#### Creative Questions Part-VI

10th Standard

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Science

Time : 01:30:00 Hrs
Total Marks : 100

Part-A

23 x 1 = 23
1. A water tanker filled up to $\frac{2}{3}$ of its height is moving with a uniform speed, on sudden application of the brake, the water in the tank would

(a)

move backward

(b)

be unaffected

(c)

rise upwards

(d)

move forward

2. Convex lenses are used in

(a)

camera

(b)

magnifying lens

(c)

microscope

(d)

all the above

3. Temperature is a property which determines

(a)

amount of heat a body contains

(b)

total absolute energy a body has

(c)

direction of flow of heat

(d)

thermal energy

4. In which one of the following heating effect the current is undesirable?

(a)

electric iron

(b)

electric motor

(c)

fuse wire

(d)

electric bulb

5. Loudness of sound varies directly with vibrating body's

(a)

intensity

(b)

amplitude

(c)

pitch

(d)

quality

6. Which of the following is used to detect the presence of block in blood vessels.

(a)

15P31

(b)

15P32

(c)

26Fe59

(d)

11Na24

7. The number of molecules of CO2 present in 44 g of CO2 is:

(a)

6.023 x 1023

(b)

3 x 1023

(c)

12 X 1023

(d)

3 x 1010

8. Which among the following are periodic properties.

(a)

Ionisation energy

(b)

(c)

eleetronegativity

(d)

all the above

9. The solubility of gases in liquid increases with ____________

(a)

increased volume

(b)

increased pressure

(c)

decreased pressure

(d)

none of these

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

(a)

Surface area of reactants

(b)

Pressure

(c)

Temperature

(d)

all the above

11. When ethanol reacts with acidified K2Cr2O7 the orange color of K2Cr2O7 changes to _____________

(a)

yellow

(b)

red

(c)

purple

(d)

green

12. The_______ glands are modified glands of the skin

(a)

perineal

(b)

mammary

(c)

gastric

(d)

salivary

13. Plasma is slightly alkaline, containing noncellular substances which constitutes about ___________ of the blood.

(a)

55%

(b)

44%

(c)

35%

(d)

50%

14. Sneezing, yawning etc are examples of _______

(a)

voluntary actions

(b)

involuntary actions

(c)

reflex actions

(d)

planned actions

15. The deficiency of insulin causes ______

(a)

diabetes mellitus

(b)

tetany

(c)

thyroid dysfunction

(d)

cretinism

16. An oocyte is alive for about________ after it is released from the follicle

(a)

24hours

(b)

12hours

(c)

15hours

(d)

20 hours

17. v shaped chromosomes are called_______

(a)

metacentric

(b)

acrocentric

(c)

submetacentric

(d)

telocentric

18. Biogenetic law or Recapitulation theory was given by__________

(a)

Leonardo da vinci

(b)

Ernst Haeckel

(c)

Oparin

(d)

Haldane

19. _________ is a hybrid of wheat and rye

(a)

Triticale

(b)

Raphano bras sica

(c)

Bananas

(d)

Water melons

20. Obesity is not a risk factor for ___________

(a)

AIDS

(b)

diabetes

(c)

arthritis

(d)

CHD

21. Choose the non-renewable energy resource

(a)

Solar energy

(b)

Water

(c)

Minerals

(d)

Wind

22. Tocreate animations, cartoons and games easilywecan use_________

(a)

Paint

(b)

(c)

LINUX

(d)

Scratch

23. Part-B

23 x 2 = 46
24. What is equilibrium?

25. Draw images formation due to refraction through a concave lens.

26. What is meant by real expansion?

28. Why longitudinal waves are called pressure waves?

29. What is meant by chain reaction?

30. In magnesium sulphite, the ratio by mass of Mg and S is 3 : 4. What is the ratio of the number of Mg and S atoms?

31. Give appropriate reasons for alloying.

32. Define dissolution.

33. Define pH.

34. What are hard and soft soap?

35. What is anaerobic respiration?

36. Write a note on the feeding habit &digestion in leech.

37. Draw Root tip with Root hairs and label the parts

38. What is myelin sheath?

39. Why is cortisol known as life saving hormone?

40. Define pollination.

41. What is nucleolar organizer?

42. Give some examples of vestigial organs in man.

43. Give the importance of  Stem cell therapy?

44. What are carcinogens? Mention their types.

45. Mention the advantages of using tidal energy.

46. Which is important - Hardware or Software?

47. Part-C

23 x 4 = 92
48. Give examples for Newton's third law.

49. Explain the refraction of light through a glass prism.

50. With an illustration, explain the method of Calculation for arial expansion of an object.

51. 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?

52. Write the applications of Doppler effect.

53. Explain the principle & structure of atom bomb.

54. Give the applications of Avogadro's hypothesis.

55. How is zinc blende concentrated? Explain it with a neat diagram

56. Write some solubility substances in water at 25°C.

57. Explain the classification based on the direction of the reaction.

58. What are the advantages of detergents over soaps?

59. Why is a dicot leaf described as dorsiventral?

60. Explain the Digestive System of Rabbit

61. Write a note an ABO blood grouping.

62. Tabulate the different parts of the brain and their functions.

63. In botanical gardens and tea gardens the gardeners trim the plants regularly so that they remain bushy. Write the scientific explanation of this practice.

64. Write a note on agents of pollination.

65. Mala had a huge scar on her cheek after she met with fire accident during her college days. She is worried ifher baby would inherit the scar she had acquired. She clarified with her doctor, she need not worry about it, as her scar is an acquired trait.
(i) What are acquired traits?
(ii) How is it different from inherited traits?

66. Explain Use and Disuse theory.

67. Write a note an selection.

68. Write a note on Obesity.

69. Explain the waste water treatment process

70. Explain in detail the uses and main parts of the 'SCRATCH' animation software

71. Part-D

7 x 7 = 49
72. Force of 50 N acts perpendicular on a body, which is fixed at a point O. The distance of point of action of force from O is 5 cm. Find the moment of force.

73. When an object is placed at 25cm from a concave lens, a virtual image is produced at a distance of 10cm. Calculate the magnification produced by the lens.

74. A metal scale is graduated at 0°C so what would be original length of the object when measured at 25°C, reads 50 Cm? For a metal, the coefficient of linear expansion is 18 x 10-6/ °C.

75. A 110 V light bulb takes 0.9 A current and operates 12h / day. Determine the energy consumed by the bulb for 30 days.

76. An observer approaches a stationary sound source 1000 Hz at twice the speed of sound. What frequency does the observer hear?

77. Convert IBq into curie.

78. Find the mass of 2.5 mole of oxygen atom.