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
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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 Physics Electrons and Photons Test 1 Online


1. mark reviewWhen 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. mark reviewThe 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. mark reviewNumber of ejected photoelectron increases with increases  ?

Question 3 of 15

4. mark reviewThe energy of a photon of wavelength λ is ?

Question 4 of 15

5. mark reviewGases begin  to conduct electricity at low pressure because ?

Question 5 of 15

6. mark reviewThe 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. mark reviewWhich of the following is true ?

Question 7 of 15

8. mark reviewUltraviolet 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. mark reviewWhich of the following are thermions ?

Question 9 of 15

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

Question 10 of 15

11. mark reviewThe 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. mark reviewThe wavelength associated with an electron, accelerated through a potential difference of100 V, is of the order of ?

Question 12 of 15

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

Question 13 of 15

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

Question 14 of 15

15. mark reviewThe 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


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