Q141
Open questionWhich 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?
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Materials And Components
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Q142
Open questionWhich 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:
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Q143
Open questionAn intense magnetic field is to be produced by a superconducting coil. Which one of the following is essential?
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Q144
Open questionSuperconductivity is observed for
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Q145
Open questionConsider 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
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Q146
Open questionType-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
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Q147
Open questionWhich of the following insulating materials has the least affinity for moisture?
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Q148
Open questionIf the drift velocity of holes under a field gradient of 200 V/m is 100 m/s, their mobility in SI units is
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Q149
Open questionWhich one of the following is a trivalent material?
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Q150
Open questionWhich 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
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Q151
Open questionConsider the following statements with regard to FCC structure:
1. Number of nearest neighbour atoms is twelve.
2. Packing efficiency is 0.74.
3. There is an atom at the body centre of the unit cell.
Which of the statements given above is/are correct?
1. Number of nearest neighbour atoms is twelve.
2. Packing efficiency is 0.74.
3. There is an atom at the body centre of the unit cell.
Which of the statements given above is/are correct?
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Q152
Open questionPure Metals generally have
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Q153
Open questionElectrical conductivity, thermal conductivity and magnetic properties of ceramic material are
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Q154
Open questionForbidden gap in a semiconductor is
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Q155
Open questionWhich one of the following does not come under the category of ceramic material?
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Q156
Open questionPolyethylene is produced by
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Q157
Open questionWhat are the materials which exhibit electric polarization even in the absence of an applied electric field called?
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Q158
Open questionThe structure sensitive property of a superconductor is
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Q159
Open questionA hetero-structure laser is better than a diode laser (injection laser) because of its
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Q160
Open questionMatch List-I with List-II and select the correct answer using the options given below:
(Here T is temperature of the material in Kelvin. θ is a constant for a material).
| List-I (Material) | List-II (Properties) |
| a. Superconductor at very low temperature | 1. High frequency |
| b. Fabric chloride | 2. Very small -ve susceptibility |
| c. Diamond | 3. Very high -ve susceptibility |
| d. Manganese oxide | 4. Susceptibility is inversely proportional to +θ |
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