MCQOPTIONS
Saved Bookmarks
MCQOPTIONS
This section includes 38 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 convex lens of focal length f1 and a concave lens of focal length f2 are placed in contact. The focal length of the combination is |
| A. | F2 + f1 |
| B. | F2 - f1 |
| C. | F1f2/f2+f1 |
| D. | F1f2/f1-f2 |
| Answer» E. | |
| 2. |
A convex lens gives a virtual image only when the objects lies |
| A. | Between principal focus and center of curvature |
| B. | Beyond 2 f |
| C. | At the principal focus |
| D. | Between principal focus and optical center |
| Answer» E. | |
| 3. |
A convex lens acts as a diverging lens if the |
| A. | Object is beyond C |
| B. | If the object is with in C |
| C. | If the object is within f |
| D. | Both (b) and (c) |
| Answer» E. | |
| 4. |
A convex and concave lens of focal length f are in contact the focal length of the combinations will be |
| A. | Zero |
| B. | F / 2 |
| C. | 2f |
| D. | Infinite |
| Answer» E. | |
| 5. |
A lens which converges a beam of parallel rays to a point is called |
| A. | Diverging (or concave) lens |
| B. | Converging (or convex) lens |
| C. | Plano concave lens |
| D. | Plano convex lens |
| Answer» C. Plano concave lens | |
| 6. |
A lens, which is thicker at the center and thinner at the edges is called |
| A. | Concave lens |
| B. | Convex lens |
| C. | Plano convex lens |
| D. | Plano concave lens |
| Answer» C. Plano convex lens | |
| 7. |
A point where the incident parallel rays of light converge or appear to diverge after passing through a lens is called |
| A. | Center of curvature |
| B. | Focus |
| C. | Optical center |
| D. | Aperture |
| Answer» C. Optical center | |
| 8. |
A spectrometer is used to find |
| A. | Wave length of light |
| B. | Refractive index of the prism |
| C. | Wavelength of different colours |
| D. | All of the above |
| Answer» E. | |
| 9. |
The equation ?min = 1.22 ?/D was devised by |
| A. | Newton |
| B. | Einstein |
| C. | Raleigh |
| D. | Planks |
| Answer» D. Planks | |
| 10. |
The function of collimeter in spectrometer is |
| A. | To produce parallel beams of light |
| B. | To filter the light rays |
| C. | To make them |
| D. | No function |
| Answer» B. To filter the light rays | |
| 11. |
The minimum distance between an object and its real image in a convex lens is |
| A. | 2 f |
| B. | 2.5 f |
| C. | 3f |
| D. | 4f |
| Answer» E. | |
| 12. |
The power of a concave lens is |
| A. | Real |
| B. | Virtual |
| C. | Positive |
| D. | Negative |
| Answer» E. | |
| 13. |
The value of critical angle for glass is |
| A. | 42? |
| B. | 47? |
| C. | 52? |
| D. | 50? |
| Answer» B. 47? | |
| 14. |
There is no noticeable boundary between core and cladding |
| A. | Multi mode step index fibre |
| B. | Multi mode graded index fibre |
| C. | Single mode step index fibre |
| D. | All types of fibre |
| Answer» C. Single mode step index fibre | |
| 15. |
Two convex lenses of equal focal length f are placed in contact the resultant focal length of the combination is |
| A. | Zero |
| B. | Focus |
| C. | 2 f |
| D. | F/2 |
| Answer» E. | |
| 16. |
If a convex lens of large aperture fails to converge the light rays incident on it to a single point, it is said to suffer from |
| A. | Chromatic aberration |
| B. | Spherical aberration |
| C. | Both spherical and chromatic |
| D. | Distortion |
| Answer» C. Both spherical and chromatic | |
| 17. |
In optic fiber transmission system __________ are used regenerate the dim light signal. |
| A. | Diodes |
| B. | Repeaters |
| C. | Laser |
| D. | Transformer |
| Answer» C. Laser | |
| 18. |
In multimode step index fibre the refractive index of core and cladding is |
| A. | Same |
| B. | Different |
| C. | Zero |
| D. | Different with refractive index of core higher than cladding |
| Answer» E. | |
| 19. |
In going form a denser to rarer medium a ray of light is |
| A. | Undeviated |
| B. | Bent away form the normal |
| C. | Bent towards the normal |
| D. | Polarized |
| Answer» C. Bent towards the normal | |
| 20. |
If an object is placed away from 2f of a converging lens then the image will be |
| A. | Real and erect |
| B. | Virtual and erect |
| C. | Real and inverted |
| D. | Virtual |
| Answer» D. Virtual | |
| 21. |
Image of an object 5 mm high is only 1 cm high. Magnification produced by lens is |
| A. | 0.5 |
| B. | 0.2 |
| C. | 1 |
| D. | 2 |
| Answer» E. | |
| 22. |
Light signals passes through multimode graded index fibre due to |
| A. | Continuous refraction |
| B. | Total internal reflection |
| C. | Both continuous refraction and total internal reflection |
| D. | Diffraction |
| Answer» B. Total internal reflection | |
| 23. |
In optic fiber transmission the repeater are separated through a distance of ______ km in newer system. |
| A. | 300km |
| B. | 200km |
| C. | 100km |
| D. | 20km |
| Answer» D. 20km | |
| 24. |
Least distance of distinct vision |
| A. | Increases with increase in age |
| B. | Decreases with increase in age |
| C. | Neither increases nor decreases |
| D. | Becomes infinite after 60 years |
| Answer» B. Decreases with increase in age | |
| 25. |
Magnification of the astronomical telescope is |
| A. | Fo+fe |
| B. | Fo/fe |
| C. | Fe/fo |
| D. | (1+fo/fe)L/fo |
| Answer» C. Fe/fo | |
| 26. |
Magnifying power of simple microscope |
| A. | Increase with increase in focal length |
| B. | Increase with decrease in focal length |
| C. | No effect with decrease or increase with focal length |
| D. | List distance of distinct vision |
| Answer» C. No effect with decrease or increase with focal length | |
| 27. |
Michelson devised the formula to calculate the speed of light |
| A. | C = 4fd |
| B. | C = 8fd |
| C. | C = 16fd |
| D. | C = 5/2fd |
| Answer» D. C = 5/2fd | |
| 28. |
Michelson calculated the speed of light using the instruments |
| A. | Spectrometer |
| B. | Galvanometer |
| C. | Interferometer |
| D. | None of these |
| Answer» B. Galvanometer | |
| 29. |
The diameter of a lens is called |
| A. | Focal length |
| B. | Principal axis |
| C. | Aperture |
| D. | Radius of curvature |
| Answer» D. Radius of curvature | |
| 30. |
The electrical signals change into light signals for transmission through optical fibre. A light pulse represent |
| A. | Zero (0) |
| B. | One (1) |
| C. | Both zero (0) and one (1) |
| D. | Neither zero (0) nor one (1) |
| Answer» C. Both zero (0) and one (1) | |
| 31. |
Which one type of fibre is more suitable for transmission of signals in which white light is used ? |
| A. | Mono mode step index fibre |
| B. | Multi mode step index fibre |
| C. | Multi mode graded index fibre |
| D. | Single mode step index fibre |
| Answer» D. Single mode step index fibre | |
| 32. |
Critical angle is that incident angle in denser medium for which angle of refraction is |
| A. | 0? |
| B. | 45? |
| C. | 90? |
| D. | 180? |
| Answer» D. 180? | |
| 33. |
Dioptre power of an concave lens of 10 cm focal length is |
| A. | 10 dioptre |
| B. | 10 dioptre |
| C. | 1 / 10 dioptre |
| D. | 1 / 10 dioptre |
| Answer» C. 1 / 10 dioptre | |
| 34. |
Dispersional effect may produce error in light signals. This type of error |
| A. | Single mode step index fibre |
| B. | Multimode step index fibre |
| C. | Multimode graded index fibre |
| D. | Monomode step index fiber |
| Answer» D. Monomode step index fiber | |
| 35. |
Errors in the transmission of power through optic fiber can be minimized by using a |
| A. | Multimode index fiber |
| B. | Graded index fiber |
| C. | Single mode step index fiber |
| D. | Copper wire |
| Answer» C. Single mode step index fiber | |
| 36. |
Final image produced by a compound microscope is |
| A. | Real and inverted |
| B. | Real and erect |
| C. | Virtual and erect |
| D. | Virtual and inverted |
| Answer» E. | |
| 37. |
For normal adjustment, length of astronomical telescope is |
| A. | Fo + fe |
| B. | Fo - fe |
| C. | Fo / fe |
| D. | Fe / fo |
| Answer» B. Fo - fe | |
| 38. |
If a convex lens of focal length f is cut into two identical halves along the lens diameter the focal length of each half is |
| A. | F |
| B. | F/2 |
| C. | 2f |
| D. | 3f/2 |
| Answer» D. 3f/2 | |