The block diagram of a transmitter will have in sequence.(A) Power am…

The correct answer is Option (4) → (C), (B), (A), (E)

In a transmitter the signal moves from the source of the message to the antenna that radiates it, and each block prepares it for the next.

(C) Message signal — comes first, as it is the information to be sent.
(B) Amplitude modulator — next, where the message is impressed on the high-frequency carrier.
(A) Power amplifier — the modulated wave is then raised to the power needed for transmission.
(E) Transmitting antenna — last, it radiates the amplified wave into space.

A square law device (D) is only one way of building the modulator block, not a separate stage in this sequence.

Note: This question is from the pre-rationalised NCERT book (2022-23). The topic was removed from the latest NCERT book (2026-27), and it also appears to be out of the CUET 2026 syllabus.

NCERT (Pre-rationalised edition, 2022-23):
Production of Amplitude Modulated Wave – “… It is to be mentioned that the modulated signal cannot be transmitted as such. The modulator is to be followed by a power amplifier which provides the necessary power and then the modulated signal is fed to an antenna of appropriate size for radiation as shown in Fig. 15.11.”