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Class 7 Science Chapter 4 Bases Quiz 3 (60 MCQs)

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1. Adenine, Cytosine, Guanine and Thymine are examples of
2. Type of substance that when dissociating produces an oh-ions
3. Hydrochloric acid produces ..... salts
4. What is the pH range of a neutral solution?
5. Koh is a name base:
6. DNA directs the synthesis of
7. The smallest part of an element is
8. Select the name of the following acid:HF
9. A solution has a pH of 6.2, if its hydrogen ion concentration is decreased by 100 times, what would its new pH be?
10. What does Latin root ambi mean?
11. A student measures the pH of a substance using pH paper. It turns a dark blue and is determined to have a pH of 13. Which of the following best describes this substance?
12. A substance that is corrosive to metals
13. The rules of DNA pairing states that Adenine (A) always pairs up with
14. The root fin (from Latin) means "end." So we've come to the end of this song, the finale.Finally, can you see how much you've learned about roots?If the prefix "in-" means "not, " what is the definition of "infinite" ?
15. Lily investigates the relative stability of phosphoric acid and citric acid. She adds phosphoric acid in test tube X and citric acid in test tube Y. A piece of magnesium is then added to each tube. State the observation in each.
16. What is the meaning of the Greek base 'micro'?
17. What is the percentage of water vapor in the air
18. How do acid base indicators work?
19. Which of the following bases is not found in DNA?
20. The latin root bene means-
21. When an acid reacts with a base, what are the products formed?
22. A nucleotide is the building block of:
23. Distilled water has a pH
24. Name the following compound H$_{2}$Se
25. What is present in aqueous solutions of an acid or alkali that allow them to conduct electricity?
26. "limewater turns milky" is a test for which gas?
27. If there is 22% Cytosine, how much of all the other bases are there?
28. Is the following substance an acid or a base? H2(SO4)
29. What is the positive ion in the following formula?H $ _ {2} $ s
30. The FULL NAME of the letter T from the DNA alphabet is:
31. A strong alkali dissociates more than what percentage of its molecules in water?
32. 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.
33. In a DNA double helix, adenine pairs with which other base?
34. What is the significance of complementary base pairing in DNA replication?
35. What base pairs with thymine?
36. Is the following substance an acid or a base? KOH
37. A substance that is caustic
38. 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
39. What is the role of nitrogen bases in DNA?
40. What is the colour of universal indicator in a solution of pH 4?
41. 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
42. Which base is used in the neutralization of acids in wastewater treatment?
43. A neutralization reaction will (almost) always produce .....
44. If the pOH of a solution is 2.8 what is the pH?
45. Base is a substance that does not have hydrogen in its composition.This statement is:
46. If you have a solution that is very acidic with a pH of 3.5, what can you do to raise the pH of the solution?
47. Which of the following is a common use of bases in everyday life?
48. What are the four nitrogen bases found in RNA?
49. If a solution is acidic, and you are using the indicator methyl orange, what color would you see?
50. If you were testing what might affect the rate of dissolving of sugar, you could test the affect of agitation (shaking, stirring, etc). Which of the following BEST explains how this will change how fast the solute will dissolve.
51. Which pH represents the solution with the highest Hydrogen ion concentration
52. What is the molarity of a 30 mL HCl which is neutralized by 48 mL of 0.1 M NaOH?HCl + NaOH $\rightarrow$ H$_{2}$O + NaCl
53. What does the Latin root circum mean?
54. What is a database or database management system (SGBD)?
55. Lime water changes the colour of blue litmus paper to
56. In what ways is RNA different to DNA?
57. What is the formula of hydrogen?
58. All bases have what ion?
59. Which of these characteristics has an acid
60. The root word graph (from Greek) means "to write" or "to draw." When you take a photograph, you're "writing down, " or recording, an image.A piece of writing might be accompanied by an illustration, or a graphic.The root word "choreo" means "to dance." What does "choreograph" mean?
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