Day 130: MHT-CET Physics

1. A.
   $9L$
2. B.
   $6L$
3. C.
   $\dfrac{L}{3}$
4. D.
   $\dfrac{L}{9}$

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1. A.
   LED's have long lifetime if properly manufactured.
2. B.
   Colours produced by LED's do not fade out.
3. C.
   LED's are energy efficient.
4. D.
   Brightness of light emitted by LED cannot be controlled.

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1. A.
   $4l$
2. B.
   $\left(\dfrac{5}{4}\right)l$
3. C.
   $\left(\dfrac{4}{3}\right)l$
4. D.
   $\left(\dfrac{3}{2}\right)l$

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1. A.
   $4$, $16 : 9$
2. B.
   $8$, $16 : 9$
3. C.
   $8$, $49 : 1$
4. D.
   $4$, $49 : 1$

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1. A.
   $5 : 4$
2. B.
   $4 : 3$
3. C.
   $1 : 5$
4. D.
   $7 : 1$

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