Consider the following statements:

I. Young's modulus of elasticity is defined as the ratio of normal stress to the longitudinal strain within the elastic limit.

II. Bulk modulus of elasticity is defined as the ratio of normal stress to the volumetric strain, within the elastic limit.

Which of the statement(s) given above is/are correct?

Consider the following statements and select the correct code:

I. For a given stress, the strain produced in glass is much less than that in rubber.

II. In plastic materials, the force of cohesion are very small.

III. Elastic limit is the smallest stress, which results in permanent distortion.

Which of the statement(s) given above is/are correct?

Consider the following statements:

I. Quartz and phospher bronze are the examples of nearly perfectly elastic bodies.

II. Putty, mud and paraffin wax are the examples of perfectly plastic bodies.

Which of the statement(s) given above is/are correct?

Consider the following statements:

I. The viscosity of a gas increases with rise in temperature.

II. The viscosity of the liquid falls very rapidly with rise in temperature.

Which of the statement(s) given above is/are correct?

Consider the following statements:

I. The coefficient of viscosity is the only parameter through which the viscosity of the fluid is measured.

II. Negative sign of coefficient of viscosity indicates that the viscous force opposes the relative motion.

III. The SI unit of viscosity is $\mathrm{N}-{\mathrm{sm}}^{-2}$.

IV. $1$ poise $=0.1 \mathrm{N}-{\mathrm{sm}}^{-2}$.

Which of the statements given above are correct?

Materials for rain-proof coats and tents owe their water-proof properties to _____.