ECAT Pre General Science Chapter 9 online mcq test with answers for Physics chapter 9 (Physical Optics)

ECAT Pre General Science Physics Chapter 9 Physical Optics Online Test

Sr. #	Questions	Answers Choice
1	Certain light of wavelength 600 nm is used to view an object under the microscope. If the aperture of its objective is 1.22 cm, then the limiting angle of resolution will be:	6 x 10<sup>-5</sup>rad 7 x 10<sup>-5</sup>rad 8 x 10<sup>-5</sup>rad None of these
2	In the formula R = N x m for diffraction grating, N denotes:	No. of lines/cm No. of lines/meter Total number of lines None of above
3	A grating with high resolving power can distinguish _______ difference in wavelengths :	Larger Zero None of these Smaller
4	A grating with high resolving power can distinguish _______ difference in wavelengths :	Smaller Larger Zero None of these
5	Resolving power in mth order diffraction for grating is given by:	R = m/N R = N x m None of these R = N/m
6	Resolving power in mth order diffraction for grating is given by:	R = N/m R = m/N None of these R = N x m
7	To see the minor details of the object by microscope, it should have:	High magnifying power High resolving power Am objective of larger focal length None of these
8	The focal length of convex lens having magnifying power of 5.55 is:	5.5 cm 5 cm 4.5 cm 6 cm
9	The image of an object 5 mm length is only 1 cm high. The magnification produced by lens is:	1 0.2 2 0.1
10	A magnifier gives an image which is:	Virtual, inverted Real, erect Virtual, erect Real, inverted
11	The magnifier forms a virtual image of the object at:	None of these Both A and B are correct Much farther than the least distance Least distance of distinct vision
12	The magnifier forms a virtual image of the object at:	None of these Least distance of distinct vision Much farther than the least distance Both A and B are correct
13	The size of the image is maximum when its distance from the magnifying glass is:	0.10 m 0.15 m 0.20 m 0.25 m
14	The ratio of the size of the image to that of object is called:	Focal length Aperture Linear magnification Principal axis
15	If the object is placed at 12 cm distance from a convex lens of focal length 6 cm, then we get an image of ____ as that of object:	Double the size Same size Half the size None of these

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