41. 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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42. 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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43. 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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44. The dielectric strength of impregnated paper is:

1. 1. 40–50 kV/cm

   
   
   

   2. 200–300 kV/cm

   
   
   

   3. 500–600 kV/cm

   
   
   

   4. 1000 kV/cm and above

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: A

   NA

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45. Covalent bond-energy in Ge is approximately equal to:

1. 1. 7.4 eV

   
   
   

   2. 31 eV

   
   
   

   3. 3.4 eV

   
   
   

   4. 20.4 eV

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: A

   NA

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