GCSE Physics Question Analyses Topic: Physics - Multiple Choice
Exam Questions:
1. A welder wears special glasses to protect his eyes mostly from the harmful effect of
A) Very intense visible light
B) infrared radiation
C) ultraviolet rays
D) microwaves.
2. In an n-type semiconductor, the donor energy level lies
A) at the centre of the energy gap
B) just below the conduction band.
C) just above the valence band.
D) in the conduction band.
Answer:
For GCSE Physics, you should know:
1) Ultraviolet rays, which are not visible but have a strong impact on the eyes, are created during the welding process. In order to safeguard his eyes, the welder uses the protective glass. Hence, the answer is C - ultraviolet rays.
2) The donor energy level in an n-type semi conductor is located very close to the fermi-level of the semi conductor, right below the conduction band. As a result, the answer is B - just below the conduction band.
Work hard for your GCSE Physics examination!
End of analysis. Great!
