The compressibility of water is 6x 10² N^-1m². If one litre is subjected to a pressure of 4 x10⁷ Nm^-2, the decrease in its volume is

• 2.4 cc

• 10 cc

• 24 cc

• 15 cc

Bernoulli's principle is not involved in the working/explanation of

• movement of spinning ball

• carburettes of automobile

• blades of a kitchen mixer

• heart attack

Which one of the following statements is correct? In the case of

• shearing stress there is change in volume

• tensile stress there is no change in volume

• shearing stress there is no change in shape

• hydraulic stress there is no change in volume

24.

The onset of turbulence in a liquid is determined by

• Pascal's law

• Magnus effect

• Reynold's number

• Bernoulli's principle

The temperature at which oxygen molecules have the same root mean square speed as that of hydrogen molecules at 300 K is

• 600 K

• 2400 K

• 4800 K

• 300 K

Mean free path of a gas molecule is

• inversely proportional to number of molecules per unit volume

• inversely proportional to diameter of the molecule

• directly proportional to the square root of the absolute temperature

• directly proportional to the molecular mass

A refrigerator with coefficient of performance $\frac{1}{3}$ releases 200 J of heat to a hot reservoir. Then the work done on the working substance is

• $\frac{100}{3} \mathrm{J}$

• 100 J

• $\frac{200}{3} \mathrm{J}$

• 150 J

The heat capacity per mole of water is (R is universal gas constant)

• 9 R

• $\frac{9}{2} \mathrm{R}$

• 6 R

• 5 R

If the frequency of human heart beat is 1.25 Hz, the number of heart beats in 1 min is

• 80

• 65

• 90

• 75

A particle oscillating under a force $\overrightarrow{\mathrm{F}} - -\mathrm{k}\overrightarrow{\mathrm{x}} - \mathrm{b}\overrightarrow{\mathrm{v}}$ is a (k and b are constants)

• simple harmonic oscillator

• non linear oscillator

• damped oscillator

• forced oscillator