This quiz works best with JavaScript enabled. Home > Cbse > Class 7 > Science > Bases > Class 7 Science Chapter 4 Bases – Quiz 1 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 7 Science Chapter 4 Bases Quiz 1 (60 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. What century is the year 2021? A) 21st century. B) 19th century. C) 20th century. D) 21st century. Show Answer Correct Answer: A) 21st century. 2. Which of the following is NOT a property of a base? A) Slippery to touch. B) Reacts with metals. C) Measures 8-14 on the pH scale. D) When mixed with an acid it becomes neutralized. Show Answer Correct Answer: B) Reacts with metals. 3. Solve for n:2$^{-2n}$ = 2$^{6}$ A) 5. B) -7. C) -1. D) -3. Show Answer Correct Answer: D) -3. 4. Which base is not found in DNA but is found in RNA? A) Guanine. B) Adenine. C) Uracil. D) Thymine. Show Answer Correct Answer: C) Uracil. 5. What is the effect of an alkali on red litmus paper? A) It has no effect on litmus paper. B) It turns red litmus paper blue. C) It turns blue litmus paper red. D) It causes the litmus paper to change color based on its concentration. Show Answer Correct Answer: B) It turns red litmus paper blue. 6. Which of the following latin roots means to write? A) Scrib/script. B) Mater. C) Spect. D) Bene. Show Answer Correct Answer: A) Scrib/script. 7. Which nitrogen base is replaced by uracil in RNA? A) Thymine. B) Cytosine. C) Adenine. D) Guanine. Show Answer Correct Answer: A) Thymine. 8. Paternity has to do with being a ..... A) Sister. B) Brother. C) Mother. D) Father. Show Answer Correct Answer: D) Father. 9. If there is excess hydroxide ions, the solution will be ..... A) Acidic. B) Basic. C) All the above. D) None of the above. Show Answer Correct Answer: B) Basic. 10. Which compound represents an base? A) NaOH. B) NaCl. C) CH$_{2}$OH. D) HCl. Show Answer Correct Answer: A) NaOH. 11. The effect of the following test solution on turmeric:-a) Vinegarb)Sugarc) soap A) A) Yellowb) Red c) Red. B) A) Yellowb) Red c) Yellow. C) A) Yellowb) Yellowc) Red. D) None of these. Show Answer Correct Answer: C) A) Yellowb) Yellowc) Red. 12. How many carbon atoms are there in a ribose and a deoxyribose sugar molecule? A) Three. B) Five. C) Eight. D) Six. Show Answer Correct Answer: B) Five. 13. Acids are neutralised by ..... A) Water. B) Hydrogen gas. C) Metals. D) Bases. Show Answer Correct Answer: D) Bases. 14. HBr is the conjugate acid of A) Br$^{1-}$. B) Br$_{2}$. C) H$_{2}$Br. D) None of the above. Show Answer Correct Answer: A) Br$^{1-}$. 15. Plaster of Paris Technical Formula ..... A) Case $ _ {4} $ 5 h $ _ {2} $ o. B) Case $ _ {4} $ 2 h $ _ {2} $ o. C) Case $ _ {4} $ 1/2 h $ _ {2} $ o. D) Case $ _ {4} $. Show Answer Correct Answer: C) Case $ _ {4} $ 1/2 h $ _ {2} $ o. 16. What is the correct name for the base with the formula $NaOH$ A) Sodium hydroxide. B) Sodium peroxide. C) Sodium hydride. D) Sodium oxide. Show Answer Correct Answer: A) Sodium hydroxide. 17. What type of salt can hydrochloric acid produce? A) Calcium hydrochloric. B) Calcium chloride. C) Calcium hydrochloride. D) Calcium nitrate. Show Answer Correct Answer: B) Calcium chloride. 18. What type of arrow is used to express a strong acid? A) $\rightarrow$. B) < . C) <$\rightarrow$. D) None of these. Show Answer Correct Answer: A) $\rightarrow$. 19. The pH range of less than 7 to 0 corresponds to substances with character: A) Acid. B) Redox. C) Salado. D) Basic. Show Answer Correct Answer: A) Acid. 20. What is the endpoint of a titration A) Where the amount of acid and base are equal as shown by a color change. B) Where there is no base. C) When the volume of base in the burette is used up. D) When there is no acid. Show Answer Correct Answer: A) Where the amount of acid and base are equal as shown by a color change. 21. We used pH strips as the indicators in our household acid and base substance test. We also talked about litmus papers as another type of indicator. What property changes on the pH strip or litmus paper to show if an substance is an acid or base? A) Color. B) Taste. C) Smell. D) Concentration. Show Answer Correct Answer: A) Color. 22. Solve. $5^{3-2x}=5^{-x}$ A) $3$. B) $-3$. C) $\frac{1}{3}$. D) $1$. Show Answer Correct Answer: A) $3$. 23. What is the Latin root of the word paternity? A) Father. B) Nity. C) Pater. D) Mother. Show Answer Correct Answer: C) Pater. 24. What is the Latin root of the word video? A) At. B) Video. C) Vis. D) Deo. Show Answer Correct Answer: A) At. 25. Two or more different elements chemically combine to form compounds. A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: A) True. 26. PH range for acidic substances A) 0-7. B) 7. C) 7-14. D) None of the above. Show Answer Correct Answer: A) 0-7. 27. Select the name for the following base:CaOH A) Calcium hydroxide. B) Calcium (I) hydroxide. C) All the above. D) None of the above. Show Answer Correct Answer: A) Calcium hydroxide. 28. What is the formula of magnesium oxide? A) MgO. B) Mg$_{2}$O$_{2}$. C) Mg$_{2}$O. D) MgO$_{2}$. Show Answer Correct Answer: A) MgO. 29. A scientist runs tests on an unknown substance. He finds that it is extremely corrosive. It produces H+ ions in solution. And, it has a pH of 1. What type of substance has he identified? A) Strong acid. B) Weak acid. C) Strong base. D) Weak base. Show Answer Correct Answer: A) Strong acid. 30. Select the name for the following acid:HNO$_{3}$ A) Nitric acid. B) Nitrous acid. C) Hydronitric acid. D) None of the above. Show Answer Correct Answer: A) Nitric acid. 31. What does the Latin root mit mean? A) Father. B) To write. C) To send. D) Mitten. Show Answer Correct Answer: C) To send. 32. What is the Latin root of the word percent? A) Percent. B) Cent. C) Per. D) One hundred. Show Answer Correct Answer: B) Cent. 33. When china rose indicator was added to lime water, what colour change will be detected? A) Reddish pink. B) Green. C) No colour change. D) Dark pink. Show Answer Correct Answer: B) Green. 34. The formula for sulfuric acid is ..... A) HCl. B) H$_{2}$Cl. C) HSO $ _ {4} $. D) H$_{2}$SO$_{4}$. Show Answer Correct Answer: D) H$_{2}$SO$_{4}$. 35. Antonino ate a drowned cake with a lot of Chile and lemon, minutes later it has a strong stomach pain He must: A) Take a soda to be removed. B) Take a cup of coffee since this is acidic and neutralizes the pH of the stomach. C) Take aluminum hydroxide because neutralizes the pH of the stomach. D) Take an aspirin (acetylsalicylic acid). Show Answer Correct Answer: C) Take aluminum hydroxide because neutralizes the pH of the stomach. 36. If the H$^{+}$ concentration of a solution is 2.8 x 10$^{-9}$, what is the pOH? A) 5.45. B) 8.55. C) 5. D) 9.00. Show Answer Correct Answer: A) 5.45. 37. Which of the following is a property of bases? A) Slippery feel. B) Sour taste. C) Turns red litmus paper blue. D) Reacts with metals to produce hydrogen gas. Show Answer Correct Answer: C) Turns red litmus paper blue. 38. Identify the cardinality of the statement:a customer can have different email accounts, but each email account belongs to a specific customer. 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. 39. A base is a substance A) That releases OH-ions when dissolved in water. B) That releases H+ ions when dissolved in water. C) Does not release any ions when dissolved in water. D) None of the above. Show Answer Correct Answer: A) That releases OH-ions when dissolved in water. 40. Which of the following are the four nitrogenous bases found in DNA? A) Adenine, Uracil, Cytosine, Guanine. B) Adenine, Thymine, Cytosine, Uracil. C) Adenine, Thymine, Guanine, Uracil. D) Adenine, Thymine, Cytosine, Guanine. Show Answer Correct Answer: D) Adenine, Thymine, Cytosine, Guanine. 41. Assertion (A):Salts are the products of an acid-base reaction. Reason (R):Salt may be acidic or basic. 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. 42. Select the formula for the following acid:phosphorous acid A) H$_{3}$PO$_{3}$. B) H$_{3}$PO$_{4}$. C) H$_{3}$P. D) None of the above. Show Answer Correct Answer: A) H$_{3}$PO$_{3}$. 43. When a metal carbonate reacts with an acid, what will the products always be? A) A salt, water and oxygen. B) A salt, water and carbon dioxide. C) Water and hydrogen. D) A salt and water. Show Answer Correct Answer: B) A salt, water and carbon dioxide. 44. When equal amounts of acid are mixed with a base they produce a solution with 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. 45. HC$_{2}$H$_{3}$O$_{2}$ + H$_{2}$O $\rightarrow$ H$_{3}$O$^{+}$ + C$_{2}$H$_{3}$O$_{2}$$^{1-}$HC$_{2}$H$_{3}$O$_{2 }$is acting as A) A conjugate base. B) A Bronsted Lowry base. C) A Bronsted Lowry acid. D) None of the above. Show Answer Correct Answer: C) A Bronsted Lowry acid. 46. Neutralization occurs when these react with acids forming a salt and water A) Acid. B) Base. C) Neutral. D) None of the above. Show Answer Correct Answer: B) Base. 47. Which is NOT true about indicators? A) They each have a certain pH where they change color. B) They come in a variety of colors. C) They are useful in titrations. D) They neutralize acids and bases. Show Answer Correct Answer: D) They neutralize acids and bases. 48. What does the Latin root mal mean? A) Bad. B) Around. C) Against. D) To send. Show Answer Correct Answer: A) Bad. 49. Arhenius:Any substance that in aqueous solution dissociates with hydrogen formation H $^{+} $ (protons) A) Base. B) Neutral. C) Acid. D) Animal. Show Answer Correct Answer: C) Acid. 50. Which one of these is a salt? A) Water. B) Sodium hydroxide. C) Sodium Chloride. D) Sulphuric acid. Show Answer Correct Answer: C) Sodium Chloride. 51. According to which theory is a base a substance which produces OH-ions in water? A) Arrhenius. B) Bronsted-Lowry. C) Lewis. D) None of the above. Show Answer Correct Answer: A) Arrhenius. 52. What is being donated/accepted between conjugate acid-base pairs? A) A neutron. B) Water. C) A hydroxide (OH-) ion. D) A hydrogen (H+) ion. Show Answer Correct Answer: D) A hydrogen (H+) ion. 53. Acid:substance that can accept electrons in the formation of bonds. A) TEORIA DE BRONSTED-LOWRY. B) TEORIA THE LEWIS. C) Acid-base neutralization. D) None of the above. Show Answer Correct Answer: B) TEORIA THE LEWIS. 54. Which of these formulas represents an acid? A) Highh. B) Cacl $ _ {2} $. C) H$_{2}$SO$_{4}$. D) Any otheruce. Show Answer Correct Answer: C) H$_{2}$SO$_{4}$. 55. Identify the cardinality of the statement:in an art contest, each participating artist has created a work and in turn each work has been created by a single artist. A) Uno a Uno. B) One to many. C) Many to many. D) None of the above. Show Answer Correct Answer: A) Uno a Uno. 56. A conductor of electricity A) Base. B) Acid. C) Both. D) Neither. Show Answer Correct Answer: C) Both. 57. Which of the following describes a dilute alkali? A) An alkali with a high amount of alkali dissolved in water. B) An alkali that is highly soluble in water. C) An alkali that produces a large number of hydroxyl ions. D) An alkali with a low amount of alkali dissolved in water. Show Answer Correct Answer: D) An alkali with a low amount of alkali dissolved in water. 58. Nitric acid produces ..... salts A) Carbonate. B) Nitrate. C) Chloride. D) Sulphate. Show Answer Correct Answer: B) Nitrate. 59. Consider the following statements:(a)Both acids and bases change colour of all indicators.(b) If an indicator gives a colour change with an acid, it does not give a change with a base.(c) If an indicator changes colour with a base, it does not change colour with an acid.(d) Change of colour in an acid and a base depends on the type of the indicator. Which of these statements are correct? A) All four. B) A and d. C) B, c and d. D) Only d. Show Answer Correct Answer: B) A and d. 60. The strength of an acid refers to its ability: A) To dissociate, or break down into its cation (positively charged ion) and anion (negatively charged ion), in water. B) To dissociate, or break down into its cation (positively charged ion), in water. C) To dissociate, or break down into its anion (negatively charged ion), in water. D) To not dissociate into its cation (positively charged ion) and anion (negatively charged ion), in water. Show Answer Correct Answer: A) To dissociate, or break down into its cation (positively charged ion) and anion (negatively charged ion), in water. Next →Related QuizzesScience QuizzesClass 7 QuizzesClass 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 9 🏠 Back to Homepage 📘 Download PDF Books 📕 Premium PDF Books