Resistance between two points of a circuit when an ideal diode is forward or reverse biased

1. A.
   $\frac{2}{3}$
2. B.
   $\frac{2}{5}$
3. C.
   $\frac{3}{2}$
4. D.
   $\frac{5}{2}$

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1. A.
   2:1
2. B.
   1:1
3. C.
   1:2
4. D.
   1:4

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

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1. A.
   $40\,\Omega$ and $20\,\Omega$
2. B.
   $60\,\Omega$ and $30\,\Omega$
3. C.
   $20\,\Omega$ and $40\,\Omega$
4. D.
   $30\,\Omega$ and $60\,\Omega$

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