| Consider the following sentences: |
| 1. In ordinary bulbs only 5% to 10% electrical energy is converted into light energy. |
| 2. Tungsten has very high melting point as \[3422{}^\circ C\] the filament of bulb is made of it. |
| 3. The mica has good electrical resistance. |
| 4. The electric bulb was first invented by Thomas Alva Edison. Which of the above statements are correct? |
A) 1 and 3
B) 3 and 4
C) All of these
D) None of these
Correct Answer: C
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