engineering recuitment BSPHCL Technician (Electrician) 2024 Mock Test Electrician and Wireman Light and Illumination
Consider following statements about light:
(A) Light having wavelengths below 400 nm is infrared.
(B) Light having wavelengths above 700 nm is ultraviolet.
Then:
1
(A) is true and (B) is false
2
Both (A) and (B) are false
3
Both (A) and (B) are true
4
(B) is true and (A) is false