146. Two electric fans p and 2 p watt respectively are connected in series. What is the power of the combination in watt ?

1. 1. p

   
   
   

   2. 3 p

   
   
   

   3. 2p / 3

   
   
   

   4. 3 p / 2

   
   
   

---

1. View Hint View Answer Discuss in Forum

   N/A

   Correct Option: C

   N/A

---

147. Indiscriminate disposal of used fluorescent electric lamps causes mercury pollution in the environment. Why is mercury used in the manufacture of these lamps?

1. 1. A mercury coating on the inside of the lamp makes the light bright white

   
   
   

   2. When the lamp is switched on, the mercury in the lamp causes the emission of ultra-violet radiations

   
   
   

   3. When the lamp is switched on, it is the mercury which converts the ultra-violet energy into visible light

   
   
   

   4. None of the statement given above is correct about the use of mercury in the manufacture of fluorescent lamps

   
   
   

---

1. View Hint View Answer Discuss in Forum

   N/A

   Correct Option: B

   N/A

---

---

148. A superconductor exhibits

1. 1. Paramagnetism

   
   
   

   2. Diamagnetism

   
   
   

   3. Ferromagnetism

   
   
   

   4. Ferrimagnetism

   
   
   

---

1. View Hint View Answer Discuss in Forum

   N/A

   Correct Option: B

   N/A

---

149. Which one of the following non-metals in not a poor conductor of electricity ?

1. 1. Sulphur

   
   
   

   2. Selenium

   
   
   

   3. Bromine

   
   
   

   4. Phosphorus

   
   
   

---

1. View Hint View Answer Discuss in Forum

   N/A

   Correct Option: B

   N/A

---

---

150. The deflection in moving coil galvanometer is

1. 1. Directly proportional to the torsional constant

   
   
   

   2. Inversely proportional to the area of the coil

   
   
   

   3. Inversely proportional to the current

   
   
   

   4. Directly proportional to the number of turns in the coil

   
   
   

---

1. View Hint View Answer Discuss in Forum

   N/A

   Correct Option: D

   N/A

---