Match the following terms with their correct descriptions and select the correct answer using the codes given below the lists.

Question

Match the following terms with their correct descriptions and select the correct answer using the codes given below the lists.

List-X

i. Progressive scanning

ii. SSB

iii. UHF

iv. Negative picture pulses

List-Y

1. Transmits only one sideband of the signal

2. Scans each line in sequence

3. Frequency ranges from 300 MHz to 3 GHz

4. Pulses represent darker areas with higher voltage

1. A. i-1, ii-2, iii-3, iv-4
2. B. i-4, ii-1, iii-3, iv-2
3. C. i-2, ii-1, iii-3, iv-4 (Correct answer)
4. D. i-2, ii-4, iii-3, iv-1

Correct Answer

Option C — i-2, ii-1, iii-3, iv-4

Detailed Solution & Explanation

The correct answer is i-2, ii-1, iii-3, iv-4.

Key Points

• Progressive scanning — 2: scans each line in sequence, in one pass.
• SSB — 1: transmits only one sideband of the signal.
• UHF — 3: the Ultra High Frequency band, 300 MHz to 3 GHz.
• Negative picture pulses — 4: in negative modulation, darker areas of the picture correspond to a higher transmitted voltage.
• The mapping is therefore i-2, ii-1, iii-3, iv-4.

Additional Information

• Negative modulation is used in most television systems because noise impulses then appear as dark spots rather than bright flashes, which the eye finds far less objectionable.
• It also allows the sync pulses to sit at the peak power level, making synchronisation more robust in weak-signal conditions.