MCQOPTIONS
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MCQOPTIONS
This section includes 10 Mcqs, each offering curated multiple-choice questions to sharpen your Physics knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
An object is to be seen through a simple microscope of power 10 D. Where should the object be placed to reduce maximum angular magnification? The least distance for distinct vision is 25 cm. |
| A. | + 7.1 cm |
| B. | 7.1 cm |
| C. | + 25 cm |
| D. | 25 cm |
| Answer» C. + 25 cm | |
| 2. |
What focal length should the reading spectacles have for a person for whom the least distance of distinct vision is 50 cm? |
| A. | + 25 cm |
| B. | 25 cm |
| C. | + 50 cm |
| D. | 50 cm |
| Answer» D. 50 cm | |
| 3. |
How does the magnifying power of a telescope change on increasing the diameter of its objective? |
| A. | Independent |
| B. | Doubled |
| C. | Halved |
| D. | Becomes zero |
| Answer» B. Doubled | |
| 4. |
X can see objects in the ultra-violet light while human beings cannot do so. Identify X. |
| A. | Penguin |
| B. | Bees |
| C. | Ant |
| D. | Tiger |
| Answer» C. Ant | |
| 5. |
The upper part of the bi-focal lens is a convex lens while its lower part is a concave lens. |
| A. | True |
| B. | False |
| Answer» C. | |
| 6. |
Which of the following is used to increase the range of a telescope? |
| A. | Increasing the focal length |
| B. | Decreasing the focal length |
| C. | Increasing the diameter of the objective |
| D. | Decreasing the diameter of the objective |
| Answer» D. Decreasing the diameter of the objective | |
| 7. |
Two lenses of focal lengths 5 cm and 50 cm are to be used for making a telescope. Which lens will you use for the objective? |
| A. | Both |
| B. | Neither |
| C. | 5 cm |
| D. | 50 cm |
| Answer» E. | |
| 8. |
A fly is sitting on the objective of a telescope. What will be its effect on the final image of the distant object? |
| A. | Reduces |
| B. | Increases |
| C. | Remains constant |
| D. | Indefinite |
| Answer» B. Increases | |
| 9. |
How much intensity of the image is increased if the diameter of the objective of a telescope is doubled? |
| A. | Two times |
| B. | Four times |
| C. | Eight times |
| D. | Sixteen times |
| Answer» C. Eight times | |
| 10. |
A boy uses spectacles of focal length -50 cm. Name the defect of the vision he is suffering from. |
| A. | Astigmatism |
| B. | Hypermetropia |
| C. | Myopia |
| D. | Presbyopia |
| Answer» D. Presbyopia | |