This quiz works best with JavaScript enabled. Home > Class 7 > Class 7 Science Chapter 4 Bases – Quiz 1 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 7 Science Chapter 4 Bases Quiz 1 (25 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. What century is the year 2021? A) 20th century. B) 21st century. C) 21st century. D) 19th century. Show Answer Correct Answer: B) 21st century. 2. Which of the following is NOT a property of a base? A) When mixed with an acid it becomes neutralized. B) Slippery to touch. C) Measures 8-14 on the pH scale. D) Reacts with metals. Show Answer Correct Answer: D) Reacts with metals. 3. Solve for n:2$^{-2n}$ = 2$^{6}$ A) -1. B) -7. C) 5. D) -3. Show Answer Correct Answer: D) -3. 4. Which base is not found in DNA but is found in RNA? A) Adenine. B) Thymine. C) Uracil. D) Guanine. Show Answer Correct Answer: C) Uracil. 5. What is the pH range of an acidic solution? A) 0 to 7. B) 7 to 14. C) Exactly 7. D) Above 14. Show Answer Correct Answer: A) 0 to 7. 6. What is the effect of an alkali on red litmus paper? A) It turns blue litmus paper red. B) It turns red litmus paper blue. C) It has no effect on litmus paper. D) It causes the litmus paper to change color based on its concentration. Show Answer Correct Answer: B) It turns red litmus paper blue. 7. Which of the following latin roots means to write? A) Spect. B) Bene. C) Mater. D) Scrib/script. Show Answer Correct Answer: D) Scrib/script. 8. Which nitrogen base is replaced by uracil in RNA? A) Adenine. B) Guanine. C) Cytosine. D) Thymine. Show Answer Correct Answer: D) Thymine. 9. Paternity has to do with being a ..... A) Father. B) Mother. C) Sister. D) Brother. Show Answer Correct Answer: A) Father. 10. If there is excess hydroxide ions, the solution will be ..... A) Acidic. B) Basic. C) All the above. D) None of the above. Show Answer Correct Answer: B) Basic. 11. Which compound represents an base? A) NaOH. B) HCl. C) CH$_{2}$OH. D) NaCl. Show Answer Correct Answer: A) NaOH. 12. The effect of the following test solution on turmeric:-a) Vinegarb)Sugarc) soap A) A) Yellowb) Red c) Red. B) A) Yellowb) Red c) Yellow. C) A) Yellowb) Yellowc) Red. D) None of these. Show Answer Correct Answer: C) A) Yellowb) Yellowc) Red. 13. How many carbon atoms are there in a ribose and a deoxyribose sugar molecule? A) Six. B) Five. C) Three. D) Eight. Show Answer Correct Answer: B) Five. 14. Acids are neutralised by ..... A) Bases. B) Metals. C) Water. D) Hydrogen gas. Show Answer Correct Answer: A) Bases. 15. HBr is the conjugate acid of A) Br$^{1-}$. B) Br$_{2}$. C) H$_{2}$Br. D) None of the above. Show Answer Correct Answer: A) Br$^{1-}$. 16. Baking soda is A) A base. B) An acid. C) Neutral. D) None of the above. Show Answer Correct Answer: A) A base. 17. Plaster of Paris Technical Formula ..... A) Case $ _ {4} $ 1/2 h $ _ {2} $ o. B) Case $ _ {4} $ 2 h $ _ {2} $ o. C) Case $ _ {4} $ 5 h $ _ {2} $ o. D) Case $ _ {4} $. Show Answer Correct Answer: A) Case $ _ {4} $ 1/2 h $ _ {2} $ o. 18. What is the correct name for the base with the formula $NaOH$ A) Sodium hydroxide. B) Sodium oxide. C) Sodium hydride. D) Sodium peroxide. Show Answer Correct Answer: A) Sodium hydroxide. 19. What type of salt can hydrochloric acid produce? A) Calcium hydrochloric. B) Calcium hydrochloride. C) Calcium chloride. D) Calcium nitrate. Show Answer Correct Answer: C) Calcium chloride. 20. What type of arrow is used to express a strong acid? A) $\rightarrow$. B) < . C) <$\rightarrow$. D) None of these. Show Answer Correct Answer: A) $\rightarrow$. 21. The pH range of less than 7 to 0 corresponds to substances with character: A) Salado. B) Acid. C) Redox. D) Basic. Show Answer Correct Answer: B) Acid. 22. What is the endpoint of a titration A) Where the amount of acid and base are equal as shown by a color change. B) Where there is no base. C) When the volume of base in the burette is used up. D) When there is no acid. Show Answer Correct Answer: A) Where the amount of acid and base are equal as shown by a color change. 23. We used pH strips as the indicators in our household acid and base substance test. We also talked about litmus papers as another type of indicator. What property changes on the pH strip or litmus paper to show if an substance is an acid or base? A) Smell. B) Color. C) Concentration. D) Taste. Show Answer Correct Answer: B) Color. 24. Solve. $5^{3-2x}=5^{-x}$ A) $-3$. B) $1$. C) $\frac{1}{3}$. D) $3$. Show Answer Correct Answer: D) $3$. 25. What is the Latin root of the word paternity? A) Father. B) Pater. C) Nity. D) Mother. Show Answer Correct Answer: B) Pater. 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