CBES Board Class 10 MCQ Quiz Hub

1. The ratio of hydrogen (H) and oxygen (O) in water molecule by volume is
0.084027778
0.043055556
0.125694444
0.167361111

2. What is the fourth step of raw water treatment?
sedimentation
coagulation
filtration
chlorination

3. The hardness that cannot be removed by boiling is called
temporary hardness
permanent hardness
semi temporary hardness
semi permanent hardness

4. The density of water becomes maximum at 5 °C 12 °C
10 °C
4 °C
5 °C
12 °C

5. Step of sewage water treatment in which sewage is placed in tanks and aerated with large blowers is called
primary sewage treatment
secondary sewage treatment
activated sludge treatment
chlorination

6. What percentage of fresh water is available to man?
0.2
0.02
0.002
0.0002

7. What is the second step of raw water treatment?
sedimentation
coagulation
filtration
chlorination

8. What is the percentage of water from rivers and lakes?
0
0.002
0.006
0.021

9. Permanent hardness of water is caused due to the presence of dissolved
calcium hydrogen carbonates
magnesium hydrogen carbonates
chlorides of magnesium
Sulphates of magnesium

10. Step of sewage water treatment in which there are some aeration and organic material is converted to inorganic materials is called
primary sewage treatment
secondary sewage treatment
activated sludge treatment
chlorination

11. Temporary hardness of water is caused due to the presence of dissolved
calcium hydrogen carbonates only
magnesium hydrogen carbonates only
Sulphates and chlorides of calcium or magnesium
calcium hydrogen carbonates and magnesium hydrogen carbonates

12. Which of the following is an intestinal disease caused by bacteria such as E.coli?
cholera
dysentery
jaundice
hepatitis

13. What is the percentage of groundwater?
0
0.002
0.006
0.021

14. Which type of Hepatitis spreads through polluted water?
hepatitis A only
hepatitis B only
hepatitis C
hepatitis A and B

15. Which of the following is the most abundant salt in seawater?
magnesium chloride
calcium chloride
sodium chloride
sodium nitrate

16. Which of the following is a disease in which excess of bile from the liver enters the blood and causes yellowness of skin and eyes?
Cholera
dysentery
jaundice
hepatitis

17. Property due to which water acts as a universal solvent is its
polarity only
ability to make hydrogen bond only
strong dipole dipole interaction
polarity and ability to make hydrogen bond

18. What is the first step of raw water treatment?
sedimentation
coagulation
filtration
chlorination

19. The fourth step of sewage water treatment is called
primary sewage treatment
secondary sewage treatment
activated sludge treatment
chlorination

20. Water exists in how many states?
1
2
3
4

21. How many basic steps are involved in sewage water treatment?
three
four
five
six

22. What is the percentage of water from glaciers and ice caps?
0 0.
002 0
.006
0.021

23. What is the third step of raw water treatment?
sedimentation
coagulation
filtration
chlorination

24. Which of the following is a dangerous intestinal disease that spreads by polluted water containing bacteria?
typhoid
dysentery
amoeba
hepatitis

25. What happens to water on cooling?
it expands up to 4 °C
it contracts up to 4 °C
it expands up to 2 °C
it contracts up to 2 °C

26. Out of total the amount of water available for human use is
0.003
0.002
0.4
0.5

27. What is the percentage of atmospheric water?
0 0.
002
0.006
0.021

28. Step of sewage water treatment in which some of the solids are removed as sludge is called
primary sewage treatment
secondary sewage treatment
activated sludge treatment
chlorination

29. The second step of sewage water treatment is called
primary sewage treatment
secondary sewage treatment
activated sludge treatment
chlorination

30. Process in which water is filtered through sand and gravel is called
sedimentation
coagulation
filtration
chlorination

31. How many basic steps are involved in raw water treatment?
three
four
five
six

32. Natural water is
pure
impure
non distilled
distilled

33. Addition of washing soda removes
softness of water
temporary hardness of water
permanent hardness of water
hydrogen from water

34. The first step of sewage water treatment is called
primary sewage treatment
secondary sewage treatment
activated sludge treatment
chlorination

35. Water which forms scum with soap is called
hard water
soft water
distilled water
non distilled water

36. During thunderstorms, water dissolves
dust particles
HCl
nitric acid
clouds

37. Hepatitis is caused by
virus
bacteria
amoeba
parasite

38. Temporary hardness can be removed by adding
lime
carbon
oxygen
slaked lime

39. Water that easily gives lather with soap is called
hard water
soft water
dirty water
clean water

40. The third step of sewage water treatment is called
primary sewage treatment
secondary sewage treatment
activated sludge treatment
chlorination

41. Water that gives little lather is called
hard water
soft water
dirty water
clean water

42. Water exists in how many different states on Earth?
one
two
three
four

43. What is the percentage of water from oceans?
0
0.002
0.006
0.97

44. The hardness which can be removed by boiling is called
permanent hardness
temporary hardness
stiffness
toughness

45. What percentage of sodium chloride is present in seawater?
0.02
0.1
0.034
0.01

46. Which of the following is an intestinal disease caused by a parasite, entamoeba?
cholera
dysentery
jaundice
hepatitis

47. What is given when electricity is passed through acidified water in a voltammeter?
oxygen only
hydrogen only
nitrogen
oxygen and hydrogen

48. Which of the following is transmitted by fecal contamination of water or food by an encysted organism?
primary sewage treatment
secondary sewage treatment
activated sludge treatment
chlorination

49. Which of the following is a disease that proceeds from obstruction of the liver?
cholera
dysentery
jaundice
hepatitis

50. How much percentage of the Earth's crust is covered by water?
0.69
0.71
0.8
0.75

51. Hard water can block radiators due to the formation of
insoluble calcium and magnesium salts
insoluble sodium salts
insoluble phosphate salts
insoluble potassium salts

52. What is the total amount of water present on Earth?
1.33 billion cubic kilometers
1.33 billion cubic meters
1.33 million cubic kilometers
1.33 million cubic meters

53. Ice floats on top of the water because
water expands on freezing
water contracts on freezing
ice is lighter than water
none of above

54. Process in which water is allowed to stand in a reservoir is called
sedimentation
coagulation
filtration
chlorination

55. Which of the following is an acute inflammation of the liver?
cholera
dysentery
jaundice
hepatitis

56. Water in swimming pools is purified by adding sodium chlorine phosphorus potassium
sodium
chlorine
phosphorus
potassium

57. Water that does not form scum is called
hard water
soft water
dirty water
clean water

58. Process in which chlorine is added to water to kill any remaining bacteria is called
sedimentation
coagulation
filtration
chlorination

59. Process in which water is treated with slaked lime and alum is called
sedimentation
coagulation
filtration
chlorination

60. Water that does not give scum with soap is called
hard water
soft water
distilled water
alcoholic water