Home Physical Optics Test Online Preparation Mcqs Physical Optics Test Online Preparation Mcqs Physical Optics Test Online Preparation Mcqs With Answers Start Below 123456789101112131415Show paginator Hide paginator 7% Question 1 of 15 1. In an interference patternA. Both dark and bright fringes are equal widthB. Central fringes are dimmer than the outer fringesC. Bright fringes are wider than dark fringesD. Dark fringes are wider than bright fringeQuestion 1 of 15 Loading... Question 2 of 15 2. Wavelength of X-rays falling at glancing angle of 30° on a crystal with atomic spacing 2 x 10-10m for the first order diffraction isA. 20x10-10mB. 0.02x10-10mC. 4x10-10mD. 2x10-10mQuestion 2 of 15 Loading... Question 3 of 15 3. When light incident normally on thin film, the path difference depends uponA. All thickness, nature and angle of incidenceB. Nature of the film onlyC. Angle of incidence onlyD. Thickness of the film onlyQuestion 3 of 15 Loading... Question 4 of 15 4. A light ray travelling from denser to rarer medium suffers a phase change ofA. 0°B. 90°C. 45°D. 180°Question 4 of 15 Loading... Question 5 of 15 5. A point source of light placed in a homogenous medium gives rise toA. An elliptical wave frontB. A plane wave frontC. A cylindrical wave frontD. A spherical wave frontQuestion 5 of 15 Loading... Question 6 of 15 6. Which is not optically active substance?A. SugarB. WaterC. Tartaric acidD. Sodium chlorateQuestion 6 of 15 Loading... Question 7 of 15 7. When one mirror of a Michelson Interferometer is moved a distance of 0.5 mm, we observe 2000 fringes. What will be wavelength of light used?A. 5000A°B. 500mC. 2000μmD. 5000nmQuestion 7 of 15 Loading... Question 8 of 15 8. Light on passing through a Polaroid isA. Un-polarizedB. Plane polarizedC. Circularly polarizedD. Elliptically polarizedQuestion 8 of 15 Loading... Question 9 of 15 9. Optically active crystals rotate theA. Vibrating planeB. Diffraction planeC. Polarization planeD. Interference planeQuestion 9 of 15 Loading... Question 10 of 15 10. Signal form the T.V remote control travelsA. With the speed of lightB. With speed of soundC. With the speed of supersonicD. With the speed of ultrasonicQuestion 10 of 15 Loading... Question 11 of 15 11. The locus of all points in a medium having the same phase of vibration is calledA. CrestB. TroughC. Wave frontD. WavelengthQuestion 11 of 15 Loading... Question 12 of 15 12. In double slit experiment, if one of the two slit is covered thenA. No fringes observedB. No interference fringes are observedC. Interference pattern not disturbedD. No diffraction fringes are observedQuestion 12 of 15 Loading... Question 13 of 15 13. In Young’s double slit experiment, the fringe spacing is equal to (d=slit separation and D = distance of screen from slits)A. λD/dB. dλDC. 2λd/DD. λd/DQuestion 13 of 15 Loading... Question 14 of 15 14. A diffraction grating has 500 lines per mm. Its slit spacing or grating element will be equal toA. 500mmB. 2x10-5mmC. 2x10-3mmD. 5x10-3mmQuestion 14 of 15 Loading... Question 15 of 15 15. In doubt slit experiment, we observeA. Diffraction fringes onlyB. Interference fringes onlyC. Polarized fringesD. Both interference and diffraction fringesQuestion 15 of 15 Loading... Loading... Related Study Posts:ASF 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 WiseIB Pakistan NTS Jobs 2024 Online Test Preparation Mcqs