Temperature

Q. The value of( =Cp/Cv) , for hydrogen, helium and another ideal diatomic gas X (whose molecules are not rigid but have an additional vibrational mode), are respectively equal to :

Q. An air bubble doubles its radius on raising from the bottom of water reservoir to be the surface of water in it. If the atmospheric pressure is equal to 10 m of water, the height of water in the reservoir is

1. 10 m
2. 20 m
3. 70 m
4. 80 m

Q. Why average kinetic energy( per molecule) of any ideal gas (be it monoatomic, diatomic, polyatomic)is always equal to 3/2KbT.

Q.

The temperature at which the root mean square velocity of a molecule will be doubled than at ${100}^{\circ }C$

1. 1492°C

2. 1219°C

3. 400°C

4. 400 K

Q. The value of △ S for freezing of 10 g of H_2O_{(l) }( enthalpy of fusion is 80 cal/g) at 0^0 C and 1 atm pressure is (1) 12.25 J/K (2) -0.244 J/K (30 -2.93 J/K (4) -12.25 J/K.

Q.

$0.014kg$ of nitrogen is enclosed in a vessel at a temperature of ${27}^{\circ }C$. The amount of heat energy to be supplied to the gas to double the rms speed of its molecules is approximately equal to

1. 6350 J

2. 7350 J

3. 8350 J

4. 9350 J

Q. the s†an dard enthalpy of formation of gaseous H2O at 298K is -241.82KJ/mol. Estimatr its value of 373K given the following values of the molar heat capacities at cons†an t pressure: H2O(g):35.58J/Kmol, H2(g):28.84J/mol K and O2(g):29.37J/mol K. assume heat capacity to be independent of temperature. 1) -272.6Kj/mol 2) -300Kj/mol 3) -242.6Kj/mol 4) -206kj/

Q.

On a large tray of mass M, an ice cube of mass m, edge L is kept. If the ice melts completely, the centre of mass of the system comes down by

1. 

2. 

3. 

4. 

Q. For an ideal gas the fractional change in its volume per degree rise in temperature at constant pressure is equal to (T is absolute temperature of gas)

Q. 20. The mean free path of benzene molecule is6 x 10-6 m and average speed of molecules is1.2 x 103 m/s. The collision rate of molecules, is(1) 3 x 107 s-1(2) 4 x 108 s-1(3) 4 x 107 s-1(4) 2 x 108 s-1

Q. At normal temperature and pressure density of a air is 1.293 kg m^-3 and specific heat at constant volume is 169 cal kg^-1 K^-1 find the value of specific heat at constant pressure

Q. The factor on which the average kinetic energy of a gas depends is

1. nature of gas
2. volume
3. temperature
4. all of these

Q. Estimate the average thermal energy of a helium atom at (i) room temperature (27 °C), (ii) the temperature on the surface of the Sun (6000 K), (iii) the temperature of 10 million kelvin (the typical core temperature in the case of a star).

Q. 54. In the melting of ice which one of the conditions will be more favorable about temperature and pressure

Q. a bullet of mass 1gm moving with a speed of 20 m/s hits an ice block of mass 990 gm kept on a frictionles floor and gets struck in it the amount of ice that melts if 50% of the lost kinetic energy goes to ice will b

Q. why is it so that if volume remains constant then work done is taken zero?

Q. 48. A body cools down from 45degree celsius to 40 degree celsius in 5 min . and to 35degree celsius in another 8 min . Find the temperature of surrounding

Q. Temperature is a measurement of coldness or hotness of an object which law state this statement

Q. The mean free path of benzene molecule is 6×10^-6 m and the average speed of molecules is 1.2×10^3 m/s. The collision rate of molecules is

Q. When a gas cylinder is kept on an accelerating van then its temperature will

1. increase
2. decrease
3. remain constant
4. first increase then decrease

Q.

The internal energy of an ideal gas depends on:

1. Pressure

2. Volume

3. Temperature

4. Type of gas

Q. 1g H2 gas expands at STP to occupy double of its original volume the work done during process is

Q.

(Molar specific heat capacity at constant pressure) - (Molar specific heat capacity at constant volume) is equal to

1. R

2. k_B

3. R/2

4. nR, where n is number of moles

Q.

The temperature at which the root mean square velocity of a molecule will be doubled than at ${100}^{\circ }C$

1. ${1219}^{\circ }C$

2. ${1492}^{\circ }C$

3. ${400}^{\circ }C$

4. 400 K

Q.

Consider a jar of gas kept on a car. The temperature of the gas is ${50}^{\circ }$ C. After sometime, the car starts moving at a constant velocity of magnitude 10 m/s. Since $v_{rms}$ with respect to the ground changes, what will be the temperature in the ground frame?

1. 

2. 

3. 

4. 

Q. The average translational k.5 of air molecules is 0.040 ev $1ev=1.6\times {10}^{-19}J$. Calculate the temperature of the air.

1. 200 k
2. 400 k
3. 310 k
4. 420 k

Q.

Charles's Law is about the relationship between _______ in flexible containers.

1. temperature and volume

2. pressure, volume and temperature

3. temperature and pressure

4. pressure and volume

Q. The factor on which the average kinetic energy of a gas depends is

1. nature of gas
2. volume
3. temperature
4. all of these

Q. The dimensional formula for molar thermal capacity is same as that of

Q. based on kinetic theory of gases, calculate the pressure of a gas enclosed in a cylinder in terms of mean translational kinetic energy of the gas per unit volume of the gas.