Home Dawn of Modern Physics Test Online Preparation Mcqs Dawn of Modern Physics Test Online Preparation Mcqs Dawn of Modern Physics Test Online Preparation Mcqs With Answers Start Below 123456789101112131415Show paginator Hide paginator 7% Question 1 of 15 1. U.V radiations of 6.2eV falls on an aluminium surface, K.E of fastest electron emitted is (work function = 4.2eV)A. 9x10-32JB. 7x10-25JC. 3.2x10-21JD. 3.2x10-19JQuestion 1 of 15 Loading... Question 2 of 15 2. For confinement of electron in a box of radius 10-14m, the electron speed should be ______.A. 107m/secB. Should be greater than speed of lightC. Not be wavelikeD. Be zeroQuestion 2 of 15 Loading... Question 3 of 15 3. A photon of wavelength 900nm behaves like a particle of mass _______.A. 1.84x10-44kgB. 2.46x10-36kgC. 5.53x10-36kgD. 0 kgQuestion 3 of 15 Loading... Question 4 of 15 4. According to special theory of relativity, time is not absolute quantity. This result applies to _______ timing processes.A. ChemicalB. PhysicalC. BiologicalD. AllQuestion 4 of 15 Loading... Question 5 of 15 5. A device based on photoelectric effect is called ________.A. PhotosynthesisB. Photo sensitive detectionC. Photo cellD. Photo diodeQuestion 5 of 15 Loading... Question 6 of 15 6. If n number of photon are striking on a metal surface, then total momentum exerted is _____.A. nFtB. ZeroC. nhλD. 2nhλQuestion 6 of 15 Loading... Question 7 of 15 7. Stopping potential for a metal surface in case of photoelectric emission depends on __________.A. All of the aboveB. The threshold frequency for the metal surfaceC. The intensity of incident lightD. The frequency of incident light and work function of the metal surfaceQuestion 7 of 15 Loading... Question 8 of 15 8. The ratio of e/m of a proton to that of an alpha particle isA. 1:2B. 1:1/4C. 1:4D. 1:1Question 8 of 15 Loading... Question 9 of 15 9. If a material object moves with speed of light, its mass becomes ______A. ZeroB. InfiniteC. Double of its rest massD. Equal to its rest massQuestion 9 of 15 Loading... Question 10 of 15 10. In electron microscope, we use energetic particles because of _______.A. Penetrating power is highB. Wavelength is very shortC. Kinetic energy is largeD. All the above reasonsQuestion 10 of 15 Loading... Question 11 of 15 11. An observer shoots parallel to a meter stick at very high (relativistic) speed and finds that the legth of meter stick is ________.A. One meterB. Less than one meterC. Greater than one meterD. A foolish questionQuestion 11 of 15 Loading... Question 12 of 15 12. Linear momentum of a photon is ________A. ZeroB. hf/c2C. c2/hfD. hf/cQuestion 12 of 15 Loading... Question 13 of 15 13. If a diffraction grating is placed in the path of a light beam, it reveals ________.A. Particle propertyB. Wave propertyC. Energy particleD. Electromagnetic wave propertyQuestion 13 of 15 Loading... Question 14 of 15 14. The resolution of 50 KV electron microscope is:A. 0.5 to 1 nmB. 0.5 to 1 μ mC. 0.2 nmD. 0.2 to 0.5 μ mQuestion 14 of 15 Loading... Question 15 of 15 15. In Compton scattering, the change in wave length is max. if _______.A. Angle of scattering is 180°B. Angle of scattering is 60°C. Angle of scattering is zeroD. Angle of scattering is 90°Question 15 of 15 Loading... Loading... Related Study Posts:MDCAT Test Physics Test Online PreparationASF Written Test Preparation Online McqsOnline ECAT Test Preparation McqsFPSC SST Test Preparation Mcqs OnlinePPSC Lecturer Test Preparation Online McqsLecturer Test KPPSC Preparation Mcqs OnlineTESCO Jobs Online NTS Test Preparation McqsFIA ASI Sub Inspectors Job 2024 OTS Test Preparation…SPSC SST Test Preparation Mcqs Online with SyllabusFPSC Test Preparation Mcqs Online Subject Wise