Which of the following is a biodegradable polymer?

The output characteristics of an $n-p-n$ transistor represent,($I_C=$ collector current,$V_{C E}=$ potential difference between collector and emitter,$I_B=$ base current,$V_{B B}=$ voltage given to base,$V_{B E}=$ the potential difference between base and emitter)

Which of the following pairs contains structurally similar substances?

Which of the following is a biodegradable polymer?

The magnifying power of a simple microscope is (when the final image is formed at $D = 25 \ cm$ from the eye):

Which one of the following statements is correct?