This quiz works best with JavaScript enabled. Home > Cbse > Class 7 > Science > Bases > Class 7 Science Chapter 4 Bases – Quiz 5 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 7 Science Chapter 4 Bases Quiz 5 (60 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. A students tests a substance using red litmus paper and phenolpthalein. The phenolpthalein stayed colorless while the red litmus paper turned violet. What kind of substance was being studied? A) Base solution. B) Acid solution. C) Salt solution. D) Neutral solution. Show Answer Correct Answer: D) Neutral solution. 2. Has a bitter taste and is slippery ..... A) Acid. B) Base. C) Soap. D) Neutral. Show Answer Correct Answer: B) Base. 3. The indicator bromthymol blue is added to a solution with a pH of 10 what color will it turn? A) Orange. B) Pink. C) Blue. D) Yellow. Show Answer Correct Answer: C) Blue. 4. This substance releases OH-into solution A) Acid. B) Base. C) Neutral. D) None of the above. Show Answer Correct Answer: B) Base. 5. Convert 123$_{4}$ to base 10? A) 18. B) 27. C) 123. D) 25. Show Answer Correct Answer: B) 27. 6. How many DNA molecules does replication start with, and end with? A) 10 $\rightarrow$ 20. B) 2 $\rightarrow$ 4. C) 1 $\rightarrow$ 2. D) 2 $\rightarrow$ 1. Show Answer Correct Answer: C) 1 $\rightarrow$ 2. 7. Which of the following solutions will turn orange if methyl orange is added to it? A) 1.0 M of HCl. B) .1 M of KCl. C) 10 M of LiOH. D) 1.0m of NaOH. Show Answer Correct Answer: A) 1.0 M of HCl. 8. Which of the following is an example of a substance that has a neutral pH? A) Lemon juice. B) Lysol. C) Vinegar. D) Water. Show Answer Correct Answer: D) Water. 9. Indicators are substances that help us ..... whether the the given solution is acidic or basic A) Find. B) Throw. C) Remove. D) Detect. Show Answer Correct Answer: D) Detect. 10. Which of the following latin roots means to throw? A) Ject. B) With. C) Jud. D) Aud. Show Answer Correct Answer: A) Ject. 11. NH$_{3}$ + H$_{2}$O $\rightarrow$ NH$_{4}$$^{+}$ + OH$^{-}$ NH$_{3}$ is a Bronsted Lowry A) Conjugate acid. B) Conjugate base. C) Acid. D) Base. Show Answer Correct Answer: D) Base. 12. When the pH of a solution changes from a pH of 8 to a pH of 9, the hydroxide ion concentration is? A) 0.1 of the original content. B) 0.01 of the original content. C) 10 times the original content. D) 100 times the original content. Show Answer Correct Answer: C) 10 times the original content. 13. Is the following compound 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. 14. If Lisa says the painting is spectacular, she means that it ..... beautiful. A) Sends. B) Looks. C) Sounds. D) Throws. Show Answer Correct Answer: B) Looks. 15. Special type of substances are used to test whether a substance is acidic or basic. A) Neutral. B) Indicators. C) Salt. D) All of them above. Show Answer Correct Answer: B) Indicators. 16. If one strand of DNA says GCT, the other strand says: A) CGA. B) GCT. C) CTA. D) TCG. Show Answer Correct Answer: A) CGA. 17. A very strong acid would have a pH of A) 9. B) 7. C) 1. D) 14. Show Answer Correct Answer: C) 1. 18. What are acidic? A) They are compounds that have oh $^{-} $. B) They are compounds that have h $^{+} $. C) They are compounds that have h $^{+} $ and pH greater than 7. D) Are composed of neutral pH. Show Answer Correct Answer: B) They are compounds that have h $^{+} $. 19. Which of these compounds is NOT an acid? A) H$_{2}$SO$_{4}$. B) HCl. C) CH$_{3}$COOH. D) H$_{2}$O. Show Answer Correct Answer: D) H$_{2}$O. 20. The root word form (from Latin) means "shape" and can stand by itself.What is the formula for success?In order to be accepted by others, some people conform to society.The suffix "-less" means "without." What does "formless" mean? A) Drawing a shape. B) The measure of a shape. C) Able to see shapes. D) Having no shape. Show Answer Correct Answer: D) Having no shape. 21. A weak alkali would have a pH of A) 14. B) 7. C) 8. D) 6. Show Answer Correct Answer: C) 8. 22. Pure water is ..... A) Acidic. B) Basic. C) Neutal. D) None of the above. Show Answer Correct Answer: C) Neutal. 23. What does the base 'A' pair with? A) C. B) G. C) A. D) T. Show Answer Correct Answer: D) T. 24. This structure contains the code for life A) DNA. B) Guanine. C) Uracil. D) Biomolecules. Show Answer Correct Answer: A) DNA. 25. What are the components of a DNA nucleotide? A) Deoxyribose, a phosphate and one of the bases:adenine, cytosine, guanine or thymine. B) Ribose, a phosphate and one of the bases:adenine, cytosine, guanine or uracil. C) Deoxyribose, a nitrate and one of the bases:adenine, cytosine, guanine or thymine. D) Ribose, a nitrate and one of the bases:adenine, cytosine, guanine or thymine. Show Answer Correct Answer: A) Deoxyribose, a phosphate and one of the bases:adenine, cytosine, guanine or thymine. 26. Name of the substances used to detect an acid or a base. A) Electrolytic. B) Catalysts. C) Indicators. D) None of the above. Show Answer Correct Answer: C) Indicators. 27. Sulphuric acid produces ..... salts A) Chloride. B) Carbonate. C) Nitrate. D) Sulphate. Show Answer Correct Answer: D) Sulphate. 28. The correct formula of calcium hydroxide is: A) K(OH)$_{2}$. B) Highh. C) KOH. D) Ca(OH)$_{2}$. Show Answer Correct Answer: D) Ca(OH)$_{2}$. 29. What holds the DNA bases together? A) Paired bases. B) Hydrogen bonds. C) Double Helix. D) DNA bases. Show Answer Correct Answer: B) Hydrogen bonds. 30. Which compound represents an acid? A) NaOH. B) HCl. C) CH$_{2}$OH. D) NaCl. Show Answer Correct Answer: B) HCl. 31. What is the value in base 10? $\left(101011\right)_2$ A) 34. B) 43. C) 86. D) 45. Show Answer Correct Answer: B) 43. 32. If a lamp emits light, that means it ..... light. A) Sends out. B) Hears. C) Throws. D) Sees. Show Answer Correct Answer: A) Sends out. 33. The letters of the DNA alphabet are: A) A, C, G and T. B) A, O, G, and T. C) C, G, P and T. D) C, G, T and D. Show Answer Correct Answer: A) A, C, G and T. 34. What is the formula of the ion produced when an acid is dissolved in water? A) H$^{+}$. B) H$_{2}$SO$_{4}$. C) HNO$_{3}$. D) HCl. Show Answer Correct Answer: A) H$^{+}$. 35. Rain water is slightly acidic. What is its pH? A) 7.0. B) 1.0. C) 5.6. D) 8.2. Show Answer Correct Answer: C) 5.6. 36. Guanine, cytosine, adenine, and thymine are A) Sides of the ladder in DNA. B) Phosphate molecules. C) Nitrogen bases. D) None of the above. Show Answer Correct Answer: C) Nitrogen bases. 37. What millennium is the year 1769 to? A) Iie millennium. B) 4th millennium. C) 1st year. D) III millennium. Show Answer Correct Answer: A) Iie millennium. 38. Reacts with phenolphthalein turning it magenta A) Acid. B) Base. C) Neutral. D) None of the above. Show Answer Correct Answer: B) Base. 39. Identify the cardinality of the statement:a patient can be treated by a single doctor when he goes consults, and in turn a doctor attends one or more patients. A) One by one. B) One to many. C) Many to many. D) None of the above. Show Answer Correct Answer: B) One to many. 40. Cytosine always pairs with A) Adenine. B) Thymine. C) Guanine. D) Uracil. Show Answer Correct Answer: C) Guanine. 41. The FULL NAME of the letter C from the DNA alphabet is: A) Cytosine. B) Cysteine. C) Calypsine. D) Cryosine. Show Answer Correct Answer: A) Cytosine. 42. What is the conjugate base of H$_{2}$SO$_{4}$? A) H$_{2}$SO$_{3}$. B) HSO $ _ {3} $$^{1-} $. C) SO$_{4}$$^{2-}$. D) HSO $ _ {4} $$^{1-} $. Show Answer Correct Answer: D) HSO $ _ {4} $$^{1-} $. 43. Which one of these substances will have a NEUTRAL pH? A) Lemon juice. B) Water. C) Coffee. D) Bleach. Show Answer Correct Answer: B) Water. 44. The root word port (from Latin) means "carry." These days, almost everyone has a portable phone.Transportation can take the form of plane, train or car travel. "Ex-" is a prefix that means "out" or "from." Which word means "to send out goods to be sold in another country" ? A) Exist. B) Extend. C) Exclude. D) Export. Show Answer Correct Answer: D) Export. 45. What is the role of DNA polymerase during DNA replication? A) Unzips the DNA strands. B) Adds nucleotides to the growing DNA strand. C) Joins Okazaki fragments. D) Synthesizes RNA primers. Show Answer Correct Answer: B) Adds nucleotides to the growing DNA strand. 46. A pH of 7 is a(n) ..... ? A) Litmus paper. B) Acid. C) Neutral. D) Base. Show Answer Correct Answer: C) Neutral. 47. What is the meaning of complementary base paring, in DNA structure? A) Nucleotide bases always exist in the same proportions in a DNA molecule. B) Each type of base always pairs with one other type, C with T and A with G. C) This is the idea that nucleotide bases always pair with nucleotide bases. D) Each type of nucleotide base always pairs with just one other type of base, C with G and A with T. Show Answer Correct Answer: D) Each type of nucleotide base always pairs with just one other type of base, C with G and A with T. 48. Identify which is NOT a strong acid A) HNO$_{3}$. B) H$_{2}$SO$_{4}$. C) H $ _ {2} $ co $ _ {3} $. D) HI. Show Answer Correct Answer: C) H $ _ {2} $ co $ _ {3} $. 49. Select the name for the following acid:HBrO$_{3}$ A) Bromic acid. B) Bromous acid. C) Hydrobromic acid. D) None of the above. Show Answer Correct Answer: A) Bromic acid. 50. The word audio and audience contain which of the following latin roots that means to hear? A) With. B) Aqua. C) Aud. D) Bene. Show Answer Correct Answer: C) Aud. 51. What is the Latin root of the word dictator? A) To say. B) One who rules. C) Tor. D) Dict. Show Answer Correct Answer: D) Dict. 52. 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. 53. What is the name of the reaction when there is an acid with a base? A) Synthesis. B) Combustion. C) Neutralization. D) Analysis. Show Answer Correct Answer: C) Neutralization. 54. 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. 55. Slippery texture A) Acid. B) Base. C) Neutral. D) None of the above. Show Answer Correct Answer: B) Base. 56. Which substance listed below is the most acidic ( strongest acid) A) Orange juice = pH of 3. B) Ammonia = pH of 11. C) Coffee= pH of 5. D) Bleach = pH of 13. Show Answer Correct Answer: A) Orange juice = pH of 3. 57. 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. 58. Given that X$_{10 }$= 11$_{2 }$+ 11$_{5 }$+ 11$_{8, }$ find the value of X. A) 18. B) 15. C) 16. D) 17. Show Answer Correct Answer: A) 18. 59. 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. 60. The sugar in DNA is? A) Sucrose. B) Glucose. C) Fructose. D) Dexoxyribose. Show Answer Correct Answer: D) Dexoxyribose. ← PreviousNext →Related QuizzesScience QuizzesClass 7 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 6Class 7 Science Chapter 4 Bases Quiz 7Class 7 Science Chapter 4 Bases Quiz 8Class 7 Science Chapter 4 Bases Quiz 9 🏠 Back to Homepage 📘 Download PDF Books 📕 Premium PDF Books