For Boyle’s law to hold good, the gas should be
A bulb contains 1 mole of hydrogen and 1 mole of oxygen at temperature T. The ratio of rms values of velocity of hydrogen molecules to that of oxygen molecule is
An ideal gas is heated from 270 to 6270 C at constant pressure. If initial volume was 4m3,then the final volume of gas will be
Critical temperature can be difined as the temperature
A molecule of mass m of an ideal gas collides with the wall of the vessel with the same velocity. The change in the linear momentum of the molecule will be
Rate of diffusion is
Which one of the following is not a thermodynamical co-ordinate ?
The mean kinetic energy of a molecule of a gas at 300 K is 6.21 x 10-21 The root mean square velocity of a molecule of H2 gas at this temperature will be(R=8.3 J/mole K,N= 6.02 x 1023 /mole, mass of the
hydrogen moleucle = 2 x 1.67 x 10-27 Kg)
At what temperautre will the rms velocity of oxygen moleucle be sufficient, so as to escape from the earth ? Escape velocity from the earth is 11.0 km/s and the mass of 1 moleucle of oxygen 5.34 x 10-26 (Boltzman constant k =1.38 x 10-23 J/K)
The temperature of inside and outside of a refrigerator are 273 K and 303 K respectively. Assuming that the regrigerator cycle is reverisble,for every joule of work done, the heat delivered to the surrounding will be nearly
A sample of gas expands from volume V1 to V2. The amount of work done by the gas is greatest, when the expansion is
During the adiabatic expansion of 2 moles of a gas the internal energy of a gas is found to decrease by 2 J. The work done during the process on gas will be equal to
Magnitude of slope of an adiabatic curve is always
Air is filled in a bottle at atmoshperic pressure and it is cordked at 350C. If the cork can come out at 3 atmospheric pressure then upto what temperature should the bottle be heated in order to remove the cork?
A perfect gas goes from state A to another state B by absorbing 8 x 105 J of heat and doing 6.5 x 105 J of expernal work. It is now transfered between the same two states in another process in which it absorbs 105 J of heat. Then, in the second process
If 150 J of heat is added to a system and the work done by the system is 110 J. Then, change in internal energy will be
An ideal refirgator has a freezer at a temperature of -130C. The coefficient of performance of the engine is 5. The temperature of the air (to which heat is rejected) will be
A Carnot reversible engine converts 1/6 of heat input work. When the temperature of the sink is reduced by 62 K, the efficiency of Carnot’s cycle becomes 1/3. The temperature of the source and sink will be
When a solid is converted into a gas,directly by heating then this process is known as
The latent heat of vapourization of water is 2240 J.If the work done in the process of vapourization of 1 g is 168 J, then increase in internal energy will be
A vessel contains a mixture of 7 g nitrogen and 11 g of carbondioxide at temperature T = 290K. If the pressure of the mixture is 1 atm (1.01 × 105 N/m2). Calculate its density in kg/m3:-
To form a composite 16 μF, 1000V capacitor from a supply of identical capacitors marked 8 μF, 250 V, we require a minimum number of capacitors.
If the height of transmitting and receiving antenna are 32 m and 50 m respectively, then for line of sight (LOS) propagation maximum distance between both antenna is (If radius of earth = 6400 km) (in km) :-
Figure, shows a circuit in which three identical diodes are used. Each diode has forward resistance of 20Ω and infinite backward resistance. Resistors R1 = R2 = R3 = 50 Ω. Battery voltage is 6V. Find the value of current in mA through R3?
Since D3 is reverse biased, there is not current through that branch
A horizontal pipe has a cross section of 10 cm2 in one region and of 5 cm2 in another. The water velocity at the first is 5 ms–1 and the pressure in the second is 2 × 105 Nm–2. Find the pressure of water in 1st region (in N/m2).