1. X-rays were discovered in __________
(A) 1885
(B) 1905
(C) 1895
(D) 1915
2. X-ray picture is called a __________
(A) Photograph
(B) Radiograph
(C) Sonograph
(D) Sketch
3. X-rays are __________ radiations
(A) Acoustic
(B) Gamma radiations
(C) Electromagnetic
(D) Beta rays
4. X-rays propagate with a speed of __________
(A) 3×10¹⁰ cm/s
(B) 3×10¹² cm/s
(C) 4×10¹⁰ cm/s
(D) 4×10¹² cm/s
5. In X-ray machine, high voltage generator produces an output approximately ________
(A) 50 kV
(B) 60 kV
(C) 125 kV
(D) 225 kV