TNPSC Group 1, 2 Physics Study Material in English and Tamil - 1

Question: 1

X-rays were discovered by ____

(A) Roentgen

(B) J.J. Thomson

(C) Neil Bohr

(D) Rutherford

Question: 2

The elliptical orbits of electron in the atom were proposed by ___

(A) De Broglie

(B) Sommerfeld

(C) Bohr

(D) J.J. Thomson

Question: 3

Who developed ruby laser?

(A) Moseley

(B) T. Maiman

(C) Huygens

(D) Roentgen

Question: 4

Laser beam is a _____

(A) Monochromatic coherent beam of light

(B) Monochromatic incoherent beam of light

(C) Beam of white light

(D) None of these

Question: 5

____ are used in endoscopy.

(A) Positive rays

(B) Laser beams

(C) Radioactive rays

(D) Cathode rays