Materials And Components MCQs with Answers 2027

Q121

A vacuum parallel plate capacitor is charged. The field between the plates is 2 × 10⁴ V/m. If the space between the plates is filled with a material of relative dielectric constant of 10.0, then the value of the field in the dielectric will be

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Q122

Open question

Magnetic field of Earth has no vertical component at

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Q123

Open question

Material in superconducting state have the property of

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Q124

Open question

The crystal in which atoms are chemically highly inactive and they do not form compounds with other atoms is

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Q125

Open question

Resistivity of iron and nickel is of the order of

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Q126

Open question

The temperature at which a material becomes a glassy solid is called

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Q127

Open question

Elements can reach a stable atomic structure by

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Q128

Open question

The first critical condition at which free electrons are diffracted in an FCC crystal would occur at which one of the following values of the wave number 'k'? ('a' is lattice parameter)

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Q129

Open question

Match List-I with List-II and select the correct answer using the options given below:

List-I	List-II
a. Ferrite	1. Meissner effect
b. Superconductor	2. Faraday effect
c. Quartz	3. Low sensitivity and high stability
d. Iron	4. Piezoelectricity

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Q130

Open question

Which of the following is the Fermi function f(E)?

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Q131

Open question

Which of the following is not a permanent magnetic material?

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Q132

Open question

A rolled-paper capacitor of value 0.02 µF is to be constructed using two strips of aluminium of width 6 cm, and, wax impregnated paper of thickness 0.06 mm whose relative permittivity is 3. The length of foil strips should be:

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Q133

Open question

A small amount of phosphorus is added to silicon so that there are 2.5 × 10¹⁷ conduction electrons per cubic meter and 9.0 × 10¹⁴ holes per cubic meter. Let µ_e = 0.13 m²/V.s and µ_h = 0.05 m²/V.s. The resistivity in Ω - m will be

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Q134

Open question

Consider the following statements regarding corrosion of ceramic material:
1. Ceramic materials are much better suited to withstand most of these environments for reasonable time periods than are metals.
2. Corrosion of ceramic materials generally involves simple chemical dissolution, in contrast to the electrochemical processes found in metals.
3. Ceramic materials are not frequently used because of their non-resistance to corrosion.
Which of the above statements is/are correct?

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Q135

Open question

Silicon is not suitable for fabrication of light emitting diodes because it is

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Q136

Open question

The capacitance per unit volume is maximum for

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Q137

Open question

Which one of the following statement is correct forbidden gap for four-point probe method of determining resistivity?

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Q138

Open question

The dc resistivity and permeability exhibited by a type 1 superconductor are respectively:

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Q139

Open question

Consider the following
1. Cheaper method
2. Low residual oxygen content in the grown crystal is possible
3. Uniform doping is possible
4. Larger diameter crystals can be grown
Which of the above are the advantages of the float zone (FZ) method over the Czochralski (CZ) method in single crystal growth of silicon?

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Q140

Open question

The atomic packing factor (APF) is equal to

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Materials And Componentspractice.

Materials And Components
practice.