According to Newton's corpuscular theory, the speed of light is
same in all the media
lesser in rarer medium
lesser in denser medium
independent of the medium
Which of the following is not a thermodynamic coordinate ?
Gas constant (R)
Pressure (p)
Volume (V)
Temperature (T)
Two solid pieces, one of steel and the other of aluminium when immersed completely in water have equal weights. When the solid pieces are weighed in air
the weight of aluminium is half the weight of steel
steel piece will weigh more
they have the same weight
aluminium piece will weigh more
A.
the weight of aluminium is half the weight of steel
In air, force of gravity acts on metals. Thus, these have their actual weight. Atomic weight of steel, ie, iron is 56 and that of aluminium is 27. Hence, it can be said that in air the weight of aluminium is half the weight of steel.
The colloidal solution in which both the dispersed phase and dispersion medium are liquids are called
emulsions
gels
foams
liquid crystals
0.1 m3 of water at 80°C is mixed with 0.3 m3 of water at 60°C. The final temperature of the mixture is
65°C
70°C
60°C
75°C
A graph of pressure versus volume for an ideal gas for different processes is as shown. In the graph curve OC represents
isochoric process
isothermal process
isobaric process
adiabatic process
Which of the following statement does not hold good for thermal radiation ?
The wavelength changes when it travels from one medium to another
The frequency changes when it travels from one medium to another
The speed changes when it travels from one medium to another
They travel in straight line in a given medium
The amount of heat energy radiated by a metal at temperature T is E. When the temperature is increased to 3T, energy radiated is
81E
9E
3E
27E
A stationary point source of sound emits sound uniformly in all directions in a non-absorbing medium. Two points P and Q are at a distance of 4 m and 9 m respectively from the source. The ratio of amplitudes of the waves at P and Q is