Question

Before invention of transistor, vacuum tubes were used and these were named according to number of electrodes they have.
Now, match these with number of electrodes

Column I		Column II
A	Pentode	1	2
B	Tetrode	2	3
C	Triode	3	4
D	Diode	4	5

• A. A-(1), B-(2), C-(3), D-(4)
• B. A-(2), B-(3), C-(4), D-(1)
• C. A-(3), B-(4), C-(1), D-(2)
• D. A-(4), B-(3), C-(2), D-(1)

Answer 1

Answer: (D)

Correct answer is (d) A-(4), B-(3), C-(2), D-(1)