MCQOPTIONS
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MCQOPTIONS
This section includes 15 Mcqs, each offering curated multiple-choice questions to sharpen your UPSEE knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
Which of the following is used in optical fibres? |
| A. | Total internal reflection |
| B. | Scattering |
| C. | Diffraction |
| D. | Refraction |
| Answer» B. Scattering | |
| 2. |
The mirage in desert is caused because: |
| A. | the refractive index of atmosphere does not change with height |
| B. | there is effect of height on refractive index |
| C. | light is reflected by the particles |
| D. | none of the above |
| Answer» C. light is reflected by the particles | |
| 3. |
Image formed by convex mirror is: |
| A. | virtual |
| B. | real |
| C. | enlarged |
| D. | inverted |
| Answer» B. real | |
| 4. |
Select the correct alternative, in case of dispersion without deviation. |
| A. | The emergent rays of all the colours are parallel to the incident ray |
| B. | Only yellow coloured ray is parallel to the incident ray |
| C. | Only red coloured ray is parallel to the incident ray |
| D. | All the rays are parallel, but not parallel to the incident ray |
| Answer» C. Only red coloured ray is parallel to the incident ray | |
| 5. |
If two mirrors are kept at 600 to each other, then the number of images formed by them is: |
| A. | 5 |
| B. | 6 |
| C. | 7 |
| D. | 8 |
| Answer» B. 6 | |
| 6. |
When a ray of light falls on a prism, light gets dispersed because: |
| A. | it is made of glass |
| B. | it is triangular |
| C. | refractive index of the prism material is different for different colours |
| D. | light is of seven colours |
| Answer» D. light is of seven colours | |
| 7. |
The size of the image, if an object of 2.5m height is placed at a distance of 10 cm from a concave mirror is: (Take radius of curvature of concave mirror = 30 cm) |
| A. | 10.5 m |
| B. | 9.2 m |
| C. | 7.5 m |
| D. | 5.6 m |
| Answer» D. 5.6 m | |
| 8. |
When a plane mirror is placed horizontally on level ground at a distance of 60 m from the foot of a tower, the top of the tower and its image in the mirror subtend an angle of 90 degree at the eye. The height of the tower is: |
| A. | 130 m |
| B. | 60 m |
| C. | 90 m |
| D. | 120 m |
| Answer» C. 90 m | |
| 9. |
The number of wavelengths in the visible spectrum is |
| A. | 4000 |
| B. | 6000 |
| C. | 2000 |
| D. | infinite |
| Answer» E. | |
| 10. |
If light travels from one medium to the other of which the refractive index is different, then which of the following will change? |
| A. | Frequency, wavelength and velocity |
| B. | Frequency and wavelength |
| C. | Frequency and velocity |
| D. | Wavelength and velocity |
| Answer» E. | |
| 11. |
Light of different colours propagates through air |
| A. | with velocity of air |
| B. | with different velocities |
| C. | with velocity of sound |
| D. | with equal velocity |
| Answer» E. | |
| 12. |
Mark the correct option of source which is associated with a line emission spectrum. |
| A. | Electric fire |
| B. | Neon street sign |
| C. | Red traffic light |
| D. | Sun |
| Answer» C. Red traffic light | |
| 13. |
Mark the correct option in impure spectrum. |
| A. | Order of colours is reverse |
| B. | Order of colours is irregular |
| C. | Colours are overlapped |
| D. | No colour is present |
| Answer» D. No colour is present | |
| 14. |
A boy of length 10m, to see his own complete image, requires a mirror of length at east equal to |
| A. | 10/4 |
| B. | 10/3 |
| C. | 10/2 |
| D. | 10 |
| Answer» D. 10 | |
| 15. |
Mark the correct option.An object is placed 40 cm away from a concave mirror of focal length 20 cm. The image formed is: |
| A. | real, inverted and same in size |
| B. | real, inverted and smaller |
| C. | virtual, erect and larger |
| D. | virtual erect and smaller |
| Answer» B. real, inverted and smaller | |