ACME ACADEMY

WEEKLY EVALUATION TEST

Subject: Science
Time Limit: 20 Mins
Max Marks: 20 Marks
Student Name:
Roll Number:
Class / Sec:
Date:

GENERAL INSTRUCTIONS:

  1. All questions are compulsory. Carefully read all instructions before starting.
  2. The question paper contains 20 questions.
  3. There is no negative marking for incorrect answers.
  4. Use of mobile phones, smartwatches, or calculators is strictly prohibited during the exam.
1. Which of the following is not a physical change?
[1 Mark]
(A) Boiling of water to give water vapour
(B) Melting of ice to give water
(C) Dissolution of salt in water
(D) Combustion of Liquefied Petroleum Gas (LPG)
2. The following reaction is an example of a: 4NH3(g) + 5O2(g) -> 4NO(g) + 6H2O(g)
[1 Mark]
(A) Displacement reaction
(B) Combination reaction
(C) Redox reaction
(D) Both Displacement and Redox reaction
3. Which of the following statements about the given reaction are correct? 3Fe(s) + 4H2O(g) -> Fe3O4(s) + 4H2(g)
[1 Mark]
(A) Iron metal is getting oxidised
(B) Water is getting reduced
(C) Water is acting as reducing agent
(D) Both Iron is oxidised and Water is reduced
4. Which of the following are exothermic processes?
[1 Mark]
(A) Reaction of water with quick lime
(B) Dilution of an acid
(C) Evaporation of water
(D) Both Reaction of water with quick lime and Dilution of an acid
5. A dilute ferrous sulphate solution was gradually added to the beaker containing acidified permanganate solution. The light purple colour of the solution fades and finally disappears. Which of the following is the correct explanation for the observation?
[1 Mark]
(A) KMnO4 is an oxidising agent, it oxidises FeSO4
(B) FeSO4 acts as an oxidising agent and oxidises KMnO4
(C) The colour disappears due to dilution; no reaction is involved
(D) KMnO4 is an unstable compound and decomposes in presence of FeSO4
6. Which among the following is a double displacement reaction?
[1 Mark]
(A) Pb + CuCl2 -> PbCl2 + Cu
(B) Na2SO4 + BaCl2 -> BaSO4 + 2NaCl
(C) C + O2 -> CO2
(D) CH4 + 2O2 -> CO2 + 2H2O
7. Solid calcium oxide reacts vigorously with water to form calcium hydroxide accompanied by liberation of heat. This process is called slaking of lime. Which among the following is true about slaking of lime?
[1 Mark]
(A) It is an endothermic reaction
(B) It is an exothermic reaction
(C) The pH of the resulting solution will be more than 7
(D) Both exothermic and pH more than 7
8. Barium chloride on reacting with ammonium sulphate forms barium sulphate and ammonium chloride. Which of the following correctly represents the type of the reaction involved?
[1 Mark]
(A) Displacement reaction
(B) Precipitation reaction
(C) Combination reaction
(D) Double displacement reaction
9. Electrolysis of water is a decomposition reaction. The mole ratio of hydrogen and oxygen gases liberated during electrolysis of water is:
[1 Mark]
(A) 1:1
(B) 2:1
(C) 4:1
(D) 1:2
10. Which of the following is an endothermic process?
[1 Mark]
(A) Dilution of sulphuric acid
(B) Sublimation of dry ice
(C) Condensation of water vapours
(D) Respiration in human beings
11. In the double displacement reaction between aqueous potassium iodide and aqueous lead nitrate, a yellow precipitate of lead iodide is formed. While performing the activity if lead nitrate is not available, which of the following can be used in place of lead nitrate?
[1 Mark]
(A) Lead sulphate (insoluble)
(B) Lead acetate
(C) Ammonium nitrate
(D) Potassium sulphate
12. Which of the following gases can be used for storage of fresh sample of an oil for a long time?
[1 Mark]
(A) Carbon dioxide or oxygen
(B) Nitrogen or oxygen
(C) Carbon dioxide or helium
(D) Helium or nitrogen
13. The condition produced by aerial oxidation of fats and oils in foods marked by unpleasant smell and taste is called:
[1 Mark]
(A) Antioxidation
(B) Reduction
(C) Rancidity
(D) Corrosion
14. When Ag is exposed to air it gets a black coating of:
[1 Mark]
(A) AgNO3
(B) Ag2S
(C) Ag2O
(D) Ag2CO3
15. What type of chemical reactions take place when electricity is passed through water?
[1 Mark]
(A) Displacement
(B) Combination
(C) Decomposition
(D) Double displacement
16. A substance added to food containing fats and oils is called:
[1 Mark]
(A) Oxidant
(B) Rancid
(C) Coolant
(D) Antioxidant
17. The chemical formula of lead sulphate is:
[1 Mark]
(A) Pb2SO4
(B) Pb(SO4)2
(C) PbSO4
(D) Pb2(SO4)3
18. Which information is not conveyed by a balanced chemical equation?
[1 Mark]
(A) Physical states of reactants and products
(B) Symbols and formulae of all the substances involved in a particular reaction
(C) Number of atoms/molecules of the reactants and products formed
(D) Whether a particular reaction is actually feasible or not
19. Chemically, rust is:
[1 Mark]
(A) Hydrated solid iron oxide
(B) Hydrated ferrous oxide
(C) Only ferric oxide
(D) Hydrated ferric oxide
20. We store silver chloride in a dark coloured bottle because it is:
[1 Mark]
(A) A white solid
(B) Undergoes redox reaction
(C) To avoid action by sunlight
(D) None of the above
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