The blueness of the sky is mainly due to _____________?
A. The scattering of sunlight by air molecules
B. The presence of water vapor
C. Absorption of blue light by the air
D. Emission of blue light by the atmosphere
A. Opthalmology
B. Obstetrics
C. Physiology
D. Haematology
Basha Dam is to be constructed on___________?
A. River Sutlaj
B. River Jhelum
C. River Chenab
D. None (On Indus River in Gilgit-Baltistan)
A. Motor.
B. Transformer.
C. Coil.
D. Generator.
A. oxygen and hydrogen
B. oxygen, hydrogen, acetylene and nitrogen
C. oxygen, acetylene and argon
D. oxygen and acetylene
Melanoma (skin cancer) is associated with ______________?
A. ozone accumulation
B. ozone depletion
C. acid rain
D. allergens
A. 26
B. 27
C. 28
D. 30