One of the conditions necessary for an object to be in equilibrium when acted upon by a number of parallel forces is that the vector sum of the forces is 

The ice point on the absolute scale of temperature is

Two plane mirrors are inclined at an angle of 20° to each other. Determine the number of images formed when an object is placed between them.

Gamma rays, ultraviolet rays, X-rays, infra-red rays

Infra-red rays, ultraviolet rays, X-rays, Gamma rays

Gamma rays, X-rays, ultraviolet rays, infra-red rays

Gamma rays, ultraviolet rays, infra-red rays, X-rays

Which of the following arrangements of the components of electromagnetic spectrum is in ascending order of wavelengths? 

Physics