Physics questions
20027 published questions with worked solutions.
- A body cools from 100℃ to 70℃ in 8 minutes. If temperature of surrounding is 15℃, then time required for body cools from 70℃ to...
- An object of cooled from 75 ℃ to 65 ℃ in 2 minutes in a room at 30 ℃. The time taken to cool another object from 55℃ to 45℃ in...
- 100 g of water is heated from 30℃ to 50℃ ignoring the slight expansion of the water, the change in its internal energy is...
- A gaseous mixture consists of 16 g of helium and 16 g of oxygen. The ratio C_p C_v of the mixture is
- Statement 1: Thermodynamic processes in nature are irreversible Statement 2: Dissipative effects cannot be eliminated
- Statement 1: In an isolated system, the entropy increases Statement 2: The processes in an isolated system are adiabatic
- A given mass of an ideal gas is at pressure P and absolute temperature T. The isothermal bulk modulus of gas is given by
- Consider a spherical shell of radius R at temperature T. The black body radiation inside it can be considered as an ideal gas of...
- Two cylinders A and B fitted with pistons contain equal amounts of an ideal diatomic gas at 300 K. The piston of A is free to...
- A reversible engine converts one third input into work. When the temperature of the sink is reduced by 62℃, then efficiency of...
- One mole of an ideal gas at temperature T is cooled isochorically till the gas pressure drops from P to P n . Then, the gas was...
- A black pattern on a porcelain bowl appears brighter than the rest of bowl, when it is strongly heated and taken to a dark room....
- For an ideal gas, The change in internal energy in a constant pressure process from temperature T_1 to T_2 is
- One mole of an ideal gas requires 207 J heat to raise the temperature by 10 K, when heated at constant pressure. If the same gas...
- A flask is filled with 10 g of a gas at 20^ and then heated to 50^ . As some quantity of gas escaped, the pressure in the flask...
- Two bodies A and B having same surfaces areas have emmissivities of 0.01 and 0.49 respectively. The two bodies emit total radiant...
- Statement 1: Equal volumes of monoatomic and polyatomic gases are adiabatically compressed separately to equal compression ratio...
- A certain mass of an ideal gas undergoes a reversible isothermal compression. When compared with their initial state, Its...
- An ideal black-body is at room temperature. If it is thrown into a furnace, it will be observed that
- The pressure p for a gas is plotted against its absolute temperature T for two different volumes V_1 and V_2, where V_1 > V_2. If...