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NEET & JEE · Physics · Class 12

Dual Nature of Radiation and Matter — NEET & JEE 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 →

Other NEET Physics chapters

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Questions

How many NEET and JEE 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 and JEE 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.