This quiz works best with JavaScript enabled. Home > Cbse > Class 7 > Science > Bases > Class 7 Science Chapter 4 Bases – Quiz 4 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 7 Science Chapter 4 Bases Quiz 4 (60 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. Which shows the correct complementary base pairing for DNA? A) C-A, T-G. B) T-A, G-C. C) C-G, U-A. D) A-G, C-T. Show Answer Correct Answer: B) T-A, G-C. 2. Which of the following substances is most likely to be acidic? A) Soap. B) Baking soda. C) Ammonia. D) Vinegar. Show Answer Correct Answer: D) Vinegar. 3. Select the name for the following acid:HC$_{2}$H$_{3}$O$_{2}$ A) Acenous acid. B) Ethanoic acid. C) Hydroacetic acid. D) Acetic acid. Show Answer Correct Answer: D) Acetic acid. 4. Given that 4x5$^{3 }$+ 2x5$^{2 }$+ 5y = 4230$_{5, }$find the value of y. A) 6. B) 2. C) 0. D) 3. Show Answer Correct Answer: D) 3. 5. After studying acids and bases you notice something in your kitchen has a bitter taste and is slippery to the touch. Since you don't have pH strips to test this substance you can use the properties to make an educated guess that this substance is ..... A) A base. B) A salt. C) An acid. D) A hydrate. Show Answer Correct Answer: A) A base. 6. What base pairs with cytosine? A) Thymine. B) Adenine. C) Magazine. D) Guanine. Show Answer Correct Answer: D) Guanine. 7. A compound that breaks apart in water, producing charged particles (ions) that can conduct electricity. Is called a ..... A) Electrolyte. B) Acid. C) Base. D) Litmus Paper. Show Answer Correct Answer: A) Electrolyte. 8. Examples:baking soda, drain cleaner, Tums A) Acid. B) Base. C) Neutral. D) None of the above. Show Answer Correct Answer: B) Base. 9. Which of these alkalis is commonly used in household cleaners? A) Calcium hydroxide (Ca(OH)2). B) Ammonium hydroxide (NH4OH). C) Ferric hydroxide (Fe(OH)3). D) Sodium hydroxide (NaOH). Show Answer Correct Answer: D) Sodium hydroxide (NaOH). 10. When a strong acid and base are mixed, neutralization occurs. A) TEORIA DE BRONSTED-LOWRY. B) N.A. C) Deid-base titration or neutralization. D) TEORIA THE LEWIS. Show Answer Correct Answer: C) Deid-base titration or neutralization. 11. In a DNA double helix, the two strands are held together by what type of bond? A) Ionic bonds. B) Covalent bonds. C) Hydrogen bonds. D) Metallic bonds. Show Answer Correct Answer: C) Hydrogen bonds. 12. Which nitrogen base is not found in RNA? A) Uracil. B) Adenine. C) Thymine. D) Cytosine. Show Answer Correct Answer: C) Thymine. 13. Which Greek base means "water" ? A) Phon. B) Graph. C) Hydr. D) Photo. Show Answer Correct Answer: C) Hydr. 14. To test a solution in container 'A.' You dipped the filter paper in this solution and then in lime water. The colour of filter paper after dipping in lime water becomes brownish red. It shows that the solution in container 'A' was: A) Turmeric solution. B) Methyl red solution. C) Phenolphthalein solution. D) Red litmus solution. Show Answer Correct Answer: A) Turmeric solution. 15. In a neutralization reaction between an acid and a base, what are the typical products? A) Water and salt. B) Hydrogen gas and salt. C) Carbon dioxide and water. D) Oxygen and salt. Show Answer Correct Answer: A) Water and salt. 16. Which of the following latin roots means to send? A) With. B) Aud. C) Ject. D) Port. Show Answer Correct Answer: A) With. 17. Which of the following latin roots means bad? A) Bene. B) Mater. C) Pater. D) Mal. Show Answer Correct Answer: D) Mal. 18. What are the three components of a nucleotide? A) Sugar, phosphate, nitrogen base. B) Sugar, phosphate, protein. C) Sugar, hydrogen, nitrogen base. D) Sugar, oxygen, nitrogen base. Show Answer Correct Answer: A) Sugar, phosphate, nitrogen base. 19. Does acids dissolve in water? A) Yes. B) No. C) All the above. D) None of the above. Show Answer Correct Answer: A) Yes. 20. What are the formulas for the following? ..... sulfuric acid ..... nitric acid ..... A) H $ _ {2} $ so, ENT. B) H $ _ {2} $ so $ _ {4} $, hno $ _ {3} $. C) H $ _ {2} $ so $ _ {3} $, hno $ _ {3} $. D) H$_{2}$S, H$_{3}$N. Show Answer Correct Answer: B) H $ _ {2} $ so $ _ {4} $, hno $ _ {3} $. 21. Astudenthasfoursolutionsamongwhichoneisacidicinnature.Shewantstoidentifytheacidic solutionusingalitmuspaper.Whichoftheseobservationswouldhelpidentifytheacidicsolution? A) Placeblue litmusinthesolutionandseeifitturnswhite. B) Placeredlitmusinthesolutionandseeifitturnswhite. C) Placeblue litmusinthesolutionandseeifitturnsred. D) Placeredlit Musinthesolution. Show Answer Correct Answer: C) Placeblue litmusinthesolutionandseeifitturnsred. 22. According to the alternate acid base theory, a compound is a base if it A) Accepts a hydrogen ion. B) Donates a hydroxide ion. C) Donates a hydrogen ion. D) Accepts a hydroxide ion. Show Answer Correct Answer: A) Accepts a hydrogen ion. 23. Bases will turn litmus paper ..... , while acids will turn litmus paper ..... A) Colourless pink. B) Blue red. C) Pink colourless. D) Red blue. Show Answer Correct Answer: B) Blue red. 24. All acids begin with A) He$^{+}$. B) OH-. C) H$^{+}$. D) Hydro. Show Answer Correct Answer: C) H$^{+}$. 25. Acid:Substance that in dissolution releases or yields protons. A) N.A. B) Acid reactions. C) TEORIA DE BRONSTED-LOWRY. D) Arrhenius Theory. Show Answer Correct Answer: C) TEORIA DE BRONSTED-LOWRY. 26. According to Arrhenius, what is the definition of an ACID? A) A substance that contains hydroxide and ionizes to produce OH-. B) A substance that contains hydrogen and ionizes to produce H+. C) A substance that contains hydrogen and ionizes to produce OH-. D) A substance that contains hydroxide and ionizes to produce H+. Show Answer Correct Answer: B) A substance that contains hydrogen and ionizes to produce H+. 27. What is there more of in solution with a strong acid? A) Reactants. B) Products. C) Both are equal. D) Neither. Show Answer Correct Answer: B) Products. 28. Which represents a hydroxide ion? A) That $^{+} $. B) Cl$^{-}$. C) H$^{+}$. D) OH$^{-}$. Show Answer Correct Answer: D) OH$^{-}$. 29. Each strand of a DNA molecule contains nitrogenous bases that pair with other nitrogenous bases in very specific ways. A diagram of a section of DNA is shown. A) ATO TCG ACG CGC A. B) 5'tgt atc tgc gc t. C) 5'agu CGU CGU appearance. D) TCG CGC AGC TAC A. Show Answer Correct Answer: A) ATO TCG ACG CGC A. 30. There are 2 types of acids and bases A) Strong and weak. B) Strong and basic. C) Sour and bitter. D) Light and blue. Show Answer Correct Answer: A) Strong and weak. 31. According to this theory, an acid-base reaction generates a new acid and a new base, which are called conjugates. A) N.A. B) Arrhenius Theory. C) TEORIA DE BRONSTED-LOWRY. D) BASES. Show Answer Correct Answer: C) TEORIA DE BRONSTED-LOWRY. 32. Is this a neutralization reaction? A) YES. B) NO. C) All the above. D) None of the above. Show Answer Correct Answer: A) YES. 33. Red litmus paper tuns blue whenever reacting with a ..... ? A) Acid. B) Neutral. C) Cheez-it. D) Base. Show Answer Correct Answer: D) Base. 34. A pH and a pOH will add up to: A) 1.0 x 10$^{-14}$. B) 0. C) 14. D) 7. Show Answer Correct Answer: C) 14. 35. What is the subunit of DNA? A) Polysaachride. B) Polypeptide. C) Nucleotide. D) None of the above. Show Answer Correct Answer: C) Nucleotide. 36. The root spect means A) To write. B) To carry. C) To say. D) To look. Show Answer Correct Answer: D) To look. 37. If a DNA sequence it GAATGCCT, what are the matching base pairs? A) ACGTACCTG. B) AEIOU and sometimes Y. C) Cttacgga. D) GCCTATGC. Show Answer Correct Answer: C) Cttacgga. 38. According to Bronsted-Lowry, what is the definition of an BASE? A) A substance that donates a hydroxide (OH-) ion. B) A substance that accepts a hydroxide (OH-) ion. C) A substance that donates a hydrogen (H+) ion. D) A substance that accepts a hydrogen (H+) ion. Show Answer Correct Answer: D) A substance that accepts a hydrogen (H+) ion. 39. Base:substance that in solution releases oxidrile ions (Oh $^{-1} $) it contains. A) N.A. B) TEORIA DE BRONSTED-LOWRY. C) Arrhenius Theory. D) Acid reactions. Show Answer Correct Answer: C) Arrhenius Theory. 40. What is the meaning of the Greek base phon? A) Movement or motion. B) Light or brightness. C) Sound or voice. D) Silence or quiet. Show Answer Correct Answer: C) Sound or voice. 41. What is the formula of carbon dioxide? A) CO$_{2}$. B) NH$_{3}$. C) H$_{2}$. D) H$_{2}$O. Show Answer Correct Answer: A) CO$_{2}$. 42. Water can act as an acid or a base, so it is called substance ..... A) Phenolphthalein. B) Neutralized. C) N.A. D) Amphotera. Show Answer Correct Answer: D) Amphotera. 43. Which of the following is an example of a base but not an alkali? A) Ferric hydroxide (Fe(OH)3). B) Sodium hydroxide (NaOH). C) Calcium hydroxide (Ca(OH)2). D) Potassium hydroxide (KOH). Show Answer Correct Answer: A) Ferric hydroxide (Fe(OH)3). 44. A process in which DNA has the unique ability to make an exact copy of itself. A) Transcription. B) Protein Synthesis. C) Replication. D) Translation. Show Answer Correct Answer: C) Replication. 45. Bases release ..... A) Hydrogen ions. B) Hydrogen gas. C) Hydroxide ions. D) Sodium ions. Show Answer Correct Answer: C) Hydroxide ions. 46. Nitric acid turn red litmus blue A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: A) True. 47. When the pH of a solution changes from a pH of 9 to a pH of 7, the hydrogen ion concentration is? A) 100 times the original content. B) 10 times the original content. C) 0.1 of the original content. D) 0.01 of the original content. Show Answer Correct Answer: A) 100 times the original content. 48. Water has a pH ..... A) Greater than 7. B) Lower than 7. C) Equal to 7. D) None of the above. Show Answer Correct Answer: C) Equal to 7. 49. True or False:DNA is found in ALL organisms A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: A) True. 50. Nucleotides are: A) Monomers of DNA. B) Monomers of proteins. C) DNA base pairs. D) Polymers of RNA. Show Answer Correct Answer: A) Monomers of DNA. 51. If a strand of DNA has 39% Cytosine, it has ..... A) 39% Adenine. B) 39% Guanine. C) 39% Thymine. D) 39% combined Cytosine and Guanine. Show Answer Correct Answer: B) 39% Guanine. 52. Each row of a table is a????????? A) Given. B) Campo. C) Tabla. D) Record. Show Answer Correct Answer: D) Record. 53. T A G G A C T The complementary strand is ..... A) A T C C T G A. B) T A G G A C T. C) T T C C A G T. D) A T G G T G A. Show Answer Correct Answer: A) A T C C T G A. 54. What type of arrow is used to express a weak base? A) $\rightarrow$. B) < . C) <$\rightarrow$. D) None of these. Show Answer Correct Answer: C) <$\rightarrow$. 55. A pH of 1-6 is a(n) ..... ? A) Acid. B) Neutral. C) Spaghetti. D) Base. Show Answer Correct Answer: A) Acid. 56. What is the name of the liquid used for car batteries? A) Hydrochloric acid. B) H2SO4. C) Phosphoric acid. D) HCL. Show Answer Correct Answer: B) H2SO4. 57. Solve 7$^{3x+2}$ = 7$^{x-8}$ A) 2. B) -4. C) -5. D) -3. Show Answer Correct Answer: C) -5. 58. CsOH is classified as a: A) Strong acid. B) Weak base. C) Weak acid. D) Strong base. Show Answer Correct Answer: D) Strong base. 59. Assertion (A):Neutralization reaction is accompanied by evolution of heat. Reason (R):Neutralization reaction is a reaction between an acid and a base to form salt and water. A) Both A and R are true and R is the correct explanation of A. B) Both A and R are true but R is not the correct explanation of A. C) A is true but R is false. D) A is false but R is true. Show Answer Correct Answer: B) Both A and R are true but R is not the correct explanation of A. 60. In a ..... reaction, an acid and a base produce a salt and a water. A) Decomposition. B) Neutralization. C) Concentrated. D) Dilute. Show Answer Correct Answer: B) Neutralization. ← 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 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 9 🏠 Back to Homepage 📘 Download PDF Books 📕 Premium PDF Books