(c)

Trichomes

(d)

Root hairs

7. The_______ on both sides join to form the genital atrium in leech.

(a)

ejaculatory ducts

(b)

epididymis

(c)

sperm Vesicle

(d)

vas efferens

8. ___________is the main circulatory medium in the human body.

(a)

Blood

(b)

Water

(c)

Lymph

(d)

Plasma

9. What is true of gametes?

(a)

They are diploid

(b)

(c)

They produce hormones

(d)

10. The miracle rice which saved millions of lives and celebrated its 50th birthday is _______.

(a)

IR 8

(b)

IR 24

(c)

Atomita 2

(d)

Ponni

11. Cancer of the epithelial cells is called

(a)

Leukemia

(b)

Sarcoma

(c)

Carcinoma

(d)

Lipoma

12. Tocreate animations, cartoons and games easilywecan use_________

(a)

Paint

(b)

(c)

LINUX

(d)

Scratch

13. Part II

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

7 x 2 = 14
14. How does an astronaut float in a space shuttle?

15. What is Lens? What are types oflenses?

16. What happens to the resistance, as the conductor is made thicker?

17. Define : Relative atomic mass.

18. Among the following pairs, pick out the smallest
(i) Mg, Ca
(ii) AI, Si
(iii) CI, Br.

19. The aquatic animals live more in cold region Why?

20. Describe the ultrastructure of a chloroplast

21. Name the endocrine glands associated with kidneys.

22. What is the name given to the segments of DNA, which are responsible for the inheritance of a particular character?

23. What is Sprite?

24. Part III

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

7 x 4 = 28
25. The ratio of masses of two planets is 2:3 and the ratio of their radii is 4:7 Find the ratio of their accelerations due to gravity.

26. Explain the construction of Simple Microscope and derive its magnification power.

27. Find the final temperature of a copper rod. Whose area of cross section changes from 10 m2 to 11 m2 due to heating. The copper rod is initially kept at 90 K. (Coefficient of superficial expansion is 0.0021 /K)

28. Water boils in an electric kettle in 15 mins. after switching on. If the length of the heating wire is decreased to $\frac{1}{3}$ of its initial value, then in how much time will the same amount of water boil with the same supply voltage?

29. Write the applications of Doppler effect.

30. State Soddy and Fajan’s displacement law.

31. Write notes on
i) saturated solution
ii) unsaturated solution

32. Write a note an selection.

33. Differentiate between Type-1 and Type-2 diabetes mellitus

34. Program for print the word “Hello” with sound

35. Part IV

3 x 7 = 21
1. How does locomotion take place in leech?

2. How is the structure of DNA organised? What is the biological significance of DNA?

1. If you keep ice at 0°C and water at 0°C in either of your hands, in which hand you will feel more chillness? Why?

2. Can a nickel spatula be used to stir copper sulphate solution? Justify your answer.

1. Plutonium - 239 specimen emits radiation of 4.3 x 103 GBq per second convert this disintegrations in terms of curie.
(IBq = 2.703 x 10-11curie)

2. In the circuit diagram given below, three resistors R1, R2 and R3 of 5 Ω, 10 Ω and 20 Ω respectively are connected as shown. Calculate:

A) Current through each resistor
B) Total current in the circuit
C) Total resistance in the circuit