This quiz works best with JavaScript enabled. Home > Cbse > Class 7 > Science > Bases > Class 7 Science Chapter 4 Bases – Quiz 7 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 7 Science Chapter 4 Bases Quiz 7 (60 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. Which of the following household items is most likely to be acidic? A) Baking soda. B) Vinegar. C) Soap. D) Ammonia. Show Answer Correct Answer: B) Vinegar. 2. Read the given statements and select the correct option.Statement 1:Baking soda does not taste sour.Statement 2:Bases are sour in taste while acids are bitter in taste. A) Both statements 1 and 2 are true and statement 2 is the correct explanation of statement 1. B) Both statements 1 and 2 are true but statement 2 is not the correct explanation of statement 1. C) Statement 1 is true and statement 2 is false. D) Both statements 1 and 2 are false. Show Answer Correct Answer: C) Statement 1 is true and statement 2 is false. 3. A(n) ..... is a substance that produces hydronium ions in solution. A) Base. B) Salt. C) Acid. D) Indicator. Show Answer Correct Answer: C) Acid. 4. Which experiment helped identify the role of nitrogen bases in DNA? A) Avery-MacLeod-McCarty experiment. B) Meselson-Stahl experiment. C) Hershey-Chase experiment. D) Watson-Crick model. Show Answer Correct Answer: D) Watson-Crick model. 5. What PH number would be an example of a mild acid? A) 2. B) 5. C) 1. D) 9. Show Answer Correct Answer: B) 5. 6. The word paternity contains which of the following latin roots that means father? A) With. B) Spect. C) Pater. D) Mater. Show Answer Correct Answer: C) Pater. 7. Methyl orange is a substance that only identifies ..... changing from orange to red. A) Sales. B) Bases. C) Acids. D) None of the above. Show Answer Correct Answer: C) Acids. 8. The FULL NAME of the letter A from the DNA alphabet is: A) Arginine. B) Albertine. C) Augmented. D) Adenine. Show Answer Correct Answer: D) Adenine. 9. What is a DNA molecule made of? A) Base, sugar, phosphate. B) Base, roof, height. C) DNA, sugar, phosphate. D) Base, sugar, coffee. Show Answer Correct Answer: A) Base, sugar, phosphate. 10. A substance that tastes sour A) Base. B) Acid. C) Neutral. D) None of the above. Show Answer Correct Answer: B) Acid. 11. Which side of the equilibrium reaction is favored for a weak base? A) Product side. B) Neither side. C) Reactant side. D) None of the above. Show Answer Correct Answer: C) Reactant side. 12. The FULL NAME of the letter G from the DNA alphabet is: A) Guavine. B) Guanine. C) Grapnel. D) Glycine. Show Answer Correct Answer: B) Guanine. 13. Solve for x using the same base method.(-3)$^{x}$ = (-3)$^{13}$ A) -3. B) 13. C) X + 13. D) X-13. Show Answer Correct Answer: B) 13. 14. Which of the following substances is commonly used to neutralize stomach acid? A) Salt. B) Lemon juice. C) Vinegar. D) Baking soda. Show Answer Correct Answer: D) Baking soda. 15. What is the pH of a 1 x 10$^{-8}$ M solution of HNO$_{3}$? A) 7.5. B) 6. C) 7. D) 8. Show Answer Correct Answer: D) 8. 16. The word aquarium contains the root AQUA which means A) Bad. B) One hundred. C) To hear. D) Water. Show Answer Correct Answer: D) Water. 17. Indigestion and heartburn is causes by an over production of stomach acid. If you were suffering from indigestion, what types of foods should you avoid? A) Foods that have a pH BELOW 7. B) Food that have a pH ABOVE 7. C) Food that have a pH of 7. D) Food has no impact on indigestion. Show Answer Correct Answer: A) Foods that have a pH BELOW 7. 18. Identify the salt in the following equation:Zn(OH)$_{2}$ + HNO$_{3}$ $\rightarrow$ H$_{2}$O + Zn(NO$_{3}$)$_{2}$ A) HNO$_{3}$. B) Zn(OH)$_{2}$. C) Zn(NO$_{3}$)$_{2}$. D) H$_{2}$O. Show Answer Correct Answer: C) Zn(NO$_{3}$)$_{2}$. 19. What are the 4 nitrogen bases found in DNA? A) Adenine, thymine, cytoplasm, and guanine. B) Adenine, thymine cytosine, and guanine. C) Adenine, thymine, cytosine, and gylcerol. D) Adenine, thymine, cytosine, and glucose. Show Answer Correct Answer: B) Adenine, thymine cytosine, and guanine. 20. What is the chemical formula for barium hydroxide? A) $ Ba (oh) _2 $. B) $BaO$. C) $ Ba_2o_3 $. D) $BaH_2$. Show Answer Correct Answer: A) $ Ba (oh) _2 $. 21. A solution has a pH of 7.0. What would happen to the pH if H ions were added? A) PH would go up. B) PH would go down. C) PH would stay the same. D) None of these. Show Answer Correct Answer: B) PH would go down. 22. What is the complementary base pairing rule in DNA? A) A pairs with U, C pairs with G. B) A pairs with T, C pairs with G. C) A pairs with C, T pairs with G. D) A pairs with G, T pairs with C. Show Answer Correct Answer: B) A pairs with T, C pairs with G. 23. Sodium Hydroxide turns blue litmus red A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: A) True. 24. Base:substance that in solution accepts protons (H $^{+1} $). A) Arrhenius Theory. B) Acid reactions. C) TEORIA DE BRONSTED-LOWRY. D) N.A. Show Answer Correct Answer: C) TEORIA DE BRONSTED-LOWRY. 25. From the below options, which one is not an olfactory indicator? A) Clove oil. B) Vanilla. C) Onion. D) Lichen. Show Answer Correct Answer: D) Lichen. 26. What describes HPO$_{4}$$^{2-}$? A) Amphiprotic but not amphoteric. B) Amphoteric but not amphiprotic. C) Amphiprotic and amphoteric. D) Neither amphiprotic nor amphoteric. Show Answer Correct Answer: C) Amphiprotic and amphoteric. 27. Which of the following is a purine nitrogen base? A) Cytosine. B) Adenine. C) Thymine. D) Uracil. Show Answer Correct Answer: B) Adenine. 28. From the following software, which is not a database manager? A) Oracle. B) MySQL. C) Libre Office Access. D) Libre Office Base. Show Answer Correct Answer: C) Libre Office Access. 29. Which of the following is found in apple? A) Oxalic acid. B) Lactic acid. C) Folic acid. D) Malic acid. Show Answer Correct Answer: D) Malic acid. 30. Which of the following household items is most likely to be a base? A) Lemon juice. B) Baking soda. C) Milk. D) Vinegar. Show Answer Correct Answer: B) Baking soda. 31. Which phrase describes a molecule of NH$_{3}$, in terms of molecular polarity and distribution of charge A) Polar with a symmetrical distribution of charge. B) Nonpolar with an asymmetrical distribution of charge. C) Polar with an asymmetrical distribution of charge. D) Nonpolar with a symmetrical distribution of charge. Show Answer Correct Answer: C) Polar with an asymmetrical distribution of charge. 32. Which substance reacts with certain metals to produce gaseous $H_2$ A) Acids. B) Bases. C) All the above. D) None of the above. Show Answer Correct Answer: A) Acids. 33. What is the complementary base pair for cytosine in DNA? A) Guanine. B) Thymine. C) Adenine. D) Uracil. Show Answer Correct Answer: A) Guanine. 34. The word portable contains a latin root that means A) To carry. B) To write. C) To hear. D) To send. Show Answer Correct Answer: A) To carry. 35. Oxalic acid is present in which of the given substances A) Spinach. B) Curd. C) Ant's sting. D) Milk. Show Answer Correct Answer: A) Spinach. 36. When few drops of phenolphthalein are added to sample 'A' it turned pink. To this pink coloured solution we added a few drops of sample 'B'. With continuous stirring the pink colour disappears. Samples 'A' and 'B' are: A) Sample 'A' is acidic and sample 'B' is basic. B) Sample 'A' is basic and sample 'B' is acidic. C) Sample 'A' is basic and sample 'B' is neutral. D) Sample 'A' is acidic and sample 'B' is neutral. Show Answer Correct Answer: B) Sample 'A' is basic and sample 'B' is acidic. 37. Scale that ranges from 1-14 A) Acid. B) Base. C) Salt. D) PH. Show Answer Correct Answer: D) PH. 38. Select the formula for the following acid:perchloric acid A) Hclo $ _ {2} $. B) HCl. C) HCLO $ _ {3} $. D) Hclo $ _ {4} $. Show Answer Correct Answer: D) Hclo $ _ {4} $. 39. The roots ped and pod (from Greek) mean "foot." Pedaling for hours on your bike might make your feet hurt.A podiatrist is a doctor who'll make your feet feel better. "Quad" is a root that means "four or fourth." Which word means "an animal that has four feet" ? A) Square. B) Quadrangle. C) Quatraine. D) Quadruped. Show Answer Correct Answer: D) Quadruped. 40. What is considered to be in the middle of the pH scale A) Basic. B) Indicator. C) Acidic. D) Neutral. Show Answer Correct Answer: D) Neutral. 41. What are the 4 nitrogen bases? A) Adenine, thymine, cytoplasm, and guanine. B) Adenine, thymine cytosine, and guanine. C) Adenine, thymine, cytosine, and gylcerol. D) Adenine, thymine, cytosine, and glucose. Show Answer Correct Answer: B) Adenine, thymine cytosine, and guanine. 42. If 30% of an individuals DNA is composed of C's, what percentage contains G's? A) 40%. B) 30%. C) 35%. D) 70%. Show Answer Correct Answer: B) 30%. 43. What is the meaning of the Greek base 'hydr'? A) Light. B) Sound. C) Earth. D) Water. Show Answer Correct Answer: D) Water. 44. Arrhenius:Any substance that in aqueous solution is dissocia with hydroxyl ion formation oh $^{-} $ A) Base. B) Neutral. C) Acid. D) Animal. Show Answer Correct Answer: A) Base. 45. Solve for x:2$^{x+6}$=2$^{5}$ A) 1. B) -1. C) -11. D) 11. Show Answer Correct Answer: B) -1. 46. The word equation for an acid reacting with a metal is A) Acid + metal $\rightarrow$. B) Acid + base $\rightarrow$. C) Acid + metal $\rightarrow$. D) Acid + metal $\rightarrow$. Show Answer Correct Answer: A) Acid + metal $\rightarrow$. 47. Say the name of this HCl compound A) Chlorine hydroxide. B) Carbon hydroxide. C) Hydrochloric acid. D) Iron hydroxide. Show Answer Correct Answer: C) Hydrochloric acid. 48. What does the Latin root aud mean? A) Against. B) To lead. C) To hear. D) One hundered. Show Answer Correct Answer: C) To hear. 49. Which one of the following is NOT a property of basic solutions? A) Conducts electricity. B) Feels soapy/slippery. C) Turns red litmus paper blue. D) Tastes sour. Show Answer Correct Answer: D) Tastes sour. 50. What is the formula of aqueous ammonia? A) NaOH. B) NH$_{3 }$(aq). C) KOH. D) Ca (oh) $ _ {2} $. Show Answer Correct Answer: B) NH$_{3 }$(aq). 51. Which phrase describes a molecule of Br$_{2}$, in terms of molecular polarity and distribution of charge A) Nonpolar with a symmetrical distribution of charge. B) Polar with an asymmetrical distribution of charge. C) Polar with a symmetrical distribution of charge. D) Nonpolar with an asymmetrical distribution of charge. Show Answer Correct Answer: C) Polar with a symmetrical distribution of charge. 52. What is the correct name for the base with the formula $LiOH$ A) Lithium hydride. B) Lithium hydroxide. C) Lithium carbonate. D) Lithium oxide. Show Answer Correct Answer: B) Lithium hydroxide. 53. An entity in the entity-refusal is represented with: A) No se de que habla. B) A rectangle. C) A oval. D) An entity. Show Answer Correct Answer: B) A rectangle. 54. A carbonate reacts with an acid to form what gas? A) Oxygen. B) Hydrogen. C) Carbon dioxide. D) Air. Show Answer Correct Answer: C) Carbon dioxide. 55. Name of one of the neutralization products A) Oxygen. B) Sales. C) Hydracy. D) None. Show Answer Correct Answer: B) Sales. 56. Sustainment that releases hydrogen ions when dissolving in water A) Base. B) Sal. C) Metal. D) Acid. Show Answer Correct Answer: D) Acid. 57. What does biography mean? A) Spending a lifetime writing. B) A story told with illustrations and photographs. C) A written story about a person's life. D) Something written in two sections. Show Answer Correct Answer: C) A written story about a person's life. 58. What is the DNA compliment of this sequence?GCAATCA A) Cgttgt. B) CGTTTA. C) Cgaaat. D) None of the above. Show Answer Correct Answer: A) Cgttgt. 59. What millennium is the year-300 the year? A) -Ier millennium. B) -Ave millennium. C) -millennium. D) -millennium. Show Answer Correct Answer: A) -Ier millennium. 60. Select the name for the following base:Cu(OH)$_{2}$ A) Copper (I) hydroxide. B) Copper (II) hydroxide. C) Copper (I) hydride. D) Copper (II) hydride. Show Answer Correct Answer: B) Copper (II) hydroxide. ← 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 5Class 7 Science Chapter 4 Bases Quiz 6Class 7 Science Chapter 4 Bases Quiz 8Class 7 Science Chapter 4 Bases Quiz 9 🏠 Back to Homepage 📘 Download PDF Books 📕 Premium PDF Books