161. Crystal structure of a material can be studied by:

1. 1. Electron microscopy

   
   
   

   2. X-ray diffraction

   
   
   

   3. Neutron-diffraction

   
   
   

   4. All of the above

   
   
   

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1. View Hint View Answer Discuss in Forum

   Crystal structure of a material can be studied by X-ray diffraction.

   Correct Option: B

   Crystal structure of a material can be studied by X-ray diffraction.

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162. Materials which are good conductors of both heat and electricity are:

1. 1. Metals

   
   
   

   2. Ceramics

   
   
   

   3. Polymers

   
   
   

   4. None of these

   
   
   

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1. View Hint View Answer Discuss in Forum

   Materials which are good conductor of heat and electricity are metals.

   Correct Option: A

   Materials which are good conductor of heat and electricity are metals.

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163. Thermoplastic and thermoset polymers differ in:

1. 1. Glass transition temperature

   
   
   

   2. Thermal behaviour

   
   
   

   3. Mechanical behaviour

   
   
   

   4. All of the above

   
   
   

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1. View Hint View Answer Discuss in Forum

   Thermoplastic and thermoset polymers differ in Thermal behaviour.

   Correct Option: B

   Thermoplastic and thermoset polymers differ in Thermal behaviour.

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164. An example of piezoelectric material is:

1. 1. Corundum

   
   
   

   2. Quartz

   
   
   

   3. BaTiO₃

   
   
   

   4. All of these

   
   
   

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1. View Hint View Answer Discuss in Forum

   Quartz is an example of piezoelectric material.

   Correct Option: B

   Quartz is an example of piezoelectric material.

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165. The permeability and permittivity of a medium are:

1. 1. independent to each other

   
   
   

   2. related by the velocity of EM waves

   
   
   

   3. related by the Boltzman constant

   
   
   

   4. All of the above

   
   
   

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1. View Hint View Answer Discuss in Forum

   The permeability and permittivity of a medium are related by the velocity of EM waves.

   Correct Option: B

   The permeability and permittivity of a medium are related by the velocity of EM waves.

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