This document contains 85 multiple choice science questions covering topics such as biology, chemistry, physics and earth science. The questions range from identifying organelles and scientific terms to calculations involving speed, force and chemical reactions. The final question asks which substance cannot be decomposed into simpler substances, with the correct answer being aluminum.

1. Gr. 7 & 8
Science
Quiz contest

2. 1. Which organelle is known as “the
cell’s brain”?
a. Ribosome
b. Nucleus
c. Mitochondrion
d. Funny Bone

3. 2. Which of the following is not part of a
bacterial cell?
a. Nucleus
b. Protein
c. Ribosome
d. Cytoplasm

4. 3 . What is apoptosis?
a. A type of death that resembles suicide
b. The popping sound cells make when they
die
c. Type of cell division that produces daughter
cells
d. The type of cell death that occurs as the
result of traumatic injury or exposure to
toxic chemicals

5. 4 : The largest human cell (by volume) is the
egg.
a. True
b. False

6. 5. The nucleus of an atom consists of:
a. Electrons
b. Neutrons
c. protons and neutrons
d. protons, neutrons, and electrons

7. 6. An electron carries a _______.
positive charge

8. 7. Entomology is the scientific study of:
a. Internal organs
b. Birds
c. Insects
d. Trees
e. Lichens

9. 8. The green pigment found in plants that
performs photosynthesis is:
a. Melanin
b. Chloroplast
c. Chlorophyll
d. Chromatophore

10. 9. A proton has what electrical charge?
a. no charge
b. positive charge
c. negative charge
d. either a positive or negative charge

11. 10. The ozone layer protects us from too
much:
a. carbon dioxide
b. gamma radiation
c. ultraviolet radiation
d. temperature fluctuation

12. 11. Lizards belong to which animal group?
a. Amphibians
b. Reptiles
c. Invertebrates
d. mammals

13. 12. What is the 7th element on the periodic
table of elements?
 N

14. 13. True or false? DNA is the shortened form of
the term ‘Deoxyribonucleic acid’?

15. 14. Pure water has a pH level of a around?

16. 15. What is the name of the part of the human
skeleton which protects our brain?

17. 16. Is the compound ‘HCl’ an acid or base?

18. 17. These functions are all part of a
mechanism that allows the body to maintain
a balance between itself and the
environment. What is that mechanism
called?
a. Homeostasis
b. Metabolism
c. Osmosis
d. diffusion

19. 18. What is formed immediately after
fertilization occurs?
a. Sperm
b. Egg
c. Embryo
d. zygote

20. 19. Which is a chemical change?
a. melting an ice cube
b. dissolving sugar in boiling water
c. boiling an egg
d. crushing a can

21. 20) What is formed immediately after
fertilization occurs?
a. sperm
b. egg
c. embryo
d. zygote

22.  21. Mushrooms that grow on the sides of
trees in a forest ecosystem are best
classified by which of the following types of
organisms?
a.Consumers
b.Decomposers
c. Predators
d.Producers

23. 22. Fruit is derived from which part of the
flower?

24. 23.. Pollination involves the transfer of pollen
from
a. 5 to 1
b. 5 to 4
c. 5 to 3
d. 4 to 5
e. 4 to 1

25. 25. The parts of the male reproductive
structure of the flower are ____ and ____

26. 26. The petal of a flower is represented by

27. 27. Organisms that comprise the greatest
mass of living substance (biomass) in a
terrestrial food chain
a. Decomposers (e.g., bacteria)
b. Producers (e.g., grasses)
c. Primary consumers (e.g., mice)
d. Secondary consumers (e.g., snakes)
e. Tertiary consumers (e.g., hawks)

28.  28. Nitrogenous base that occurs in RNA
but not in DNA
a. Deoxyribose
b. Ribose
c. Uracil
d. Cytosine
e. Thymine

29. 29. What happens when two negatively charged
particles are next to each other?
a. The particles attract each other.
b. One particle becomes uncharged.
c. One particle becomes positively charged.
d. The particles repel each other

30. 30. The two types of prokaryotes are
__________ and ____________

31. 31. Which gas is monatomic at STP?
a. chlorine
b. fluorine
c. neon
d. nitrogen

32.  32. There are alternate acid base theories
that define an acid as any species that can
a. donate a proton
b. donate an electron
c. accept a proton
d. accept an electron

33.  33. An ion with 5 protons, 6 neutrons, and a
charge of 3+ has an atomic number of
a. 5
b. 6
c. 8
d. 11

34.  34. When a solid changes to a liquid it is
called what?
 Melting

35.  35. When a gas changes into a liquid it is
called ________

36.  36. What is it called when a solid changes
directly into a gas?

37.  37. What is the name given to substances
that are initially involved in a chemical
reaction?

38. 38. Atoms of the same chemical element that
have different atomic mass are known as?

39.  39. Another name for your voice box is the?

40.  40. The wind pipe in the reproductive system
is the _________

41.  41. The external layer of the skin of the body
is called ___________

42.  42. What is the human body’s biggest organ?

43.  43. Who was the first person to walk on the
moon?
 Neil Armstrong

44.  44. At room temperature, what is the only
metal that is in liquid form?

45.  45. Sound travels faster through water than
air.
 True

46.  46. What is the freezing temperature of
water?

47.  47. What is the largest ‘big cat’ in the world?
 Tiger

48. 48. What is the tallest animal in the world?
 Giraffe up to 6m

49.  49. Which famous scientist is the father of
inheritance?

50.  50. A person who studies about physics is
called ______________

51.  51. A person who studies about plants is
called _________________

52.  52. The SI unit of force is _____

53.  53. The unit of acceleration is ____

54.  54. Weight and mass are the same.

55.  55. There are ______ liters of blood in adult
human being.

56.  56. The study of heredity is called
_________________

57.  57. The two types of prokaryotes are
__________ and ____________

58.  58. Anything that has mass and occupies
space is called _______________.

59.  59. The average adult human skeleton has
_______ bones. 206

60.  60. The common pathway for the digestive
system and respiratory system

61.  61. The smallest, basic, structural and
functional unit of living things is called
a. cell
b. tissue
c. virus
d. bacteria

62.  62. The process that produces sex cells is
called
a. mitosis
b. meiosis
c. cell cycle
d. pedigree

63.  63. How many different types of amino acids
are there in nature?
 A) 15 B) 30 C) 60 D) 20

64.  64. All of the following are not found in
animal cells except
a. Cell wall
b. chloroplast
c. large vacuole
d. cell membrane

65.  65. The only liquid none metal is ___________

66.  66. The most abundant element in the human
body is ____
 o

67.  67. The most abundant element in the
universe is ____
 h

68.  68. The most abundant element in the earth’s
crust is ____
 o

69.  69. The largest part of the human brain is the
____

70.  70. The second most abundant element on
earth is ____
 Si

71.  71. The opposite of evaporation is
__________.
a. condensation
b. convection
c. radiation
d. conduction

72.  72. __________ is the thermal energy that
flows from a material with a higher
temperature to one with a lower
temperature.
a. Kinetic energy
b. Work
c. Heat
d. Potential energy

73.  73. Which is not a pure substance?
a. helium
b. copper wire
c. air
d. sucrose

74.  74. The atomic number is the
a. same as the mass number of an atom.
b. number of protons in a nucleus.
c. number of protons and neutrons in the
nucleus.
d. number of neutrons in a nucleus.

75.  75. A natural phenomenon that becomes
harmful due to pollution is _____________.

a. global warming
b. ecological balance
c. greenhouse effect
d. desertification

76.  76. The pollutant responsible for ozone holes
is ____________.
a. CO2
b. SO2
c. CO
d. CFC

77.  77. One of the best solutions to get rid of
non-biodegradable wastes is ______________
a. burning
b. dumping
c. burying
d. recycling

78.  78. Which of the following is only a physical
change? [7f-67]
a. magnesium burns brightly when heated
in air
b. marble chips fizz with acid
c. heating green copper carbonate powder
turns it black
d. when zinc oxide is heated it turns yellow,
on cooling it becomes white

79.  79. An athlete completes a 40 m race in 5
seconds. What is the average speed of the
athlete? [9k-74]
a. 9 m/s
b. 8 m/s
c. 200 m/s
d. 35 m/s

80.  80. The resultant of balanced forces is
________
a. non zero
b. equal to zero
c. not equal to zero
d. equal to the acceleration produced in the
body

81.  81. The physical quantity, which is the
measure of inertia, is ________
a. density
b. weight
c. force
d. mass

82.  82. The S.I. unit of force is
a. erg
b. joule
c. Newton
d. dyne

83.  83. What is the force acting on an object of
mass 10 kg moving with a uniform velocity of
10 m/s?
a. 100 N
b. 10 N
c. 0
d. 1 N

84.  84. The resultant of action and reaction
forces is _______.
a. greater than zero
b. less than zero
c. zero
d. none of the above

85.  85. Which substance cannot be decomposed
into simpler substances?
a. ammonia
b. aluminum
c. methane
d. methanol