Science Physics MCQ-180 January 14, 2015admin0 Comments CategoriesScience-Physics Quizzes Science-Physics MCQ Quiz for NDA/Na,SSC CGL,UPPSC,JKPSC,CivilsPrelims Exams When mechanical waves have a frequency below the audible range, they are called : spnics infrasonics ultrasonics supersonics Which waves are used in sonography? microwaves infra-red rays sound wave ultrasonic waves The sound carried by air from a sitar to a listener is a wave of the following type : longitudinal stationary transverse progressive transverse stationary longitudinal progressive Sound waves do not show in air : polarisation diffraction refraction reflection With the rise of temperature, the velocity of sound: decreases remains the same increases is independent of temperature Velocity of sound will be : smaller in moist air than in dry air greater in moist air than in dry air same in moist and dry air independent of in density The velocity of sound is largest in : water air steel vacuum Supersonic planes fly : with the speed less than the speed of sound with the speed of sound with the speed greater than the speed of sound with the speed of light Resonance is an example of: tuning fork free vibration damped vibration forced vibration Buzzing of a mosquito is : loud sound shrill sound flat sound sweet sound Quality of sound depends upon its : wavelength frequency amplitude overtone Pitch of sound depends upon it; wavelength frequency amplitude periodicity and regularity Decibel is: a musical instrument a measure of sound level a musical noise the wavelength of noise The law applicable for determining the apparent change in frequency when a source and an observer are in motion is : Doppler’s law Huygens’s law Newton’s law Galileo’s law Doppler’s effect of sound is produced when the source and the observer are : moving in relative motion stationary resonance phenomenon The Doppler effect is applicable for : light waves only sound waves only both light and sound waves none of the above To a stationary man the frequency of a sound source moving towards the man appears to be : lower than the original frequency same as the original frequency higher than the original frequency lower as well higher than the original frequency depending upon the speed of the source The main cause of difference between Doppler effect in sound and light is : Photoelectric effect Dual nature of light Einstein’s mass energy relation Einstein’s theory of relativity When a sound source is in motion and observer is at rest then the cause of apparent change in frequency is : change in the wavelength of sound change in velocity of sound source change in the intensity of sound due to change in motion of sound source Which of the following is not the use of Doppler effect? SONAR RADAR in assessing the velocity of satellite in Astronomy Which quantity remains constant in the phenomenon of refraction? Speed of light Intensity of light Wavelength of light Frequency of light The absolute refractive index is maximum for: diamond glass glycerin water The inference derived from the refraction of light is that: the speed of light is different in different media light travels in straight lines the spectrum of light is discrete light is a form of energy The Plank’s Quantum theory was experimentally verified by : de-Broglie Hertz Young Newton As a result of hole in the ozone belt: harmful ultraviolet rays are going from earth to outer space harmful UV-rays are coming to earth the sunlight is reaching the earth in less time the heat radiation are not incident normally on earth surface Loading … Related posts: General Science MCQ-6 Civils General Science Questions-1 General Science MCQ-2 Science Physics MCQ-103 Science Physics MCQ-39 Science Physics MCQ-57 Science Physics MCQ-89 Science Physics MCQ-138 Science Physics MCQ-137 Science Physics MCQ-158