MCQOPTIONS
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MCQOPTIONS
This section includes 12 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 lens has a power of +3 diopters in air. What will be the power of the lens if it is completely immersed in water? Given, g = ( frac {3}{2} ) and w = ( frac {4}{3} ). |
| A. | 5 D |
| B. | 3 D |
| C. | 1 D |
| D. | ( frac {3}{4} ) D |
| Answer» D. ( frac {3}{4} ) D | |
| 2. |
Find the magnification of the lens if the focal length of the lens is 10 cm and the size of the image is -30 cm. |
| A. | 2 |
| B. | 3 |
| C. | 4 |
| D. | 5 |
| Answer» B. 3 | |
| 3. |
A lens has a focal length of 10 cm. Where the object should be placed if the image is to be 40 cm in the positive direction from the lens? |
| A. | 12 cm |
| B. | 40 cm |
| C. | 13 cm |
| D. | 0.075 |
| Answer» D. 0.075 | |
| 4. |
Calculate the focal length of a biconvex lens if the radii of its surfaces are 50 cm and 20 cm, and index of refraction of the lens glass = 1.2. |
| A. | 0.014 cm |
| B. | 0.715 cm |
| C. | 0.14 cm |
| D. | 71.5 cm |
| Answer» E. | |
| 5. |
The power of a convex lens is negative. |
| A. | True |
| B. | False |
| Answer» C. | |
| 6. |
What is the SI unit of power of a lens? |
| A. | Watts |
| B. | Unit less |
| C. | Diopter |
| D. | Joule |
| Answer» D. Joule | |
| 7. |
According to the thin lens formula, which one of the following is true regarding the focal length of the lens? |
| A. | f is positive for concave lens |
| B. | f is negative for convex lens |
| C. | f is positive for a diverging lens |
| D. | f is negative for concave lens |
| Answer» E. | |
| 8. |
Identify the Lens Maker s Formula. |
| A. | f=( -1) ( ( frac {1}{R_1} frac {1}{R_2} ) ) |
| B. | ( frac {1}{f} )=( -1) ( ( frac {1}{R_1} frac {1}{R_2} ) ) |
| C. | ( frac {1}{f} )=( +1) ( ( frac {1}{R_1} frac {1}{R_2} ) ) |
| D. | ( frac {1}{f} )=( -1) ( ( frac {1}{R_1} + frac {1}{R_2} ) ) |
| Answer» C. ( frac {1}{f} )=( +1) ( ( frac {1}{R_1} frac {1}{R_2} ) ) | |
| 9. |
Sign conventions for spherical refracting surface are the same as those for spherical mirrors. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 10. |
X is thicker in the middle than at the edges, whereas, Y is thicker at the edges than in the middle. Identify X and Y . |
| A. | X = concave lens; Y = convex lens |
| B. | X = convex lens; Y = concave lens |
| C. | X = plane lens; Y = convex lens |
| D. | X = concave lens; Y = plane lens |
| Answer» C. X = plane lens; Y = convex lens | |
| 11. |
Which among the following is a portion of a transparent refracting medium bound by one spherical surface and the other plane surface? |
| A. | Concave mirror |
| B. | Plane mirror |
| C. | Lens |
| D. | Prism |
| Answer» D. Prism | |
| 12. |
How many types of spherical refracting surfaces are there? |
| A. | 2 |
| B. | 3 |
| C. | 4 |
| D. | 5 |
| Answer» B. 3 | |