261. In germanium atom, high energy is carried by electrons in the:

1. 1. innermost shell

   
   
   

   2. outermost shell

   
   
   

   3. second shell

   
   
   

   4. third shell

   
   
   

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   In germanium atom, high energy is carried by electrons in the outermost shell.

   Correct Option: B

   In germanium atom, high energy is carried by electrons in the outermost shell.

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262. A material has forbidden energy gap E_g = 1 eV, between valence and conduction bands. Such a material will behave as:

1. 1. a good conductor

   
   
   

   2. an insulator

   
   
   

   3. a semiconductor

   
   
   

   4. a varactor

   
   
   

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   NA

   Correct Option: B

   NA

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263. A resistor with negative temperature coefficient is called as a:

1. 1. potentiometer

   
   
   

   2. thermistor

   
   
   

   3. phototransistor

   
   
   

   4. varactor

   
   
   

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   A resistor with negative temperature coefficient is called as the thermistor.

   Correct Option: B

   A resistor with negative temperature coefficient is called as the thermistor.

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264. With increase in temperature, the mean free path:

1. 1. decreases

   
   
   

   2. increases

   
   
   

   3. remains unchanged

   
   
   

   4. vanishes

   
   
   

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   With increase in temperature, the mean free path decreases.

   Correct Option: A

   With increase in temperature, the mean free path decreases.

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265. In an imperfection free crystal, the resistivity will be:

1. 1. infinite

   
   
   

   2. zero

   
   
   

   3. negative

   
   
   

   4. unity

   
   
   

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1. View Hint View Answer Discuss in Forum

   In an imperfection free crystal, the resistivity will be zero.

   Correct Option: B

   In an imperfection free crystal, the resistivity will be zero.

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