This quiz works best with JavaScript enabled. Home > Class 7 > Class 7 Science Chapter 4 Bases – Quiz 13 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 7 Science Chapter 4 Bases Quiz 13 (25 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. The FULL NAME of the letter C from the DNA alphabet is: A) Cytosine. B) Cysteine. C) Cryosine. D) Calypsine. Show Answer Correct Answer: A) Cytosine. 2. What is the conjugate base of H$_{2}$SO$_{4}$? A) SO$_{4}$$^{2-}$. B) H$_{2}$SO$_{3}$. C) HSO $ _ {3} $$^{1-} $. D) HSO $ _ {4} $$^{1-} $. Show Answer Correct Answer: D) HSO $ _ {4} $$^{1-} $. 3. Which one of these substances will have a NEUTRAL pH? A) Lemon juice. B) Coffee. C) Bleach. D) Water. Show Answer Correct Answer: D) Water. 4. The root word port (from Latin) means "carry." These days, almost everyone has a portable phone.Transportation can take the form of plane, train or car travel. "Ex-" is a prefix that means "out" or "from." Which word means "to send out goods to be sold in another country" ? A) Exist. B) Exclude. C) Extend. D) Export. Show Answer Correct Answer: D) Export. 5. What is the role of DNA polymerase during DNA replication? A) Unzips the DNA strands. B) Adds nucleotides to the growing DNA strand. C) Joins Okazaki fragments. D) Synthesizes RNA primers. Show Answer Correct Answer: B) Adds nucleotides to the growing DNA strand. 6. A pH of 7 is a(n) ..... ? A) Acid. B) Base. C) Neutral. D) Litmus paper. Show Answer Correct Answer: C) Neutral. 7. What is the meaning of complementary base paring, in DNA structure? A) Nucleotide bases always exist in the same proportions in a DNA molecule. B) Each type of base always pairs with one other type, C with T and A with G. C) This is the idea that nucleotide bases always pair with nucleotide bases. D) Each type of nucleotide base always pairs with just one other type of base, C with G and A with T. Show Answer Correct Answer: D) Each type of nucleotide base always pairs with just one other type of base, C with G and A with T. 8. Identify which is NOT a strong acid A) HNO$_{3}$. B) H$_{2}$SO$_{4}$. C) HI. D) H $ _ {2} $ co $ _ {3} $. Show Answer Correct Answer: D) H $ _ {2} $ co $ _ {3} $. 9. Select the name for the following acid:HBrO$_{3}$ A) Bromic acid. B) Bromous acid. C) Hydrobromic acid. D) None of the above. Show Answer Correct Answer: A) Bromic acid. 10. The word audio and audience contain which of the following latin roots that means to hear? A) Aqua. B) With. C) Bene. D) Aud. Show Answer Correct Answer: D) Aud. 11. What is the Latin root of the word dictator? A) One who rules. B) Dict. C) To say. D) Tor. Show Answer Correct Answer: B) Dict. 12. When an acid reacts with a base, what are the typical products? A) Salt and water. B) Acid and base. C) Hydrogen gas and salt. D) Oxygen and water. Show Answer Correct Answer: A) Salt and water. 13. What is the name of the reaction when there is an acid with a base? A) Analysis. B) Synthesis. C) Combustion. D) Neutralization. Show Answer Correct Answer: D) Neutralization. 14. What would happen to the blue and red litmus papers when they are dipped into a sample of acid rain? A) Blue litmus paper remains blue and red litmus paper remains red. B) Blue litmus paper turns red and red litmus paper turns blue. C) Blue litmus paper remains blue and red litmus paper turns blue. D) Blue litmus paper turns red and red litmus paper remains red. Show Answer Correct Answer: D) Blue litmus paper turns red and red litmus paper remains red. 15. Slippery texture A) Acid. B) Base. C) Neutral. D) None of the above. Show Answer Correct Answer: B) Base. 16. Which substance listed below is the most acidic ( strongest acid) A) Coffee= pH of 5. B) Orange juice = pH of 3. C) Ammonia = pH of 11. D) Bleach = pH of 13. Show Answer Correct Answer: B) Orange juice = pH of 3. 17. The following are true about DNA: A) Single helix, deoxyribose, GCAU. B) Single Helix, deoxyribose, cat. C) Double helix, ribose, GCAU. D) Double Helix, deoxyribose, cat. Show Answer Correct Answer: D) Double Helix, deoxyribose, cat. 18. Given that X$_{10 }$= 11$_{2 }$+ 11$_{5 }$+ 11$_{8, }$ find the value of X. A) 15. B) 16. C) 17. D) 18. Show Answer Correct Answer: D) 18. 19. H$^{+}$ + OH$^{-}$ $\rightarrow$ H$_{2}$O Is a chemical equation showing ..... A) A neutralisation reaction. B) An acid-metal reaction. C) An acid-carbonate reaction. D) None of the above. Show Answer Correct Answer: A) A neutralisation reaction. 20. The sugar in DNA is? A) Sucrose. B) Glucose. C) Dexoxyribose. D) Fructose. Show Answer Correct Answer: C) Dexoxyribose. 21. What type of bond holds the two strands of DNA together? A) Ionic bonds. B) Covalent bonds. C) Hydrogen bonds. D) Peptide bonds. Show Answer Correct Answer: C) Hydrogen bonds. 22. Which scientist contributed the majority of the work and research necessary for understanding the structure of DNA? A) Francis Crick. B) James Watson. C) Rosalind Franklin. D) None of the above. Show Answer Correct Answer: C) Rosalind Franklin. 23. Turns blue litmus red A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: A) True. 24. Which of the following statements is correct about the weak base, ammonia (NH$_{3}$)? A) It dissociates completely in water to produce a high concentration of hydroxide ions. B) It dissociates partially in water to produce a low concentration of hydrogen ions. C) It dissociates partially in water to produce a high concentration of hydroxide ions. D) It dissociates partially in water to produce a low concentration of hydroxide ions. Show Answer Correct Answer: D) It dissociates partially in water to produce a low concentration of hydroxide ions. 25. A strong base in a water solution A) Is a weak electrolyte. B) Produces many H$^{+}$ ions. C) Will not dissolve. D) Completely dissociates into ions. Show Answer Correct Answer: D) Completely dissociates into ions. ← 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