# CBES Board Class 12/CBES Board(Class 12-Physics)MCQ Questions with Answers(Chapter 11 Dual Nature of Radiation and Matter) Sample Test,Sample questions

1.blue light

2.heat rays

3.infrared light

4.red light

## Question: `According to Einstein’s photoelectric equation, the graph of kinetic energy of the photoelectron emitted from the metal versus the frequency of the incident radiation gives a straight line graph, whose slope`

1.depends on the intensity of the incident radi-ation.

2.depends on the nature of the metal and also on the intensity of incident radiation.

3.is same for all metals and independent of the intensity of the incident radiation.

4.depends on the nature of the metal.

## Question: ` In photoelectric effect, the photocurrent`

1.depends both on intensity and frequency of the incident light.

2.does not depend on the frequency of incident light but depends on the intensity of the inci-dent light.

3.decreases with increase in frequency of inci-dent light.

4.increases with increase in frequency of inci-dent light.

## Question: `Cathode rays were discovered by`

1.Maxwell Clerk James

2.Heinrich Hertz

3.William Crookes

4.J.J. Thomson

## Question: `In Geiger-Marsden scattering experiment, the trajectory traced by an a-particle depends on`

1.number of collision

2.number of scattered a-particles

3.impact parameter

4.none of these

## Question: `In photoelectric effect, stopping potential depends on`

1.frequency of incident light

2.nature of the emitter material

3. intensity of incident light

4.both (1) and (2)

## Question: `In photoelectric effect, the photoelectric current is independent of`

1.intensity of incident light

2.potential difference applied between the two electrodes

3.the nature of emitter material

4.frequency of incident light

1.maximum

2.minimum

3.infinite

4.zero

## Question: `﻿Who established that electric charge is quantised?`

1.J.J. Thomson

2.William Crookes

3.R.A. Millikan

4.Wilhelm Rontgen

## Question: `The first model of atom in 1898 was proposed by`

1.Ernst Rutherford

2.Albert Einstein

3. J.J. Thomson

4.Niels Bohr

1.Balmer

2.Lyman

3. Paschen

4.Pfund

## Question: `The maximum value of photoelectric current is called`

1. base current

2. saturation current

3.collector current

4. emitter current

## Question: `The minimum energy required for the electron emission from the metal surface can be supplied to the free electrons by which of the following physical processes?`

1.Thermionic emission

2.Field emission

3.Photoelectric emission

4.All of these

## Question: `The phenomenon of photoelectric emission was discovered in 1887 by`

1.Albert Einstein

2.Heinrich Hertz

3.Wilhelm Hallwachs

4.Philipp Lenard

1.Lyman series

2.Balmer series

3.Paschen seriee

4.Pfund series

## Question: `Which of the following statements is correct regarding the photoelectric experiment?`

1.The photocurrent increases with intensity of light.

2.Stopping potential increases with increase in intensity of incident light.

3. The photocurrent increases with increase in frequency.

4.All of these

## Question: `Which phenomenon best supports the theory that matter has a wave nature?`

1. Electron momentum

2.Electron diffraction

3.Photon momentum

4.Photon diffraction

## More MCQS

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