This quiz works best with JavaScript enabled. Home > Class 7 > Class 7 Science Chapter 4 Bases – Quiz 20 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 7 Science Chapter 4 Bases Quiz 20 (25 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. Acids are stored in glass or metallic containers? Why? A) Metal Container because it increases the effect while doing a test. B) Glass Containers because the chemicals present in glass helps to emerge the colour more properly while doing a test. C) Metals as they would preserve the acid for a long time, increasing the effect. D) Glass containers because metals react with acids if acids are stored in metallic containers. Show Answer Correct Answer: D) Glass containers because metals react with acids if acids are stored in metallic containers. 2. What base pairs with adenine? A) Phosphate. B) Guanine. C) Cytosine. D) Thymine. Show Answer Correct Answer: D) Thymine. 3. Thermometer comes from the Greek therm meaning "heat" and meter meaning "measure." What does thermometer mean? A) A device used for measuring temperature. B) A device used to monitor progress. C) A device used to heat up the body. D) A device used to measure height. Show Answer Correct Answer: A) A device used for measuring temperature. 4. H+ and Oh ions when the substance called: A) Agua. B) Hydride. C) Hydroxide. D) None. Show Answer Correct Answer: A) Agua. 5. Sodium bicarbonate is a substance: A) Acidic. B) Neutral. C) Basic. D) None of the above. Show Answer Correct Answer: C) Basic. 6. Is it possible to have databases without tables related to each other? A) Yes, because the information can be accessed from the forms. B) No, because there are dependent tables that necessarily require information from other tables. C) All the above. D) None of the above. Show Answer Correct Answer: B) No, because there are dependent tables that necessarily require information from other tables. 7. Identify the base from the following compounds: A) $NH_3$. B) $H_2O$. C) $CO_2$. D) $H_2SO_4$. Show Answer Correct Answer: A) $NH_3$. 8. HCO$_{3}$$^{-}$ + H$_{2}$O $\rightarrow$ H$_{3}$O$^{+}$ + CO$_{3}$$^{2-}$Water is acting as A) A Bronsted Lowry base. B) A Bronsted Lowry acid. C) A strong acid. D) A weak acid. Show Answer Correct Answer: A) A Bronsted Lowry base. 9. Is the following substance an acid or a base? HCl A) Acid. B) Base. C) All the above. D) None of the above. Show Answer Correct Answer: A) Acid. 10. Which of these is a base? A) Hydrocloric acid. B) Sodium hydroxide. C) Nitric acid. D) Bromothymol blue. Show Answer Correct Answer: B) Sodium hydroxide. 11. The latin root mater means A) Mother. B) Father. C) To look. D) To make. Show Answer Correct Answer: A) Mother. 12. Which of the following are the characteristics of a BASE? A) Very bitter in taste. B) Have pH of less than 7. C) Turns blue litmus red. D) None of the above. Show Answer Correct Answer: A) Very bitter in taste. 13. Prejudice and judicial contain the latin root jud that means A) Judge. B) Good. C) Water. D) To send. Show Answer Correct Answer: A) Judge. 14. Weaker Bases have a pH closer to 7 A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: A) True. 15. What is the value of 1203$_{4}$? A) 67. B) 48. C) 54. D) 99. Show Answer Correct Answer: D) 99. 16. Acids will neutralize a base, and bases will neutralize acids. If you add a base to a solution containing a strong acid, what will happen to the pH of the solution? A) The pH will increase. B) The pH will decrease. C) The pH will stay the same. D) None of the above. Show Answer Correct Answer: A) The pH will increase. 17. If there are 5 red sour patch out of 20 total sour patch, what percent are red? A) 15%. B) 20%. C) 25%. D) 30%. Show Answer Correct Answer: C) 25%. 18. What is the pH range of acids? A) 0 to 7. B) 7 to 14. C) 0 to 14. D) 7 to 10. Show Answer Correct Answer: A) 0 to 7. 19. What is the pH range of a basic solution? A) 0-3. B) 4-6. C) 7. D) 8-14. Show Answer Correct Answer: D) 8-14. 20. Carbonic acid is present in ..... A) Lemon juice. B) Tomato. C) Soft drinks. D) Baking powder. Show Answer Correct Answer: C) Soft drinks. 21. What is the name of the base with the formula $Ca(OH)_2$ A) Calcium hydroxide. B) Calcium oxide. C) Calcium hydride. D) Calcium carbonate. Show Answer Correct Answer: A) Calcium hydroxide. 22. What is the role of a base in a neutralization reaction? A) It donates protons. B) It accepts protons. C) It releases hydrogen gas. D) It forms a precipitate. Show Answer Correct Answer: B) It accepts protons. 23. What are the proper complementary base-pairs? A) A T and G C. B) A G and C T. C) G T and A C. D) A C and T G. Show Answer Correct Answer: A) A T and G C. 24. Which molecules forms the sides (backbone) of the DNA ladder? A) Sugars. B) Nitrogen bases. C) All of these. D) Phosphates. Show Answer Correct Answer: D) Phosphates. 25. Which of the following solutions would be a weak alkali? A) Sodium hydroxide (NaOH). B) Potassium hydroxide (KOH). C) A solution of sodium hydroxide where less than 30% of molecules dissociate. D) Calcium hydroxide in excess of water. Show Answer Correct Answer: C) A solution of sodium hydroxide where less than 30% of molecules dissociate. ← 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