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. What is the valency of carbon?
[1 Mark]
(A) 2
(B) 3
(C) 4
(D) 6
2. The unique ability of carbon to form bonds with other carbon atoms giving rise to large molecules is called:
[1 Mark]
(A) Isomerism
(B) Catenation
(C) Tetravalency
(D) Saponification
3. Which allotrope of carbon has its atoms arranged in the shape of a football?
[1 Mark]
(A) Diamond
(B) Graphite
(C) Buckminsterfullerene
(D) Soot
4. How many covalent bonds are present in a molecule of methane (CH4)?
[1 Mark]
(A) 1
(B) 2
(C) 3
(D) 4
5. What is the general formula for the homologous series of alkanes?
[1 Mark]
(A) CnH2n
(B) CnH2n-2
(C) CnH2n+2
(D) CnHn
6. Which functional group is present in the compound butanone?
[1 Mark]
(A) Alcohol
(B) Aldehyde
(C) Carboxylic acid
(D) Ketone
7. The IUPAC name of the compound CH3-CH2-OH is:
[1 Mark]
(A) Methanol
(B) Ethanol
(C) Propanol
(D) Ethanoic acid
8. Which reaction is commonly used in the hydrogenation of vegetable oils to form solid fats?
[1 Mark]
(A) Substitution reaction
(B) Addition reaction
(C) Oxidation reaction
(D) Displacement reaction
9. Esters react with sodium hydroxide to give an alcohol and a sodium salt of carboxylic acid. This reaction is called:
[1 Mark]
(A) Esterification
(B) Neutralisation
(C) Saponification
(D) Dehydration
10. A 5-8% solution of acetic acid in water is widely used as a preservative and is called:
[1 Mark]
(A) Absolute alcohol
(B) Glacial acetic acid
(C) Vinegar
(D) Brine
11. What happens when ethanol is heated at 443 K with excess concentrated sulphuric acid?
[1 Mark]
(A) It oxidises to ethanoic acid
(B) It dehydrates to form ethene
(C) It forms an ester
(D) It sublimates
12. The clusters of soap molecules that help in trapping and removing oily dirt in water are called:
[1 Mark]
(A) Isomers
(B) Cations
(C) Micelles
(D) Emulsions
13. By what unit do successive members of a homologous series differ in their molecular formula?
[1 Mark]
(A) -CH3
(B) -CH2
(C) -OH
(D) -C2H4
14. Which of the following hydrocarbons will give a yellow, sooty flame upon incomplete combustion?
[1 Mark]
(A) Saturated hydrocarbons in plenty of air
(B) Unsaturated hydrocarbons
(C) Pure methane
(D) Ethane
15. Chlorine reacts with saturated hydrocarbons at a fast rate in the presence of:
[1 Mark]
(A) Darkness
(B) Sunlight
(C) Cold water
(D) Sodium metal
16. Which functional group is characterised by the -COOH suffix?
[1 Mark]
(A) Alcohol
(B) Aldehyde
(C) Carboxylic acid
(D) Ketone
17. Hard water makes cleaning difficult with soap due to the formation of insoluble precipitates called scum. This is caused by which ions?
[1 Mark]
(A) Sodium and Potassium
(B) Calcium and Magnesium
(C) Chlorine and Fluorine
(D) Hydrogen and Hydroxide
18. What are structural isomers?
[1 Mark]
(A) Compounds with the same molecular formula but different chemical properties.
(B) Compounds with different molecular formulas but the same structure.
(C) Compounds with the same molecular formula but different carbon skeleton structures.
(D) Different physical states of the same element.
19. Which pure allotrope of carbon is the hardest known natural substance?
[1 Mark]
(A) Graphite
(B) Diamond
(C) Coal
(D) Buckminsterfullerene
20. What are the two major properties of carbon that lead to the huge number of carbon compounds?
[1 Mark]
(A) Tetravalency and Isomerism
(B) Catenation and High reactivity
(C) Tetravalency and Catenation
(D) Ductility and Malleability
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