This quiz works best with JavaScript enabled. Home > Cbse > Class 7 > Science > Bases > Class 7 Science Chapter 4 Bases – Quiz 10 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 7 Science Chapter 4 Bases Quiz 10 (12 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. 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. 2. Which Greek base means 'earth'? A) Geo. B) Therm. C) Chron. D) Bio. Show Answer Correct Answer: A) Geo. 3. The correct formula of copper II hydroxide is: A) What (oh) $ _ {2} $. B) With (oh) $ _ {2} $. C) CoOH. D) Cuoh. Show Answer Correct Answer: B) With (oh) $ _ {2} $. 4. Strong base will have a A) High concentration of hydronium ions. B) Low concentration of hydronium ions. C) Low concentration of hydroxide ions. D) High concentration of hydroxide ions. Show Answer Correct Answer: D) High concentration of hydroxide ions. 5. The indicator bromcresol green is added to a solution with a pH of 5.6 what color will it turn? A) Yellow. B) Orange. C) Blue. D) Red. Show Answer Correct Answer: C) Blue. 6. Acid has which taste A) Sour. B) Bitter. C) Spicy. D) None of the above. Show Answer Correct Answer: A) Sour. 7. What is the meaning of the Greek base 'graph'? A) Write. B) Light. C) Sound. D) Water. Show Answer Correct Answer: A) Write. 8. Which base is used in the production of bleach? A) Sodium hydroxide. B) Ammonium hydroxide. C) Calcium hydroxide. D) Potassium hydroxide. Show Answer Correct Answer: A) Sodium hydroxide. 9. Solve the equation:$4^{x+3}=4^9$ A) X = 3. B) X = 12. C) X = 6. D) X = 7. Show Answer Correct Answer: C) X = 6. 10. 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. 11. 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. 12. 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) 5.0 M. B) .25 M. C) 10 M. D) 2500 M. Show Answer Correct Answer: B) .25 M. ← PreviousRelated 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 7Class 7 Science Chapter 4 Bases Quiz 8 🏠 Back to Homepage 📘 Download PDF Books 📕 Premium PDF Books