Physics questions
20027 published questions with worked solutions.
- The rms speed of oxygen molecule in a gas is u, if the temperature is doubled and the molecules dissociates into two atoms, the...
- The molar specific heat of an ideal gas at constant pressure and constant volume is C_p and C_V, respectively. If R is the...
- Heat energy is incident on the surface at the rate of 1000 J/min . If coefficient of absorption is 0.8 and coefficient of...
- For a rigid diatomic molecule, universal gas constant R = nC_p, where C_p is the molar specific heat at constant pressure and n...
- An ideal gas has pressure p, volume V and absolute temperature T. If m is the mass of each molecule and K is the Boltzmann...
- Assuming the expression for the pressure exerted by the gas on the walls of the container, it can be shown that pressure is...
- A black rectangular surface of area A emits energy E per second at 27^ C . If length and breadth are reduced to ( 1 3 )rd of...
- A black body radiates heat at temperatures T_1 and T_2 (T_2 > T_1). The frequency corresponding to maximum energy is [MHTCET 2015]
- Gases exert pressure on the walls of the container, because the gas molecules [MHTCET 2014]
- A gas is compressed isothermally. The rms velocity of its molecules [MHTCET 2014]
- A piece of iron is heated in a flame. If first becomes dull red, then becomes reddish yellow and finally turns to white hot. The...
- A black body at a temperature of 227^ C radiates heat energy at the rate 5 cal/cm^2 - s . At a temperature of 727^ C , the rate...
- A vessel is filled with an ideal gas at a pressure of 10 atm and temperature 27^ C . Half of the mass is removed from the vessel...
- KE per unit volume is E. The pressure exerted by the gas is given by [MHTCET 2010]
- The velocity of 4 gas molecules are given by 1 km/s , 3 km ,s^ -1 , 5 km ,s^ -1 and 7 km ,s^ -1 , Calculate the difference...
- The sphere of radii 8 cm and 2 cm are cooling. Their temperatures are 127^ C and 527^ C , respectively. Find the ratio of energy...
- At what temperature, rms speed of air molecules is doubled of that at NTP? [MHTCET 2009]
- To what temperature should the hydrogen at 327^ C be cooled at constant pressure, so that the root mean square velocity of its...
- If 150 J of energy is incident on area 2 m^2 . If Q_r = 15 J , coefficient of absorption is 0.6, then amount of energy...
- The unit of Wien's constant b is [MHTCET 2009]