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Correct match of column… (Class 12 Physics SQP 2024-25, Q7)

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PhysicsCBSE Class 12 · Sample paper, session 2024-25 · 1 mark · MCQ

CBSE Class 12 Physics sample paper 2024-25: question 7

From the official CBSE sample question paper for 2024-25, section A, question 7, for 1 mark. Try it first; the hints and our step-by-step solution are below.

Q7 · 1 mark · MCQElectromagnetic Waves

Correct match of column I with column II is

C-I (waves)C-II (Production)
(1) Infra-redP. Rapid vibration of electrons in aerials
(2) RadioQ. Electrons in atoms emit light when they move from higher to lower energy level.
(3) LightR. Klystron valve
(4) MicrowaveS. Vibration of atoms and molecules
  1. (A)1-P, 2-R, 3-S, 4-Q
  2. (B)1-S, 2-P, 3-O, 4-R
  3. (C)1-Q, 2-P, 3-S, 4-R
  4. (D)1-S, 2-R, 3-P, 4-Q

Source: official sample paper from cbseacademic.nic.in (PDF). See it in the full Sample paper 2024-25.

Hints

Open one hint at a time and try again before the next.

Hint 1

Recall the source of each part of the EM spectrum.

Hint 2

Microwaves are produced by klystrons and magnetrons.

Step-by-step solution

Each step shows the marks it earns, as an examiner would award them. Checked by an independent re-solve from the question paper.

  1. Infrared comes from vibrations of atoms and molecules (S). Radio waves come from rapid vibration of electrons in aerials (P).

    ½ mark

  2. Light comes from electronic transitions in atoms (Q). Microwaves come from a klystron valve (R). The match 1-S, 2-P, 3-Q, 4-R is option (B); its 'O' is a misprint for Q.

    ½ mark

Answer: Option (B)

Where the marks are

  • Correct matching 1-S, 2-P, 3-Q, 4-R (1 mark)

Revise the chapter

Practise this chapterBoard-style questions from Electromagnetic Waves, one at a time, marked against the answer key and marking points.Back to the full paperSample paper 2024-25: every question, by section.

The question is transcribed from the official paper; figures are described in words. The solution, hints and chapter tag are ours. Spotted an error? Write tosupport@questionbuddy.in.