41. Which one of the following is a metallic crystal structure which has a cubic unit cell with atoms located at all eight corners and a single atom at the cube centre?
42. Which of the following materials are categories of ceramic materials?
1. Oxides-alumina, Zirconia
2. Non-oxides-Carbides, Borides, Nitrides and Silicides
3. Composites- Particulate reinforced combinations of oxides and non-oxides
Select the correct answer using the options given below:
1. Oxides-alumina, Zirconia
2. Non-oxides-Carbides, Borides, Nitrides and Silicides
3. Composites- Particulate reinforced combinations of oxides and non-oxides
Select the correct answer using the options given below:
43. An intense magnetic field is to be produced by a superconducting coil. Which one of the following is essential?
44. Superconductivity is observed for
45. Consider the following statements regarding the effect of temperature on the dielectric constant of an insulator.
1. The dielectric constant increases due to thermal energy facilitating the alignment of the dipole with the applied field.
2. The dielectric constant decrease due to the randomizing effect of thermal energy.
3. The dielectric constant decreases due to an increase in the volume of the material.
4. The dielectric constant increases due to the creation of new dipoles.
Of these statements
1. The dielectric constant increases due to thermal energy facilitating the alignment of the dipole with the applied field.
2. The dielectric constant decrease due to the randomizing effect of thermal energy.
3. The dielectric constant decreases due to an increase in the volume of the material.
4. The dielectric constant increases due to the creation of new dipoles.
Of these statements
46. Type-I classified superconducting materials on the basis of magnetic response are completely in diamagnetic state where magnetic field is excluded from the body of material due to the phenomenon, known as
47. Which of the following insulating materials has the least affinity for moisture?
48. If the drift velocity of holes under a field gradient of 200 V/m is 100 m/s, their mobility in SI units is
49. Which one of the following is a trivalent material?
50. Which of the following are the properties of poly tetra fluoroethyene?
1. Extreme heat resistant
2. Low resistance to most chemical reagents
3. Excellent insulating properties over a wide range of temperature
4. Non-hygroscopicity
Select the correct answer using the options given below:
1. Extreme heat resistant
2. Low resistance to most chemical reagents
3. Excellent insulating properties over a wide range of temperature
4. Non-hygroscopicity
Select the correct answer using the options given below:
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