31. The piezoelectric effect is the polarization of a dielectric under the influence of
32. The superconductivity is due to
33. The dielectric strength of gaseous dielectric depends on which of the following factors?
34. Match List-I with List-II and select the correct answer using the options given below:
List-I (Optical devices)
List-II (Electrical/optical characteristics)
a. GaAs
1. Emits monochromatic light of low intensity
b. Solar cell
2. Consumers electrical power due to the incident light
c. Photo Diode
3. Deliver power to a load
d. LED
4. Emits monochromatic light of light intensity
| List-I (Optical devices) | List-II (Electrical/optical characteristics) |
| a. GaAs | 1. Emits monochromatic light of low intensity |
| b. Solar cell | 2. Consumers electrical power due to the incident light |
| c. Photo Diode | 3. Deliver power to a load |
| d. LED | 4. Emits monochromatic light of light intensity |
35. A large value of the exchange interaction energy in a ferromagnetic material implies.
36. The resistance of a metallic wire would
37. Which of the following represent the properties of carbon nanotubes?
1. High electrical conductivity
2. Very high tensile strength
3. High thermal conductivity
4. Low thermal expansion coefficient
Select the correct answer using the options given below:
1. High electrical conductivity
2. Very high tensile strength
3. High thermal conductivity
4. Low thermal expansion coefficient
Select the correct answer using the options given below:
38. Materials which lack permanent magnetic dipoles are known as
39. A 'hole' in a semiconductor has
1. Positive charge equal to the electron charge
2. Positive mass equal to the mass of the electron
3. An 'effective mass' greater than the effective mass of electron
4. Negative mass and positive charge equal to the charge in nucleus
1. Positive charge equal to the electron charge
2. Positive mass equal to the mass of the electron
3. An 'effective mass' greater than the effective mass of electron
4. Negative mass and positive charge equal to the charge in nucleus
40. The magnetic field at which a superconductor remains in its superconducting state at a temperature less than the transition temperature is
Read More Section(Materials and Components)
Each Section contains maximum 100 MCQs question on Materials and Components. To get more questions visit other sections.