Due to which of the following reasons aluminium does not corrode in atmosphere ?
A. Aluminium is a noble metal
B. Atmospheric oxygen can only diffuse very slowly through the oxide layer which is formed on the surface of aluminium
C. No reaction with oxygen occurs ft Any of the above
D. All of the above
Answer: Option B
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On which of the following factors does the resistivity of a material depend ?
A. Resistance of the conductor
B. Area of the conductor section
C. Length of the conductor
D. All of the above
Piezoelectric materials serve as a source of ________ .
A. Resonant waves
B. Musical waves
C. Microwaves
D. Ultrasonic waves
The tiny block formed by the arrangement of a small group of atoms is called the
A. Unit cell
B. Space lattice
C. Either A or B
D. None of the above
Aluminium does not corrode easily because it very reactive. It reacts with atmospheric oxygen to form a thin protective layer of aluminium oxide over it that prevents it from corrosion.