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. When an acid reacts with a metal, which gas is usually liberated?
[1 Mark]
(A) Oxygen
(B) Carbon dioxide
(C) Nitrogen
(D) Hydrogen
2. Which of the following is a natural acid-base indicator?
[1 Mark]
(A) Methyl orange
(B) Phenolphthalein
(C) Turmeric
(D) Universal indicator
3. What happens to the pH of a solution when the concentration of hydronium ions increases?
[1 Mark]
(A) The pH value increases
(B) The pH value decreases
(C) The pH value remains the same
(D) The pH value becomes exactly 14
4. The reaction of an acid with a base to give salt and water is known as:
[1 Mark]
(A) Decomposition reaction
(B) Displacement reaction
(C) Neutralisation reaction
(D) Precipitation reaction
5. Which compound is formed as a white precipitate when carbon dioxide gas is passed through lime water?
[1 Mark]
(A) Calcium bicarbonate
(B) Calcium carbonate
(C) Calcium chloride
(D) Calcium hydroxide
6. A solution turns red litmus blue, its pH is likely to be:
[1 Mark]
(A) 1
(B) 4
(C) 5
(D) 10
7. Which acid is naturally injected into the skin by a bee sting?
[1 Mark]
(A) Citric acid
(B) Acetic acid
(C) Methanoic acid
(D) Oxalic acid
8. What is the common name of the compound Ca(ClO)2?
[1 Mark]
(A) Baking soda
(B) Washing soda
(C) Bleaching powder
(D) Plaster of Paris
9. When sodium hydrogencarbonate is heated during cooking, which gas is released causing bread and cakes to rise?
[1 Mark]
(A) Carbon monoxide
(B) Hydrogen
(C) Carbon dioxide
(D) Oxygen
10. Which substance is used by doctors as a plaster for supporting fractured bones?
[1 Mark]
(A) Gypsum
(B) Plaster of Paris
(C) Limestone
(D) Bleaching powder
11. How many molecules of water of crystallisation are present in one formula unit of copper sulphate?
[1 Mark]
(A) 2
(B) 5
(C) 7
(D) 10
12. What is the pH of a neutral salt like sodium chloride?
[1 Mark]
(A) Exactly 7
(B) Less than 7
(C) More than 7
(D) Zero
13. During the chlor-alkali process, which gas is given off at the anode?
[1 Mark]
(A) Hydrogen
(B) Oxygen
(C) Chlorine
(D) Nitrogen
14. Which of the following is an olfactory indicator?
[1 Mark]
(A) Turmeric
(B) Red cabbage leaves
(C) Vanilla essence
(D) Litmus
15. Which medicine is commonly used for treating indigestion caused by excess stomach acid?
[1 Mark]
(A) Antibiotic
(B) Analgesic
(C) Antiseptic
(D) Antacid
16. What type of oxides are metallic oxides generally classified as?
[1 Mark]
(A) Acidic oxides
(B) Basic oxides
(C) Neutral oxides
(D) Inert oxides
17. The process of dissolving a concentrated acid or base in water is highly:
[1 Mark]
(A) Endothermic
(B) Exothermic
(C) Reversible
(D) Neutral
18. Why does dry HCl gas not change the colour of dry blue litmus paper?
[1 Mark]
(A) Because dry HCl is a base.
(B) Because litmus paper is defective.
(C) Because H+ ions are not produced in the absence of water.
(D) Because dry HCl gas is completely neutral.
19. Which acid is produced in our stomach to help in the digestion of food?
[1 Mark]
(A) Sulphuric acid
(B) Nitric acid
(C) Hydrochloric acid
(D) Acetic acid
20. Which chemical is used to remove the permanent hardness of water?
[1 Mark]
(A) Baking soda
(B) Washing soda
(C) Bleaching powder
(D) Sodium chloride
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