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. |
If the radius of curvature of each face of the biconcave lens, made of glass of refractive index 1.25 is 50 cm, then what is the focal length of the lens in air? |
| A. | 30 cm |
| B. | -30 cm |
| C. | 5 cm |
| D. | -5 cm |
| Answer» C. 5 cm | |
| 2. |
Calculate its focal length if the radii of curvature of a double convex lens are 10 cm, and 20 cm and its refractive index is 1.75. |
| A. | 50 cm |
| B. | 13 cm |
| C. | 8.9 cm |
| D. | 8 cm |
| Answer» D. 8 cm | |
| 3. |
What happens to the shining of diamond if it is dipped in a transparent oil? |
| A. | Reduces |
| B. | Increases |
| C. | Remains the same |
| D. | Becomes colorless |
| Answer» B. Increases | |
| 4. |
The magnification of X is more than unity. Identify X. |
| A. | Convex mirror |
| B. | Concave mirror |
| C. | Plane mirror |
| D. | Prism |
| Answer» C. Plane mirror | |
| 5. |
Frequency and wavelength change when light passes from a rarer to a denser medium. |
| A. | True |
| B. | False |
| Answer» C. | |
| 6. |
Which of the following causes refraction of light? |
| A. | Change in the density of light from one medium to another |
| B. | Change in viscosity of light from one medium to another |
| C. | Change in the speed of light from one medium to another |
| D. | Change in direction of light from one medium to another |
| Answer» D. Change in direction of light from one medium to another | |
| 7. |
Can the relative refractive index of a medium w.r.t. another medium be less than unity? |
| A. | Insufficient data |
| B. | Indefinite |
| C. | No |
| D. | Yes |
| Answer» E. | |
| 8. |
A man stands in front of a mirror of special shape. He finds that his image has a very small head, a fat body, and legs of normal size. What can we say about the shapes of the three parts of the mirror? |
| A. | Convex, Concave, Plane |
| B. | The plane, Concave, Convex |
| C. | Concave, Convex, Plane |
| D. | Convex, Plane, Concave |
| Answer» B. The plane, Concave, Convex | |
| 9. |
Two concave mirrors have the same focal length but the aperture of one is larger than that of the other. Which mirror forms the sharper image and why? |
| A. | Plane |
| B. | Concave |
| C. | Convex |
| D. | Prism |
| Answer» C. Convex | |
| 10. |
A concave mirror is held in water. What should be the change in the focal length of the mirror? |
| A. | Halved |
| B. | Doubled |
| C. | Remains the same |
| D. | Increases exponentially |
| Answer» D. Increases exponentially | |