8th Standard Science Chapter-9 November 30, 2020December 26, 2020wefru8th Standard Science quiz Chapter-9 0 Created on November 30, 2020 By wefru8th Standard Science Chapter 9CHECK YOUR SKILLS BROADLY 1 / 10Q11. Which of the following is the atomic number of an element that forms basic oxide? a) 18 b) 17 c) 19 d) 15 2 / 10Q12. The elements A, B and C belong to group 2, 14 and 16 respectively, of the periodic table. Which of the two elements will form covalent bonds? a) A and B b) B and C c) C and A d) None of these 3 / 10Q13. Which of the following does not decrease while moving down the group of the periodic table? a) Atomic radius b) Metallic character c) Number of shells in the atom d) Valence electrons 4 / 10Q11. The organic compounds having functional group are known as: a) Aldehyde b) Ketone c) Carboxylic acids d) Alcohol 5 / 10Q12. From which of the following substance pencil lead is formed? a) Charcoal b) Wood c) Lead d) Graphite 6 / 10Q13. Ester is formed by the reaction between: a) An acid and an alcohol b) An acid and a base c) A base and an alcohol d) An acid and an alkene 7 / 10Q14. What is denatured alcohol? a) Ethyl alcohol which has been made unfit for drinking purpose by adding small amount of poisonous substance a) Ethyl alcohol which has been made unfit for drinking purpose by adding small amount of poisonous substance c) Alcohol having properties of an acid d) Ethyl alcohol containing 60% of water by weight 8 / 10Q15. Which of the following substance produces brisk effervescence with baking soda solution? a) Ethanoic acid b) Table salt c) Vinegar c) Vinegar d) Sunflower oil 9 / 10Question 25.Match the chemical substances given in Column (A) with their appropriate application given in Column (B).Column IColumn II(A) Bleaching powder(i) Preparation of glass(B) Baking soda(ii) Production of H2 and Cl2(C)Washing soda(iii) Decolourisation(D) Sodium chloride (a) A-(ii), B-(i), C-(iv), D-(iii) (b) A-(iii), B-(ii), C-(iv), D-(i) (c) A-(iii), B-(iv), C-(i), D-(ii) (d) A-(ii), B-(iv), C-(i), D-(iii) 10 / 10Question 24.To protect tooth decay, one is advised to brush the teeth regulary. The ingredient of the paste which checks tooth decay is: (a) acidic (b) basic (c) neutral Your score isThe average score is 0% LinkedIn Facebook Twitter VKontakte 0% Restart quiz
