Question

Which of the following statements is/are correct?

• A. Limestone and mica are used to make cement.
  
• B. Non-metals are usually bad conductors of electricity.
  
• C. Coal is used in the process of electricity generation.
  
• D. Mica is used extensively in the electrical industry.
  

Answer 1

Answer: (B), (C), (D)

The correct options are
B Non-metals are usually bad conductors of electricity.

C Coal is used in the process of electricity generation.

D Mica is used extensively in the electrical industry.


Limestone and gypsum are used to manufacture cement. Mica is extensively used in the electrical industry. It is a non-metal and thus acts as a good insulator (bad conductor of electricity). Electricity generated with the help of coal is called Thermal Power. One of the most important uses of coal is to generate electricity in thermal power stations.