Question-1.Let A & B are two sample of ideal gases of equal mole .let T be the temperature of both the gas Let EA and EB are there total energy respectively .Let MA and MB are these respective molecular mass .which of these is true
a,EA > EB
b,EA < EB
d,none of these
EA = 3/2 nRT
EB = 3/2 nRT
Question-2. The velocities of the molecules are v, 2v, 3v, 4v & 5v. The rms speed will be
Vrms= (∑ V2 / N)1/2
= [(V2 + 4V2 + 9V2 + 16V2 + 25V2)/5]1/2
Question-3. What is true of Isothermal Process
a, ΔT >0
In an Isothermal Process
Temperature remains constant ΔT =0
Since Internal energy depends on the temperature
From first law of Thermodynamics
As T is constant
Question-.4 Two absolute scales A and B have triple points of water defined as 200A and 350A. what is the relation between TA and TB
Given that on absolute scale
Triple point of water on scale A = 200 A
Triple point of water on scale B = 350 B
Also, triple point of water on Kelvin scale = 273.16 K
Now temperature on scale A and on scale B is equivalent to 273.16 K on absolute temperature scale.
Thus, value of one degree on absolute scale A = (273.16/200) K
Value of temperature TA on absolute scale A = (273.16XTA)/200
Similarly value of temperature TB on absolute scale B = (273.16XTB)/350
Since TA and TB represent the same temperature
273.16×TA/200 = 273.16×TB/350
Or, TA = 200TB/350 = 4TB/ 7
Question 5: A gas is contained in a cylinder with a moveable piston on which a heavy block is placed. Suppose the region outside the chamber is evacuated and the total mass of the block and the movable piston is 102 kg. When 2140 J of heat flows into the gas, the internal energy of the gas increases by 1580 J. What is the distance s through which the piston rises?
Total heat supplied =Workdone + Change in internal energy
So work done=2140-1580=560 J
Let s be the distance moved then
the workdone is given by =Fs
Class 9 physics notes on chapter motion is now available at the following link CLASS 9 MOTION NOTES (FULL LENGTH)
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