This quiz works best with JavaScript enabled. Home > Class 7 > Class 7 Science Chapter 4 Bases – Quiz 15 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 7 Science Chapter 4 Bases Quiz 15 (25 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. Which of the following is a property of acids? A) They turn litmus paper blue. B) They have a slippery feel. C) They react with metals to produce hydrogen gas. D) They have a bitter taste. Show Answer Correct Answer: C) They react with metals to produce hydrogen gas. 2. Change 351 $ _ {10} $ to a number in base eight.Change 351 $ _ {10} $ to number in basis eight. A) 637$_{8}$. B) 547$_{8}$. C) 537$_{8}$. D) 532$_{8}$. Show Answer Correct Answer: C) 537$_{8}$. 3. Is the following substance an acid or a base? Ca(OH)2 A) Acid. B) Base. C) All the above. D) None of the above. Show Answer Correct Answer: B) Base. 4. 8 $^{} $$^{zx+h} $ = 8 $^{w} $ A) X=28. B) X=3. C) X=1. D) X=12. Show Answer Correct Answer: C) X=1. 5. Vinegar is an example of A) Acid. B) Base. C) Neither acid or base. D) None of the above. Show Answer Correct Answer: A) Acid. 6. Say the name of this compound NaOH A) Hydrogenic acid. B) Formic acid. C) Hydrochloric acid. D) Sodium hydroxide. Show Answer Correct Answer: D) Sodium hydroxide. 7. In RNA, which nitrogen base pairs with adenine? A) Thymine. B) Cytosine. C) Guanine. D) Uracil. Show Answer Correct Answer: D) Uracil. 8. Vinegar A) Acid. B) Base. C) All the above. D) None of the above. Show Answer Correct Answer: A) Acid. 9. Turns bright pink in a strong base ..... A) Phenolphthalein. B) Citric Acid. C) Distilled water. D) Blue litmus paper. Show Answer Correct Answer: A) Phenolphthalein. 10. Which experiment demonstrated that DNA is the genetic material? A) Hershey-Chase experiment. B) Mendel's pea plant experiment. C) Griffith's transformation experiment. D) Avery-MacLeod-McCarty experiment. Show Answer Correct Answer: A) Hershey-Chase experiment. 11. Sometimes DNA is referred to as a "polymer of nucleotides" . What does this mean? A) DNA is the 'glue' which sticks nucleotides together. B) DNA is a long chain of nucleotide monomers. C) DNA is a nucleotide made from many parts. D) DNA is found in the nucleus of many cells. Show Answer Correct Answer: B) DNA is a long chain of nucleotide monomers. 12. If you have a pH of 4, what is the pOH A) 10. B) 8. C) 12. D) 57. Show Answer Correct Answer: A) 10. 13. The roots mit or miss (from Latin) mean "send." A missive is a form of written communication, usually a letter.You need permission to park your car in a certain place.If you "transmit" a message, you A) Send it from one person to another. B) Write it down for yourself to remember. C) Keep it a secret. D) Destroy it. Show Answer Correct Answer: A) Send it from one person to another. 14. "A lit splint gives a squeaky pop" is a test for which gas? A) Hydrogen. B) Carbon dioxide. C) Oxygen. D) Air. Show Answer Correct Answer: A) Hydrogen. 15. How does the concentration of an alkali differ from its strength? A) Concentration is related to the solubility of an alkali. B) Strength is determined by how much hydroxyl ion is produced. C) Concentration affects the dissociation of alkalis. D) Strength refers to the amount of alkali dissolved. Show Answer Correct Answer: B) Strength is determined by how much hydroxyl ion is produced. 16. Which base is found in soap A) Sodium oxide. B) Sodium cloride. C) Sodium hydroxide. D) Potassium oxide. Show Answer Correct Answer: C) Sodium hydroxide. 17. Select the formula for the following base:sodium hydroxide A) NaOH. B) To $ _ {} $ (oh) $ _ {2} $. C) NaH. D) None of the above. Show Answer Correct Answer: A) NaOH. 18. The rules of DNA pairing states that Cytosine (C) always pairs up with A) Thymine. B) Cytosine. C) Adenine. D) Guanine. Show Answer Correct Answer: D) Guanine. 19. How can the strength of an alkali be determined? A) By its solubility in water. B) By the amount of hydroxyl ions it produces in water. C) By its color in litmus test. D) By its concentration in water. Show Answer Correct Answer: B) By the amount of hydroxyl ions it produces in water. 20. The difference between the values of the digits 2 in the number $3212_5$ A) 8. B) 12. C) 48. D) 52. Show Answer Correct Answer: C) 48. 21. A turmeric paper was fist dipped in a washing soda solution, then the same turmeric paper was dipped in HCl. What will be the final colour of the turmeric paper? A) Brownish red. B) No colour change. C) Yellow colour. D) Data given not sufficient. Show Answer Correct Answer: C) Yellow colour. 22. What does DNA do? A) It carries genetic codes from parents to offspring. B) It carries oxygen from the lungs to the body. C) It tells you who you are. D) It defines the organism. Show Answer Correct Answer: A) It carries genetic codes from parents to offspring. 23. Which solution reacts with LiOH to produce a salt and water? A) KCl. B) CaO. C) NaOH. D) H2SO4. Show Answer Correct Answer: D) H2SO4. 24. Which organelle is DNA usually found in? A) Cell membrane. B) Vacuole. C) Ribosome. D) Nucleus. Show Answer Correct Answer: D) Nucleus. 25. Select the formula for the following acid:nitrous acid A) HNO$_{2}$. B) HNO$_{3}$. C) H$_{3}$N. D) None of the above. Show Answer Correct Answer: A) HNO$_{2}$. ← 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