X_rays were discovered by __________
(A) Wilhelm Conrad Roentgen
(B) Thomson
(C) Ernest Rutherford
(D) Bacquerel
The sun is containing _______ % mass of the solar system
(A) 75.24%
(B) 79.36%
(C) 89.10%
(D) 99.86%
Sun is moving around the centre of the galaxy at a velocity of _______ km/s
(A) 205
(B) 210
(C) 215
(D) 220
The horizontal rows of the periodic table are called ______
(A) Groups
(B) Periods
(C) Sets
(D) Matrices
Battery was invented by__________
(A) Nicolas Léonard Sadi Carnot
(B) Alessandro Volta
(C) Michael Faraday
(D) Friedrich Bessel