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Showing posts with label NEET 2018. Show all posts
Showing posts with label NEET 2018. Show all posts

109. In the combination of the following gates the output Y can be written in terms of inputs A and B as ?

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56. In a p-n junction diode, change in temperature due to heating ___ ?

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36. Unpolarised light is incident from air on a plane surface of a material of refractive index ’ μ ’. At a particular angle of incidence ’ i ’, it is found that the reflected and refracted rays are perpendicular to each other. Which of the following options is correct for this situation ?

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19. In Young’s double slit experiment the separation d between the slits is 2 mm, the wavelength λ of the light used is 5896Å and distance D between the screen and slits is 100 cm. It is found that the angular width of the fringes is 0.20°. To increase the fringe angular width to 0.21° (with same λ and D) the separation between the slits needs to be changed to ?

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76. An astronomical refracting telescope will have large angular magnification and high angular resolution, when it has an objective lens of ?

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64. The refractive index of the material of a prism is √2 and the angle of the prism is 30°. One of the two refracting surfaces of the prism is made a mirror inwards, by silver coating. A beam of monochromatic light entering the prism from the other face will retrace its path (after reflection from the silvered surface) if its angle of incidence on the prism is ?

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The electrostatic force between the metal plates of an isolated parallel plate capacitor C having a charge Q and area A, is ?

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An electron falls from rest through a vertical distance h in a uniform and vertically upward directed electric field E. The direction of electric field is now reversed, keeping its magnitude the same. A proton is allowed to fall from rest in it through the same vertical distance h. The time of fall of the electron, in comparison to the time of fall of the proton is ?

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A toy car with charge q moves on a frictionless horizontal plane surface under the influence of a uniform electric field E. Due to the force qE , its velocity increases from 0 to 6 m/s in one second duration. At that instant the direction of the field is reversed. The car continues to move for two more seconds under the influence of this field. The average velocity and the average speed of the toy car between 0 to 3 seconds are respectively ?

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