This quiz works best with JavaScript enabled. Home > Class 7 > Class 7 Science Chapter 4 Bases – Quiz 10 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 7 Science Chapter 4 Bases Quiz 10 (25 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. Red litmus paper tuns blue whenever reacting with a ..... ? A) Base. B) Acid. C) Neutral. D) Cheez-it. Show Answer Correct Answer: A) Base. 2. A pH and a pOH will add up to: A) 0. B) 7. C) 14. D) 1.0 x 10$^{-14}$. Show Answer Correct Answer: C) 14. 3. What is the shape of a DNA? A) Double Helix. B) Base Pairing. C) The shape of you. D) Hydrogen Bonding. Show Answer Correct Answer: A) Double Helix. 4. What is the subunit of DNA? A) Polysaachride. B) Polypeptide. C) Nucleotide. D) None of the above. Show Answer Correct Answer: C) Nucleotide. 5. The root spect means A) To say. B) To look. C) To carry. D) To write. Show Answer Correct Answer: B) To look. 6. If a DNA sequence it GAATGCCT, what are the matching base pairs? A) ACGTACCTG. B) AEIOU and sometimes Y. C) Cttacgga. D) GCCTATGC. Show Answer Correct Answer: C) Cttacgga. 7. According to Bronsted-Lowry, what is the definition of an BASE? A) A substance that donates a hydrogen (H+) ion. B) A substance that donates a hydroxide (OH-) ion. C) A substance that accepts a hydrogen (H+) ion. D) A substance that accepts a hydroxide (OH-) ion. Show Answer Correct Answer: C) A substance that accepts a hydrogen (H+) ion. 8. Which of the following is a weak acid? A) HCl. B) HBr. C) HI. D) HF. Show Answer Correct Answer: D) HF. 9. Base:substance that in solution releases oxidrile ions (Oh $^{-1} $) it contains. A) Arrhenius Theory. B) TEORIA DE BRONSTED-LOWRY. C) Acid reactions. D) N.A. Show Answer Correct Answer: A) Arrhenius Theory. 10. What is the meaning of the Greek base phon? A) Movement or motion. B) Sound or voice. C) Light or brightness. D) Silence or quiet. Show Answer Correct Answer: B) Sound or voice. 11. What is the formula of carbon dioxide? A) H$_{2}$O. B) H$_{2}$. C) CO$_{2}$. D) NH$_{3}$. Show Answer Correct Answer: C) CO$_{2}$. 12. Water can act as an acid or a base, so it is called substance ..... A) Amphotera. B) Phenolphthalein. C) Neutralized. D) N.A. Show Answer Correct Answer: A) Amphotera. 13. Which of the following is an example of a base but not an alkali? A) Sodium hydroxide (NaOH). B) Potassium hydroxide (KOH). C) Ferric hydroxide (Fe(OH)3). D) Calcium hydroxide (Ca(OH)2). Show Answer Correct Answer: C) Ferric hydroxide (Fe(OH)3). 14. A process in which DNA has the unique ability to make an exact copy of itself. A) Replication. B) Translation. C) Transcription. D) Protein Synthesis. Show Answer Correct Answer: A) Replication. 15. Bases release ..... A) Hydrogen ions. B) Hydroxide ions. C) Sodium ions. D) Hydrogen gas. Show Answer Correct Answer: B) Hydroxide ions. 16. Which of these is correct? A) Phenolphathalein. B) Phenothalein. C) Phenolphthalein. D) Phenolphthalien. E) None of these. Show Answer Correct Answer: C) Phenolphthalein. 17. Nitric acid turn red litmus blue A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: A) True. 18. When the pH of a solution changes from a pH of 9 to a pH of 7, the hydrogen ion concentration is? A) 0.01 of the original content. B) 0.1 of the original content. C) 10 times the original content. D) 100 times the original content. Show Answer Correct Answer: D) 100 times the original content. 19. Lemon juice is A) A base. B) An acid. C) Neutral. D) None of the above. Show Answer Correct Answer: B) An acid. 20. Water has a pH ..... A) Greater than 7. B) Lower than 7. C) Equal to 7. D) None of the above. Show Answer Correct Answer: C) Equal to 7. 21. True or False:DNA is found in ALL organisms A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: A) True. 22. PH stands for: A) Potency of hydrogen. B) Plurality of hydrogen. C) Potential of hydrogen. D) Pleurisy of hydrogen. Show Answer Correct Answer: C) Potential of hydrogen. 23. Nucleotides are: A) Monomers of proteins. B) Polymers of RNA. C) DNA base pairs. D) Monomers of DNA. Show Answer Correct Answer: D) Monomers of DNA. 24. If a strand of DNA has 39% Cytosine, it has ..... A) 39% Adenine. B) 39% Guanine. C) 39% Thymine. D) 39% combined Cytosine and Guanine. Show Answer Correct Answer: B) 39% Guanine. 25. Each row of a table is a????????? A) Record. B) Given. C) Tabla. D) Campo. Show Answer Correct Answer: A) Record. ← 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 11 🏠 Back to Homepage 📘 Download PDF Books 📕 Premium PDF Books