NAT II Physical Science Physics With Answers

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NAT II Physical Science Physics

Sr. # Questions Answers Choice
1 In Young's experiment, two coherent sources are placed 0.90 mm apart and the fringes are observed one metre away. If its produces the second dark fringe at a distance of 1 mm from the central fringe, the wavelength of monochromatic light used would be 60 x 10<sup>-4</sup>cm 10 x 10<sup>-4</sup>cm 10 x 10<sup>-5</sup>cm 6 x 10<sup>-5</sup>cm
2 If yellow light emitted by sodium lamp in Young's double slit experiment is replaced by monochromatic blue light of the same intensity Fringe width will decrease Fringe width will increase The fringe width will remain unchanged Fringes will becomes less intense
3 Which one of the following phenomena is not explained by Hugen's construction of wavefront? Refraction Reflection Diffraction Origin of sepectra
4 Which one of the following phenomena is not explained by Huygen's construction of wavefront? Refraction Reflection Diffraction Origin of spectra
5 Light appears to travel in straight lines since It is not absorbed by the atmosphere It is reflected by the atmosphere Its wavelength is very small Its velocity is very large
6 The twinkling of stars is due to The fact that stars do not emit light continuously The refractive index of the earth's atmosphere fluctuate Intermittent absorption of star light by its own atmosphere None of these
7 A prism splits a beam of white light into its seven constituent colors. This is so because Phase of different colors is different Amplitude of different colors is different Energy of different colors is different Velocity of different colors is different
8 A sun rise or sun set, the sun looks reddish because: The sun is coldest at these times Of the effects of reflection and refraction The sun is hottest at these times Of the scattering of light
9 One cannot see fog because Fog absorbs light The refractive index of fog is infinity Light suffers total reflection at the droplet in a fog Light is scattered by the droplet in fog
10 Mechanical waves on the surfaces of a liquid are Transverse Longitudinal Torsional both transverse and longitudinal
11 Velocity of sound in a diatomic as is 300 m/sec, what is its rms velocity? 400 m/sec 40 m/sec 430 m/sec 300 m/sec
12 At a certain instant a stationary transverse wave is found to have maximum kinetic energy. The appearance of string of that instant is: Sinusoidal shape with amplitude A/3 Sinusoidal shape with amplitude A/2 Sinusoidal shape with amplitude A Straight line
13 With the propagation of a longitudinal wave through a material medium, the quantities transmitted in the propagation direction are Energy, momentum and mass Energy Energy and mass Energy and linear momentum
14 If the amplitude of sound is doubled and the frequency reduced to one-fourth, the intensity of sound at the same point will be Increasing by a factor of 2 Decreasing by a factor of 2 Decreasing by a factor of 4 Unchanged
15 For production of beats the two sources must have Different frequencies and same amplitude Different frequencies Different frequencies, same amplitude and same phase Different frequencies and same phase
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