MDCAT Physics MCQ's Test With Answers

MDCAT Physics MCQ's Test

Sr. # Questions Answers Choice
1 In order to observe interference , the interfering beams must be monochromatic coherent either of them both of them
2 A monochromatic source of light gives light of one colour two colours four colours seven colours
3 Light waves produce interference when source are monochromatic source are phase coherent sources are close together all of them
4 When two light waves travelling in the same direction are out of phase at any point, their resultant amplitude increases decreases remains unchanged increases rapidly
5 When the light waves of the same frequency and amplitude travelling in the same direction superimose each other , they give rise to interference diffraction dispersion polarization
6 When two lights waves travelling in the same direction are in phase at any point, they producing constructive interference destructive interference dispersion polarization
7 The medium in which speed of light is the same in all directions is called non-homogeneous medium homogeneous medium both of them empty medium
8 According to the Huygen's principle, the secondary wavelets propagate in the forward direction with a speed equal to speed of wave motion speed of medium speed of electrons speed of protons
9 Huygen's principle is used to study the formation of wavefronts propagation of wavefronts nature of light speed of light
10 The wave nature of light was first proposed by Huygen Thomas Young Newton Compton
11 According to Huygen's principle, the new position of the wavefront after a time can be found by constructing a surface that touches all the primary wavelets secondary wavelets either of them none of them
12 According to Huygen's principle, every point of a wavefront may be considered as a source of primary wavelets secondary wavelets either of them both of them
13 By which principle we can locate the position of new wavefront after a later time? principle of irreversibility principle of light Archimedes principle Huygen's principle
14 A usual way to obtain a plane wave is to place point source of light at the focus of a concave lens convex lens both of them either of them
15 In the study of interference and diffraction, we consider plane waves plane wavefronts both of them none of them
16 The light form Sun reaches earth in the form of plane wavefront circular wavefront spherical wavefront elliptical wavefront
17 A limited region taken on a wavefront which is far away form the source is plane wavefront circular wavefront spherical wavefront elliptical wavefront
18 The distance between the concentric wavefronts is half wavelength one wavelength one and a half wavelength none of them
19 The waves propagate in space by the motion of the wavelengths frequencies wavefronts none of them
20 A line normal to the wavefront including the direction of motion is called perpendicular line parallel line a ray of light none of them
21 In case of a point source, the shape of the wavefront is straight elliptical oval spherical
22 Such a surface on which all the points have the same phase of vibration is known as wavefront amplitude displacement all of them
23 Which characteristics of wave, established the Huygen's wave theory in 1801? polarization interference propagation all of them
24 The experimental evidence in support of wave theory in Huygen's time was not present not convincing convincing none of them
25 Who proposed that light energy form a luminous source travels in space by means of wave motion? Newton Maxwell Einstein Huygen
26 The ratio of kinetic energy to potential energy for solids is
27 Which of the following pairs is not correct Strain - dimensional Stress - N/m<sup>2</sup> Modulus of elasticity - N/m<sup>2</sup> Shear stress - N/m<sup>2</sup>
28 Which of the following is not dimension less Poission ration Sharing strain Longitudinal strain Volume stress
29 The modulus of elasticity of material does not depend upon Shape Temperature Nature of material Impurities mixed
30 Longitudinal strain can be produced in Glass Water Honey Hydrogen gas
31 If the tensile force is suddenly removed from a wire then its temperature will Decrease Increase Become zero Remain constant
32 The Hook's law defines Modulus of elasticity Stress Strain Elastic limit
33 The shearing strain is measured by Angle of rotation Shearing stress Angle of shear Modulus of rigidity
34 If S is the stress and Y is Young's modulus of the material of a wire, the energy stored in the wire per unit volume is 2 S<sup>2</sup>Y S<sup>2</sup>/2Y 2Y/S<sup>2</sup> S/2Y
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36 On applying a stress of 20 x 108Nm-2, the length of perfectly elastic wire is doubled. Its young' modulus is 40 x 10<sup>8 </sup>N/m<sup>2</sup> 20 x 10<sup>8</sup>N/m<sup>2</sup> 10 x 10<sup>8</sup>N/m<sup>2</sup> 5 x 10<sup>8</sup>N/m<sup>2</sup>
37 A certain force F increases the length of a wire by 1 mm. The force required to increase its length by 2mm is 2 F 4 F 8 F 16 F
38 A bar of length L, cross-section A and Young's modulus Y, is pulled by a force F from both ends so as to produce an elongation x. Then: x<span style="color: rgb(34, 34, 34); font-family: &quot;Times New Roman&quot;; font-size: 24px; text-align: center; background-color: rgb(255, 255, 224);"><i>∝</i></span>1/L x<span style="color: rgb(34, 34, 34); font-family: &quot;Times New Roman&quot;; font-size: 24px; text-align: center; background-color: rgb(255, 255, 224);"><i>∝</i></span>A x<span style="color: rgb(34, 34, 34); font-family: &quot;Times New Roman&quot;; font-size: 24px; text-align: center; background-color: rgb(255, 255, 224);"><i>∝</i></span>1/A x<span style="color: rgb(34, 34, 34); font-family: &quot;Times New Roman&quot;; font-size: 24px; text-align: center; background-color: rgb(255, 255, 224);"><i>∝</i></span>Y
39 The young's modulus of a wire of length L and radius 'r' is Y. If the length is reduced to L/2 and radius to r/2, its Young's modulus will be Y/2 Y 2Y 4Y
40 Energy per unit volume of a stretched wire is (1/2) x load x extension Load x stress Stress x strain (1/2) x stress x strain
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