CBSE Physics Electrons And Photons Test 1 Online
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# CBSE Physics Electrons and Photons Test 1 Online

 Test Name Electrons and Photons Test Subject CBSE Physics Test Type MCQs Total Question 25 Total Marks 50 Total Time 20 Minutes Test Help For CBSE Physics. CBSE Board Exams. Entrance Exams. Admissions Test. Jobs Test. General Knowledge. All Grades Exams.

Central Board of Secondary Education, CBSE is a Board of Education for public and private schools all India. Physics board exam paper held subject wise as regular basis. Our topics is Electrons and Photons syllabus for preparation. All students get best formed questions answers test take online for get best rank score in examinations.

## CBSE

1. When light of wavelength 300 nm (nanometer) falls on a photoelectric emitter, photoelectrons are liberated. For another emitter, however, light of 600 nm wavelength is sufficient for creating photoemission, what is the ratio of the work functions of the two emitters ?

Question 1 of 15

2. The cathode of a photoelectric cell is changed such that the work function changes from W1 to W2 (W2 > W1). If the current before and after changes are l1 andl2, all other conditions remaining unchanged, then (assuming hv > W2) ?

Question 2 of 15

3. Number of ejected photoelectron increases with increases  ?

Question 3 of 15

4. The energy of a photon of wavelength λ is ?

Question 4 of 15

5. Gases begin  to conduct electricity at low pressure because ?

Question 5 of 15

6. The wavelength of a 1 KeV photon is 1.24 x 10-9m. What is the frequency of 1 MeV photon ?

Question 6 of 15

7. Which of the following is true ?

Question 7 of 15

8. Ultraviolet radiation of 6.2eV falls on an aluminum surface. KE of fastest electron emitted is (work function = 4.2 eV) ?

Question 8 of 15

9. Which of the following are thermions ?

Question 9 of 15

10. If the threshold wavelength for a certain metal is 2000 A°, then the work function of the metal is ?

Question 10 of 15

11. The momentum of a photon of an electromagnetic radiation is 3.3 x 10-29 kg-ms-1. What is the frequency of the associated waves ((h = 6.ò x 10-34 j-s, c = 3 x 108 ms-1) ?

Question 11 of 15

12. The wavelength associated with an electron, accelerated through a potential difference of100 V, is of the order of ?

Question 12 of 15

13. Kinetic energy of an electron which is accelerated in a potential difference of 100 V is ?

Question 13 of 15

14. The threshold frequency for photoelectric effect on sodium corresponds to a wavelength of 5000 A°. Its work function is ?

Question 14 of 15

15. The 21 cm radiowave emitted by hydrogen is interstellar space is due to the interaction called the hyperfine in atomic hydrogen. The energy of the emitted wave is nearly ?

Question 15 of 15

 Test By Subject CBSE Test By Topics Electrons and Photons