Explore topic-wise MCQs in Engineering Physics.

This section includes 9 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 grating has 16000 per inch over a length of 5 inches. What will be the smallest wavelength difference for a light of wavelength 6000 ?

A. 0.01
B. 0.02
C. 0.03
D. 0.04
Answer» D. 0.04
Discussion
2.

What is the minimum number of lines per cm in a 2.5 cm wide grating spectrum which will just resolve two sodium lines (5890 and 5896 ) in the first order spectrum?

A. 98
B. 196
C. 392
D. 694
Answer» D. 694
Discussion
3.

Light is incident normally on a grating of width 5 X 10-3 m with 2500 lines. What is the resolving power of the grating in the second order spectrum?

A. 2500
B. 5000
C. 1250
D. 500
Answer» C. 1250
Discussion
4.

If a light is incident on a grating with 5000 lines/cm, then the angular separation of the two lines (5000 and 5006 ) in first order spectrum is ______

A. 0.01
B. 0.02
C. 0.03
D. 0.04
Answer» C. 0.03
Discussion
5.

The resolving power of a grating is directly proportional to grating constant.

A. True
B. False
Answer» C.
Discussion
6.

Our eyes see two objects as separate, only if the angle subtended by them at the eye is greater than _________

A. 30 seconds
B. 1 minute
C. 2 minute
D. 10 seconds
Answer» C. 2 minute
Discussion
7.

The resolving power of a grating is inversely proportional to the wavelength of the incident light.

A. True
B. False
Answer» B. False
Discussion
8.

What is the SI unit of the Resolving power of a plane transmission grating?

A. m<sup>-1</sup>
B. cm<sup>-1</sup>
C. s<sup>-1</sup>
D. No SI unit
Answer» E.
Discussion
9.

Which of the following is the correct expression for the resolving power of a grating?

A. (nN + 1)/
B. nN/
C. nN/ + 1
D. nN
Answer» E.
Discussion