PHYSICS XII HEAT ( @MBR )
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PHYSICS XII HEAT
1.
The change of entropy is given by :
a) Delta S = Delta Q / T
b) Delta S = Delta Q.T
c) Delta S = Delta U / T
d) Delta S = Delta W/ DeltaT
2.
Maximum work can be obtained in the process called :
a) Cyclic process
b) Isochoric process
c) Isothermal process
d) Adiabatic process
3.
The relation between volume and absolute temp. of a given mass of a gas at constant pressure is called :
a) Gas equation
b) None of these
c) Charles law
d) Boyle's law
4.
Heat energy cannot be measured in :
a) Joule
b) B.t.u
c) Kelvin
d) Calorie
5.
Boyle's law holds good for an ideal gas in a process called :
a) Isobaric process
b) Isochoric process
c) Isothermal process
d) Adiabatic process
6.
The Fahrenheit & Celsius scale readings of temperature coincide at :
a) - 460 degree Centigrade
b) 0 degree Centigrade
c) - 273 degree Centigrade
d) - 40 degree Centigrade
7.
No heat flows in to or out of a system, then the process is :
a) Isobaric process
b) Isothermal process
c) Isochoric process
d) Adiabatic process
8.
According to Charles Law :
a) P V = Const.
b) V / T = Const..
c) V T= K
d) P/ V = K
9.
In an adiabatic process, the work is done at the cost of :
a) None of these
b) Internal energy
c) External pressure
d) Mechanical energy
10.
According to the second law of thermodynamics , 100% conversion of heat in to mechanical work is :
a) Possible
b) Not possible
c) Possible, if the conditions are ideal
d) Possible, if the process is adiabatic
11.
A device that converts heat in to mechanical energy is called ;
a) Perpetual machine
b) Thermostat
c) Heat engine
d) Heat reservoir
12.
The temperature of a normal human body is :
a) 37.9 deg. C
b) 96.8 deg. F
c) 98.6 deg. F
d) 27 deg. C
13.
1 calorie is equivalent to :
a) 4180 Joule
b) 4.18 Joule
c) 4.2 ev
d) 42 B.t.u
14.
The pressure in a gas cylinder containing hydrogen will leak more quickly than if it is containing oxygen because :
a) Pressure of hydrogen is high
b) Rate of diffusion of hydrogen is high
c) Rate of diffusion of oxygen is high
d) Brownian motion of hydrogen molecules is faster
15.
For an ideal gas the following is a relation for Boyle's law :
a) P
1
V
1
/ m
1
= P
2
V
2
/ m
2
b) V
1
/ T
1
= V
2
/ T
2
c) P
1
/ V
1
= P
2
/ V
2
d) P
1
/ m
1
V
1
= P
2
/ m
2
V
2
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