A. Silicon
B. Oxygen
C. Copper
D. Aluminum
Explanation: The most abundant metal in the Earth's crust is aluminum. It constitutes about 8.2% of the crust's mass, making it the most prevalent metal element.
A. Joule
B. Centigrade
C. Kelvin
D. Fahrenheit
A. Concave mirror
B. Convex mirror
C. Both
D. None of these
A. Tetrafluoroethene
B. Carbon dioxide
C. Methane
D. Nitrogen
Explanation: Liquid Ammonia and Tetrafluoroethene are used as Coolant in refrigerators.
A. Ammonia
B. Uric acid
C. Urea
D. None of these
A. Light
B. Energy
C. Waves
D. None of these
A. Sublimation
B. Evaporation
C. Condensation
D. None of these
A. Butane
B. Hexane
C. Propane
D. None of these
A. High energy
B. High frequency
C. Spectrum technology
D. None of these
A. Sulfur dioxide
B. Calcium oxalate
C. Aluminum oxide
D. None of these