This quiz works best with JavaScript enabled. Home > Class 7 > Class 7 Science Chapter 4 Bases – Quiz 6 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 7 Science Chapter 4 Bases Quiz 6 (25 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. Sodium hydroxide is a A) Weak acid. B) Weak base. C) Strong acid. D) Strong base. Show Answer Correct Answer: D) Strong base. 2. What is plaster of Paris? A) $ CASE 4 \\FRA {.1} {2} H2O $. B) $CaSO_4.2H_2O$. C) $ Case_4 $. D) $ Caocl_2 $. Show Answer Correct Answer: A) $ CASE 4 \\FRA {.1} {2} H2O $. 3. Adenine, Cytosine, Guanine and Thymine are examples of A) DNA structure. B) DNA bases. C) DNA double helix. D) Paired bases. Show Answer Correct Answer: B) DNA bases. 4. Type of substance that when dissociating produces an oh-ions A) Hydroxides. B) Agua. C) Sales. D) Acids. Show Answer Correct Answer: A) Hydroxides. 5. Hydrochloric acid produces ..... salts A) Chloride. B) Nitrate. C) Sulphate. D) Carbonate. Show Answer Correct Answer: A) Chloride. 6. What is the pH range of a neutral solution? A) 0-1. B) 3-4. C) 7. D) 10-11. Show Answer Correct Answer: C) 7. 7. Koh is a name base: A) Calcium hydroxide. B) Kalium hydroxide. C) Potassium hydroxide. D) None of the above. Show Answer Correct Answer: C) Potassium hydroxide. 8. DNA directs the synthesis of A) Sugars. B) Proteins. C) Lipids. D) None of the above. Show Answer Correct Answer: B) Proteins. 9. The smallest part of an element is A) Proton. B) Atom. C) Compound. D) Mixture. Show Answer Correct Answer: B) Atom. 10. Sour and Sticky A) Acid. B) Base. C) Neutral. D) Lemon. Show Answer Correct Answer: A) Acid. 11. Select the name of the following acid:HF A) Hydrofluoric acid. B) Fluorous acid. C) Fluoric acid. D) Hydroflouric acid. Show Answer Correct Answer: A) Hydrofluoric acid. 12. A solution has a pH of 6.2, if its hydrogen ion concentration is decreased by 100 times, what would its new pH be? A) 5.2. B) 7.2. C) 8.2. D) 4.2. Show Answer Correct Answer: C) 8.2. 13. What does Latin root ambi mean? A) Both. B) Water. C) Ambiguous. D) Good. Show Answer Correct Answer: A) Both. 14. A student measures the pH of a substance using pH paper. It turns a dark blue and is determined to have a pH of 13. Which of the following best describes this substance? A) Strong base. B) Strong acid. C) Weak base. D) Weak acid. Show Answer Correct Answer: A) Strong base. 15. A substance that is corrosive to metals A) Base. B) Acid. C) Both. D) Neither. Show Answer Correct Answer: B) Acid. 16. The rules of DNA pairing states that Adenine (A) always pairs up with A) Thymine. B) Cytosine. C) Adenine. D) Guanine. Show Answer Correct Answer: A) Thymine. 17. The root fin (from Latin) means "end." So we've come to the end of this song, the finale.Finally, can you see how much you've learned about roots?If the prefix "in-" means "not, " what is the definition of "infinite" ? A) Never ending. B) Always ending. C) Seeing an ending. D) A written ending. Show Answer Correct Answer: A) Never ending. 18. Lily investigates the relative stability of phosphoric acid and citric acid. She adds phosphoric acid in test tube X and citric acid in test tube Y. A piece of magnesium is then added to each tube. State the observation in each. A) More bubbles are produced in X compared to Y. B) More bubbles are produced in Y compared to X. C) Both produce the same amount of bubbles. D) X shows bubbles while Y does not shows bubbles. Show Answer Correct Answer: A) More bubbles are produced in X compared to Y. 19. What is the meaning of the Greek base 'micro'? A) Small. B) Large. C) Earth. D) Heat. Show Answer Correct Answer: A) Small. 20. What is the formula of sodium hydroxide? A) KOH. B) NaOH. C) Ca (oh) $ _ {2} $. D) NH$_{3 }$(aq). Show Answer Correct Answer: B) NaOH. 21. What is the percentage of water vapor in the air A) Atmospheric pressure. B) Article. C) Concentration. D) Ghani building. Show Answer Correct Answer: B) Article. 22. How do acid base indicators work? A) They change smell in different pH values. B) They change temperature in different pH values. C) They do not do anything in different pH values. D) They change color in different pH values. Show Answer Correct Answer: D) They change color in different pH values. 23. Which of the following bases is not found in DNA? A) Adenine. B) Thymine. C) Uracil. D) Guanine. Show Answer Correct Answer: C) Uracil. 24. The latin root bene means- A) Bad. B) Good. C) Father. D) Bent. Show Answer Correct Answer: B) Good. 25. When an acid reacts with a base, what are the products formed? A) Salt and water. B) Hydrogen gas and salt. C) Water and carbon dioxide. D) Salt and oxygen. Show Answer Correct Answer: A) Salt and water. ← 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 7Class 7 Science Chapter 4 Bases Quiz 8Class 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