1 The property of waves that makes hearing an ideal early warning system in humans is....

a ... dispersion.

b ... diffraction.

c ... dysplasia.

d ... reflection.

2 Huygen's principle is an aid to understanding the properties of ....

a ... light.

b ... sound.

c ... ripples.

d ... all of the above.

3 A diffraction grating has a first order spectrum with more dispersion if....

a ... the slits are longer.

b ... the slits are wider.

c ... the slits are further apart.

d ... the slits are closer together.

4 A double-ring halo seen close to the Sun in a hazy sky could be due to....

a ... diffraction by tiny water droplets or particles like pollen grains.

b ... refraction by ice crystals.

c ... interference in water droplets.

d ... distraction by pollutants.

5 The slow mixing of dye into an undisturbed lake is described as....

a ... diffraction.

b ... diffusion.

c ... convection.

d ... evolution.

6 A clock with numbers from 1-12 and a single hour hand is best described as....

a ... an analog instrument.

b ... a digital instrument.

c ... an unreliable instrument.

d ... an improvised instrument.

7 The dimensions of power are....

a ... MLT^-2

b ... ML²T

c ... ML²T^-2

d ... ML²T^-3

8 Which of the following quantities has no dimensions?

a ... displacement.

b ... time.

c ... refractive index.

d ... angular momentum.

9 A device that allows current to pass in one direction only is called a....

a ... battery.

b ... dilator.

c ... dipole.

d ... diode.

10 The power of convex spectacle lenses with a focal length of 40 cm is....

a ... - 4

b ... - 2.5.

c ... + 2.5.

d ... + 4.

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