Question 33
Question 33 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

Describe the production of sound by vibrating sources

4. Electricity and magnet...
4.5.3. Magnetic effect of a current

Describe how the magnetic effect of a current is used in relays and loudspeakers and give examples of their application