Bihar Board - Class 12 Physics - Chapter 11: Dual Nature of Radiation and Matter Multiple Choice Questions (MCQs)
For Class 12 Bihar Board, the chapter Dual Nature of Radiation and Matter in Physics explains the wave-particle duality of light and matter, covering key concepts like the photoelectric effect and de Broglie's hypothesis. You can also find the multiple-choice questions that help in mastering these topics and preparing effectively for exams on Vidyakul.
Multiple Choice Question
1. Millikan’s experiment established that
(A) Electric charge is neutral
(B) Electric charge is quantised
(C) Electric charge is not quantised
(D) None
Answer: (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
Answer: (C) work function of the metal
3. 1eV =
(A) 1.6021019J
(B) 1.60210-19J
(C) 1.6021018 KJ
(D) 1.60210-18 J
Answer: (B) 1.60210-19 J
4. The work function is highest for
(A) Platinum
(B) Caesium
(C) Molybdenum
(D) Calcium
Answer: (A) platinum
5. The work function is lowest for
(A) Platinum
(B) Caesium
(C) Molybdenum
(D) Calcium
Answer: (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)
Answer: (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
Answer: (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
Answer: (C) photoelectric emission
9. The electrons generated in photoelectric emission are called as
(A) Photons
(B) Photoelectrons
(C) Phonons
(D) None
Answer: (B) photoelectrons
10. The phenomenon of photoelectric emission was discovered by
(A) Einstein
(B) Hertz
(C) Maxwell
(D) Faraday
Answer: (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
Answer: (A) threshold frequency
12. What is the threshold frequency condition?
(A) Intensity
(B) Wavelength
(C) metal
(D) None
Answer: (C) metal
13. Which of the following metals respond only to UV light to cause electron emission from its surface ?
(A) Zinc
(B) Glass
(C) Cadmium
(D) Magnesium
Answer: (A) Zinc
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