(A) Electromagnetic
(B) Heat
(C) Sound
(D) Light
Author:
The phenomenon of light associated with the appearance of blue colour of the sky is?
(A) Refraction
(B) Reflection
(C) Interference
(D) Scattering
Which layer of the earth atmosphere reflect back the radio waves to earth surface?
(A) Stratosphere
(B) Ionosphere
(C) Mesosphere
(D) Exosphere
Coolis tube is used to produce?
(A) Gama rays
(B) X-rays
(C) Micro waves
(D) Radio waves
Remote sensing device has an inbuilt source of?
(A) Ultraviolet ray
(B) Infrared ray
(C) g-ray
(D) X-ray
Which apparatus is used to locate a submerged object?
(A) Quasar
(B) Pulsar
(C) Radar
(D) Sonar
Which wave is used for communication by artificial satellites?
(A) Frequency of 1016 series
(B) A.M
(C) Radio Waves
(D) Micro Waves