11.

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

The colloidal solution in which both the dispersed phase and dispersion medium are liquids are called

• emulsions

• gels

• foams

• liquid crystals

Sound waves transfer

• only energy not momentum

• energy

• momentum

• Both (a) and (b)

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

• $\frac{3}{2}$

• $\frac{4}{9}$

• $\frac{2}{3}$

• $\frac{9}{4}$