181. A cylinder cannot roll on :
A. A rough horizontal plane
B. A smooth horizontal plane
C. A rough inclined plane
D. A smooth inclined plane
182. For a body moving with constant speed in a horizontal circle, which of the following remains constant?
A. Velocity
B. Centripetal force
C. Acceleration
D. Kinetic energy
183. A source of sound moves towards a stationary observer with a speed of sound. If the frequency of sound from the source is 100 Hz, the apparent frequency of the sound heard by the observer is :
A. 75 Hz
B. 100 Hz
C. 150 Hz
D. None
184. Two sound waves having frequency 200 Hz and 250 Hz are traveling in air. The speed of sound of 250 Hz is:
A. Greater than the speed of 200 Hz
B. Less than the speed of 200 Hz
C. Equal to the speed of 200 Hz
D. None
185. An organ pipe of length ‘L’ has one end closed and the other end open. The wavelength of the fundamental note emitted is :
A. Slightly smaller than 4 L
B. Slightly greater than 4 L
C. Exactly equal to 3L/4
D. Slightly larger than 2 L
186. Two progressive waves each of frequency 300 Hz are Superimposed to produce a stationary wave in which adjacent nodes are 1.5 m apart. The speed of the wave is :
A. 100 m/sec
B. 200 m/sec
C. 450 m/sec
D. 900 m/sec
187. Where in standing waves do the vibrations of the medium occur?
A. Only at the nodes
B. Only at the antinodes
C. At every point between the antinodes and nodes
D. At all the points between anti nodes
188. The lower the frequency of the wave :
A. The higher its velocity
B. The smaller its wavelength
C. The smaller its amplitude
D. The higher its period
189. An entirely longitudinal wave is :
A. A water wave
B. A sound wave
C. An electromagnetic wave
D. A Wave in a stretched string
190. The wavelength of 400 Hz sound waves in air relative to the wavelength of 800 Hz sound waves in air is :
A. Half as long
B. The same
C. Twice
D. 4 times as long
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