This quiz works best with JavaScript enabled. Home > Class 7 > Class 7 Science Chapter 4 Bases – Quiz 7 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 7 Science Chapter 4 Bases Quiz 7 (25 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. A nucleotide is the building block of: A) DNA. B) Protein. C) Cell membranes. D) Mitochondria. Show Answer Correct Answer: A) DNA. 2. Distilled water has a pH A) Alkali. B) Basic. C) Acid. D) Neutral. Show Answer Correct Answer: D) Neutral. 3. Name the following compound H$_{2}$Se A) Hydrogen selenium acid. B) Dihydrogen selenide. C) Hydroselenic acid. D) Selenic acid. Show Answer Correct Answer: C) Hydroselenic acid. 4. What is present in aqueous solutions of an acid or alkali that allow them to conduct electricity? A) Mobile electrons. B) Mobile ions. C) Mobile atoms. D) Mobile molecules. Show Answer Correct Answer: B) Mobile ions. 5. "limewater turns milky" is a test for which gas? A) Hydrogen. B) Carbon dioxide. C) Oxygen. D) Air. Show Answer Correct Answer: B) Carbon dioxide. 6. If there is 22% Cytosine, how much of all the other bases are there? A) 22% C, 22% G, 28% A, and 28%T. B) 22% C, 28% G, 22% A, and 28%T. C) 28% C, 28% G, 28% A, and 28%T. D) 22% C, 22% G, 22% A, and 22%T. Show Answer Correct Answer: A) 22% C, 22% G, 28% A, and 28%T. 7. Is the following substance an acid or a base? H2(SO4) A) Acid. B) Base. C) All the above. D) None of the above. Show Answer Correct Answer: A) Acid. 8. What is the positive ion in the following formula?H $ _ {2} $ s A) Hydrogen. B) Sulfur. C) The two elements. D) There are no charges. Show Answer Correct Answer: A) Hydrogen. 9. The FULL NAME of the letter T from the DNA alphabet is: A) Thymine. B) Tyrosine. C) Tryptophan. D) Tellurium. Show Answer Correct Answer: A) Thymine. 10. A strong alkali dissociates more than what percentage of its molecules in water? A) 10%. B) 30%. C) 50%. D) 100%. Show Answer Correct Answer: B) 30%. 11. It is one thing or object of the real world, it can also be an abstract concept and is distinguishable from all other objects.It has a set of properties or attributes that characterize it. A) ATTRIBUTE. B) ENTITY. C) RELATIONSHIP. D) NONE. Show Answer Correct Answer: B) ENTITY. 12. In a DNA double helix, adenine pairs with which other base? A) Cytosine. B) Guanine. C) Thymine. D) Uracil. Show Answer Correct Answer: C) Thymine. 13. What is the significance of complementary base pairing in DNA replication? A) It allows DNA to form a double helix. B) It ensures accurate copying of genetic information. C) It provides energy for the replication process. D) It helps in the synthesis of proteins. Show Answer Correct Answer: B) It ensures accurate copying of genetic information. 14. What base pairs with thymine? A) Adenine. B) Guanine. C) Cytosine. D) Limousine. Show Answer Correct Answer: A) Adenine. 15. Is the following substance an acid or a base? KOH A) Acid. B) Base. C) All the above. D) None of the above. Show Answer Correct Answer: B) Base. 16. A substance that is caustic A) Base. B) Acid. C) Both. D) Neither. Show Answer Correct Answer: A) Base. 17. The root word photo (from Greek) means "relating to light." A photograph is created when an image is focused on light sensitive material, like film, to make a permanent picture.Teachers photocopy tests and worksheets. "Photosynthesis" is a scientific process that A) Involves feet. B) Involves sound. C) Does not involve light. D) Involves light. Show Answer Correct Answer: D) Involves light. 18. What is the role of nitrogen bases in DNA? A) They form the backbone of the DNA strand. B) They store genetic information. C) They provide energy for cellular processes. D) They act as enzymes. Show Answer Correct Answer: B) They store genetic information. 19. What is the colour of universal indicator in a solution of pH 4? A) Red. B) Yellow. C) Blue. D) Green. Show Answer Correct Answer: B) Yellow. 20. The root word spec (from Latin) means "look." The officials inspected the field before the game began.Spectators are the people sitting in the stands at the game.A "spectacle" is a kind of performance that A) Is very interesting to look at. B) Is hard to hear. C) Includes only one performer. D) Includes music with a slow beat. Show Answer Correct Answer: A) Is very interesting to look at. 21. Which base is used in the neutralization of acids in wastewater treatment? A) Calcium hydroxide. B) Sodium hydroxide. C) Ammonium hydroxide. D) Potassium hydroxide. Show Answer Correct Answer: A) Calcium hydroxide. 22. Ammonia A) Base. B) Acid. C) All the above. D) None of the above. Show Answer Correct Answer: A) Base. 23. A neutralization reaction will (almost) always produce ..... A) Water & salt. B) Water. C) Salt. D) Water & carbon. Show Answer Correct Answer: A) Water & salt. 24. If the pOH of a solution is 2.8 what is the pH? A) 2.8. B) 7.2. C) 0.45. D) 11.2. Show Answer Correct Answer: D) 11.2. 25. Base is a substance that does not have hydrogen in its composition.This statement is: A) True, for sure. B) False, are you crazy?It makes no sense. C) True, but there are exceptions. D) None of the above. Show Answer Correct Answer: B) False, are you crazy?It makes no sense. ← 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 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