Dual Nature of Radiation and Matter Additional Practice Test

12th Standard Physics — Dual Nature of Radiation and Matter: Additional Online Practice Test

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Which method of electron emission involves the application of a strong external electric field to pull electrons from a metal surface?

A.Thermionic emission B.Field emission C.Photoelectric emission D.Secondary emission

In the observations of Hallwachs, what happened to a negatively charged zinc plate when it was irradiated with ultraviolet light?

A.It became more negative B.It lost its negative charge C.It remained unchanged D.It released positive ions

The minimum frequency of incident radiation required to trigger photoelectric emission for a specific metallic surface is known as the:

A.Stopping frequency B.Cut-off wavelength C.Threshold frequency D.Quantized frequency

How does the stopping potential change if the intensity of incident light is doubled while keeping the frequency constant?

A.It is doubled B.It is quadrupled C.It is halved D.It remains the same

According to Einstein's quantum explanation, the energy of a single photon of frequency \(\nu\) is given by:

A.\(E = \frac{1}{2} h \nu\) B.\(E = h \nu\) C.\(E = h \lambda\) D.\(E = \frac{h}{\nu}\)

According to de Broglie's hypothesis, if a particle's momentum increases, its associated matter wavelength will:

A.Increase B.Decrease C.Remain constant D.Become zero

The de Broglie wavelength of an electron accelerated through a potential difference of \(V\) volts is approximately given by which expression?

A.\(\lambda = \frac{12.27}{\sqrt{V}}\) \AA B.\(\lambda = \frac{1.227}{\sqrt{V}}\) \AA C.\(\lambda = 12.27 \sqrt{V}\) \AA D.\(\lambda = \frac{\sqrt{V}}{12.27}\) \AA

The Davisson-Germer experiment was historically significant because it experimentally verified:

A.The particle nature of light B.The wave nature of material particles C.The existence of X-rays D.The quantization of electric charge

In an electron microscope, the components used to focus the electron beam are known as:

A.Optical glass lenses B.Polished silver mirrors C.Electric or magnetic fields D.Diffraction gratings

Q10

Which of the following occurs during the production of X-rays in a Coolidge tube?

A.Slow electrons collide with gas molecules B.Fast electrons are suddenly decelerated by a target C.Protons are emitted from a hot filament D.Light is converted into high-energy electrons

Q11

In a continuous X-ray spectrum, the minimum wavelength (cut-off wavelength \(\lambda_0\)) is determined solely by the:

A.Atomic number of the target B.Intensity of the electron beam C.Accelerating potential difference D.Temperature of the target

Q12

The sharp peaks observed in characteristic X-ray spectra are produced by:

A.The thermal heating of the anode B.Electronic transitions between inner atomic shells C.Scattering of electrons by air molecules D.Reflection of electrons from the glass tube

Q13

A device that converts incident light energy into electrical energy using the principle of the photoelectric effect is a:

A.Thermocouple B.Photoelectric cell C.Galvanometer D.Transformer

Q14

The work function of a metal surface is most commonly measured in which of the following units?

A.Watt B.Tesla C.Electron volt (eV) D.Ohm

Q15

The conclusion that light propagates as a wave but interacts with matter as a stream of particles is described as:

A.Wave-particle duality B.Electromagnetic induction C.The uncertainty principle D.Wavefront division

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About this Dual Nature of Radiation and Matter test

This free online practice test covers Dual Nature of Radiation and Matter from the 12th Standard Physics (Samacheer Kalvi) syllabus. Choose the number of questions and an optional time limit, then answer and submit — everything is checked in your browser, with the correct answers and a worked explanation shown at the end. For the full solutions to every question in this set, see the solved MCQs page.

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