Question 29
Question 29 of 40
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No letter options?
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
Topics Tested
3. Waves
3.4. Sound

Know that the speed of sound in air is approximately 330–350m/s

3. Waves
3.3. Electromagnetic spectrum

Know that the speed of all electromagnetic waves in: (a) a vacuum is 3.0 × 10⁸ m/s (b) air is approximately the same as in a vacuum