I. Alpha rays
II. Beta rays
III. Gamma rays
A. I only
B. II only
C. III only
D. II and III only
E. I, II and III
Correct Answer:
Option D – II and III only
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![A beam PQ pivoted at P carries a load of 80N as shown above. Calculate the effort E, required to keep it horizontal. [neglect the weight of the beam]](https://myschool.ng/storage/classroom/4288835607_maths-15.jpg "A beam PQ pivoted at P carries a load of 80N as shown above. Calculate the effort E, required to keep it horizontal. [neglect the weight of the beam]")
