NEET (UG)

Practice Test 1 — Dual Nature of Radiation & Matter

12 questions • 18 minutes • auto-graded with full solutions

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Section A — MCQ (Single Correct)

Question 1

The maximum kinetic energy of photoelectrons depends on the:

Solution: $K_{max}$ depends on frequency only.

Question 2

The number of photoelectrons emitted per second is proportional to the:

Solution: Number (current) is proportional to intensity.

Question 3

Einstein's photoelectric equation is:

Solution: $K_{max} = h\nu - \phi$.

Question 4

The energy of a photon is:

Solution: $E = h\nu$.

Question 5

The work function equals:

Solution: $\phi = h\nu_0$.

Question 6

The de Broglie wavelength of a particle is:

Solution: $\lambda = h/p$.

Question 7

The wave nature of electrons was confirmed by:

Solution: Davisson–Germer demonstrated electron diffraction.

Question 8

The momentum of a photon of wavelength $\lambda$ is:

Solution: $p = h/\lambda$.

Section B — Assertion & Reason

Question 9

A: Increasing the intensity of incident light does not increase the maximum kinetic energy of photoelectrons.
R: The maximum kinetic energy depends only on the frequency of the incident light.

Solution: Since $K_{max} = h\nu - \phi$ depends on frequency, intensity does not change it — R explains A.

Question 10

A: Heavy, fast-moving objects do not show observable wave behaviour.
R: Their de Broglie wavelength is extremely small because of their large momentum.

Solution: Large momentum gives a tiny $\lambda = h/p$, too small to detect — R explains A.

Question 11

A: A photon is deflected when it passes through an electric field.
R: A photon carries energy and momentum.

Solution: A photon is neutral and is not deflected by fields, so A is false; it does carry energy and momentum, so R is true.

Question 12

A: Light exhibits both wave and particle nature.
R: Interference shows its wave nature while the photoelectric effect shows its particle nature.

Solution: The two phenomena demonstrate the two natures, supporting duality — R explains A.