MCQOPTIONS
Saved Bookmarks
MCQOPTIONS
This section includes 36 Mcqs, each offering curated multiple-choice questions to sharpen your Physics knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
A light ray traveling form rarer to denser medium suffers a phase change of |
| A. | 60? |
| B. | 90? |
| C. | 180? |
| D. | 45? |
| Answer» D. 45? | |
| 2. |
A diffraction grating has 500 lines per mm. Its slit spacing or grating element will be equal to |
| A. | 500 mm |
| B. | 5 x 10-3 mm |
| C. | 2 x 10-5 mm |
| D. | 2 x 10-3 mm |
| Answer» E. | |
| 3. |
According to Einstein light travels form one place to another in the form of |
| A. | Waves |
| B. | Particles |
| C. | Photons |
| D. | It was not his discovery |
| Answer» D. It was not his discovery | |
| 4. |
A point source of light placed in a homogeneous medium gives rise to |
| A. | A cylindrical wave front |
| B. | An elliptical wave front |
| C. | A spherical wave front |
| D. | A plane wave front |
| Answer» D. A plane wave front | |
| 5. |
A thing that emits its own light is |
| A. | Luminous |
| B. | Non-luminous |
| C. | Incandescent |
| D. | Bright |
| Answer» B. Non-luminous | |
| 6. |
appearance of colour in thin films is due to |
| A. | Diffraction |
| B. | Dispersion |
| C. | Interference |
| D. | Polarization |
| Answer» D. Polarization | |
| 7. |
Central spot of Newtons rings |
| A. | Bright |
| B. | Dark for large wavelength |
| C. | Dark |
| D. | Bright for large wavelength |
| Answer» B. Dark for large wavelength | |
| 8. |
Crystals of a material can behave as |
| A. | Convex lens |
| B. | Interferometer |
| C. | Diffraction grating |
| D. | Concave |
| Answer» D. Concave | |
| 9. |
Diffarction fringes are |
| A. | Equally spaced |
| B. | Distance between them increases |
| C. | Distance between then decreases |
| D. | They are adjacent with no space in between |
| Answer» D. They are adjacent with no space in between | |
| 10. |
gives the definition of metre in terms of wavelength of red cadmium light |
| A. | Newton |
| B. | Einstein |
| C. | Michelson |
| D. | Galileo |
| Answer» D. Galileo | |
| 11. |
Diffraction effect is |
| A. | More for a round edge |
| B. | Less for a round edge |
| C. | More for a sharp edge |
| D. | Less for a sharp edge. |
| Answer» D. Less for a sharp edge. | |
| 12. |
In a plane polarized light |
| A. | Vibration in all direction |
| B. | Vibration in two mutually perpendicular directions |
| C. | Vibration take place in a direction perpendicular to the direction of propagation of light |
| D. | No vibration at all |
| Answer» D. No vibration at all | |
| 13. |
In an interference pattern |
| A. | Bright fringes are wider than dark fringes |
| B. | Dark fringes are wider than bright fringe |
| C. | Both dark and bright fringes are of equal width |
| D. | Central fringes are brighter than the outer fringes |
| Answer» D. Central fringes are brighter than the outer fringes | |
| 14. |
In double slit experiment we observe |
| A. | Interference fringes only |
| B. | Diffraction fringes only |
| C. | Both interference and diffraction fringes |
| D. | Polirized frringes |
| Answer» D. Polirized frringes | |
| 15. |
In double slit experiment if one of the two slit is covered then |
| A. | No interference fringes are observed |
| B. | No diffraction fringes are observed |
| C. | No fringes observed |
| D. | Interference pattern not disturbed |
| Answer» B. No diffraction fringes are observed | |
| 16. |
Two sources of light are coherent if they emit rays of |
| A. | Same wavelength |
| B. | Same amplitude of vibration |
| C. | Same wave length with constant phase difference |
| D. | Same amplitude and wavelength |
| Answer» D. Same amplitude and wavelength | |
| 17. |
Wavelength of X-rays falling at glancing angle of 30? on a crystal with atmic spacing 2 x 10-10 for the fist order diffraction is |
| A. | 4 x 10-10 m |
| B. | 2 x 10-10 m |
| C. | 0.02x10-10m |
| D. | 20x10-10m |
| Answer» C. 0.02x10-10m | |
| 18. |
When crest of one wave falls over the trough of the other wave this phenomenon is known as |
| A. | Polarization |
| B. | Constructive interference |
| C. | Destructive interference |
| D. | Diffraction |
| Answer» D. Diffraction | |
| 19. |
When light incident normally on thin film the path difference depends upon |
| A. | Thickness of the film only |
| B. | Nature of the film only |
| C. | Angle of indidence only |
| D. | All thickness nature and angle of incidence |
| Answer» E. | |
| 20. |
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. | 5000 nm |
| B. | 5000A? |
| C. | 500m |
| D. | 2000um |
| Answer» C. 500m | |
| 21. |
Which one of the following properties of light does not change with the nature of the medium? |
| A. | Velocity |
| B. | Wavelength |
| C. | Amplitude |
| D. | Frequency |
| Answer» E. | |
| 22. |
Which experiment shows that wavelength of light is smaller than that of sound |
| A. | Diffraction |
| B. | Polarization |
| C. | Interference |
| D. | Reflection |
| Answer» B. Polarization | |
| 23. |
In Michelson interferometer to switch the fringe from bright to dark the mirror should be displaced through |
| A. | ? / 2 |
| B. | ?/3 |
| C. | ?/6 |
| D. | ?/4 |
| Answer» E. | |
| 24. |
In monochromatic red light a blue book will probably appear to be |
| A. | Black |
| B. | Purple |
| C. | Green |
| D. | No scientific reasoning available |
| Answer» B. Purple | |
| 25. |
In Young double slit experiment, if white light is used |
| A. | Alternate dark and bright fringes will be seen |
| B. | Coloured fringes will be seen |
| C. | No interference fringes will be seen |
| D. | Impossible to predict |
| Answer» C. No interference fringes will be seen | |
| 26. |
Light reaches the earth form sun in nearly |
| A. | 15 minutes |
| B. | 10 minutes |
| C. | 8 minutes |
| D. | 8 minutes 30 seconds |
| Answer» E. | |
| 27. |
In the shadow of a ball the central portion appears bright that happens due to |
| A. | Interference |
| B. | Diffraction |
| C. | Polarization |
| D. | Refraction |
| Answer» C. Polarization | |
| 28. |
Light on passing through a Polaroid is |
| A. | Plane polarized |
| B. | Un-polarized |
| C. | Circularly polarized |
| D. | Elliptically polarized |
| Answer» B. Un-polarized | |
| 29. |
In Youngs double slit experiment the fringe spacing is equal to |
| A. | D?D |
| B. | 2?d/D |
| C. | ?D/d |
| D. | ?d/D |
| Answer» D. ?d/D | |
| 30. |
Photoelectric effect was given by |
| A. | Hertz |
| B. | Fresnel |
| C. | Einstein |
| D. | Plank |
| Answer» D. Plank | |
| 31. |
Optical active crystals rotates the |
| A. | Vibrating plane |
| B. | Polarization plane |
| C. | Diffraction plane |
| D. | Interference plane |
| Answer» C. Diffraction plane | |
| 32. |
The blue colour of the sky is due to |
| A. | Diffraction |
| B. | Reflection |
| C. | Polarization |
| D. | Scattering |
| Answer» E. | |
| 33. |
The condition for constructive interference of two coherent beams is that the path difference should be |
| A. | Integral multiple of ?/2 |
| B. | Integral multiple of ? |
| C. | Odd integral multiple of ?/2 |
| D. | Even integral multiple of ? |
| Answer» C. Odd integral multiple of ?/2 | |
| 34. |
The locus of all points in a medium having the same phase of vibration is called |
| A. | Crest |
| B. | Trough |
| C. | Wavelength |
| D. | Wave front |
| Answer» E. | |
| 35. |
The wavelengthe of X-rays is of the order of |
| A. | 10A? |
| B. | 1000 A? |
| C. | 1A? |
| D. | 100 A? |
| Answer» D. 100 A? | |
| 36. |
The velocity of light was determined accurately by |
| A. | Newton |
| B. | Michelson |
| C. | Huygen |
| D. | Young |
| Answer» C. Huygen | |