Materials And Components — Part 2 MCQs with Explanations

Remains the same is the correct answer to “As the atoms of rare gases become larger, electronic polarizability”. This question is standard in competitive examination syllabi for Materials And Components.

Normal to both current and magnetic field is the correct answer to “Hall effect is observed in a specimen (metal or semi conductor) when it is carrying current and is placed in a magnetic field. The resultant electric field inside the specimen is”. This question is standard in competitive examination syllabi for Materials And Components.

AC is the correct answer to “The phenomenon of dielectric hysteresis occurs with”. This question is standard in competitive examination syllabi for Materials And Components.

True is the correct answer to “When a dielectric material is subjected to alternating field, the absorption of energy by the material from the field is given by the imaginary part of polarizability.”. This question is standard in competitive examination syllabi for Materials And Components.

A is the correct answer to “The unit for mmf is”. This question is standard in competitive examination syllabi for Materials And Components.

The superconducting property may be destroyed is the correct answer to “When a material is in superconducting state and a magnetic field is applied”. This question is standard in competitive examination syllabi for Materials And Components.

Logarithmic ratio of outer and inner diameter and inversely as the square root of dielectric constant is the correct answer to “The characteristic impedance of coaxial cable depends on”. This question is standard in competitive examination syllabi for Materials And Components.

1 and 2 is the correct answer to “Consider the following statements relating to piezoelectric materials and their effects: 1. Stress applied to the material produces electric polarization 2. An electric field applied to the material produces strain in it 3. All piezoelectric material are also ferroelectric materials Which of the statements given above are correct”. This question is standard in competitive examination syllabi for Materials And Components.

Fractographic is the correct answer to “The detailed information regarding the mechanism of fracture is available from microscopic examination, normally using scanning electron microscopy, and its study is termed as”. This question is standard in competitive examination syllabi for Materials And Components.

Both electrons and holes carry current is the correct answer to “In an intrinsic semiconductor-”. This question is standard in competitive examination syllabi for Materials And Components.

Electrons is the correct answer to “Around the nucleus are orbiting . . . . . . . . that are negative particles.”. This question is standard in competitive examination syllabi for Materials And Components.

Fused silica is the correct answer to “Which one of the following ceramic composite has high melting temperature”. This question is standard in competitive examination syllabi for Materials And Components.

Temperature and applied magnetic field is the correct answer to “On which of the following factors does the value of critical current density in a superconductor depend”. This question is standard in competitive examination syllabi for Materials And Components.

Vacuum, Air, Glass, TaO2 is the correct answer to “The correct sequence of the following in the increasing order of the values of permittivity is”. This question is standard in competitive examination syllabi for Materials And Components.

Paper capacitor is the correct answer to “Which type of the capacitor should be used in a 1000 V power supply”. This question is standard in competitive examination syllabi for Materials And Components.

-1 is the correct answer to “What is the magnetic susceptibility $$\chi $$ of an ideal superconductor”. This question is standard in competitive examination syllabi for Materials And Components.

critical temperature is the correct answer to “A very low temperature, where resistivity of certain materials abruptly plunges from a finite value to one that is virtually zero and remains there upon further cooling, is called”. This question is standard in competitive examination syllabi for Materials And Components.

parallel planes is the correct answer to “The miller indices are the same for”. This question is standard in competitive examination syllabi for Materials And Components.

a-1, b-2, c-3 is the correct answer to “Match List-I with List-II and select the correct answer using the options given below: List-I List-II a. No eddy current loss 1. Ferrimagnetic material b. Small hysteresis 2. Soft magnetic material c. Large hysteresis 3. Hard magnetic material 4. Nonferrous material”. This question is standard in competitive examination syllabi for Materials And Components.

resistivity of Ni will increase at all temperatures as Cu destroys the periodicity of Ni and acts as defects is the correct answer to “If a small amount of Cu is added to a Ni conductor, then the”. This question is standard in competitive examination syllabi for Materials And Components.

39000 A/m is the correct answer to “Given a ferrite material that we shall specify to be operating in a linear mode with B = 0.05 T, let us assume µ r = 50, and calculate the approximate value for magnetization M.”. This question is standard in competitive examination syllabi for Materials And Components.

Henery/meter is the correct answer to “Unit of permeability is-”. This question is standard in competitive examination syllabi for Materials And Components.

4.12°K is the correct answer to “The transition temperature of Mercury at which it becomes superconductive is”. This question is standard in competitive examination syllabi for Materials And Components.

1 only is the correct answer to “Consider the following statements in connection with superconductors: 1. Transition temperature of a superconductor can be reduced by the application of magnetic field. 2. Transition from the superconducting to normal state under the influence of a magnetic field is irreversible. Which of the statements given above is/are correct”. This question is standard in competitive examination syllabi for Materials And Components.

2, 3 and 4 only is the correct answer to “A Type-I superconductor is 1. A conductor of infinite conductivity at all temperature. 2. A conductor with very large conductivity below a critical temperature. 3. A material showing susceptibility = -1 drastically reduced by a critical temperature. 4. A perfect conductor having conductivity drastically reduced by a critical current. Which of these statements are correct”. This question is standard in competitive examination syllabi for Materials And Components.

Meissner effect is the correct answer to “In the superconducting state, the flux lines of a magnetic field are ejected out of the superconductor as per”. This question is standard in competitive examination syllabi for Materials And Components.

The Cations are positively charged, because they have given up their valence electrons to anions which are negatively charged is the correct answer to “The crystal structure of some Ceramic materials may be thought of being composed of electrically charged Cations and Anions, instead of Atoms, and as such”. This question is standard in competitive examination syllabi for Materials And Components.

$${\text{C}} = \frac{{{{\text{C}}_1}{{\text{C}}_2}}}{{{{\text{C}}_1} + {{\text{C}}_2}}}$$ is the correct answer to “Two ceramic capacitors have the following parameters. One has capacitance C 1 and ceramic thickness d 1 . The other has capacitance C 2 and ceramic thickness d 2 . When the two are connected in series, the combination has a capacitance of:”. This question is standard in competitive examination syllabi for Materials And Components.

1, 2, 3 and 4 is the correct answer to “Superconducting materials are used in which of the following application? 1. Magnetic Resonance Imaging (MRI). 2. Magnetic Resonance Spectroscopy (MRS). 3. High-speed switching and signal transmission for computers. 4. High-speed magnetically levitated trains. Select the correct answer using the options given below:”. This question is standard in competitive examination syllabi for Materials And Components.

1, 2 and 3 is the correct answer to “Consider the following statements for superconductivity: 1. Superconducting magnets capable of generating high fields with low power consumption are currently being employed in scientific test and research equipment. 2. One of the potential applications of superconducting materials is electrical power transmission through superconducting materials- power losses would be extremely low, and the equipment would operate at low voltage levels. 3. Type II superconductors are preferred over type I for most practical applications by virtue of their higher critical temperatures and critical magnetic fields. Which of the above statements is/are correct”. This question is standard in competitive examination syllabi for Materials And Components.

All of the above is the correct answer to “Hall effect may be used for which of the following”. This question is standard in competitive examination syllabi for Materials And Components.

Both 1 and 2 is the correct answer to “Consider the following statements regarding ceramic resonator circuits: 1. The specify larger load capacitance values than crystal circuits 2. They draw still more current than crystal circuit using the same amplifier Which of the above statements is/are correct”. This question is standard in competitive examination syllabi for Materials And Components.

2 is the correct answer to “If a material contains 10 20 molecules/m 3 , each molecule having a moment of 8.854 × 10 -27 C-m parallel to an electric field of 10 5 /m, then its dielectric constant is”. This question is standard in competitive examination syllabi for Materials And Components.

face centered cubic & hexagonal close packed is the correct answer to “Which of the following pairs of crystal structure possesses the same atomic packing density”. This question is standard in competitive examination syllabi for Materials And Components.

The carrier concentration increases is the correct answer to “The electrical conductivity of a semiconductor increases with increase in temperature because”. This question is standard in competitive examination syllabi for Materials And Components.

Increases is the correct answer to “As temperature falls below the transition temperature, the value of critical magnetic field of superconductor”. This question is standard in competitive examination syllabi for Materials And Components.

1 and 3 only is the correct answer to “Which of the following statements are correct for superconductors? 1. A substance loses its electrical resistance below certain temperature. 2. Superconducting elements have greater electrical resistivity at room temperature. 3. On adding impurities to super conducting elements its transition temperature is increased.”. This question is standard in competitive examination syllabi for Materials And Components.

Mu-metal magnetic is the correct answer to “In scintillation coating applications, shields of which material are generally placed around the photomultiplier tube to overcome interference effects of electrons deflected from their normal path”. This question is standard in competitive examination syllabi for Materials And Components.

Clay is the correct answer to “In a variable type carbon resistor the carbon track is formed of a mixture of a carbon, resin and”. This question is standard in competitive examination syllabi for Materials And Components.

1 and 2 is the correct answer to “Consider the following statement : Extrinsic semiconductors show high electrical conductivity because the impurities are 1. of high conductivity 2. highly mobile 3. highly charged Which of these statements are NOT correct”. This question is standard in competitive examination syllabi for Materials And Components.