Polarization MCQs

Question 1

Polaroid sunglasses are useful for drivers because:

Accepted Answer

they cut glare from wet roads and car bonnets

Answer

they magnify signs

Answer

they make everything brighter

Answer

they block all light

Question 2

Bees and some birds use polarized skylight to:

Accepted Answer

navigate

Answer

keep warm

Answer

see colours

Answer

hear better

Question 3

By Malus's law, the transmitted intensity is zero when theta is:

Accepted Answer

90^circ

Answer

45^circ

Answer

0^circ

Answer

180^circ

Question 4

A polarizing filter lets a photographer see fish under water because it:

Accepted Answer

removes the glare reflected from the water surface

Answer

makes water transparent

Answer

colours the water

Answer

magnifies the fish

Question 5

Plane-polarized light of intensity 40 W/m^2 falls on a polarizing filter whose axis is at 30^circ to the plane of polarization. The transmitted intensity is:

Accepted Answer

30 W/m^2

Answer

15 W/m^2

Answer

60 W/m^2

Answer

300 W/m^2

Question 6

Malus's law is:

Accepted Answer

I = I0cos^2theta

Answer

I = I0sin^2theta

Answer

I = I0costheta

Question 7

In stress analysis, closely spaced coloured fringes indicate regions of:

Accepted Answer

high stress

Answer

low stress

Answer

no stress

Answer

high temperature

Question 8

Stress analysis with polaroids works because stressed transparent materials:

Accepted Answer

change the polarization of light passing through them

Answer

become magnetic

Answer

emit their own light

Answer

become opaque

Question 9

A rope vibrating up and down passes through a vertical slit. If the slit is turned horizontal:

Accepted Answer

the wave is blocked

Answer

the wave speeds up

Answer

the wave passes more easily

Answer

nothing changes

Question 10

Microwaves from a transmitter are found to be blocked when a metal grille is rotated. This shows microwaves are:

Accepted Answer

polarized transverse waves

Answer

longitudinal waves

Answer

sound waves

Answer

particles

Question 11

The fact that light can be polarized shows that light is:

Accepted Answer

a transverse wave

Answer

a stream of particles only

Answer

a longitudinal wave

Answer

a sound wave

Question 12

Two crossed polarizers block all light. A third filter placed between them at 45^circ causes:

Accepted Answer

some light to pass through

Answer

no change

Answer

all light to pass

Answer

even less light

Question 13

Plane-polarized light of intensity 80 W/m^2 passes through two filters. The first is at 30^circ to the light's plane and the second at 30^circ to the first. The final intensity is:

Accepted Answer

45 W/m^2

Answer

60 W/m^2

Answer

47 W/m^2

Answer

20 W/m^2

Question 14

If you look at an LCD screen through Polaroid sunglasses and tilt your head, the screen may:

Accepted Answer

go dark

Answer

show a different picture

Answer

change size

Answer

get brighter forever

Question 15

Photoelastic stress analysis can be applied to:

Accepted Answer

plastic models of structures such as dams or bones

Answer

gases

Answer

metal parts directly

Answer

liquids only

Question 16

Plane-polarized light of intensity 80 W/m^2 falls on a polarizing filter whose axis is at 45^circ to the plane of polarization. The transmitted intensity is:

Accepted Answer

40 W/m^2

Answer

80 W/m^2

Answer

20 W/m^2

Answer

400 W/m^2

Question 17

A TV aerial must be aligned with the transmitter's polarization because:

Accepted Answer

radio waves from the transmitter are polarized

Answer

radio waves are longitudinal

Answer

it improves the speed

Answer

it reduces the frequency

Question 18

Plane-polarized light of intensity 100 W/m^2 falls on a polarizing filter whose axis is at 60^circ to the plane of polarization. The transmitted intensity is:

Accepted Answer

25 W/m^2

Answer

50 W/m^2

Answer

250 W/m^2

Answer

12.5 W/m^2

Question 19

Plane-polarized light of intensity 300 W/m^2 falls on a polarizing filter whose axis is at 75^circ to the plane of polarization. The transmitted intensity is:

Accepted Answer

20.1 W/m^2

Answer

40.2 W/m^2

Answer

201 W/m^2

Answer

10 W/m^2

Question 20

Plane-polarized light of intensity 80 W/m^2 is reduced to 60 W/m^2 by a polarizer. The angle between the polarization plane and the polarizer's axis is:

Accepted Answer

30^circ

Answer

15^circ

Answer

41.4^circ

Answer

60^circ

Polarization MCQs — Physics (page 2)

26. Polaroid sunglasses are useful for drivers because:

27. Bees and some birds use polarized skylight to:

28. By Malus's law, the transmitted intensity is zero when theta is:

29. A polarizing filter lets a photographer see fish under water because it:

30. Plane-polarized light of intensity 40 W/m^2 falls on a polarizing filter whose axis is at 30^circ to the plane of polarization. The transmitted intensity is:

31. Malus's law is:

32. In stress analysis, closely spaced coloured fringes indicate regions of:

33. Stress analysis with polaroids works because stressed transparent materials:

34. A rope vibrating up and down passes through a vertical slit. If the slit is turned horizontal:

35. Microwaves from a transmitter are found to be blocked when a metal grille is rotated. This shows microwaves are:

36. The fact that light can be polarized shows that light is:

37. Two crossed polarizers block all light. A third filter placed between them at 45^circ causes:

38. Plane-polarized light of intensity 80 W/m^2 passes through two filters. The first is at 30^circ to the light's plane and the second at 30^circ to the first. The final intensity is:

39. If you look at an LCD screen through Polaroid sunglasses and tilt your head, the screen may:

40. Photoelastic stress analysis can be applied to:

41. Plane-polarized light of intensity 80 W/m^2 falls on a polarizing filter whose axis is at 45^circ to the plane of polarization. The transmitted intensity is:

42. A TV aerial must be aligned with the transmitter's polarization because:

43. Plane-polarized light of intensity 100 W/m^2 falls on a polarizing filter whose axis is at 60^circ to the plane of polarization. The transmitted intensity is:

44. Plane-polarized light of intensity 300 W/m^2 falls on a polarizing filter whose axis is at 75^circ to the plane of polarization. The transmitted intensity is:

45. Plane-polarized light of intensity 80 W/m^2 is reduced to 60 W/m^2 by a polarizer. The angle between the polarization plane and the polarizer's axis is:

More Physics chapters