This quiz works best with JavaScript enabled. Home > Class 7 > Class 7 Science Chapter 4 Bases – Quiz 24 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 7 Science Chapter 4 Bases Quiz 24 (15 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. Convert 145 to base 4. A) 145$_{4}$. B) 2101$_{4}$. C) 3001$_{4}$. D) 1202$_{4}$. Show Answer Correct Answer: B) 2101$_{4}$. 2. Which of the following base absorbs Carbon dioxide (CO$_{2}$) A) Mg(OH)$_{2}$. B) CuSO $ _ {4} $. C) KOH. D) NaoH. Show Answer Correct Answer: C) KOH. 3. What is the value of digit 2, in base ten, in the number 4231$_{5}$? A) 50. B) 100. C) 200. D) 250. Show Answer Correct Answer: A) 50. 4. Which of the following best describes the structure of DNA? A) Single-stranded helix. B) Double-stranded helix. C) Triple-stranded helix. D) Quadruple-stranded helix. Show Answer Correct Answer: B) Double-stranded helix. 5. Which Greek base means 'earth'? A) Geo. B) Bio. C) Therm. D) Chron. Show Answer Correct Answer: A) Geo. 6. The correct formula of copper II hydroxide is: A) What (oh) $ _ {2} $. B) With (oh) $ _ {2} $. C) Cuoh. D) CoOH. Show Answer Correct Answer: B) With (oh) $ _ {2} $. 7. Strong base will have a A) Low concentration of hydronium ions. B) High concentration of hydronium ions. C) High concentration of hydroxide ions. D) Low concentration of hydroxide ions. Show Answer Correct Answer: C) High concentration of hydroxide ions. 8. The indicator bromcresol green is added to a solution with a pH of 5.6 what color will it turn? A) Yellow. B) Blue. C) Red. D) Orange. Show Answer Correct Answer: B) Blue. 9. Acid has which taste A) Sour. B) Bitter. C) Spicy. D) None of the above. Show Answer Correct Answer: A) Sour. 10. What is the meaning of the Greek base 'graph'? A) Write. B) Sound. C) Light. D) Water. Show Answer Correct Answer: A) Write. 11. Which base is used in the production of bleach? A) Sodium hydroxide. B) Potassium hydroxide. C) Calcium hydroxide. D) Ammonium hydroxide. Show Answer Correct Answer: A) Sodium hydroxide. 12. Solve the equation:$4^{x+3}=4^9$ A) X = 7. B) X = 12. C) X = 6. D) X = 3. Show Answer Correct Answer: C) X = 6. 13. Tooth decay is caused due to presence of A) Base. B) Acid. C) Fungi. D) Neutral. E) None of these. Show Answer Correct Answer: A) Base. 14. Database consultations allow: A) Store information. B) Perform graphic interfaces. C) Know a certain data. D) None of the above. Show Answer Correct Answer: C) Know a certain data. 15. It takes 20 mL of 1.25 M LiOH solution to completely neutralize 100 mL of a sulfuric acid solution (HCl). What is the concentration of the HCl solution? A) .25 M. B) 2500 M. C) 10 M. D) 5.0 M. Show Answer Correct Answer: A) .25 M. ← PreviousRelated 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