CUET · PHYSICS · PYQ PAPER 2023

Which of the following statements are correct for a transistor action ?
(A) The input resistance depends upon the current \( I_e \) in the transistor
(B) Collector currents is equal to the sum of base current and emitter current
(C) The emitter junction is forward biased
(D) The collector junction is reverse biased
(E) Both the emitter junction as well as the collector junction are forward biased
Choose the correct answer from the options given below :

A (A), (B) and (C) only
B (B), (C) and (D) only
C (C), (D) and (E) only
D (A) and (C) only

Verified Solution

Answer & Solution

Correct Answer

(D) (A) and (C) only

Step-by-step Solution

Detailed explanation

(A) is correct. (C) is correct. (D) is correct. (B) is incorrect because \(I_e = I_b + I_c\). (E) is incorrect because for transistor action (active region), the collector junction is reverse biased. Option (A) and (C) only.

Apply the relevant identity from the chapter and substitute the values established in the previous step, keeping the original constraint in view.

Use the simplified expression to isolate the unknown, then plug the result back into the question setup to confirm the working is internally consistent.

Cross-check against a boundary or limiting case. Both the dimensional balance and the qualitative behaviour at the extreme should agree with the candidate answer.

Combine the steps above to identify the correct option. The remaining choices each fail at least one of the consistency, dimensional, or boundary checks.

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