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NEET & JEE · Physics · Class 12

Dual Nature of Radiation and Matter — NEET Physics MCQs

30 questions written by hand against the NCERT chapter. Every wrong option is explained, not just the right one.

30questions
10/14/6easy / medium / hard
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Sample questions from this chapter

What is the work function of a metal?
  1. The minimum energy needed for an electron to escape its surface ✓
  2. The maximum kinetic energy of every conduction electron
  3. The energy gained by an electron through one volt
  4. The total energy stored in the metal
Answer: A. The work function φ₀ is the least additional energy required to remove an electron from a metal surface.
Why not B: Metal electrons have an energy distribution, and work function is an escape threshold rather than their kinetic maximum.
Why not C: This defines one electron volt, not a surface property.
Why not D: Work function concerns one electron's minimum removal energy, not bulk stored energy.
At fixed above-threshold frequency, incident intensity is doubled. What happens to saturation current and stopping potential?
  1. Both double
  2. Both remain unchanged
  3. Saturation current doubles; stopping potential is unchanged ✓
  4. Saturation current is unchanged; stopping potential doubles
Answer: C. Intensity doubles photon arrival rate and saturation current, while individual photon energy hν and Kmax stay fixed.
Why not A: Maximum electron energy and stopping potential do not depend on photon number.
Why not B: More incident photons emit more electrons and raise saturation current.
Why not D: This swaps the count-dependent and energy-dependent observables.
Caesium has work function 2.14 eV and receives light of frequency 6.00×10¹⁴ Hz. What is Kmax? Use h=4.14×10⁻¹⁵ eV s.
  1. 0.344 eV ✓
  2. 2.48 eV
  3. 4.62 eV
  4. −0.344 eV
Answer: A. Photon energy is hν=2.484 eV, so Kmax=2.484−2.14=0.344 eV.
Why not B: This reports the entire photon energy hν without subtracting the work function.
Why not C: This adds work function to photon energy instead of spending it on escape.
Why not D: This subtracts photon energy from work function in the wrong order.

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Read the chapter first

Every NCERT question in this chapter is solved, free: NCERT solutions — Dual Nature of Radiation and Matter →

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Questions

How many NEET questions are there on Dual Nature of Radiation and Matter?

This chapter test has 30 questions — 10 easy, 14 medium and 6 hard — all written against the NCERT Class 12 chapter.

Is this NEET Physics chapter test free?

Yes. Every chapter test is free with no login, and you get your all-India rank on every one. Nothing on the site is on sale right now.

Do the questions explain the wrong options?

Yes — every distractor carries its own explanation naming the specific misconception that makes a student pick it. That is the part most question banks skip, and it is the part that changes your next attempt.