A transformer of 100% efficiency has 200 turns in the primary coil and 40000 turns in secondary coil. It is connected to a 220 V main supply and secondary feeds to a 100 kΩ resistance. The potential difference per turn is
 
1.  1.1 V
 
2.  25 V
 
3.  18 V
 
4.  11 V
Subtopic:  Transformer |
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A thin convex lens of refractive index 1.5 has 20 cm focal length in air. If the lens is completely immersed in a liquid of refractive index 1.6, its focal length will be
 
1.  -160 cm
 
2.  - 100 cm
 
3.  + 10 cm
 
4.  +100 cm
Subtopic:  Lens Makers' Formula |
 56%
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