MCQOPTIONS
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MCQOPTIONS
This section includes 11 Mcqs, each offering curated multiple-choice questions to sharpen your Engineering Physics knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
A diffraction grating has 4000 lines/cm. The dispersive power of the grating in the third order spectrum in the wavelength region of 5000 is _____________ |
| A. | 5000 |
| B. | 10000 |
| C. | 15000 |
| D. | 20000 |
| Answer» D. 20000 | |
| 2. |
For a plane transmission grating with 5000 lines/cm what are the the absent order spectra if the width of the opacity is twice that of the frequency? |
| A. | 1<sup>st</sup>, 3<sup>rd</sup>, 5<sup>th</sup>, |
| B. | 2<sup>nd</sup>, 4<sup>th</sup>, 6<sup>th</sup>, |
| C. | 3<sup>rd</sup>, 6<sup>th</sup>, 9<sup>th</sup>, |
| D. | 4<sup>th</sup>, 8<sup>th</sup>, 12<sup>th</sup>, |
| Answer» D. 4<sup>th</sup>, 8<sup>th</sup>, 12<sup>th</sup>, | |
| 3. |
What is the highest order spectrum which may be seen with a monochromatic light of wavelength 5000 by means of a diffraction grating with 5000 lines/cm? |
| A. | 1 |
| B. | 2 |
| C. | 3 |
| D. | 4 |
| Answer» E. | |
| 4. |
A beam of monochromatic light is incident on a plane transmission grating having 5000 lines/cm and the second order spectral line is found to be diffracted at 30 . The wavelength of the light is _______ |
| A. | 4000 |
| B. | 5000 |
| C. | 6000 |
| D. | 7000 |
| Answer» C. 6000 | |
| 5. |
What is the relation between the dispersive power, D, of a grating and the order, n, of a spectrum? |
| A. | D n |
| B. | D N<sup>2</sup> |
| C. | D 1/n |
| D. | D 1/N<sup>2</sup> |
| Answer» B. D N<sup>2</sup> | |
| 6. |
The expression for the maximum number of orders in a grating spectrum is given by ____________ |
| A. | / (a + b) |
| B. | a/ |
| C. | b/ |
| D. | (a + b)/ |
| Answer» E. | |
| 7. |
If (a + b) < n , then nth order spectrum will be absent. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 8. |
If there are N number of slits in a grating spectra, then there will be how many secondary maximas? |
| A. | N |
| B. | N 1 |
| C. | N 2 |
| D. | 2N |
| Answer» D. 2N | |
| 9. |
Which of the following is the correct expression for the ratio of the intensity of principal maxima to the intensity of secondary maxima? |
| A. | 1 + (N<sup>2</sup>-1) sin<sup>2</sup> |
| B. | 1/1 + (N<sup>2</sup>-1) sin<sup>2</sup> |
| C. | (N<sup>2</sup>-1) sin<sup>2</sup> |
| D. | 1/(N<sup>2</sup>-1) sin<sup>2</sup> |
| Answer» B. 1/1 + (N<sup>2</sup>-1) sin<sup>2</sup> | |
| 10. |
The CDs available in the market act as ____________ |
| A. | Diffraction grating |
| B. | Reflection grating |
| C. | Transmission grating |
| D. | Do not act as a grating |
| Answer» C. Transmission grating | |
| 11. |
If a is the width of the slits and b the distance between the slits, then a + b is called as _________ |
| A. | Opacities |
| B. | Transparency |
| C. | Grating Constant |
| D. | Grating value |
| Answer» D. Grating value | |