Older MCQs might not have the typical A, B, C,
D
choices. They
have choices 1, 2, 3, and a combination of them is the answer. Below is the key that maps such
combinations to the answer.
A
1, 2 and 3 are correct
B
1 and 2 only are correct
C
2 and 3 only are correct
D
1 only is correct
Know that: (a) the Earth is a planet that orbits the Sun once in approximately 365 days (b) the orbit of the Earth around the Sun is an ellipse which is approximately circular (c) the Earth rotates on its axis, which is tilted, once in approximately 24 hours (d) it takes approximately one month for the Moon to orbit the Earth (e) it takes approximately 500s for light from the Sun to reach the Earth
State that the acceleration of free fall g for an object near to the surface of the Earth is approximately constant and is approximately 9.8 m/s²