166. The resistivity of all normal metals:

1. 1. tends to zero

   
   
   

   2. tends to constant value

   
   
   

   3. first decreases and then increases as temperature is lowered

   
   
   

   4. None of the above

   
   
   

---

1. View Hint View Answer Discuss in Forum

   The resistivity of all normal metals tends to zero.

   Correct Option: A

   The resistivity of all normal metals tends to zero.

---

167. Resistivity of electrical conductors is most affected by:

1. 1. temperature

   
   
   

   2. pressure

   
   
   

   3. humidity

   
   
   

   4. All of these

   
   
   

---

1. View Hint View Answer Discuss in Forum

   The resistivity of electrical conductors is most affected by temperature.

   Correct Option: A

   The resistivity of electrical conductors is most affected by temperature.

---

---

168. 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

   
   
   

---

1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: A

   NA

---

169. The maximum working voltage for a paper capacitor is:

1. 1. 500 V

   
   
   

   2. 1000 V

   
   
   

   3. 230 V

   
   
   

   4. 5000 V

   
   
   

---

1. View Hint View Answer Discuss in Forum

   The maximum working voltage for a paper capacitor is 1000 V.

   Correct Option: B

   The maximum working voltage for a paper capacitor is 1000 V.

---

---

170. 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

   
   
   

---

1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: A

   NA

---