Properties of Matter

Which of the following is NOT a unit of Young's modulus?

• Pascal (Pa)

• Newton per square meter (N/m²)

• Joule per meter (J/m)

• Mega Pascal (MPa)

In a torsional pendulum experiment, the rigidity modulus is determined by measuring:

• Length of the wire

• Angle of twist

• Time period of oscillation

• Mass of the bob

The bending of a beam under load is an example of:

• Shear stress

• Tensile stress

• Compressive stress

• Flexural stress

Which law is used to determine the terminal velocity of a small sphere moving through a viscous liquid?

• Stokes' Law

• Bernoulli's Principle

• Pascal's Law

• Poiseuille's Law

The unit of coefficient of viscosity in the SI system is:

• Pascal second (Pa·s)

• Poise (P)

• Newton per meter squared (N/m²)

• Pascal (Pa)

The Poiseuille's formula is applicable to:

• Flow through a rectangular channel

• Flow through a capillary tube

• Flow over a flat plate

• Flow in a wide-open conduit

The excess pressure inside a soap bubble is:

• Directly proportional to its radius

• Inversely proportional to its radius

• Independent of its radius

• Proportional to the square of its radius

Which of the following is true about surface tension with increasing temperature?

• It increases

• It decreases

• It remains constant

• It first increases, then decreases

The molecular theory of surface tension explains that the surface tension is due to:

• The attraction between molecules in the bulk of the liquid

• The attraction between molecules at the surface and in the bulk

• The repulsion between surface molecules

• The absence of molecular forces

Elasticity: Which of the following statements correctly describes the relation between stress and strain?