Question and answer list
Each item is a 4-option MCQ. Open a question, tap A–D. Green is correct, red is wrong. Original US classroom practice — not a state test copy.
1. Biodiversity means
Tap A, B, C or D.
Answer: A) variety of life in an ecosystem
More diversity often means more resilience.
2. A carbon sink
Tap A, B, C or D.
Answer: A) stores more carbon than it releases, like a healthy forest
Oceans and forests can act as sinks.
3. Eutrophication is often caused by
Tap A, B, C or D.
Answer: B) excess fertilizer runoff that overfeeds algae
Algal blooms can steal oxygen when they decay.
4. An invasive species
Tap A, B, C or D.
Answer: C) spreads in a new habitat and can harm natives
Zebra mussels in the Great Lakes are a US example.
5. Renewable energy examples include
Tap A, B, C or D.
Answer: A) wind, solar, and hydro
They replenish on a human timescale.
6. The ozone layer
Tap A, B, C or D.
Answer: B) blocks much harmful UV from the Sun
Stratospheric ozone is helpful; ground-level ozone is a pollutant.
7. A keystone species
Tap A, B, C or D.
Answer: D) has an outsized effect on its ecosystem
Sea otters and wolves are textbook cases.
8. Grade 12 science — environmental: practice check 1 — the reliable next step is
Tap A, B, C or D.
Answer: C) try the item, then read the tip
Original GKSchools practice — not a state exam leak. Come back tomorrow; order rotates.
9. Grade 12 science — environmental: practice check 2 — the reliable next step is
Tap A, B, C or D.
Answer: C) try the item, then read the tip
Original GKSchools practice — not a state exam leak. Come back tomorrow; order rotates.
10. Grade 12 science — environmental: practice check 3 — the reliable next step is
Tap A, B, C or D.
Answer: C) try the item, then read the tip
Original GKSchools practice — not a state exam leak. Come back tomorrow; order rotates.
11. Grade 12 science — environmental: practice check 4 — the reliable next step is
Tap A, B, C or D.
Answer: D) try the item, then read the tip
Original GKSchools practice — not a state exam leak. Come back tomorrow; order rotates.
12. Grade 12 science — environmental: practice check 5 — the reliable next step is
Tap A, B, C or D.
Answer: D) try the item, then read the tip
Original GKSchools practice — not a state exam leak. Come back tomorrow; order rotates.
13. Grade 12 science — environmental: practice check 6 — the reliable next step is
Tap A, B, C or D.
Answer: D) try the item, then read the tip
Original GKSchools practice — not a state exam leak. Come back tomorrow; order rotates.
14. Grade 12 science — environmental: practice check 7 — the reliable next step is
Tap A, B, C or D.
Answer: D) try the item, then read the tip
Original GKSchools practice — not a state exam leak. Come back tomorrow; order rotates.
15. Grade 12 science — environmental: practice check 8 — the reliable next step is
Tap A, B, C or D.
Answer: B) try the item, then read the tip
Original GKSchools practice — not a state exam leak. Come back tomorrow; order rotates.
16. Grade 12 science — environmental: practice check 9 — the reliable next step is
Tap A, B, C or D.
Answer: B) try the item, then read the tip
Original GKSchools practice — not a state exam leak. Come back tomorrow; order rotates.
17. Grade 12 science — environmental: practice check 10 — the reliable next step is
Tap A, B, C or D.
Answer: D) try the item, then read the tip
Original GKSchools practice — not a state exam leak. Come back tomorrow; order rotates.
18. Grade 12 science — environmental: practice check 11 — the reliable next step is
Tap A, B, C or D.
Answer: D) try the item, then read the tip
Original GKSchools practice — not a state exam leak. Come back tomorrow; order rotates.
19. Grade 12 science — environmental: practice check 12 — the reliable next step is
Tap A, B, C or D.
Answer: D) try the item, then read the tip
Original GKSchools practice — not a state exam leak. Come back tomorrow; order rotates.
20. Grade 12 science — environmental: practice check 13 — the reliable next step is
Tap A, B, C or D.
Answer: D) try the item, then read the tip
Original GKSchools practice — not a state exam leak. Come back tomorrow; order rotates.
21. Grade 12 science — environmental: practice check 14 — the reliable next step is
Tap A, B, C or D.
Answer: C) try the item, then read the tip
Original GKSchools practice — not a state exam leak. Come back tomorrow; order rotates.
22. Grade 12 science — environmental: practice check 15 — the reliable next step is
Tap A, B, C or D.
Answer: C) try the item, then read the tip
Original GKSchools practice — not a state exam leak. Come back tomorrow; order rotates.
23. Grade 12 science — environmental: practice check 16 — the reliable next step is
Tap A, B, C or D.
Answer: C) try the item, then read the tip
Original GKSchools practice — not a state exam leak. Come back tomorrow; order rotates.
24. Grade 12 science — environmental: practice check 17 — the reliable next step is
Tap A, B, C or D.
Answer: C) try the item, then read the tip
Original GKSchools practice — not a state exam leak. Come back tomorrow; order rotates.
25. Grade 12 science — environmental: practice check 18 — the reliable next step is
Tap A, B, C or D.
Answer: A) try the item, then read the tip
Original GKSchools practice — not a state exam leak. Come back tomorrow; order rotates.
26. Grade 12 science — environmental: practice check 19 — the reliable next step is
Tap A, B, C or D.
Answer: A) try the item, then read the tip
Original GKSchools practice — not a state exam leak. Come back tomorrow; order rotates.
27. Grade 12 science — environmental: practice check 20 — the reliable next step is
Tap A, B, C or D.
Answer: B) try the item, then read the tip
Original GKSchools practice — not a state exam leak. Come back tomorrow; order rotates.
28. Grade 12 science — environmental: practice check 21 — the reliable next step is
Tap A, B, C or D.
Answer: B) try the item, then read the tip
Original GKSchools practice — not a state exam leak. Come back tomorrow; order rotates.
29. Grade 12 science — environmental: practice check 22 — the reliable next step is
Tap A, B, C or D.
Answer: B) try the item, then read the tip
Original GKSchools practice — not a state exam leak. Come back tomorrow; order rotates.
30. Grade 12 science — environmental: practice check 23 — the reliable next step is
Tap A, B, C or D.
Answer: B) try the item, then read the tip
Original GKSchools practice — not a state exam leak. Come back tomorrow; order rotates.
31. Grade 12 science — environmental: practice check 24 — the reliable next step is
Tap A, B, C or D.
Answer: A) try the item, then read the tip
Original GKSchools practice — not a state exam leak. Come back tomorrow; order rotates.
32. Grade 12 science — environmental: practice check 25 — the reliable next step is
Tap A, B, C or D.
Answer: A) try the item, then read the tip
Original GKSchools practice — not a state exam leak. Come back tomorrow; order rotates.
33. Grade 12 science — environmental: practice check 26 — the reliable next step is
Tap A, B, C or D.
Answer: A) try the item, then read the tip
Original GKSchools practice — not a state exam leak. Come back tomorrow; order rotates.
34. Grade 12 science — environmental: practice check 27 — the reliable next step is
Tap A, B, C or D.
Answer: A) try the item, then read the tip
Original GKSchools practice — not a state exam leak. Come back tomorrow; order rotates.
35. Grade 12 science — environmental: practice check 28 — the reliable next step is
Tap A, B, C or D.
Answer: C) try the item, then read the tip
Original GKSchools practice — not a state exam leak. Come back tomorrow; order rotates.
36. Grade 12 science — environmental: practice check 29 — the reliable next step is
Tap A, B, C or D.
Answer: C) try the item, then read the tip
Original GKSchools practice — not a state exam leak. Come back tomorrow; order rotates.
37. Grade 12 science — environmental: practice check 30 — the reliable next step is
Tap A, B, C or D.
Answer: A) try the item, then read the tip
Original GKSchools practice — not a state exam leak. Come back tomorrow; order rotates.
38. Grade 12 science — environmental: practice check 31 — the reliable next step is
Tap A, B, C or D.
Answer: A) try the item, then read the tip
Original GKSchools practice — not a state exam leak. Come back tomorrow; order rotates.
39. Grade 12 science — environmental: practice check 32 — the reliable next step is
Tap A, B, C or D.
Answer: A) try the item, then read the tip
Original GKSchools practice — not a state exam leak. Come back tomorrow; order rotates.
40. Grade 12 science — environmental: practice check 33 — the reliable next step is
Tap A, B, C or D.
Answer: A) try the item, then read the tip
Original GKSchools practice — not a state exam leak. Come back tomorrow; order rotates.
41. Grade 12 science — environmental: practice check 34 — the reliable next step is
Tap A, B, C or D.
Answer: B) try the item, then read the tip
Original GKSchools practice — not a state exam leak. Come back tomorrow; order rotates.
42. Grade 12 science — environmental: practice check 35 — the reliable next step is
Tap A, B, C or D.
Answer: B) try the item, then read the tip
Original GKSchools practice — not a state exam leak. Come back tomorrow; order rotates.
43. Grade 12 science — environmental: practice check 36 — the reliable next step is
Tap A, B, C or D.
Answer: B) try the item, then read the tip
Original GKSchools practice — not a state exam leak. Come back tomorrow; order rotates.
44. Grade 12 science — environmental: practice check 37 — the reliable next step is
Tap A, B, C or D.
Answer: B) try the item, then read the tip
Original GKSchools practice — not a state exam leak. Come back tomorrow; order rotates.
45. Grade 12 science — environmental: practice check 38 — the reliable next step is
Tap A, B, C or D.
Answer: D) try the item, then read the tip
Original GKSchools practice — not a state exam leak. Come back tomorrow; order rotates.
46. Grade 12 science — environmental: practice check 39 — the reliable next step is
Tap A, B, C or D.
Answer: D) try the item, then read the tip
Original GKSchools practice — not a state exam leak. Come back tomorrow; order rotates.
47. Grade 12 science — environmental: practice check 40 — the reliable next step is
Tap A, B, C or D.
Answer: B) try the item, then read the tip
Original GKSchools practice — not a state exam leak. Come back tomorrow; order rotates.
48. Grade 12 science — review physics: practice check 91 — the reliable next step is
Tap A, B, C or D.
Answer: B) try the item, then read the tip
Original GKSchools practice — not a state exam leak. Come back tomorrow; order rotates.
49. Grade 12 science — review physics: practice check 92 — the reliable next step is
Tap A, B, C or D.
Answer: B) try the item, then read the tip
Original GKSchools practice — not a state exam leak. Come back tomorrow; order rotates.
50. A wave’s frequency is
Tap A, B, C or D.
Answer: D) how many cycles occur per second (hertz)
f = 1/T.
51. The relationship v = fλ means
Tap A, B, C or D.
Answer: B) wave speed equals frequency times wavelength
In air, sound is much slower than light.
52. In a series circuit, current is
Tap A, B, C or D.
Answer: C) the same through each resistor
Voltage drops add to the battery voltage.
53. In a parallel circuit, voltage across each branch is
Tap A, B, C or D.
Answer: C) the same as the source (ideal wires)
Currents in the branches add.
54. Ohm’s law is
Tap A, B, C or D.
Answer: A) V = IR
Voltage, current, resistance.
55. Momentum is
Tap A, B, C or D.
Answer: B) mass times velocity (p = mv)
It is conserved in a closed system with no external impulse.
56. A transverse wave’s oscillations are
Tap A, B, C or D.
Answer: B) perpendicular to the direction of travel
Light and string waves are transverse.
57. Sound is a
Tap A, B, C or D.
Answer: D) longitudinal mechanical wave
It needs a medium; light does not.
58. Grade 12 science — review physics: practice check 1 — the reliable next step is
Tap A, B, C or D.
Answer: B) try the item, then read the tip
Original GKSchools practice — not a state exam leak. Come back tomorrow; order rotates.
59. Grade 12 science — review physics: practice check 2 — the reliable next step is
Tap A, B, C or D.
Answer: B) try the item, then read the tip
Original GKSchools practice — not a state exam leak. Come back tomorrow; order rotates.
60. Grade 12 science — review physics: practice check 3 — the reliable next step is
Tap A, B, C or D.
Answer: B) try the item, then read the tip
Original GKSchools practice — not a state exam leak. Come back tomorrow; order rotates.
61. Grade 12 science — review physics: practice check 4 — the reliable next step is
Tap A, B, C or D.
Answer: A) try the item, then read the tip
Original GKSchools practice — not a state exam leak. Come back tomorrow; order rotates.
62. Grade 12 science — review physics: practice check 5 — the reliable next step is
Tap A, B, C or D.
Answer: A) try the item, then read the tip
Original GKSchools practice — not a state exam leak. Come back tomorrow; order rotates.
63. Grade 12 science — review physics: practice check 6 — the reliable next step is
Tap A, B, C or D.
Answer: A) try the item, then read the tip
Original GKSchools practice — not a state exam leak. Come back tomorrow; order rotates.
64. Grade 12 science — review physics: practice check 7 — the reliable next step is
Tap A, B, C or D.
Answer: A) try the item, then read the tip
Original GKSchools practice — not a state exam leak. Come back tomorrow; order rotates.
65. Grade 12 science — review physics: practice check 8 — the reliable next step is
Tap A, B, C or D.
Answer: C) try the item, then read the tip
Original GKSchools practice — not a state exam leak. Come back tomorrow; order rotates.
66. Grade 12 science — review physics: practice check 9 — the reliable next step is
Tap A, B, C or D.
Answer: C) try the item, then read the tip
Original GKSchools practice — not a state exam leak. Come back tomorrow; order rotates.
67. Grade 12 science — review physics: practice check 10 — the reliable next step is
Tap A, B, C or D.
Answer: D) try the item, then read the tip
Original GKSchools practice — not a state exam leak. Come back tomorrow; order rotates.
68. Grade 12 science — review physics: practice check 11 — the reliable next step is
Tap A, B, C or D.
Answer: D) try the item, then read the tip
Original GKSchools practice — not a state exam leak. Come back tomorrow; order rotates.
69. Grade 12 science — review physics: practice check 12 — the reliable next step is
Tap A, B, C or D.
Answer: D) try the item, then read the tip
Original GKSchools practice — not a state exam leak. Come back tomorrow; order rotates.
70. Grade 12 science — review physics: practice check 13 — the reliable next step is
Tap A, B, C or D.
Answer: D) try the item, then read the tip
Original GKSchools practice — not a state exam leak. Come back tomorrow; order rotates.
71. Grade 12 science — review physics: practice check 14 — the reliable next step is
Tap A, B, C or D.
Answer: C) try the item, then read the tip
Original GKSchools practice — not a state exam leak. Come back tomorrow; order rotates.
72. Grade 12 science — review physics: practice check 15 — the reliable next step is
Tap A, B, C or D.
Answer: C) try the item, then read the tip
Original GKSchools practice — not a state exam leak. Come back tomorrow; order rotates.
73. Grade 12 science — review physics: practice check 16 — the reliable next step is
Tap A, B, C or D.
Answer: C) try the item, then read the tip
Original GKSchools practice — not a state exam leak. Come back tomorrow; order rotates.
74. Grade 12 science — review physics: practice check 17 — the reliable next step is
Tap A, B, C or D.
Answer: C) try the item, then read the tip
Original GKSchools practice — not a state exam leak. Come back tomorrow; order rotates.
75. Grade 12 science — review physics: practice check 18 — the reliable next step is
Tap A, B, C or D.
Answer: A) try the item, then read the tip
Original GKSchools practice — not a state exam leak. Come back tomorrow; order rotates.
76. Grade 12 science — review physics: practice check 19 — the reliable next step is
Tap A, B, C or D.
Answer: A) try the item, then read the tip
Original GKSchools practice — not a state exam leak. Come back tomorrow; order rotates.
77. Grade 12 science — review physics: practice check 20 — the reliable next step is
Tap A, B, C or D.
Answer: B) try the item, then read the tip
Original GKSchools practice — not a state exam leak. Come back tomorrow; order rotates.
78. Grade 12 science — review physics: practice check 21 — the reliable next step is
Tap A, B, C or D.
Answer: B) try the item, then read the tip
Original GKSchools practice — not a state exam leak. Come back tomorrow; order rotates.
79. Grade 12 science — review physics: practice check 22 — the reliable next step is
Tap A, B, C or D.
Answer: B) try the item, then read the tip
Original GKSchools practice — not a state exam leak. Come back tomorrow; order rotates.
80. Grade 12 science — review physics: practice check 23 — the reliable next step is
Tap A, B, C or D.
Answer: B) try the item, then read the tip
Original GKSchools practice — not a state exam leak. Come back tomorrow; order rotates.
81. Grade 12 science — review physics: practice check 24 — the reliable next step is
Tap A, B, C or D.
Answer: A) try the item, then read the tip
Original GKSchools practice — not a state exam leak. Come back tomorrow; order rotates.
82. Grade 12 science — review physics: practice check 25 — the reliable next step is
Tap A, B, C or D.
Answer: A) try the item, then read the tip
Original GKSchools practice — not a state exam leak. Come back tomorrow; order rotates.
83. Grade 12 science — review physics: practice check 26 — the reliable next step is
Tap A, B, C or D.
Answer: A) try the item, then read the tip
Original GKSchools practice — not a state exam leak. Come back tomorrow; order rotates.
84. Grade 12 science — review physics: practice check 27 — the reliable next step is
Tap A, B, C or D.
Answer: A) try the item, then read the tip
Original GKSchools practice — not a state exam leak. Come back tomorrow; order rotates.
85. Grade 12 science — review physics: practice check 28 — the reliable next step is
Tap A, B, C or D.
Answer: C) try the item, then read the tip
Original GKSchools practice — not a state exam leak. Come back tomorrow; order rotates.
86. Grade 12 science — review physics: practice check 29 — the reliable next step is
Tap A, B, C or D.
Answer: C) try the item, then read the tip
Original GKSchools practice — not a state exam leak. Come back tomorrow; order rotates.
87. Grade 12 science — review physics: practice check 30 — the reliable next step is
Tap A, B, C or D.
Answer: A) try the item, then read the tip
Original GKSchools practice — not a state exam leak. Come back tomorrow; order rotates.
88. Grade 12 science — review physics: practice check 31 — the reliable next step is
Tap A, B, C or D.
Answer: A) try the item, then read the tip
Original GKSchools practice — not a state exam leak. Come back tomorrow; order rotates.
89. Grade 12 science — review physics: practice check 32 — the reliable next step is
Tap A, B, C or D.
Answer: A) try the item, then read the tip
Original GKSchools practice — not a state exam leak. Come back tomorrow; order rotates.
90. Grade 12 science — review physics: practice check 33 — the reliable next step is
Tap A, B, C or D.
Answer: A) try the item, then read the tip
Original GKSchools practice — not a state exam leak. Come back tomorrow; order rotates.
91. Grade 12 science — review physics: practice check 34 — the reliable next step is
Tap A, B, C or D.
Answer: B) try the item, then read the tip
Original GKSchools practice — not a state exam leak. Come back tomorrow; order rotates.
92. Grade 12 science — review physics: practice check 35 — the reliable next step is
Tap A, B, C or D.
Answer: B) try the item, then read the tip
Original GKSchools practice — not a state exam leak. Come back tomorrow; order rotates.
93. Grade 12 science — review physics: practice check 36 — the reliable next step is
Tap A, B, C or D.
Answer: B) try the item, then read the tip
Original GKSchools practice — not a state exam leak. Come back tomorrow; order rotates.
94. Grade 12 science — review physics: practice check 37 — the reliable next step is
Tap A, B, C or D.
Answer: B) try the item, then read the tip
Original GKSchools practice — not a state exam leak. Come back tomorrow; order rotates.
95. Grade 12 science — review physics: practice check 38 — the reliable next step is
Tap A, B, C or D.
Answer: D) try the item, then read the tip
Original GKSchools practice — not a state exam leak. Come back tomorrow; order rotates.
96. Grade 12 science — review physics: practice check 39 — the reliable next step is
Tap A, B, C or D.
Answer: D) try the item, then read the tip
Original GKSchools practice — not a state exam leak. Come back tomorrow; order rotates.
97. Grade 12 science — review physics: practice check 40 — the reliable next step is
Tap A, B, C or D.
Answer: B) try the item, then read the tip
Original GKSchools practice — not a state exam leak. Come back tomorrow; order rotates.
98. Grade 12 science — review physics: practice check 41 — the reliable next step is
Tap A, B, C or D.
Answer: B) try the item, then read the tip
Original GKSchools practice — not a state exam leak. Come back tomorrow; order rotates.
99. Grade 12 science — review physics: practice check 42 — the reliable next step is
Tap A, B, C or D.
Answer: B) try the item, then read the tip
Original GKSchools practice — not a state exam leak. Come back tomorrow; order rotates.
100. Grade 12 science — review physics: practice check 43 — the reliable next step is
Tap A, B, C or D.
Answer: B) try the item, then read the tip
Original GKSchools practice — not a state exam leak. Come back tomorrow; order rotates.
