This quiz works best with JavaScript enabled. Home > Class 7 > Class 7 Science Chapter 4 Bases – Quiz 21 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 7 Science Chapter 4 Bases Quiz 21 (25 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. Example:purified water A) Acid. B) Base. C) Neutral. D) None of the above. Show Answer Correct Answer: C) Neutral. 2. How many nucleotide bases are there? A) 1. B) 2. C) 3. D) 4. Show Answer Correct Answer: D) 4. 3. Which of the following are found in RNA but not in DNA? A) Deoxyribose sugar and thymine. B) Ribose sugar and thymine. C) Ribose sugar and uracil. D) Deoxyriboce sugar and uracil. Show Answer Correct Answer: C) Ribose sugar and uracil. 4. Which of the following latin roots means one hundred? A) Cent. B) With. C) Port. D) Bene. Show Answer Correct Answer: A) Cent. 5. What PH number would be an example of a strong acid? A) 14. B) 13. C) 7. D) 1. Show Answer Correct Answer: D) 1. 6. Some bases present in their names, numbers written in Roman numerals, therefore: A) Chemistry likes to make my life difficult. B) Because there are elements that have variable load. C) All bases need this number in Roman digit. D) None of the above. Show Answer Correct Answer: B) Because there are elements that have variable load. 7. How do nitrogen bases contribute to the genetic code? A) By forming the backbone of the DNA strand. B) By determining the sequence of amino acids in proteins. C) By providing energy for cellular processes. D) By acting as catalysts in biochemical reactions. Show Answer Correct Answer: B) By determining the sequence of amino acids in proteins. 8. What is the formula of ammonia? A) H$_{2}$O. B) H$_{2}$. C) CO$_{2}$. D) NH$_{3}$. Show Answer Correct Answer: D) NH$_{3}$. 9. A substance with a pH of 6 is A) A base. B) An acid. C) Neutral. D) None of the above. Show Answer Correct Answer: B) An acid. 10. A student is studying a substance that tastes bitter and is slippery to touch. When phenolpthalein is added is turns magenta. What is the student most likely studying? A) Water (neutral). B) Lemon juice (acid). C) Drain cleaner (base). D) Salt solution (neutral). Show Answer Correct Answer: C) Drain cleaner (base). 11. The range of less than 7 to zero corresponds to substances with character ..... A) Basic. B) Acid. C) Salado. D) Redox. Show Answer Correct Answer: B) Acid. 12. Ascientisttestsasoilsamplefromanuncultivated fieldandconcludesthatthesoilishighly basicinnature.Shesuggests thataddingorganicmatterinthesoilcouldimprovethequalityofthe soil.Howdoesorganicmatterimprovethequalityofthesoil? A) Ittrapswatervaporandincreasesthemoisturecontent. B) Itreleasesacidswhichneutralizesthesoil. C) Itmakesthesoillightersothatitcanbeeasilytransported. D) Itactsasfoodfortheorganismsalreadypresentinthesoil. Show Answer Correct Answer: B) Itreleasesacidswhichneutralizesthesoil. 13. Cystosine is always paired with ..... A) Adenine. B) Thymine. C) Guanine. D) It doesn't match with anything. Show Answer Correct Answer: C) Guanine. 14. Which of the following is an Arrhenius Acid? A) Any otheruce. B) CO$_{3}$$^{2-}$. C) OH$^{-}$. D) H$_{3}$PO$_{4}$. Show Answer Correct Answer: D) H$_{3}$PO$_{4}$. 15. A solution has a pH of 6.2, if its hydrogen ion concentration is increased by 10 times, what would its new pH be? A) 5.2. B) 7.2. C) 8.2. D) 4.2. Show Answer Correct Answer: A) 5.2. 16. A type of chemical that forms solutions that taste sour, due to high concentrations of positive hydrogen ions A) Acid. B) Base. C) Salt. D) PH. Show Answer Correct Answer: A) Acid. 17. If a DNA strand has the sequence ATCG, what is the sequence of the complementary strand? A) Tagc. B) CGAT. C) ATCG. D) Cat. Show Answer Correct Answer: A) Tagc. 18. Characteristics such as a widow's peak or attached earlobes are determined by the genetic code. Which components of DNA are referred to as the genetic code? A) Phosphate groups. B) Nitrogenous bases. C) Deoxyribose sugars. D) Hydrogen bonds. Show Answer Correct Answer: B) Nitrogenous bases. 19. Phenolphthalein indicates ..... ? A) Strong Base. B) Strong Acid. C) Neutral. D) Watermelon. Show Answer Correct Answer: A) Strong Base. 20. PH < 7 A) Acid. B) Base. C) Neutral. D) None of the above. Show Answer Correct Answer: A) Acid. 21. Cuoh is a name base: A) Copper hydroxide. B) Copper hydroxide I. C) Copper hydroxide II. D) None of the above. Show Answer Correct Answer: B) Copper hydroxide I. 22. What does the Latin root bene mean? A) Shape. B) To carry. C) Good. D) To build. Show Answer Correct Answer: C) Good. 23. Formed when bases react with acids A) Acid. B) Base. C) Neutral. D) None of the above. Show Answer Correct Answer: C) Neutral. 24. What ions are there more of in acidic solutions? A) H+ (H3O+). B) OH-. C) All the above. D) None of the above. Show Answer Correct Answer: A) H+ (H3O+). 25. What are the products to a neutralization reaction? A) H$_{2}$ + Ionic Salt. B) H$_{2}$O + Ionic Salt. C) H$_{3}$O$^{+}$ + Ionic Salt. D) OH$^{-}$ + Ionic Salt. Show Answer Correct Answer: B) H$_{2}$O + Ionic Salt. ← 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