Physics ECAT Pre Engineering MCQ's Test For Full Book With Answers

Physics ECAT Pre Engineering MCQ's Test For Full Book

Sr. # Questions Answers Choice
1 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
2 A grating with high resolving power can distinguish _______ difference in wavelengths : Larger Zero None of these Smaller
3 A grating with high resolving power can distinguish _______ difference in wavelengths : Smaller Larger Zero None of these
4 Resolving power in mth order diffraction for grating is given by: R = N x m None of these R = m/N R = N/m
5 Resolving power in mth order diffraction for grating is given by: R = N/m R = m/N R = N x m None of these
6 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
7 The focal length of convex lens having magnifying power of 5.55 is: 5.5 cm 5 cm 4.5 cm 6 cm
8 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
9 A magnifier gives an image which is: Virtual, inverted Real, erect Virtual, erect Real, inverted
10 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
11 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
12 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
13 The ratio of the size of the image to that of object is called: Focal length Aperture Linear magnification Principal axis
14 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
15 When the same object is viewed at a shorter distance, the image on the retina of the eye is _____ the so the object appears: Greater, smaller Smaller, smaller Smaller, larger Greater, larger
16 A virtual image is formed when object is placed: Within focal length of a convex lens Near the focal point of a concave lens Both A and B Away from 2F of a convex lens
17 For the virtual image, option _______ is not correct: 1/p = 1/f -1/q 1/f = 1/p -1/q 1/p=1/p-1/f 1/p=1/f+1/q
18 A ray passing through optical center of a lens, after refraction: Passes through focus Go deviated Retraces its path Both B and C
19 If the object and its image are located at a distance of 5 cm from the focus of a convex lens, the focus length of the lens will be: 5 cm 10 cm 20 cm 25 cm
20 Conventionally, all the distance p, q, f are measured from _____ of the lens: Focus Optical center Edges None of these
21 Least distance of distinct vision of an old man possibly becomes: A little less than 25 cm A little more than 25 cm Much less than 25 cm None of these
22 The ratio of the diameter of two convex lenses is _____-the ratio of their focal lengths: Greater than Less than Equal to None of these
23 If the focal length of the convex lens is 5 cm, then to get the real and inverted image of the same size as that of object, the object should be placed at: 15 cm 10 cm 20 cm 5 cm
24 If the focal length of the convex lens is 5 cm, then to get the real and inverted image of the same size as that of object, the object should be placed at: 5 cm 20 cm 10 cm 15 cm
25 How is the image formed by a convex lens affected if the upper half of the lens is covered with a paper: The upper half of the image is cut off The brightness of the image is reduced The brightness of the image is increased No effect at all
26 If the object is situated at focus of a convex lens, then its image is formed at: F 2F Infinity None of these
27 When the object lies between F and 2F, the image formed by is formed at: Virtual Diminished Erect Real
28 When the object lies between F and 2F, the image formed by is formed at: Real Virtual Diminished Erect
29 A convex lens acts as diverging lens when the object is placed: Beyond 2F At 2F With focal length Between F and 2F
30 A convex lens acts as diverging lens when the object is placed: Between F and 2F At 2F With focal length Beyond 2F
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