10 Question MCQ (including Assertion)

Question 1 of 10

CBSE Past Year 2026

While studying photoelectric emission from a given surface, the wavelength of the incident radiation is changed from 600 nm to 400 nm, keeping the intensity of radiation the same. Then :

A cut-off potential will decrease. B cut-off potential will increase. C saturation current will decrease. D saturation current will increase.

Select one option. Answers are shown after the test.

Question 2 of 10

CBSE Past Year 2026

Radiation of wavelength 331 nm irradiates the following metals :

Diagram for question 9

Which of the following statements is correct ?

A Only Na and K show photoelectric emission. B Only Mo will not show photoelectric emission. C All of the given metals show photoelectric emission. D None of them show photoelectric emission.

Select one option. Answers are shown after the test.

Question 3 of 10

CBSE Past Year 2026

A 500 nm photon is incident normally on a perfectly reflecting surface and is reflected. The value of momentum transferred to the surface is :

A 3·87 × \(10^{–43}\) kg m\(s^{–1}\) B 2·5 × \(10^{–30}\) kg m\(s^{–1}\) C 2·65 × \(10^{–27}\) kg m\(s^{–1}\) D 1·33 × \(10^{–27}\) kg m\(s^{–1}\)

Select one option. Answers are shown after the test.

Question 4 of 10

CBSE Past Year 2026

Photons of frequency v are incident on the surfaces of two metals A and B of threshold frequencies \(\frac{v}{2}\) and \(\frac{v}{3}\) . The ratio of maximum kinetic energy of electrons emitted from metal A to that from metal B is :

A \(\frac{1}{3}\) B \(\frac{3}{4}\) C \(\frac{2}{3}\) D \(\frac{3}{2}\)

Select one option. Answers are shown after the test.

Question 5 of 10

CBSE Past Year 2026

The momentum of a photon associated with a microwave of wavelength 4·00 cm is :

A 1·66 × \(10^{–32}\) kg m\(s^{–1}\) B 1·83 × \(10^{–34}\) kg m\(s^{–1}\) C 2·05 × \(10^{–34}\) kg m\(s^{–1}\) D 1·66 × \(10^{–34}\) kg m\(s^{–1}\)

Select one option. Answers are shown after the test.

Question 6 of 10

CBSE Past Year 2026

The kinetic energy of a charged particle is increased to four times of its initial value. The de Broglie wavelength associated with the particle will :

A increase by 100% of its initial value. B increase by 50% of its initial value. C decrease by 25% of its initial value. D decrease by 50% of its initial value.

Select one option. Answers are shown after the test.

Question 7 of 10

CBSE Past Year 2026

Assertion (A) : Photoelectric effect is a spontaneous phenomenon.

Reason (R) : According to the wave picture of radiation, an electron would take hours/days to absorb sufficient energy to overcome the work function and come out from a metal surface.

A Both Assertion and Reason are true, and Reason is the correct explanation of Assertion. B Both Assertion and Reason are true, but Reason is not the correct explanation of Assertion. C Assertion is true, but Reason is false. D Both Assertion and Reason are false.

Select one option. Answers are shown after the test.

Question 8 of 10

CBSE Past Year 2026

Assertion (A) : Photoelectric current depends upon the intensity of the incident radiation.

Reason (R) : Stopping potential is independent of the intensity of the incident radiation.

A Both Assertion and Reason are true, and Reason is the correct explanation of Assertion. B Both Assertion and Reason are true, but Reason is not the correct explanation of Assertion. C Assertion is true, but Reason is false. D Both Assertion and Reason are false.

Select one option. Answers are shown after the test.

Question 9 of 10

CBSE Past Year 2026

Light of which of the following colours will have the maximum energy in a photon associated with it ?

A Red light B Yellow light C Green light D Blue light

Select one option. Answers are shown after the test.

Question 10 of 10

CBSE Past Year 2026

In an experiment on photoelectric emission, the intensity of incident radiation is halved keeping its frequency constant. As a result :

A cut-off potential will increase. B maximum kinetic energy of photoelectrons will remain the same. C photocurrent will increase. D cut-off potential will decrease.

Select one option. Answers are shown after the test.

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10 Question MCQ (including Assertion)