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Trac nghiem

Total questions: 15

Worksheet time: 8mins

Name
Class
Date
1.

Which of the following single-domain phase in a LC material has the lowest order parameter:

a)

  1. Isotropic

b)

  1. Chiral smectic

c)

Blue phase

d)

  1. Cholesteric LC

e)

  1. Crystal

2.

Which LC property is proportional to the square of order parameter, which is different from the others:

a)

  1. Dielectric anisotropy

b)

  1. Viscosity anisotropy

c)

  1. Magnetic anisotropy

d)

  1. Elastic constant

e)

Optical anisotropy

3.

Which LC phase can be used for temperature sensors:

a)

  1. Nematic LC

b)

  1. Smectic A

c)

  1. Cholesteric LC

d)

  1. Blue phase

e)

  1. Chiral smectic C

4.

Which LC phase has the spontaneous polarization:

a)

  1. SmA

b)

  1. Chiral smectic C

c)

  1. Blue phase

d)

  1. Cholesteric LC

e)

  1. Nematic

5.

Which anisotropic properties (48, An, and Ax) of LCs are similar in positive (+) and negative (-) signs:

a)

E and n

b)

E and x

c)

n and x

d)

All of them

e)

None of them

6.

Which of the following parameters will affect both relaxation time and threshold voltage of the electro-optical response in LCDs:

a)

  1. Elastic constants of LCs

b)

  1. Viscosity of LCs

c)

  1. E of LCs

d)

  1. Cell thickness

e)

  1. None of them

7.

Which result will increase the threshold voltage of the electro-optical response in LCDs, if the following parameter is changed:

a)

  1. Cell thickness increase

b)

  1. Viscosity of LCs increase

c)

Temp decrease

d)

  1. Dielectric anisotropy E increase

e)

Elastic constants of LCs decrease

8.

Which is true by adding more chiral dopants in the nematic phase:

a)

Pitch increase

b)

Ps decrease

c)

d (cano line width)

d)

Lamda ((Reflecting color wavelength) decrease

e)

Viscosity increase

9.

Which property can be measured by Cano lines of LCs:

a)

  1. Dielectric anisotropy

b)

  1. Viscosity anisotropy

c)

  1. Helical twisting power (HTP)

d)

  1. Elastic constant K

e)

  1. Optical anisotropy

10.

Which kind of deformation will occur in the on-state of IPS cells in LCDs:

a)

  1. Splay and Twist

b)

  1. Twist and Bend

c)

  1. Splay and Bend

d)

  1. Twist only

e)

Bend only

11.

Which phase has the biaxial optical property:

a)

  1. Cholesteric phase

b)

  1. Isotropic liquid

c)

Smectic A phase

d)

Smectic C phase

e)

Nematic phase

12.

  1. Which of the following situations will be in the bright state of LCDs as polarizers are crossed:

a)

  1. Out of electricity in Blue phase mode

b)

  1. Out of electricity in VA mode

c)

  1. Out of electricity in TIN mode

d)

  1. LCs in the isotropic state

e)

  1. Les leak out of cell

13.

  1. Which of the following phase difference is able to transform a linear polarized light to a circular polarized light:

a)

lamda

b)

Pi/2

c)

Lamda/2

d)

45 độ

e)

Pi

14.

Which LCD mode has the fastest response time:

a)

Blue phase

b)

TN

c)

IPS

d)

Ferroelectric

e)

VA

15.

Which of the following phase differences is expected to be used in the on state of VA mode LCDs as the polarizers are crossed:

a)

lamda

b)

pi

c)

lamda/4

d)

90 độ

e)

Pi/4

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