JEE Main Physics MCQs - Part 4
Questions 31-40 of 10031. A convex lens of focal length 20 cm and a concave lens of focal length 25 cm are placed in contact. The power of the combination is:
32. In Young's double slit experiment, if the distance between the slits is halved and the distance between the slits and the screen is doubled, the fringe width becomes:
33. When light is incident on a transparent surface at the polarizing angle (Brewster's angle), the angle between the reflected and refracted rays is:
34. The de Broglie wavelength of an electron accelerated through a potential difference of 100 V is approximately:
35. The energy equivalent of 1 atomic mass unit (amu) is:
36. In a nuclear reactor, the function of a moderator is to:
37. Which logic gate is known as a universal gate?
38. A Zener diode is primarily used as a:
39. For a transistor in common emitter configuration, if the current gain β is 100, the current gain α in common base configuration is:
40. In amplitude modulation, if the maximum amplitude is 10 V and the minimum amplitude is 2 V, the modulation index is: