Education
Class 10 Chemistry Chapter 20 Water Test 4 – Model Papers 2027
Grade 10 Chemistry Chapter 20 Water Test 4
Prepare for the Punjab Board Class 10 Chemistry Examination 2027 with Chapter 20: Water – Class Test No. 4. This Chemistry test is part of our comprehensive Punjab Board 2027 Model Papers and Chapter-Wise Test Series, designed to help students revise important concepts and assess their exam preparation. Based on the new Class 10 Chemistry syllabus issued by PECTAA Punjab, these model papers support effective revision, self-assessment, and board examination practice. Attempt this Class 10 Chemistry Chapter 20 Water Test to strengthen your understanding and prepare confidently for the 2027 annual examinations.
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Chapter: 20
Total Time: 35 min
CHAPTER WISE CLASS TEST
(Test # 4)Chemistry
Total Marks: 25
ABCD
1ABCD
2ABCD
3ABCD
ABCD
4ABCD
5ABCD
6ABCD
ABCD
7ABCD
8ABCD
NOTE: Four possible answers A, B, C and D to each question are given. The choice which you think is correct, fill that circle in front of that question with Marker or Pen ink. Cutting or filling two or more circles will result in zero mark in that question.
TIME: 10 MinOBJECTIVEMARKS: 8
Q.1:(08)
1.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
2.How many people suffer from water-borne diseases every year?
(A) 100 million(B) 300 million(C) 500 million(D) 700 million
3.Nutrients required in very small amount for plant growth are called:
(A) Macro-nutrients(B) Secondary nutrients(C) Micro-nutrients(D) Primary nutrients
4.The fertilizer harmful to paddy rice is:
(A) Super phosphate(B) Ammonium nitrate(C) Urea(D) Potassium sulphate
5.Too much quantity of micro-nutrients may be:
(A) Beneficial(B) Poisonous(C) Neutral(D) Helpful for growth
6.The desired elements in fertilizer must be present in:
(A) Insoluble form(B) Gaseous form(C) Water soluble form(D) Solid crystalline form only
7.Fertilizers which increase the resistance of plants towards diseases and make plants strong by healthy root development are:
(A) Nitrogenous fertilizers(B) Phosphate fertilizers(C) Potassium fertilizers(D) Magnesium fertilizers
8.The most widely used nitrogen fertilizer in Pakistan is:
(A) Ammonium sulphate(B) Ammonium nitrate(C) Urea(D) Ammonium chloride
TIME: 25 MinSUBJECTIVEMARKS: 17
(PART – I)
Q.2 Write short answers to following questions.(6×2=12)
i.What is the difference between sedimentation and filtration?
Ans: In sedimentation, suspended particles settle at the bottom due to gravity when water is left undisturbed. In filtration, the water is passed through a filter (sand, gravel, filter paper) which holds back the suspended particles.
ii.What is the sequence of steps in treating domestic water supply?
Ans: Screening → sedimentation (with coagulants) → filtration → disinfection (chlorination) → storage and supply.
iii.Why fertilizers containing nitrogen element are added into the soil?
Ans: Plants need nitrogen to make proteins and chlorophyll. Soil often lacks enough nitrogen, so nitrogen fertilizers are added to give healthy green growth and a better yield.
iv.What is the annual rainfall in northern Pakistan?
Ans: Northern Pakistan receives much more rainfall than the rest of the country. (Write the exact figure given in your textbook.)
v.What is trachoma disease?
Ans: Trachoma is a bacterial eye infection spread through unclean water and poor hygiene. It causes irritation and scarring of the eyelids and can lead to blindness.
vi.What is the role of nitrogen in plant growth?
Ans: Nitrogen helps leaf and stem growth, is part of chlorophyll and proteins, and gives plants a dark green colour.
(PART – II)
Note: Attempt the following question.
Q.3: How can you avoid the negative effects of pollutants present in water?(5)
Ans:
• Treat industrial and domestic waste-water before releasing it into rivers and lakes.
• Use fertilizers and pesticides in controlled amounts so they do not wash into water.
• Remove suspended solids by sedimentation and filtration, and kill microbes by chlorination or boiling.
• Remove odour and colour with activated charcoal.
• Dispose of plastics and heavy-metal wastes properly and spread public awareness.
