Question : Vibration of which among the following produces only odd harmonics?
Option 1: A vibrating rod fixed at two ends
Option 2: A vibrating string fixed at two ends
Option 3: An air column in a closed organ pipe
Option 4: An air column in an open organ pipe
Correct Answer: An air column in a closed organ pipe
Solution : The correct answer is An air column in a closed organ pipe.
Physics demonstrates that in the situation of an air column vibrating in a pipe closed at one end, the only harmonics present as overtones are odd. An antinode at the open end and a node at the closed end are the two boundary conditions that need to be satisfied in this scenario for the stationary waves in the air column.
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Question : The instrument used to study the laws of vibrating string is:
Option 1: hydrometer
Option 2: sonometer
Option 3: sphygmomanometer
Option 4: electrometer
Question : The instrument used to study the behaviour of vibrating string is
Option 1: Barometer
Option 2: Hydrometer
Option 3: Hygrometer
Option 4: Sonometer
Question : Who among the following invented a device called PM 2.5 which when fitted near the silencer pipe in vehicles will curb air pollution?
Option 1: Debayan Saha
Option 2: Deepak Gupta
Option 3: Nikesh Arora
Option 4: Asha Sharma
Question : Which among the following is an "action-at-a-distance" force?
Option 1: Tension
Option 2: Pull
Option 3: Gravitation
Option 4: Friction
Question : Pipes A, B and C can fill an empty tank in $\frac{30}{7}$ hours if all three pipes are opened simultaneously. A and B are filling pipes and C is an emptying pipe. Pipe A can fill the tank in 15 hours and pipe C can empty it in 12 hours. In how much time (in hours) can pipe B alone fill the empty tank?
Option 1: 3
Option 2: 5
Option 3: 6
Option 4: 4
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