StudentAidUnit 20: Unit 20: Water — Mcqs
10th Class Chemistry · Unit 20: Water
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Choose and tick the correct answer from the given choices.
1.The pH of distilled water is:
2.The unpleasant odours in water can be removed by:
3.The source of harmful microbes in natural water:
4.Which gases are dissolved in natural water from the atmosphere through diffusion?
- a O2 and CO2
- b N2 and CO2
- c O2 and N2
- d O2, N2 and CO2
5.The fertilizer harmful to paddy rice is:
6.Fertilizers which increase the resistant of plants towards diseases and make plants strong by healthy root development are:
SLO Based Multiple Choice Questions
Water
7.Which liquid is essential for all form of life on earth?
8.In what amount water is present in all living organisms?
9.Identifying the presence of water has many important applications which include:
10.Testing water is important for industries:
11.Maximum number of water of crystallization in copper sulphate is:
12.The color of hydrated copper (II) sulphate is:
13.Color of anhydrous copper (II) sulphate:
14.Water needed to change the color of copper (II) sulphate (anhydrous) to hydrated copper (II) sulphate:
15.Freezing point of water at STP:
16.Boiling point of water varies with impurities:
17.What is the effect of presence of impurities in water at its freezing point?
18.Boiling point of water is also affected by:
Difference between distilled water and Tap water
19.Water supplied to our homes through pipes is?
20.Tap water contains minerals like salt which depend upon:
21.pH of tap water is:
22.Tap water is conductor of electricity due to:
23.Distillation is a combination of two processes:
24.Distillation is responsible of removing of substances from water:
25.Distilled water is not used for:
Substances present in water obtained from natural sources
26.Which gas enters the natural water from the atmosphere?
27.Bacterial contents in water produce various diseases except one:
28.Heavy metals in natural water include:
29.Which metals are considered to increase the risk of cancer disease:
30.The human organs which have been noticed to have plastics are:
31.Which process is responsible for entering nitrates and phosphates in natural water?
32.Eutrophication is a process in which water contains excessive amounts of:
33.Dissolved oxygen level in water is decreased by:
Treatment of Domestic water supply
34.Which one is not an impurity of water obtained from natural sources?
35.Insoluble impurities present in water are:
36.The process of removing insoluble impurities of bigger size is called:
- a Filtration
- b Sedimentation
- c Crystallization
- d Distillation
37.During sedimentation suspended particle settle down due to:
38.Process of removing of impurities of small size from water is called:
39.Which material is taken as filter during filtration of water?
40.All harmful bacteria and microbes of water are killed during:
41.Colour and odur of water is removed by using:
42.Exposing water to direct air in atmosphere is called:
Effects of pollutants present in water
43.Which type of ecosystem is disturbed by eutrophication?
- a Glacier ecosystem
- b Air ecosystem
- c Water ecosystem
- d Soil ecosystem
44.The number of million people suffering from water borne diseases per anum is:
45.Million of people are suffering from a water borne disease trachoma which causes:
Water scarcity in Pakistan
46.Depending upon the annual rainfall every year Pakistan belongs to:
- a Arid region
- b Semi-arid region
- c Complete barren
- d None of all
47.Which areas of Pakistan receive rainfall below 200mm per year?
- a East of Pakistan
- b Western areas
- c Northern areas
- d Southern areas
48.Which one is not a cause of water scarcity in Pakistan?
Elements Essential for plant Growth
49.The nutrients required in very small amount for the growth of plants are called:
50.Range of micro – nutrients in grams per acre is:
- a 2 – 6
- b 6 – 100
- c 6 – 200
- d 6 – 300
51.Which one is not a macronutrient:
52.Macronutrients are required in kg per acre:
- a 5 – 100
- b 100 – 200
- c 5 – 200
- d 5 – 10
Fertilizers
53.Essential elements for plant growth are:
54.Which one is not a role of fertilizers?
55.Which one is a property of a good fertilizer?
56.Ammonium nitrate is useful fertilizer for many crops except:
57.Which fertilizer is required to stimulate early growth in plants?
58.Which element is required for the formation of starch and sugar of plants?
- a Nitrogenous fertilizers
- b Potassium fertilizers
- c Biofetilizers
- d Phosphorous fertilizers