71. Intense magnetic field may be produced in a coil by using a
72. Which of the following are not the production methods for carbon nanotubes?
1. Electric arc discharge method
2. Laser vaporization method
3. Czochralski method
4. Metallization method
Select the correct answer using the options given below:
1. Electric arc discharge method
2. Laser vaporization method
3. Czochralski method
4. Metallization method
Select the correct answer using the options given below:
73. Superconductors are becoming popular for use in
74. Ceramic resonators use which one of the following?
75. Which of the following statements are correct for ceramic materials?
1. They are inorganic substances
2. They are brittle
3. They are good thermal insulators
Select the correct answer using the options given below:
1. They are inorganic substances
2. They are brittle
3. They are good thermal insulators
Select the correct answer using the options given below:
76. A superconductor may be used for generating
77. The difference between the number of atoms in a unit cell of a bcc crystal and an FCC crystal is
78. Ferromagnetic materials show hysteresis in B-H characteristics. As the magnetic field is increases slowly from zero value, what is the first process which sets in the material to give net magnetization?
79. In ruby laser, which of the following is true
80. For a permanent magnetic material
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