This quiz works best with JavaScript enabled. Home > Cbse > Class 7 > Science > Bases > Class 7 Science Chapter 4 Bases – Quiz 2 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 7 Science Chapter 4 Bases Quiz 2 (60 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. Which of the following is true about the dilution of alkalis? A) Dilution of alkalis follows a similar process to the dilution of acids. B) Only concentrated alkalis can be diluted. C) Diluting alkalis is not recommended as it is a dangerous process. D) Alkalis cannot be diluted with water. Show Answer Correct Answer: A) Dilution of alkalis follows a similar process to the dilution of acids. 2. A substance that tastes bitter A) Base. B) Acid. C) Neutral. D) None of the above. Show Answer Correct Answer: A) Base. 3. Which Greek base means 'light'? A) Phon. B) Graph. C) Photo. D) Hydr. Show Answer Correct Answer: C) Photo. 4. Assertion (A):The substance which shows the nature of a solution as acidic or basic with the change in colour are called indicators. Reason (R):Red litmus turns blue in a solution containing vitamin 'C'. 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: C) A is true but R is false. 5. Name the Product, when a Strong Acid & a Strong Base reacts? A) Neutral salt and water. B) Acidic Salt. C) Basic salt. D) Acidic and Basic salt both. Show Answer Correct Answer: A) Neutral salt and water. 6. Examples:cola, vinegar, orange juice A) Acid. B) Base. C) Neutral. D) None of the above. Show Answer Correct Answer: A) Acid. 7. Acids have a pH of ..... A) Below 7. B) Above 7. C) Exactly 7. D) None of the above. Show Answer Correct Answer: A) Below 7. 8. Which of the following substances is basic? A) Soda. B) Vinegar. C) Soap. D) Lemon juice. Show Answer Correct Answer: C) Soap. 9. The building block of nucleic acids are nucleotides. Nucleotides are composed of a sugar, a phosphate group, and a ..... base. A) Nitrogen. B) Carbon. C) Oxygen. D) Hydrogen. Show Answer Correct Answer: A) Nitrogen. 10. HNO$_{3}$ + H$_{2}$O $\rightarrow$ H$_{3}$O$^{+}$ + NO$_{3}$$^{1-}$ NO$_{3}$$^{1-}$ is the conjugate base of A) H$_{2}$O. B) HNO$_{3}$. C) H$_{3}$O$^{+}$. D) None of the above. Show Answer Correct Answer: B) HNO$_{3}$. 11. The roots aster, astr and astro (from Greek) mean "stars." If you want to study stars, planets and asteroids, then you might become an astronomer.The symbol * is called an asterisk since it looks like a star. "Naut" is a root word that means "relating to the sea, ships or travelers." What would we call someone who travels into space among the stars? A) Portonaut. B) Astronaut. C) Telenaut. D) Photonaut. Show Answer Correct Answer: B) Astronaut. 12. What does the Latin root jud mean? A) Judge. B) Bad. C) Prejudice. D) To send. Show Answer Correct Answer: A) Judge. 13. Which pH represents the solution with the lowest Hydroxide ion concentration A) PH=7. B) PH=11. C) PH=1. D) PH=3. Show Answer Correct Answer: C) PH=1. 14. Which of the following is a common property of bases? A) They release H+ ions in water. B) They turn red litmus paper blue. C) They taste sour. D) They feel slippery. Show Answer Correct Answer: B) They turn red litmus paper blue. 15. Reacts with blue litmus paper turning it red A) Acid. B) Base. C) Neutral. D) None of the above. Show Answer Correct Answer: A) Acid. 16. Which Greek base means 'city'? A) Therm. B) Geo. C) Polis. D) Bio. Show Answer Correct Answer: C) Polis. 17. What is neutral on the pH scale? A) H shape. B) 7. C) P shape. D) 14. Show Answer Correct Answer: B) 7. 18. What type of bonds form between the nucleotide bases of the separate strands of the double stranded helix of DNA? A) Peptide bonds. B) Covalent bonds. C) Basic bonds. D) Hydrogen bonds. Show Answer Correct Answer: D) Hydrogen bonds. 19. Given that x$_{5}$ = 35$_{10, }$then x = A) 12. B) 10. C) 20. D) 120. Show Answer Correct Answer: D) 120. 20. What does the Latin root cent mean? A) Penny. B) One thousand. C) Dance. D) One hundred. Show Answer Correct Answer: D) One hundred. 21. Which sequence of DNA bases would pair with this partial strandATG TGA CAG A) TAC ACT GTC. B) Cat TCA CTG. C) ATG TGA CAG. D) GTA AGT GAC. Show Answer Correct Answer: A) TAC ACT GTC. 22. Identify the cardinality of the statement:a film actor has worked on one or more films throughout his career and in each film they have worked on an actors cast. A) Many to many. B) One to many. C) One by one. D) None of the above. Show Answer Correct Answer: A) Many to many. 23. What is the meaning of the Greek base 'chron'? A) Time. B) Heat. C) Earth. D) Life. Show Answer Correct Answer: A) Time. 24. Which substance has a sour taste? A) Acids. B) Bases. C) All the above. D) None of the above. Show Answer Correct Answer: A) Acids. 25. What does the Latin root fac mean? A) To make, to do. B) Strength. C) Break. D) To throw. Show Answer Correct Answer: A) To make, to do. 26. What does DNA stand for? A) Denitrogenous acid. B) Deribonucleic acid. C) Deoxyribonucleic acid. D) Diribonucleic acid. Show Answer Correct Answer: C) Deoxyribonucleic acid. 27. Which Greek base means 'star'? A) Bio. B) Therm. C) Astro. D) Geo. Show Answer Correct Answer: C) Astro. 28. How does DNA in cells determine an organism's complex traits? A) DNA contains codes for proteins, which are necessary for the growth and fuctioning of an organism. B) DNA seperates into long single strands that make up each part of an organism. C) DNA produces the energy an organism needs in order to grow. D) DNA folds into the nucleus of each of the cells of an organism. Show Answer Correct Answer: A) DNA contains codes for proteins, which are necessary for the growth and fuctioning of an organism. 29. Which of the following is an example of a neutralization reaction? A) . B) . C) . D) . Show Answer Correct Answer: A) . 30. What enzymes are involved in DNA replication? A) DNA polymerase, catalase. B) Helicase, DNA polymerase. C) Helicase, catalase. D) RNA polymerase, catalase. Show Answer Correct Answer: B) Helicase, DNA polymerase. 31. What century is the year 1080? A) 11th century. B) 12th century. C) 20th century. D) 16th century. Show Answer Correct Answer: A) 11th century. 32. What type of arrow is used to express a strong base? A) $\rightarrow$. B) < . C) <$\rightarrow$. D) None of these. Show Answer Correct Answer: A) $\rightarrow$. 33. What does the Latin root fract mean? A) Fracture. B) To lead. C) To say. D) To break. Show Answer Correct Answer: D) To break. 34. Blue litmus paper turns red whenever reacting with a ..... ? A) Neutral. B) Banana. C) Base. D) Acid. Show Answer Correct Answer: D) Acid. 35. Which of the compounds below is an electrolyte? A) LiCl. B) CH$_{3}$OH. C) Na. D) CH$_{4}$. Show Answer Correct Answer: A) LiCl. 36. What is the meaning of the Greek base ortho? A) Straight or correct. B) Bent or twisted. C) Unclear or vague. D) Crooked or wrong. Show Answer Correct Answer: A) Straight or correct. 37. Neutralization occurs when these react with bases forming a salt and water A) Acid. B) Base. C) Neutral. D) None of the above. Show Answer Correct Answer: A) Acid. 38. What is a field? A) Data storage area. B) Specific data storage area, commonly columns. C) Stored data area. D) Column area. Show Answer Correct Answer: B) Specific data storage area, commonly columns. 39. H$^{+}$(aq) + OH$^{-}$(aq) $\rightarrow$ H$_{2}$O(l) ..... this shows what type of reaction? A) Thermal decomposition. B) Neutralization. C) Physical reaction. D) Acidification. Show Answer Correct Answer: B) Neutralization. 40. What is the name of the acid HNO$_{3}$ A) Nitroxy acid. B) Hydro nitirc acid. C) Nitric acid. D) Nitrate acid. Show Answer Correct Answer: C) Nitric acid. 41. What is the primary difference between a base and an alkali? A) Bases are more reactive than alkalis. B) Alkalis are soluble in water, while bases may not be. C) Alkalis have a higher concentration of hydroxyl ions. D) Bases are always more basic than alkalis. Show Answer Correct Answer: B) Alkalis are soluble in water, while bases may not be. 42. When you put an acidic solution into a basic solution ..... A) It creates a stronger base. B) They neutralize each other and the pH changes to closer to 7 (neutral). C) It explodes. D) It creates a stronger acid. Show Answer Correct Answer: B) They neutralize each other and the pH changes to closer to 7 (neutral). 43. According to Arrhenius acid-base theory, an acid is ..... A) An H+ acceptor. B) Anything with an H+. C) A substance that produces H+ in water. D) A H+ donor. Show Answer Correct Answer: C) A substance that produces H+ in water. 44. What occurs when an alkali is dissolved in water? A) It produces hydroxide ions (OH-). B) It becomes acidic. C) It remains neutral. D) It produces hydrogen ions (H+). Show Answer Correct Answer: A) It produces hydroxide ions (OH-). 45. What is the pH of a reaction between a strong acid and strong base? A) 10. B) 7. C) 0. D) 5. Show Answer Correct Answer: B) 7. 46. The root word meter (from Greek) means "measure." If you want to measure how hot or cold something is, just use a thermometer.If you want to measure how far your car has traveled, check the odometer.A "gasometer" is used for holding and ..... gas. A) Carrying. B) Measuring. C) Looking at. D) Sending. Show Answer Correct Answer: B) Measuring. 47. What does the Greek root "nym" mean? A) Light. B) Word. C) Small. D) Water. Show Answer Correct Answer: B) Word. 48. What is the meaning of the Greek base 'bio'? A) Heat. B) Life. C) Time. D) Earth. Show Answer Correct Answer: B) Life. 49. What is the colour of universal indicator in pure water? A) Red. B) Violet. C) Green. D) Blue. Show Answer Correct Answer: C) Green. 50. The three parts of a nucleotide are: A) Sugar, phosphate, letter from DNA alphabet. B) Phosphate, protein, letter from DNA alphabet. C) Phosphate, sulphur, letter from DNA alphabet. D) Sugar, protein, letter from DNA alphabet. Show Answer Correct Answer: A) Sugar, phosphate, letter from DNA alphabet. 51. Which letter pairs with-A A) C. B) G. C) T. D) None of the above. Show Answer Correct Answer: C) T. 52. Which substance has a bitter taste? A) Acids. B) Bases. C) All the above. D) None of the above. Show Answer Correct Answer: B) Bases. 53. Curd contains (a) ..... , whereas lime water has (b) ..... A) A= Citric acid ; b= Sodium hydroxide. B) A= Lactic acid ; b= Calcium hydroxide. C) A= Calcium hydroxide ; b= Lactic acid. D) None of these. Show Answer Correct Answer: B) A= Lactic acid ; b= Calcium hydroxide. 54. This theory is based on the molecular structure of substances. A) N.A. B) Arrhenius Theory. C) TEORIA DE BRONSTED-LOWRY. D) TEORIA THE LEWIS. Show Answer Correct Answer: D) TEORIA THE LEWIS. 55. Mg (oh) $ _ {2} $ is a name base: A) Magnesium Hydroxide II. B) Manganese hydroxide. C) Manganese Hydroxide II. D) Magnesium hydroxide. Show Answer Correct Answer: D) Magnesium hydroxide. 56. Maternity has to do with being a ..... A) Father. B) Mother. C) Sister. D) Friend. Show Answer Correct Answer: B) Mother. 57. Write the formula for LiOH A) Monolithium oxy hydride. B) Lithium oxygen hydride. C) Lithium Hydroxide. D) Lithium oxide. Show Answer Correct Answer: C) Lithium Hydroxide. 58. In the DNA alphabet, T always pairs with: A) C. B) T. C) G. D) A. Show Answer Correct Answer: D) A. 59. Sodium hydroxide is a A) Weak base. B) Weak acid. C) Strong acid. D) Strong base. Show Answer Correct Answer: D) Strong base. 60. What is plaster of Paris? A) $ CASE 4 \\FRA {.1} {2} H2O $. B) $ Caocl_2 $. C) $CaSO_4.2H_2O$. D) $ Case_4 $. Show Answer Correct Answer: A) $ CASE 4 \\FRA {.1} {2} H2O $. ← PreviousNext →Related QuizzesScience QuizzesClass 7 QuizzesClass 7 Science Chapter 4 Bases Quiz 1Class 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 9 🏠 Back to Homepage 📘 Download PDF Books 📕 Premium PDF Books