The waves used by artificial satellites for communication is
A. microwaves
B. infrared waves
C. radio waves
D. X-rays
Answer: Option A
A. microwaves
B. infrared waves
C. radio waves
D. X-rays
Answer: Option A
Which of the following are not commercially manufactured by powder metallurgy
A. Aircraft brake pads
B. Self-lubricating bearings
C. Tungsten carbide based cutting tools
D. Turbine blades
A. 10 degrees
B. 21 degrees
C. 30 degrees
D. 50 degrees
Which crystal system does not have all axial angles at 90 degrees?
A. Tetragonal
B. rhombohedral
C. orthorhombic
D. cubic
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