Physics questions
20027 published questions with worked solutions.
- A body radiate energy 5 W at a temperature of 127℃. If the temperature is increased to 927℃, then it radiates energy at the rate...
- The dimension of Stefan's constant are [MH-CET 2015]
- Certain quantity of water cools from 70℃ to 60℃ in the first 5 minutes and to 54℃ in the next 5 minutes. The temperature of the...
- At what temperature will the R.M.S. velocity for H_2 molecule is same as that for O_2 molecule at 127℃?
- Rate of cooling of body is 0.5℃/min, when the system is 50℃ above the surroundings. When a system is 30℃ above the surroundings,...
- According to Newton's law of cooling, the rate of cooling of a body is proportional to ( )^n, where is the difference of the...
- An ideal Carnot engine takes heat form a source at 317℃, does some external work and delivers the remaining energy to a heat sink...
- The amount of heat energy required to raise the temperature of 1 g of Helium at N.T.P., from T_1 K to T_2 K is [NEET 2013]
- Two metallic spheres S_1 and S_2 are made of the same material and have identical surface finish. The mass of S_1 is three times...
- A solid cube and a solid sphere of the same material have equal surface area. Both are at the same temperature 120℃, then [MP PET...
- A bucket full of hot water cools from 75 ℃ to 70 ℃ in time T_1, from 70 ℃ to 65 ℃ in time T_2 and from 65 ℃ to 60 ℃ in time T_3,...
- A Carnot engine operating between temperatures T_1 and T_2 has efficiency 1/6. When T_2 is lowered by 62 K, its efficiency...
- A carnot engine having an efficiency of = 1/10 as heat engine is used as a refrigerator. If the work done on the system is 10 J,...
- A liquid cools from 70 ℃ to 60 ℃ in 5 minutes. If the temperature of the surrounding is constant at 30℃, then the time taken by...
- When an ideal monoatomic gas is heated at constant pressure, fraction of heat energy supplied which increases the internal energy...
- The work of 146 kJ is performed in order to compress one kilo mole of a gas adiabatically and in this process the temperature of...
- A thermally insulated vessel contains an ideal gas of molecular mass M and ratio of specific heats . It is moving with speed v...
- A perfect gas goes from state A to another state B by absorbing 8 10^5 J of heat and doing 6.5 10^5 J of external work. It is now...
- A diatomic ideal gas is used in a Carnot engine as the working substance. If during the adiabatic expansion part of the cycle,...
- A monoatomic gas at a pressure P, having a volume V expands isothermally to a volume 2 V and then adiabatically to a volumes 16...