10th Public Official Model Question 2019

10th Standard

Reg.No. :
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Science

Time : 02:15:00 Hrs
Total Marks : 75
15 x 1 = 15
1. In a pea plant, the yellow colour of the seed dominates over the green colour. The genetic make up of the green colour of the seed can be shown as __________

(a)

GG

(b)

Gg

(c)

Yy

(d)

yy

2. The sensory organs contain ______________________.

(a)

Unipolar neuron

(b)

Bipolar neuron

(c)

Multipolar neuron

(d)

Medullated neuron

3. Thin walled non-motile spores are called_____

(a)

spirogyra

(b)

aplanospore

(c)

zoospore

(d)

akinete

4. Select important characteristic features of mammals

(a)

four-chambered heart

(b)

fore-limbs and hind limbs

(c)

milk-producing glands

(d)

post anal tail

5. The special root-like structure of plant parasites in cuscuta and viscum are called ......................

(a)

Rhizoids

(b)

Haustoria

(c)

Hyphae

(d)

Stolons

6. The particles in various forms are visible only under an ultramicroscope. A solution containing such particles is called __________.

(a)

true solution

(b)

colloidal solution

7. .......................... have equal number of neutrons.

(a)

Isobars

(b)

Isotones

(c)

Isotopes

(d)

Mass Numbers

8. An example for weak acid is ________

(a)

nitric acid

(b)

acetic acid

(c)

sulphuric acid

9. The third period contains elements. Out of these elements, How many elements are non-metals?

(a)

8

(b)

5

10. The enzyme which dissociates glucose into ethanol is________

(a)

sucrose

(b)

amailase

(c)

maltose

(d)

zymase

11. Screw Gauge is an instrument used to measure the dimensions of very small objects upto ____________.

(a)

0.1 cm

(b)

0.01 cm

(c)

0.1 mm

(d)

0.01 mm

12. Chandrayaan-l was launched by the_________in October 2008 from Srihari Kota in Andrapradesh.

(a)

ISRO

(b)

NASA

(c)

ESA

13. The potential difference required to pass a current 0.2 A in a wire of resistance 20 ohm is _________.

(a)

100V

(b)

4V

(c)

0.01V

(d)

40V

14. The positive electrode of voltaic cell is_______

(a)

copper

(b)

zinc

(c)

dilute sulphuric acid

15. The phenomenon of producing an emf in a circuit whenever the magnetic flux linked with a coil changes is________.

(a)

electromagnetic induction

(b)

inducing current

(c)

inducing voltage

(d)

change in current

16. 20 x 2 = 40
17. A change that affects the body cell is not inherited.However, a change in the gamete is inherited. The effects of radiation at Hiroshima have been affecting generations.
Analyze the above statements and give your interpretation.

18. What is Germinal Variation?

19. A health worker advises the people in a locality not to have tattoong done using common needles and to insist the barber to change the shaving razors/blades in the salon.Name the dreadful disease,the spreading of which,can be prevented by following these measures.Also mention other preventive measures that can be taken with regard to this disease.

20. Tuberculosis and Typhoid are bacterial diseases.A short rod-shaped bacterium with numerous flagella-salmonella typhi causes Tuberculosis, Is this statement is correct if not, correct it.

21. Whatis the function of endocrine system in man?

22. Give any two examples for each of the following cases where dispersal of fruits and seeds take place :
(i) by birds (through excreta) (ii) by human beings

23. In balsam plant the seeds fall off far away from the mother plant.
a) Is this statement correct or incorrect?
b) Give reason.

24. Mention the two unique characteristics of mammals.

25. What are the four compositions of circulatory system of man?

26. In human beings, air enters into the body through ___________ and moves into __________. In fishes, water enters into the body through __________ and the dissolved oxygen diffuses into ___________.

27. Classify the following into producers, consumers, decomposers.

i) butterfly ii). grass hopper iii) calottes iv) snakes v). shoe flower vi) nitrobacteria

28. What is pollution?

29. Hydrogen is found to be a good choice among the alternative fuel, why?
1.Hydrogen can meet all the energy needs of human society, including power generation more efficiently and more economically than petrol fuels and in total compatibility with the environment.
2.Hydrogen is non - toxic, reasonably safe to handle, distribute and to be used as a fuel.

30. Radha prepared a solution which could be separated by filtration.
i) Name the type of solution.
ii) Is the solution transparent or opaque?
iii) Mention the nature of the solution.
iv) Mention the size of the solute particle.

31. What are the factors that affect solubility?

32. Complete the table given below:

 Element Atomic Mass Molecular Mass Atomicity Oxygen 16 32 __ Hydrogen 1 __ 2 Phosphorous 40 __ 4
33. Observe the given chemical change and answer the following:

i) Identify ‘A’ and ‘B’.
ii) Write the commercial name of calcium hydroxide.
iii) Identify products ‘C’ and 'D' , when HCl is allowed to react with calcium oxide.
iv) Say whether calcium oxide is acidic or basic.

34. Redox reactions are reactions during which electron transfer takes place. Here magnesium atom transfers two electrons one each to the two chlorine atoms.
i) What are the products of this reaction?
ii) Write the balanced equation for the complete reaction.
iii) Which element is being oxidized?
iv) Which element is being reduced?
v) Write the reduction part of the reaction.

35. Correct the given equation if it is wrong.
i) Metallic oxide + Acid $\longrightarrow$ Salt + Water
ii) Metal carbonate + Acid $\longrightarrow$ Salt + Water + Carbon dioxide
iii) Metal + Acid $\longrightarrow$ Salt + Carbon dioxide
iv) Metallic oxide + Water $\longrightarrow$ Salt + Oxygen

36. Coating the surface of iron with other metal prevents it from rusting. If it is coated with a thin layer of zinc, it is called _______ .

(galvanization / painting / cathodic protection)

37. 'A' is a metal used to build airplanes and other industrial parts. 'A' .reacts with strong
caustic alkalies and form 'B' along with hydrogen. Identify A and B.

38. Read each description given below and say whether it fits for ethanol or ethanoic acid. i) It is a clear liquid with a burning taste.
ii) It is used to preserve biological specimens in laboratories.
iii) It is used to preserve food and fruit juices.
iv) On cooling, it is frozen to form ice flakes which look like a glacier.

39. Reason and Assertion
Assertion :
Functional group is responsible for the characteristic properties of the compounds.
Reason    : The chemical properties of organic compounds are determined by functional groups.
Does the reason satisfy the given assertion?

40. When sodium salt of A is heated with soda lime (solid mixture of 3 parts of NaOH and 1 part of CaO) B gas is formed.
i) Identify A and B
ii) Write the corresponding chemical equation

41. Match the items in group A with the items in group B:

 Sl.No. Group-A Group-B 1. Small dimensions Kilometre 2. Large dimensions Screw gauge 3. Long distance Scale 4. Small distance Lightyear Altimeter
42. If an angel visits an asteroid called B 612 which has a radius of 20 m and mass of 104 kg, what will be the acceleration due to gravity in B 612 ?.

43. Observe the diagram and write the answer.

a) When a gun is fired, which law acts on it?
b) What is the action and reaction in this
c) Since the gun as a much greater mass than the bullet, how will be the acceleration of the gun?

44. Write any five achievements of Chandrayaan - I

45. Fuse wire is made up of an alloy of-------which has high resistance and ------- melting point.

46. Define electric power.

47. Light which is incident on a flat surface makes an angle of 15o with the surface.

i) What is the angle of incidence?
ii) What is the angle of reflection?|
iii) Find the angle of deviation.

48. The focal length of a concave lens is 2m. Calculate the power of the lens.

49. 4 x 5 = 20
50. Human evolution has undergone a record of changes during the past 15 million years.
i)Name the different species of mankind in chronological order from primitive to modern man.
ii)When were the primitive caves developed?
iii)Narrate the life led by early man like hominids.

51. What is known as pollination? List out biotic and abiotic factors which are involved in pollination?

52. With a suitable diagram, describe the structure and functions of the human heart.

53. Observe the picture given below and find out what type of energy is produced
i) Identify whether this energy is conventional or nonconventional.
ii) Draw the given diagram and label it with the parts given below:(battery, battery charger controller, solar incidence, DC load, battery system)
iii) In the given picture, _______energy is transformed into ______energy.

54. (a) List out the differences between atoms and molecules.

(b) Find the number of moles in copper containig 12.046 $\times$ 1023 molecules.

55. Homologous series predict the properties of the members of the series. Justify this statement through its characteristics.

56. Explain Newton's second law of motion w!th an example.

57. The effective resistance of three resistors connected in parallel is 60/47 ?. When one wire breaks, the effective resistance becomes 15/8 ohms. Find the resistance of the wire that is broken.