This quiz works best with JavaScript enabled. Home > Class 7 > Class 7 Science Chapter 4 Bases – Quiz 22 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 7 Science Chapter 4 Bases Quiz 22 (25 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. What does the Latin root contra/counter mean? A) To do. B) Shape. C) Strength. D) Against. Show Answer Correct Answer: D) Against. 2. What is the relational model? A) It is the one that consists of a set of one or more tables that is structured in records and fields that are related to each other. B) It is the one that consists of a set of one or more tables that are structured. C) It is the one that consists of a set of one or more tables that are structured with many. D) It is the one that consists of a set that relates to anyone. Show Answer Correct Answer: A) It is the one that consists of a set of one or more tables that is structured in records and fields that are related to each other. 3. Which is the best definition of a root word? A) An affix which is placed before the stem of a word. B) Word parts that come before or after the stem of a word. C) A basic word or word part upon which prefixes and suffixes can be added to make new words. D) An affix which is placed after the stem of a word. Show Answer Correct Answer: C) A basic word or word part upon which prefixes and suffixes can be added to make new words. 4. Astudenttookahalf-filledtesttubewithdilutehydrochloricacidandafewdropsof phenolphthaleininthesolution.Asheputafewdropsofsodiumhydroxideintothesolution, it turnstolightpink.Further, heputafewextradropsoftheacidandobservesthatthecolour disappears.Whatcausedthecolourtodisappearfromthesolution? A) Thevolumeofthesolutionincreased. B) Turningofthemixtureintoaneutralsolution. C) Decreaseintheamountofacidinthesolution. D) Anincreaseintheamountofbaseinthesolution. Show Answer Correct Answer: B) Turningofthemixtureintoaneutralsolution. 5. What is the formula of hydrosulfuric acid? A) H$_{2}$$_{}$S. B) H$_{2}$SO$_{4}$. C) HS. D) HSO $ _ {4} $. Show Answer Correct Answer: A) H$_{2}$$_{}$S. 6. Bases have a pH ..... A) Greater than 7. B) Lower than 7. C) Equal to 7. D) None of the above. Show Answer Correct Answer: A) Greater than 7. 7. What base pairs with guanine? A) Cytosine. B) Guanine. C) Thymine. D) Sugar. Show Answer Correct Answer: A) Cytosine. 8. The formula for hydrochloric acid is ..... A) HCl. B) H$_{2}$Cl. C) H$_{2}$SO$_{4}$. D) HSO $ _ {4} $. Show Answer Correct Answer: A) HCl. 9. What does the Latin root form mean? A) Water. B) Both. C) Shape. D) Square. Show Answer Correct Answer: C) Shape. 10. Given that 43$_{5 }$< x$_{10 }$< 34$_{8, }$which of the following is not a possible value of x? A) 25. B) 26. C) 27. D) 28. Show Answer Correct Answer: D) 28. 11. Determine whether the following substance is an acid or a base:Blood A) Acid. B) Base. C) All the above. D) None of the above. Show Answer Correct Answer: B) Base. 12. What is the Latin root of the word multimedia? A) Multiple. B) Media. C) Multi. D) Multiply. Show Answer Correct Answer: C) Multi. 13. If the pH of a solution is 5.6 the pOH is A) 6.5. B) 12.4. C) 8.4. D) 5.6. Show Answer Correct Answer: C) 8.4. 14. What is DNA made of? A) Sugar, Phosphate, nitrogen base. B) Phosphate, Adenine, nitrogen base. C) Thymine, Adenine, Cytomine. D) Phosphate, Nitrogen, Adenine. Show Answer Correct Answer: A) Sugar, Phosphate, nitrogen base. 15. The vehicle element within the databases is: A) Entity. B) Attribute. C) Valor. D) None of the above. Show Answer Correct Answer: A) Entity. 16. If a substance tastes sour it is known as A) Basic. B) Acidic. C) Neutral. D) None of these. Show Answer Correct Answer: B) Acidic. 17. Which of the following is NOT a property of ACIDS A) Tastes sour. B) Has a pH between 8 and 14. C) Feels sticky. D) Reacts with metals. Show Answer Correct Answer: B) Has a pH between 8 and 14. 18. Which nitrogen base is a purine? A) Cytosine. B) Thymine. C) Adenine. D) Uracil. Show Answer Correct Answer: C) Adenine. 19. Identify the cardinality of the statement:a person has only one nationality but the same nationality can be shared by several people. A) One by one. B) One to many. C) Many to many. D) None of the above. Show Answer Correct Answer: B) One to many. 20. They are the characteristics or properties of an entity. A) ATRIBUTO. B) ENTITY. C) RELATIONSHIP. D) NONE. Show Answer Correct Answer: A) ATRIBUTO. 21. Which of the following is a strong base? A) NH$_{3}$. B) Zn(OH)$_{2}$. C) HCl. D) CsOH. Show Answer Correct Answer: D) CsOH. 22. What type of arrow is used to express a weak acid? A) $\rightarrow$. B) < . C) <$\rightarrow$. D) None of these. Show Answer Correct Answer: C) <$\rightarrow$. 23. We can make natural indicators from these, except A) Turmeric. B) Hibiscus flower. C) Red cabbage. D) Water. Show Answer Correct Answer: D) Water. 24. When Sally tested an unknown solution, her red litmus paper turned blue, but her blue litmus paper remained blue. What does this indicate? A) Unknown is acidic. B) Unknown is alkaline. C) Unknown is neutral. D) Unknown can be acidic, alkaline or neutral. Show Answer Correct Answer: B) Unknown is alkaline. 25. Which of the following is a purine base in DNA? A) Adenine. B) Thymine. C) Cytosine. D) Uracil. Show Answer Correct Answer: A) Adenine. ← 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