Physics questions
20027 published questions with worked solutions.
- Three black discs x, y, z have radii 1 m, 2 m and 3 m respectively. The wavelength corresponding to maximum intensity are 200 nm,...
- At 273°C, the emissive power of a perfect black body is 'R'. Its emissive power at 0°C is [MHT-CET 2020]
- The average translational kinetic energy of 'N' molecules in a gas is 'E_1'. The kinetic energy of the electron (e) accelerated...
- A star (P) behaves like a perfectly black body emitting radiant energy at temperature 'T'. Another star (Q) also behave like...
- For monoatomic gas work done at constant pressure is 'W'. For the same rise in temperature of the gas, the heat supplied at...
- In a black body radiation, which one of the following is the WRONG statement? [MHT-CET 2020]
- The translational kinetic energy of the molecules of a gas at absolute temperature (T) can be doubled by [MHT-CET 2019]
- When the rms velocity of a gas is denoted by 'V', which of the following relations is true? (T = absolute temperature of the gas)...
- 22 g of carbon dioxide at 27°C is mixed in closed container with 16 g of oxygen at 37°C. If both gases are considered as ideal...
- Three discs x, y and z having radii 2 m, 3 m and 6 m respectively are coated on outer surfaces. The wavelength corresponding to...
- The average force applied on the walls of the closed container depends on T^x where 'T' is the temperature of an ideal gas. The...
- If the r. m. s. speed of gas molecules is 400 m/s, then the density of that gas at N. T. P. in kg/m^3 is [Take atmospheric...
- One mole of a diatomic gas does a work ' Q 3 ' when the amount of heat supplied is 'Q'. In this process, the molar heat capacity...
- When an ideal diatomic gas is heated at constant pressure, the fraction of the heat energy supplied which increases the internal...
- At which of the following temperatures would the molecules of a gas have twice the average kinetic energy they have at 20°C?...
- Rate of radiation by a black body is 'R' at temperature 'T'. Another body has same area but emissivity is 0.2 and temperature...
- Certain amount of an ideal gas is contained in a closed vessel. The vessel is moving with a constant velocity v. The rise in...
- A jar 'P' is filled with a gas by parameters P, V and T, another jar 'Q' filled with a gas with parameters 2P, V 4 , and 2T,...
- Ratio of specific heats ( C_P C_v ) for a gas is always [MHT-CET 2019]
- 70 calories of heat are required to raise the temperature of 2 moles of an ideal gas at constant pressure from 30°C and 35°C. The...