This quiz works best with JavaScript enabled. Home > Class 7 > Class 7 Science Chapter 4 Bases – Quiz 8 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 7 Science Chapter 4 Bases Quiz 8 (25 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. If you have a solution that is very acidic with a pH of 3.5, what can you do to raise the pH of the solution? A) Add an acid. B) Add more water. C) Increase the temperature. D) Add a base. Show Answer Correct Answer: D) Add a base. 2. Which of the following is a common use of bases in everyday life? A) Used in baking as baking soda. B) Used in car batteries. C) Used to preserve food. D) Used in vinegar. Show Answer Correct Answer: A) Used in baking as baking soda. 3. What are the four nitrogen bases found in RNA? A) Adenine, thymine, cytosine, and guanine. B) Adenine, uracil, cytosine, and guanine. C) Adenine, uracil, cytosine, and glucose. D) Adenine, thymine, cytosine, and uracil. Show Answer Correct Answer: B) Adenine, uracil, cytosine, and guanine. 4. If a solution is acidic, and you are using the indicator methyl orange, what color would you see? A) Yellow green. B) Reddish pink. C) Blue. D) Orange. Show Answer Correct Answer: B) Reddish pink. 5. If you were testing what might affect the rate of dissolving of sugar, you could test the affect of agitation (shaking, stirring, etc). Which of the following BEST explains how this will change how fast the solute will dissolve. A) Stirring the solution exposes the solute to fresh solvent more quickly. B) Stirring helps more solvent evaporate. C) Stirring causes more ions to precipitate out of solution. D) Stirring equalizes the water temperature. Show Answer Correct Answer: A) Stirring the solution exposes the solute to fresh solvent more quickly. 6. Which pH represents the solution with the highest Hydrogen ion concentration A) PH=1. B) PH=3. C) PH=7. D) PH=11. Show Answer Correct Answer: A) PH=1. 7. What is the molarity of a 30 mL HCl which is neutralized by 48 mL of 0.1 M NaOH?HCl + NaOH $\rightarrow$ H$_{2}$O + NaCl A) 0.16 M. B) 6.25 M. C) 0.063 M. D) None of the above. Show Answer Correct Answer: A) 0.16 M. 8. What does the Latin root circum mean? A) Circumference. B) Circle. C) Around. D) Square. Show Answer Correct Answer: C) Around. 9. What is a database or database management system (SGBD)? A) Tool for handling data and extracting information. B) Data set related to the same context, stored and organized. C) Data set related to the same context, stored and organized, plus tools to manipulate them and extract information. D) None of the above. Show Answer Correct Answer: C) Data set related to the same context, stored and organized, plus tools to manipulate them and extract information. 10. Lime water changes the colour of blue litmus paper to A) Purple. B) Pink. C) Red. D) Green. Show Answer Correct Answer: C) Red. 11. NaCl is a ..... A) Acid. B) Base. C) Salt. D) Water. Show Answer Correct Answer: C) Salt. 12. In what ways is RNA different to DNA? A) DNA has uracil and ribose, whereas RNA has thymine and deoxyribose. B) RNA has uracil and is double stranded but DNA has thymine and is single stranded. C) DNA has ribose sugar and is double stranded, whereas RNA has deoxyribose sugar and is single stranded. D) RNA has ribose sugar and is single stranded, whereas DNA has deoxyribose sugar and is double stranded. Show Answer Correct Answer: D) RNA has ribose sugar and is single stranded, whereas DNA has deoxyribose sugar and is double stranded. 13. What is the formula of hydrogen? A) H. B) H$_{2}$. C) H$_{2}$O. D) NH$_{3}$. Show Answer Correct Answer: B) H$_{2}$. 14. All bases have what ion? A) Phosphate (PO$_{4}$$^{-3}$). B) Hypochlorite (ClO$^{-}$). C) Hydroxide (OH$^{-}$). D) CYANATE (CNO $ ^ {-} $). Show Answer Correct Answer: C) Hydroxide (OH$^{-}$). 15. Which of these characteristics has an acid A) Astringent. B) PH greater than 7. C) Sour. D) PH neutral. Show Answer Correct Answer: C) Sour. 16. The root word graph (from Greek) means "to write" or "to draw." When you take a photograph, you're "writing down, " or recording, an image.A piece of writing might be accompanied by an illustration, or a graphic.The root word "choreo" means "to dance." What does "choreograph" mean? A) To create, or compose, a dance. B) To end a dance. C) To dance quickly on your feet. D) To play music for a dance. Show Answer Correct Answer: A) To create, or compose, a dance. 17. Which shows the correct complementary base pairing for DNA? A) C-A, T-G. B) A-G, C-T. C) C-G, U-A. D) T-A, G-C. Show Answer Correct Answer: D) T-A, G-C. 18. Which of the following substances is most likely to be acidic? A) Soap. B) Vinegar. C) Baking soda. D) Ammonia. Show Answer Correct Answer: B) Vinegar. 19. Select the name for the following acid:HC$_{2}$H$_{3}$O$_{2}$ A) Acetic acid. B) Ethanoic acid. C) Acenous acid. D) Hydroacetic acid. Show Answer Correct Answer: A) Acetic acid. 20. Given that 4x5$^{3 }$+ 2x5$^{2 }$+ 5y = 4230$_{5, }$find the value of y. A) 0. B) 2. C) 3. D) 6. Show Answer Correct Answer: C) 3. 21. 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) An acid. B) A base. C) A salt. D) A hydrate. Show Answer Correct Answer: B) A base. 22. C pairs with A) A. B) T. C) G. D) C. Show Answer Correct Answer: C) G. 23. What base pairs with cytosine? A) Guanine. B) Adenine. C) Thymine. D) Magazine. Show Answer Correct Answer: A) Guanine. 24. 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. 25. Examples:baking soda, drain cleaner, Tums A) Acid. B) Base. C) Neutral. D) None of the above. Show Answer Correct Answer: B) Base. ← 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 9Class 7 Science Chapter 4 Bases Quiz 10Class 7 Science Chapter 4 Bases Quiz 11 🏠 Back to Homepage 📘 Download PDF Books 📕 Premium PDF Books