191. Waves whose crest are 30 m apart reach the shore once every 3.0 sec. The wave velocity is :
A. 0.1 M/SEC
B. 5 M/SEC
C. 10 M/SEC
D. 900 M/SEC
192. When light enters from airinto glass, then which of the following will not change :
A. Wavelength
B. Speed
C. Frequency
D. Intensity
193. During refraction of light, the quality of _ is not changed.
A. Its frequency
B. Its wavelength
C. Its speed
D. Its direction
194. For a normal person, the audible frequency range for sound waves lies between?
A. 10 Hz to 10 Khz
B. 20 Hz to 20 Khz
C. 25 Hz to 25 Khz
D. 30 Hz to 30 Khz
195. A device that can be used to produce both Transverse and Longitudinal waves is called?
A. Ripple tank
B. A string
C. Helical spring
D. Tuning fork
196. The characteristic of a wave that is independent of the others is called?
A. Frequency
B. Amplitude
C. Wavelength
D. Speed
197. What is the equation of Joule’s law?
A. W=I2Rt
B. W=IR2t
C. W=IRt2
D. W=IR
198. What is the unit of capacitance?
A. Farad
B. Volt
C. Watt
D. Ampere
199. Sound is a form of which type of energy?
A. Mechanical
B. Electrical
C. Thermal
D. Chemical
200. A doctor counts 72 heartbeats in 1 minute. Its time period is?
A. 0.83 second
B. 1.2 seconds
C. 60 seconds
D. 72 seconds
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