For the given transistors— 1. Point contact transistor

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For the given transistors—
1. Point contact transistor
2. Bipolar junction transistor
3. MOS field effect transistor
4. Junction field effect transistor
The correct sequence of these transistors in the increasing order of input impedance is—

1. 1, 2, 4, 3
2. 1, 2, 3, 4
3. 2, 1, 3, 4
4. 2, 1, 4, 3

Correct Option: D

MOS field effect transistor have higher input impedance than any other transistor.
Hence the correct sequence is (D).