This quiz works best with JavaScript enabled. Home > Class 7 > Class 7 Science Chapter 4 Bases – Quiz 11 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 7 Science Chapter 4 Bases Quiz 11 (25 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. T A G G A C T The complementary strand is ..... A) T A G G A C T. B) A T G G T G A. C) A T C C T G A. D) T T C C A G T. Show Answer Correct Answer: C) A T C C T G A. 2. What type of arrow is used to express a weak base? A) $\rightarrow$. B) < . C) <$\rightarrow$. D) None of these. Show Answer Correct Answer: C) <$\rightarrow$. 3. A pH of 1-6 is a(n) ..... ? A) Acid. B) Base. C) Neutral. D) Spaghetti. Show Answer Correct Answer: A) Acid. 4. What is the name of the liquid used for car batteries? A) HCL. B) Hydrochloric acid. C) H2SO4. D) Phosphoric acid. Show Answer Correct Answer: C) H2SO4. 5. Solve 7$^{3x+2}$ = 7$^{x-8}$ A) -5. B) -4. C) 2. D) -3. Show Answer Correct Answer: A) -5. 6. CsOH is classified as a: A) Strong acid. B) Weak acid. C) Strong base. D) Weak base. Show Answer Correct Answer: C) Strong base. 7. Assertion (A):Neutralization reaction is accompanied by evolution of heat. Reason (R):Neutralization reaction is a reaction between an acid and a base to form salt and water. A) Both A and R are true and R is the correct explanation of A. B) Both A and R are true but R is not the correct explanation of A. C) A is true but R is false. D) A is false but R is true. Show Answer Correct Answer: B) Both A and R are true but R is not the correct explanation of A. 8. In a ..... reaction, an acid and a base produce a salt and a water. A) Concentrated. B) Decomposition. C) Dilute. D) Neutralization. Show Answer Correct Answer: D) Neutralization. 9. A students tests a substance using red litmus paper and phenolpthalein. The phenolpthalein stayed colorless while the red litmus paper turned violet. What kind of substance was being studied? A) Acid solution. B) Base solution. C) Neutral solution. D) Salt solution. Show Answer Correct Answer: C) Neutral solution. 10. Has a bitter taste and is slippery ..... A) Base. B) Acid. C) Neutral. D) Soap. Show Answer Correct Answer: A) Base. 11. NaOH is: A) An Arrhenius base. B) An Arrhenius acid. C) Neither an acid nor a base. D) Both an acid and a base. Show Answer Correct Answer: A) An Arrhenius base. 12. The indicator bromthymol blue is added to a solution with a pH of 10 what color will it turn? A) Yellow. B) Blue. C) Pink. D) Orange. Show Answer Correct Answer: B) Blue. 13. This substance releases OH-into solution A) Acid. B) Base. C) Neutral. D) None of the above. Show Answer Correct Answer: B) Base. 14. Convert 123$_{4}$ to base 10? A) 18. B) 123. C) 27. D) 25. Show Answer Correct Answer: C) 27. 15. How many DNA molecules does replication start with, and end with? A) 2 $\rightarrow$ 1. B) 1 $\rightarrow$ 2. C) 2 $\rightarrow$ 4. D) 10 $\rightarrow$ 20. Show Answer Correct Answer: B) 1 $\rightarrow$ 2. 16. Which of the following solutions will turn orange if methyl orange is added to it? A) 1.0 M of HCl. B) 1.0m of NaOH. C) .1 M of KCl. D) 10 M of LiOH. Show Answer Correct Answer: A) 1.0 M of HCl. 17. Which of the following is an example of a substance that has a neutral pH? A) Lemon juice. B) Water. C) Lysol. D) Vinegar. Show Answer Correct Answer: B) Water. 18. Indicators are substances that help us ..... whether the the given solution is acidic or basic A) Detect. B) Remove. C) Throw. D) Find. Show Answer Correct Answer: A) Detect. 19. Which of the following latin roots means to throw? A) Jud. B) Aud. C) Ject. D) With. Show Answer Correct Answer: C) Ject. 20. NH$_{3}$ + H$_{2}$O $\rightarrow$ NH$_{4}$$^{+}$ + OH$^{-}$ NH$_{3}$ is a Bronsted Lowry A) Acid. B) Base. C) Conjugate acid. D) Conjugate base. Show Answer Correct Answer: B) Base. 21. When the pH of a solution changes from a pH of 8 to a pH of 9, the hydroxide 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: C) 10 times the original content. 22. Is the following compound an acid or a base?HCl A) Acid. B) Base. C) All the above. D) None of the above. Show Answer Correct Answer: A) Acid. 23. If Lisa says the painting is spectacular, she means that it ..... beautiful. A) Sounds. B) Sends. C) Looks. D) Throws. Show Answer Correct Answer: C) Looks. 24. Special type of substances are used to test whether a substance is acidic or basic. A) Neutral. B) Indicators. C) Salt. D) All of them above. Show Answer Correct Answer: B) Indicators. 25. If one strand of DNA says GCT, the other strand says: A) GCT. B) CTA. C) CGA. D) TCG. Show Answer Correct Answer: C) CGA. ← 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