Physics questions
20027 published questions with worked solutions.
- When an ideal monoatomic gas is heated at constant pressure, the fraction of the heat energy supplied which increases the...
- Work done per mol in isothermal change is
- The specific heat of hydrogen gas at constant pressure is C_p=3.4 10^3 cal/kg °C and at constant volume is C_v=2.4 10^3 cal/kg...
- Which of the following processes is reversible?
- An ideal heat engine working between temperature T_1 and T_2 has an efficiency . The new efficiency, if both the source and sink...
- Which of the following statements is correct for any thermodynamic system?
- Which of the following statements is correct in terms of increasing work done for the same initial and final state?
- When 1 g of water at 0°C and 1 10^5 N/m^2 pressure is converted into ice of volume 1.091 cm^3 , the external work done will be
- In an adiabatic expansion,
- For an isothermal expansion of a perfect gas, the value of P P is equal to
- If R is universal gas constant, then the amount of heat needed to raise the temperature of 3 moles of a monoatomic gas from 273 K...
- An ideal heat engine exhausting heat at 77°C is to have a 30% efficiency. It must take heat at
- A gas expands under constant pressure P from volume V_1 to V_2. The work done by the gas is
- When an ideal gas ( =5/3) is heated under constant pressure, then what percentage of given heat energy will be utilised in doing...
- Out of 10 J of radiant energy incident on a surface, the energy absorbed by the surface is 2 J and the energy reflected is 7 J....
- The coefficient of absorption and reflection of the surface of a body are 0.75 and 0.20 respectively. If 200 calorie of radiant...
- If an athermanous body absorbs 20% of the incident radiant energy, then reflection coefficient of the body is
- An ideal black-body at room temperature is thrown into a furnace. It is observed that
- A body of surface are 1.5 10^ -3 m^2 emits 0.3 kcal in 40 second at a temperature 70°C. The emissive power of the surface at that...
- The rate of emission of heat energy per unit area of an iron ball of radius 10 cm is 10 J/m^2 ,s , then rate of emission of heat...