Question 2:
Quartz used in clocks is ______
[RRB NTPC 19th April 2016 Shift 1]
A. Nitrogen Silicate
B. Silicon Dioxide
C. Sodium Silicate
D. Calcium Silicate
Answer:
B. Silicon Dioxide
Detailed Solution:
Quartz is a type of mineral that is mainly made of Silicon Dioxide (SiOâ‚‚). This mineral is special because it has a unique property called piezoelectricity.
Piezoelectricity means that when pressure is applied to quartz, it generates a small electrical charge. This property makes quartz very useful in clocks and watches. The tiny vibrations created by the quartz help keep time very accurately.
In a quartz clock, a battery sends electricity through a small piece of quartz. The quartz then vibrates back and forth at a steady rate. These vibrations are counted by the clock’s circuits, which turn them into the movement of the clock’s hands or the changing of numbers on a digital display.
So, the correct answer is B. Silicon Dioxide, which is the chemical name for quartz used in clocks.
