Science Physics MCQ-138 January 14, 2015admin0 Comments CategoriesScience-Physics Quizzes General Science-Physics online Exam SSC, CivilsPrelims, NDA, RBI, UPPSC, CDS, DelhiPolice, UPSC Exams Which of the following types is used by computed tomography employed for visualization of the internal structure of human body ? X sound waves magnetic resonance radio-isotopes Consider the following statements : (i) a flute of smaller length produces waves of lower frequency (ii) sound travels in rocks in the form of longitudinal elastic waves only. Which of the statements given above is / are correct ? 1 only 2 only both 1 and 2 neither 1 nor 2 Assertion (A): Radio waves bend in a magnetic field Reason (R) : Radio waves are electromagnetic in nature Codes: A and R are individually true and R is the correct explanation of A A and R are individually true, but R is not the correct explanation of A A is true, but R is false A is false, but R is true Pitch is sensation which depends upon frequency amplitude wavelength velocity When light waves pass from air to glass, the variables affected are wavelength, frequency and velocity velocity and frequency wavelength and frequency wavelength and velocity Consider the following statements(i) light of longer wavelength is scattered much more than the light of shorter wavelength (ii) The speed of visible light in water is 95 times the speed in vacuum (iii) Radio waves are produced by rapidly oscillating electrical currents (iv) To detect the over speeding vehicles, police use the Doppler effect of reflected short radio waves. Which of these statements are correct ? 1 and 2 1 and 3 2 and 4 3 and 4 Which one of the following types of glass can cut of ultraviolet rays ? soda glass Pyrex glass jena glass crookes glass Consider the following statements. (i) X-rays show transverse wave characteristics(ii) X-rays can eject electrons from certain metal Surfaces (iii) X-rays of 1 A are harder than X – rays of 2 A. Which of the statements given above is / are correct ? 1 only 1 and 2 only 2 and 3 only 1, 2 and 3 Why is sound heard with more intensity through CO2 than through the air ? density of CO2 is more than that of air density of CO2 is less than that of air air is a bad conductor Of heat CO2 is a compound, but air is a mixture of gases. If V1, V2 and V3 are the velocities of sound in steel, water and vacuum respectively, which one of the following relations is correct ? V1 < V2 < V3 V1 < V2 + V3 V1= V2 = V3 V1.V2.V3=0 A string 1m long is drawn by a vibrator attached to its end. The string vibrates in three segments. If the frequency of vibration of the vibrator is 480 Hz, then what is the speed of waves through the string ? 160 Hz 320 Hz 480 Hz 640 Hz Match List-I (type of electromagnetic radiation) with List-II (corresponding wavelength) and select the correct answer using the code given below List-I (A) Radio waves(B) Ultraviolet waves (C) Visible light (D) X-rays List-II 1 .4×10-7-7×10-7m2 .10-11-10-9 m3 .10-6 – 10-3 m4 .10-3 – 10-5 m5 .10-9 – 10-7 mCode: A B C D 3 2 4 5 4 5 1 2 3 5 4 2 4 2 1 5 Consider the following statements with reference to X-rays(1) They produce heat when absorbed by matter(2) They are generated when fast moving electrons strike a metal target(3) They can penetrate through a thin sheet of aluminum. Which of the statements given above are correct ? 1, 2 and 3 1 and 2 2 and 3 1 and 3 What is the frequency of a wave whose time-period is 05 second ? 5 Hz 10 Hz 20 Hz 40 Hz Consider the following statements (1) Sound waves are elastic waves(2) In sound waves, the vibrations are perpendicular to the direction in which the wave travels. Which of these statement is / are correct ? 1 only 2 only both 1 and 2 neither 1 nor 2 The velocity of sound produced by a vibrating body varies – directly as the sq. root of density of the medium inversely as the density of the medium directly as the sq. root of frequency of the medium inversely as the frequency of the medium A particle is executing simple harmonic motion. Its total energy is proportional to its- displacement from equilibrium position frequency of oscillation square of amplitude of motion velocity at equilibrium position A wave under goes reflection from a rigid boundary. One of its characteristic parameters that changes is frequency phase velocity wavelength X-rays are used for the study of crystal structure because X-rays are completely absorbed by the crystal The wavelength of X-rays is of the same order of magnitude as the inter atomic spacing in crystals The wavelength of X-rays is very small in comparison with the inter atomic spacing in crystals The crystals are completely transparent to X-rays The quality of a musical note depends upon its amplitude its frequency the wave velocity its harmonic content The velocities of sound in air and water are 336 m/sec and 1470 m/sec respectively. Two sources producing waves of wavelength 6 m and 7 m sounded together will produce beats that can be heard in both the media that can be heard only in water and not in air that can be heard only in air and not in water that can not be heard in either media The audible frequency range of a human ear is 20 hertz to 200 hertz 2 hertz to 20 hertz 200 hertz to 2000 hertz 20 hertz to 20000 hertz The wavelength of X-rays is of the order of 1 mm 1 cm 1 micron 1 angstrom In vacuum, the speed of light depends on its wavelength depends on its frequency depends on its intensity neither depends on its wavelength, frequency nor intensity. Consider the following parts of spectra (1) visible(2) infrared(3) ultraviolet(4) microwave Which one of the following is the correct sequence in which their wavelength in crease ? 4-3-1-2 4-1-2-4 3-2-1-4 3-1-2-4 Loading … Related posts: Civils General Science Questions-1 Civils General Science-4 General Science MCQ-2 General Science MCQ-6 General Science MCQ-8 Science Physics MCQ-103 Science Physics MCQ-137 Science Physics MCQ-57 Science Physics MCQ-39 Science Physics MCQ-148