Dual Nature of Radiation and Matter MCQ Questions Class 12 Physics Chapter 11

Dual Nature of Radiation and Matter MCQ Questions Class 12 Physics Chapter 11

NCERT MCQ Questions for Class 12 Physics Chapter 11 Dual Nature of Radiation and Matter. Dual Nature of Radiation and Matter MCQ Questions with Answers from Class 12 Physics.

Dual Nature of Radiation and Matter MCQ Questions Class 12 Physics Chapter 11

Dual Nature of Radiation and Matter Multiple Choice Questions with Answers Class 12 Physics Chapter 11 PDF is available.

1) Millikan’s experiment established that

a) Electric charge is neutral

b) Electric charge is quantised

c) Electric charge is not quantised

d) None

Ans: b) electric charge is quantised

2) The minimum energy given to an electron to pull it out from the surface of the metal is called as

a) Threshold frequency

b) Threshold wavelength

c) Work function of the metal

d) None

Ans: c) work function of the metal

3) 1eV =

a) 1.602*1019J

b) 1.602*10-19 J

c) 1.602*10-19 KJ

d) 1.602*10-18 J

Ans: b) 1.602*10-19 J

4) The work function is highest for

a) Platinum

b) Caesium

c) Molybdenum

d) Calcium

Ans: a) platinum

5) The work function is lowest for

a) Platinum

b) Caesium

c) Molybdenum

d) Calcium

Ans: b) caesium

6) The process of emission of free electrons from the metal when sufficient energy is given to it by heating is called as

a) Photonic emission

b) Nuclear emission

c) Thermionic emission

d) Both a and c

Ans: c) thermionic emission

7) When very strong electric field is applied to a metal electrons can be pulled out of the metal as in a spark plug, this process is called as

a) Thermionic emission

b) Electric emission

c) Field emission

d) Photonic emission

Ans: c) field emission

8) When a light of suitable frequency illuminates a metal surface, electrons are emitted from the metal surface, this process is called as

a) Thermionic emission

b) Field emission

c) Photoelectric emission

d) Nucleonic emission

Ans: c) photoelectric emission

9) The electrons generated in photoelectric emission are called as

a) Photons

b) Photoelectrons

c) Phonons

d) None

Ans:  b) photoelectrons

10) The phenomenon of photoelectric emission was discovered by

a) Einstein

b) Hertz

c) Maxwell

d) Faraday

Ans: b) Hertz

11) The minimum frequency of radiation for which photoelectric emission takes place is called as

a) Threshold frequency

b) Emission frequency

c) Photoemission frequency

d) None

Ans: a) threshold frequency

12) The threshold frequency depends on the

a) Intensity of the radiation

b) Wavelength of the radiation

c) Nature of the emitter plate

d) None

Ans: c) nature of the emitter plate

13) Which of the following is not the photosensitive substance

a) Zinc

b) Glass

c) Cadmium

d) Magnesium

Ans: b) glass

14) The phenomenon of emission of photoelectrons from the photosensitive substance is called as

a) Photography

b) Radiography

c) Photoelectric effect

d) Photo effect

Ans: c) photoelectric effect

15) Photoelectric current is directly proportional to

a) Frequency of incident radiation

b) Threshold frequency

c) Intensity of incident radiation

d) None

Ans: c) intensity of incident radiation

16) The photocurrent is directly proportional to

a) Threshold frequency

b) Work function

c) Threshold wavelength

d) Number of photo electrons emitted per second

Ans: d) number of photoelectrons emitted per second

17) The number of photoelectrons emitted per second is directly proportional to

a) Work function

b) Photocurrent

c) Intensity of light incident

d) Both b and c

Ans: c) intensity of light incident

18) The maximum value of photoelectric current is called as

a) Photocurrent

b) Saturation current

c) Conventional current

d) None

Ans: b) saturation current

19) The minimum negative potential given to the plate for which the photocurrent stops or becomes zero is called as

a) Cut off potential

b) Stopping potential

c) Both a and b

d) Saturation potential

Ans: c) both a and b

20) For a given frequency of incident radiation, the stopping potential is

a) Depends on intensity

b) Independent on intensity

c) Depends on photocurrent

d) None

Ans: b) independent on intensity

21) The maximum kinetic energy of the photoelectrons depends on the

a) Light source

b) Emitter plate material

c) Both a and b

d) Intensity of light

Ans: c) both a and b

22) The maximum kinetic energy of emitted photoelectrons is

a) Depends on intensity of incident radiation

b) Independent of intensity of incident radiation

c) Independent of emitter plate material

d) Independent of light source

Ans: b) independent of intensity of incident radiation

23) The stopping potential varies linearly with _____ for a given photosensitive material.

a) Frequency of incident radiation

b) Intensity of incident radiation

c) Both a and b

d) None

Ans: a) frequency of incident radiation

24) The certain minimum frequency for which stopping potential is zero is called as

a) Threshold frequency

b) Cut off frequency

c) Saturation frequency

d) Both a and c

Ans: b) cut off frequency

25) The maximum kinetic energy of photoelectrons varies _____ with the frequency of incident radiation but it is independent of ____

a) Inversely, it’s intensity

b) Linearly, it’s intensity

c) Non linearly, it’s intensity

d) None

Ans: b) linearly, it’s intensity

26) For the frequency which is lower than cut off frequency there is

a) Photoelectric emission takes place

b) No photoelectric emission takes place

c) Partial photoelectric emission takes place

d) None

Ans: b) no photoelectric emission takes place

27) The minimum cut off frequency is called as

a) Threshold wavelength

b) Threshold frequency

c) Both a and b

d) None

Ans: b) threshold frequency

28) The photoelectric emission is the

a) Instantaneous process

b) Not instantaneous process

c) Instantaneous process without any apparent time lag

d) Both a and c

Ans: c) instantaneous process without any apparent time lag

29) Radiation energy is built up of discrete units called as

a) Quanta of energy of radiation

b) Photon

c) Both a and b

d) None

Ans: c) both a and b

30) Each quantum of radiant energy has energy

a) h*frequency

b) h*wavelength

c) h/frequency

d) h/wavelength

Ans: a) h*frequency

31) In interaction of radiation with matter, radiation behaves as if it is made up of particles called as

a) Phonons

b) Photons

c) Free electrons

d) Both b and c

Ans: b) photons

32) The energy of each photon is

a) E= h*wavelength

b) E= h*frequency

c) E= h/frequency

d) E= h/wavelength

Ans: b) E= h*frequency

33) The momentum of each photon is given as

a) p= h*frequency*speed of light

b) p= h*frequency/speed of light

c) p= h*speed of light/frequency

d) p= h*frequency

Ans: b) p= h*frequency/speed of light

34) The energy of photon is

a) Depends on intensity of incident radiation

b) Independent on intensity of incident radiation

c) Depends on wavelength

d) None

Ans: b) independent on intensity of incident radiation

35) Photons are

a) Electrically charged

b) Electrically positive

c) Electrically negative

d) Electrically neutral

Ans: d) electrically neutral

36) In photon particle collision, following quantity is conserved.

a) The momentum

b) The energy

c) Both a and b

d) None

Ans: c) both a and b

37) The wave nature of light was shown by

a) Interference

b) Diffraction

c) Polarisation

d) All

Ans: d) all

38) The particle nature of light was shown by

a) Compton shift

b) Photoelectric effect

c) Both a and b

d) Interference

Ans: c) both a and b

39) According to De Broglie the wavelength associated with a particle of momentum p is given as

a) h/p

b) h/mv

c) Both a and b

d) p/h

Ans: c) both a and b

40) Photocell us used to convert light energy into

a) Chemical energy

b) Nuclear energy

c) Electrical energy

d) Both a and c

Ans: c) electrical energy

41) Working of photocell is based on Phenomenon of

a) Interference

b) Diffraction

c) Polarisation

d) Photoelectric effect

Ans: d) photoelectric effect

42) Planck’s constant has unit

a) J

b) Js

c) J/s

d) J/s2

Ans: b) Js

43) Stopping potential has unit

a) V

b) V/m

c) A

d) J

Ans: a) V

44) Work function is measured in

a) J

b) eV

c) Both a and b

d) J/s

Ans’ c) both a and b

45) Threshold frequency is measured in

a) Hz

b) S-1

c) Both a and b

d) None

Ans: c) both a and b

46) The dimensions of stopping potential are

a) [M L2 T-3 A]

b) [M L-2 T3 A-1]

c) [M L2 T-3 A-1]

d) None

Ans: c) [M L2 T-3 A-1]

47) The dimensions of work function are

a) [M L2 T-2]

b) [M L2 T2]

c) [M-2 L-2 T]

d) [M L-2 T-2]

Ans: a) [M L2 T-2]

48) The dimensions of Planck constant are

a) [M L2 T1]

b) [M L2 T-1]

c) [M-1 L2 T-1]

d) [M-2 L-1 T-1]

Ans: b) [M L2 T-1]

49) The dimensions of threshold frequency are

a) [T]

b) [T-1]

c) [L T-1]

d) [L-1 T-1]

Ans: b) [T-1]

50) The dimensions of de Broglie wavelength are

a) [L]

b) [L-1]

c) [M L]

d) [L-2]

Ans: a) [L]

Updated: April 12, 2023 — 10:43 am

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