TATA Steel TA2018
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Question 1 of 2
1. Question
Category: PhysicsWhich of the following observer is/are non inertial
Correct 4 / 4PointsSince centripetal acceleration is present in merry round it is non inertial frame of reference
Since bus is slowing down to a stop, it means it is experiencing a retardation, so it is non inertial frame of reference
Hence choice (a) and (c) are correctIncorrect / 4 PointsSince centripetal acceleration is present in merry round it is non inertial frame of reference
Since bus is slowing down to a stop, it means it is experiencing a retardation, so it is non inertial frame of reference
Hence choice (a) and (c) are correct 
Question 2 of 2
2. Question
Loud sound can travel a larger distance, due to
Correct
The speed of sound is affected by temperature in a given medium. For air at sea level, the speed of sound is given by
vw=(331 m/s)√T273 Kvw=(331 m/s)T273 K,
where the temperature (denoted as T ) is in units of kelvin. The speed of sound in gases is related to the average speed of particles in the gas, vrms, and that
vrms=√3kTmvrms=3kTm,
where k is the Boltzmann constant (1.38 × 10−23 J/K) and m is the mass of each (identical) particle in the gas. So, it is reasonable that the speed of sound in air and other gases should depend on the square root of temperature. While not negligible, this is not a strong dependence. At 0ºC , the speed of sound is 331 m/s, whereas at 20.0ºC it is 343 m/s, less than a 4% increase. Figure 3 shows a use of the speed of sound by a bat to sense distances. Echoes are also used in medical imaging.Incorrect
The speed of sound is affected by temperature in a given medium. For air at sea level, the speed of sound is given by
vw=(331 m/s)√T273 Kvw=(331 m/s)T273 K,
where the temperature (denoted as T ) is in units of kelvin. The speed of sound in gases is related to the average speed of particles in the gas, vrms, and that
vrms=√3kTmvrms=3kTm,
where k is the Boltzmann constant (1.38 × 10−23 J/K) and m is the mass of each (identical) particle in the gas. So, it is reasonable that the speed of sound in air and other gases should depend on the square root of temperature. While not negligible, this is not a strong dependence. At 0ºC , the speed of sound is 331 m/s, whereas at 20.0ºC it is 343 m/s, less than a 4% increase. Figure 3 shows a use of the speed of sound by a bat to sense distances. Echoes are also used in medical imaging.