Physics questions
20027 published questions with worked solutions.
- The change in the internal energy of the mass of gas, when the volume changes from 'V' to '2V' at constant pressure 'P' is ( is...
- Two spheres P and Q of same color having radii 8 cm and 2 cm kept at temperature 127^ C and 527^ C respectively. The ratio of the...
- If the masses of all the molecules of a gas are doubled and their speeds are halved, the ratio of the final and initial pressures...
- Assuming the expression for the pressure exerted by the gas, it can be shown that pressure is [MHT-CET 2022]
- Out of the following, which statement is NOT true about black body radiation? [MHT-CET 2022]
- The emissive power of sphere of area 0.04 m^2 is 0.7 k cal s^ -1 m^ -2 . The amount of heat radiated in 20 second is [MHT-CET...
- The change in internal energy of the mass of a gas, when the volume changes from 'V' to '2V' at constant pressure 'P' is ( =...
- If the pressure of an ideal gas is decreased by 10% isothermally, then its volume will [MHT-CET 2022]
- An ideal gas having molar mass 'M_0', has r. m. s. velocity 'V' at temperature 'T'. Then [MHT-CET 2022]
- For a perfectly black body, coefficient of emission is [MHT-CET 2022]
- A perfectly black body emits a radiation at temperature 'T_1' K. If it is to radiate at 16 times this power, its temperature...
- Specific heats of an ideal gas at constant pressure and volume are denoted by C_p and C_v respectively. If =C_p/C_v and R it's...
- For a monoatomic gas, work done at constant pressure is W. The heat supplied at constant volume for the same rise in temperature...
- Two stars 'P' and 'Q' emit yellow and blue light respectively. The relation between their temperatures (T_P and T_Q) is [MHT-CET...
- A perfect gas of volume 10 litre n compressed isothermally to a volume of 1 litre. The rms speed of the molecules will [MHT-CET...
- A star acting is a black body has radius 'R'. What would be the temperature of star if the rate of production of energy is 'Q'? (...
- The velocities of 4 molecules of a perfect gas are 2 m/s, 4 m/s, 5 m/s and 6 m/s respectively. The difference between their rms...
- Two spherical black bodies have radii 'R_1' and 'R_2'. Their surface temperature are T_1 K and T_2 K respectively. If they...
- Kirchhoff's law of radiation proves that [MHT-CET 2021]
- The energy spectrum of a black body exhibits a maximum around a wavelength ' '. The temperature of a black body is now changed...