Chemistry 1. (c); The most important form of elemental phosphorus from the perspective of applications and chemical literature is white phosphorus. It consists of tetrahedral P4 molecules, in which each atom is bound to other three atoms by a single…

PHYSICS 1. (c); Echo is a reflection of sound that arrives at the listener with a delay after the direct sound. The reflecting object must be more than 17m from the sound source for echo to be perceived by a…

1. (b) Explanation: The pattern is -21, -19, -17, -15… So, missing term = 113 – 15 = 98. 2. (c) Explanation: The digits are removed one by one from the beginning and the end in alternate order so as…