This quiz works best with JavaScript enabled. Home > Class 7 > Class 7 Science Chapter 4 Bases – Quiz 16 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 7 Science Chapter 4 Bases Quiz 16 (25 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. If there is excess hydrogen ions, the solution will be ..... A) Acidic. B) Basic. C) All the above. D) None of the above. Show Answer Correct Answer: A) Acidic. 2. Name the following compound Fe(OH)$_{2}$ A) Iron hydroxide. B) Iron oxygen hydroxide. C) Iron monoxide hydroxide. D) Iron (III) hydroxide. Show Answer Correct Answer: A) Iron hydroxide. 3. The ion released by all the bases when they are placed in water is: A) O$^{-}$. B) OH$^{+}$. C) OH$^{-}$. D) H$^{+}$. Show Answer Correct Answer: C) OH$^{-}$. 4. What effect does a base have on litmus paper? A) It turns blue litmus paper red. B) It turns red litmus paper blue. C) It has no effect on litmus paper. D) It bleaches litmus paper. Show Answer Correct Answer: B) It turns red litmus paper blue. 5. Reacts with metals to give off a gas A) Acid. B) Base. C) Neutral. D) None of the above. Show Answer Correct Answer: A) Acid. 6. Soap is an example of ..... A) A base. B) An acid. C) A neutral substance. D) None of the above. Show Answer Correct Answer: A) A base. 7. Which is a characteristic of a base? A) Tastes sour. B) Found mostly in foods. C) Feels slippery. D) Turn litmus paper red. Show Answer Correct Answer: C) Feels slippery. 8. Which of the following is true about alkalis? A) Alkalis are insoluble in water. B) Alkalis do not produce hydroxyl ions in water. C) Alkalis are bases that are soluble in water. D) All alkalis are acids. Show Answer Correct Answer: C) Alkalis are bases that are soluble in water. 9. Which of the following is not a cause of acid rain? A) Volcanic eruptions. B) Burning of fossil fuels. C) Electric cars. D) Combustion engines. Show Answer Correct Answer: C) Electric cars. 10. Which of the following household items is most likely to be acidic? A) Baking soda. B) Vinegar. C) Soap. D) Ammonia. Show Answer Correct Answer: B) Vinegar. 11. Read the given statements and select the correct option.Statement 1:Baking soda does not taste sour.Statement 2:Bases are sour in taste while acids are bitter in taste. A) Both statements 1 and 2 are true and statement 2 is the correct explanation of statement 1. B) Both statements 1 and 2 are true but statement 2 is not the correct explanation of statement 1. C) Statement 1 is true and statement 2 is false. D) Both statements 1 and 2 are false. Show Answer Correct Answer: C) Statement 1 is true and statement 2 is false. 12. A(n) ..... is a substance that produces hydronium ions in solution. A) Base. B) Acid. C) Indicator. D) Salt. Show Answer Correct Answer: B) Acid. 13. Which experiment helped identify the role of nitrogen bases in DNA? A) Hershey-Chase experiment. B) Meselson-Stahl experiment. C) Avery-MacLeod-McCarty experiment. D) Watson-Crick model. Show Answer Correct Answer: D) Watson-Crick model. 14. What PH number would be an example of a mild acid? A) 5. B) 1. C) 2. D) 9. Show Answer Correct Answer: A) 5. 15. The word paternity contains which of the following latin roots that means father? A) Mater. B) Pater. C) Spect. D) With. Show Answer Correct Answer: B) Pater. 16. Methyl orange is a substance that only identifies ..... changing from orange to red. A) Sales. B) Bases. C) Acids. D) None of the above. Show Answer Correct Answer: C) Acids. 17. The FULL NAME of the letter A from the DNA alphabet is: A) Adenine. B) Albertine. C) Augmented. D) Arginine. Show Answer Correct Answer: A) Adenine. 18. What is a DNA molecule made of? A) Base, sugar, phosphate. B) Base, sugar, coffee. C) Base, roof, height. D) DNA, sugar, phosphate. Show Answer Correct Answer: A) Base, sugar, phosphate. 19. A substance that tastes sour A) Base. B) Acid. C) Neutral. D) None of the above. Show Answer Correct Answer: B) Acid. 20. Which side of the equilibrium reaction is favored for a weak base? A) Product side. B) Neither side. C) Reactant side. D) None of the above. Show Answer Correct Answer: C) Reactant side. 21. The FULL NAME of the letter G from the DNA alphabet is: A) Guavine. B) Grapnel. C) Glycine. D) Guanine. Show Answer Correct Answer: D) Guanine. 22. Solve for x using the same base method.(-3)$^{x}$ = (-3)$^{13}$ A) 13. B) -3. C) X + 13. D) X-13. Show Answer Correct Answer: A) 13. 23. Which of the following substances is commonly used to neutralize stomach acid? A) Vinegar. B) Baking soda. C) Lemon juice. D) Salt. Show Answer Correct Answer: B) Baking soda. 24. What is the pH of a 1 x 10$^{-8}$ M solution of HNO$_{3}$? A) 8. B) 6. C) 7. D) 7.5. Show Answer Correct Answer: A) 8. 25. The word aquarium contains the root AQUA which means A) To hear. B) One hundred. C) Water. D) Bad. Show Answer Correct Answer: C) Water. ← PreviousNext →Related QuizzesClass 7 Science Chapter 4 Bases Quiz 1Class 7 Science Chapter 4 Bases Quiz 2Class 7 Science Chapter 4 Bases Quiz 3Class 7 Science Chapter 4 Bases Quiz 4Class 7 Science Chapter 4 Bases Quiz 5Class 7 Science Chapter 4 Bases Quiz 6Class 7 Science Chapter 4 Bases Quiz 7Class 7 Science Chapter 4 Bases Quiz 8Class 7 Science Chapter 4 Bases Quiz 9Class 7 Science Chapter 4 Bases Quiz 10 🏠 Back to Homepage 📘 Download PDF Books 📕 Premium PDF Books