MDCAT Physics MCQ's Test With Answers

MDCAT Physics MCQ's Test

Sr. # Questions Answers Choice
1 Two sources of light are said to be coherent when the waves produced by them have Equal wavelength Equal amplitude Equal wavelength and constant phase difference Amplitude and wavelength are same
2 If light of low wavelength is used in Young's double slit experiment then width of the fine will Decreases Increase Not fixed No change
3 Two wave of intensities I an 4I superpose then the maximum and minimum intensities are 5I and 3I 9I and I 9I and 3I 5I and I
4 Which does not show polarization? Longitudinal waves in gas Transverse wave in gas Both A and B None of these
5 If a lens is cut into two piece perpendicular to the principal axis and only part is used the intensity of the image: Remains same 1/2 times 2 times Infinite
6 What is the main cause of the shinning of diamond? Reflection Refraction Total internal reflection Dispersion of light
7 Which of the following spectrum have all the frequencies from high to low frequency range? Band spectrum Continuous spectrum Line spectrum Discontinuous spectrum
8 All of the following statements are correct except The total focal length of an astronomical telescope is the sum of the focal lengths of its two lenses The image formed by the astronomical telescope is always erect because the effect of the combination of the two lenses is divergent The magnification of an astronomical telescope can be increased by decreasing the focal length of the eyepiece.
9 The length of a telescope is 36 cm.The focal lengths of its lenses can be 30 cm,6 cm -30 cm,-6 cm 30 cm,-6 cm -30 cm,-6 cm
10 To increase the magnification of a telescope The objective lens should be of large focal length and eyepiece should be of short focal length The objective and eyepiece both should be of large focal lengths Both the objective and eyepiece should be of smaller lengths The objective should be small focal length and eyepiece should be of large focal length
11 If tube length of astronomical telescope is 105 cm and magnifying power is 20 for normal setting calculate the focal length of objective 100 cm 10 cm 20 cm 25 cm
12 A planet is observed by an astronomical refracting telescope having an objective of focal length 16 m and an eyepiece of focal length 2 cm. The distance between the objective and the eyepiece is 8m The angular magnification of the planet is 200 The image of the planet is inverted The objective is smaller than the eyepiece
13 A lens behaves as a converging lens in air and a diverging lens in water the refractive index of the material is Equal to unity Equal to 1.33 Between unity and 1.33 Greater than 1.33
14 An object is placed at a distance of f/2 from a convex lens.The Image will be At one of the foci,virtual and double its size At,3/f real and inverted At 2f,virtual and erect At f,real and inverted
15 When the length of a microscope tube increases its magnifying power Decreases Increases Does not change May increase or decrease depending on the observer and the place of observation
16 A converging lens in used to from an image on a screen when the upper half of the lens is covered by an opaque screen Half the image will disappear No change either in size or in intersity Intensity of image will increase Intensity of the image will decrease
17 A fly is sitting on the objective of a telescope pointed towards the moon.What effect is expected on the photography of the moon taken through the telescope? The entire field of view blocked There is an image of the fly on the photography There is no effect at all There is a reduction in the intensity of the image
18 For destructive interference the path difference is give by: (m-1/2)λ (m+1/2)λ mλ 1/2 mλ
19 For constructive interference the path difference is mλ (m-1)λ m<sup>2</sup>λ 1/2mλ
20 For interference to occur,the interfering beams of light must be Of different frequencies Coherent White light Added
21 For interference to occur the two light waves should be: Of two different frequencies Coming from opposite directions Of high intensity Monochromatic
22 According to Huygen,every point on a wavefront may be regarded as a.........of secondary wavelets. Base Source Producer Origin
23 The direction of a ray of light is.......to the wave front. Parallel Equal Opposite Perpendicular
24 Consider telecommunication through optical fibers.Which of the following statements is not true? Optical fibers may have homogeneous core with a suitable cladding Optical fibers can be of graded refractive index Optical fibers are subject to electromagnetic interference from outside Optical fibers have extremely low transmission loss
25 In Young's double slit experiment,the separation between the slits is made 3 fold the fringe width becomes 1/3 times 1/9 times 3 times 9 times
26 Optic fibers are related with Communication Light Computer None of these
27 Sun has elliptical shape when it rises and sets due to Refraction Reflection Scattering Dispersion
28 Why laser rays are used to measure long distance? Laser rays propagate in a straight Laser rays are not absorbed Laser rays are most coherent waves Laser rays are high velocity waves
29 The difference between 1st ring fringe and 1st dark fringe is measured as λD/2d λD/d λD/4d 2λD/d
30 Which is having minimum wavelength? X-rays Ultra-violet rays Y-rays Cosmic rays
31 The cause of mirage observed in desert is Refraction Reflection Scattering Total internal reflection
32 Intensities of the two waves of light are I and 4I.The maximum intensity of the resultant wave after superposition is 5I 9I 16I 25I
33 Fraunhofer's lines commonly visible in the sun's spectrum are examples of Line emission spectrum Line absorption spectrum Band emission spectrum Band absorption spectrum
34 On a rainy day if there is an oil drop on tar road colored rings are seen around this drop This is because of Interference pattern produced due to thin oil film Diffraction pattern Polarization Total internal reflection of light
35 The light produced by a laser is all the following except Incoherent Monochromatic In the form of a narrow beam Electromagnetic
36 A spectrum which contains all wavelengths without any break is called Emission spectrum Line spectrum Continuous emission spectrum All of them
37 In Huygen's wave theory the locus of all points in the same state of vibration is called A half-period zone Vibrator Wave front A ray
38 The velocity of light in vacuum can be changed by changing Frequency Amplitude Wavelength None of these
39 Choose the correct statement Rays are normal to wave front Rays may be normal to wave front Rays are not normal to wave front There is no relationship between rays and wave fronts
40 The splitting of white light into several colors on passing through a glass prism is due to Refraction Reflection Interference Diffraction
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