Physics-
General
Easy
Question
How many times more intense is 90 dB sound than 40 dB sound?
- 5
- 50
- 500
- 105
The correct answer is: 105
Related Questions to study
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A wave pulse on a string has the dimension shown in figure. The waves speed is v = 1 cm/s. If point O is a free end. The shape of wave at time t = 3 s is :
A wave pulse on a string has the dimension shown in figure. The waves speed is v = 1 cm/s. If point O is a free end. The shape of wave at time t = 3 s is :
physics-General
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A pulse shown here is reflected from the rigid wall A and then from free end B. The shape of the string after these 2 reflection will be
A pulse shown here is reflected from the rigid wall A and then from free end B. The shape of the string after these 2 reflection will be
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A block of mass 1 kg is hanging vertically from a string of length 1 m and mass/length = 0.001 Kg/m. A small pulse is generated at its lower end. The pulse reaches the top end in approximately
A block of mass 1 kg is hanging vertically from a string of length 1 m and mass/length = 0.001 Kg/m. A small pulse is generated at its lower end. The pulse reaches the top end in approximately
physics-General
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Figure shown the shape of part of a long string in which transverse waves are produced by attaching one end of the string to tuning fork of frequency 250 Hz. What is the velocity of the waves?
Figure shown the shape of part of a long string in which transverse waves are produced by attaching one end of the string to tuning fork of frequency 250 Hz. What is the velocity of the waves?
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The equation of a wave travelling along the positive x-axis, as shown in figure at t = 0 is given by
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An enclosed ideal gas is taken through a cycle as shown in the figure. Then
An enclosed ideal gas is taken through a cycle as shown in the figure. Then
physics-General
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Two moles of monoatomic gas is expanded from (P0 , V0 ) to (P0 , 2V0 ) under isobaric condition. Let DQ1 , be the heat given to the gas, DW1 the work done by the gas and DU1 the change in internal energy. Now the monoatomic gas is replaced by a diatomic gas. Other conditions remaining the same. The corresponding values in this case are 
, 
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respectively, then
Two moles of monoatomic gas is expanded from (P0 , V0 ) to (P0 , 2V0 ) under isobaric condition. Let DQ1 , be the heat given to the gas, DW1 the work done by the gas and DU1 the change in internal energy. Now the monoatomic gas is replaced by a diatomic gas. Other conditions remaining the same. The corresponding values in this case are , , respectively, then
physics-General
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A student records 
for a thermodynamic cycle 
. Certain entries are missing. Find correct entry in following options.
A student records for a thermodynamic cycle . Certain entries are missing. Find correct entry in following options.
physics-General
physics-
Figure shows the pressure P versus volume V graphs for two different gas sample at a given temperature. MA and MB are masses of two samples, nA and nB are numbers of moles. Which of the following must be incorrect.
Figure shows the pressure P versus volume V graphs for two different gas sample at a given temperature. MA and MB are masses of two samples, nA and nB are numbers of moles. Which of the following must be incorrect.
physics-General
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An ideal gas expands in such a way that PV2 = constant throughout the process.
An ideal gas expands in such a way that PV2 = constant throughout the process.
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A process is shown in the diagram. Which of the following curves may represent the same process ?
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A resistance coil connected to an external battery is placed inside an adiabatic cylinder fitted with a frictionless piston and containing an ideal gas. A current i flows through the coil which has a resistance R. At what speed must the piston move upward in order that the temperature of the gas remains unchanged? Neglect atmospheric pressure.
A resistance coil connected to an external battery is placed inside an adiabatic cylinder fitted with a frictionless piston and containing an ideal gas. A current i flows through the coil which has a resistance R. At what speed must the piston move upward in order that the temperature of the gas remains unchanged? Neglect atmospheric pressure.
physics-General
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Considere the thermodynamics cycle shown on PV diagram. The process 
is isobaric, 
is isochoric and C →A is a straight line process. The following internal energy and heat are given 
= – 500 kJ The heat flow in the process 
is :
Considere the thermodynamics cycle shown on PV diagram. The process is isobaric, is isochoric and C →A is a straight line process. The following internal energy and heat are given = – 500 kJ The heat flow in the process is :
physics-General
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A cyclic process ABCA is shown in PT diagram. When presented on PV, it would
A cyclic process ABCA is shown in PT diagram. When presented on PV, it would
physics-General
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An ideal gas undergoes a thermodynamics cycle as shown in figure. Which of the following graphs represents the same cycle?
An ideal gas undergoes a thermodynamics cycle as shown in figure. Which of the following graphs represents the same cycle?
physics-General
