This set of Applied Chemistry Multiple Choice Questions & Answers (MCQs) focuses on “Super Conductors”.
1. A solid that offers no _________ passage of electricity is called super conductors.
a) Conductance
b) Inductance
c) Resistance
d) Impedance
View Answer
Explanation: A solid that offers no resistance passage of electricity is called super conductors. They are very good conductors of electricity.
2. The phenomena of super conductors was first discovered by ___________
a) Kammerlingh Onnes
b) Neils bohr
c) Richard Smalley
d) Otto lehman
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Explanation: The phenomena of super conductors were first discovered by Kammerlingh Onnes. Neils bohr given about atomic structure. Richard Smalley discovered the fullerene by laser ablation method. Otto lehman coined the name liquid crystal.
3. Super conductors are discovered in the year _______
a) 1900
b) 1991
c) 1911
d) 1905
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Explanation: Super conductors are discovered in the year 1911 by Kammerlingh Onnes. He is a Dutch physicist. When he was measuring the resistivity of the mercury below 4.2K he found the super conductors.
4. The earliest superconductors to be studied elaborately is ________
a) Niobium alloy
b) Copper alloys
c) Steel alloys
d) Iron alloy
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Explanation: The earliest superconductors to be studied elaborately are niobium alloy. The super conductivity can be understood with the help of quantum physics.
5. The shifting of electrons in super conductors is prevented by _________
a) Quantum effect
b) Threshold energy level
c) Energy barrier
d) Orbitals
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Explanation: The shifting of electrons in super conductors is prevented by quantum energy. Electrons in normal metals shift from one energy level to another.
6. The electrons head in ___________ direction.
a) Same
b) Different
c) Opposite to one another
d) Random
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Explanation: The electrons head in same direction and continue to carry current endlessly. As they are in same direction, they do not collide with each other.
7. The normal metal passes into super conducting state at ___________
a) High temperature
b) Low temperature
c) Critical temperature
d) No temperature
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Explanation: The normal metal passes into super conducting state at critical temperature. Most of the metals act as super conductors at low temperatures.
8. Based on magnetic response super conductors are of __________ types.
a) 1
b) 2
c) 3
d) 4
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Explanation: Based on the magnetic response super conductors are of two types. They are ideal super conductors or hard super conductors.
9. Ideal super conductors completely become __________ at super conducting state.
a) Diamagnetic
b) Ferro magnetic
c) Ferri magnetic
d) Para magnetic
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Explanation: Ideal super conductors become diamagnetic at super conducting state. The permeability is less than that of permeability in Vaccum.
10. The ideal super conductors exhibit __________
a) Meissner effect
b) Mesmeric effect
c) Mesomeric effect
d) Monomeric effect
View Answer
Explanation: The ideal super conductors exhibit meissner effect. The expulsion of magnetic flux from the interior of a piece of super conducting material as the material undergoes transition to super conducting phase.
11. The hard super conductors are those in which the ideal behaviour is seen up to a ________ critical magnetic field.
a) Higher
b) Lower
c) Moderate
d) Zero
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Explanation: The hard super conductors are those in which the ideal behaviour is seen up to a lower critical magnetic field beyond which the magnetization gradually changes and attains zero.
12. This functions as a super conductor at a critical temperature of ________
a) 30oK
b) 60oK
c) 90oK
d) 120oK
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Explanation: This functions as a super conductor at a critical temperature of 900K. Charged particles in solids can travel only in fixed directions or levels.
13. The constituents of this material that is yttrium, barium and copper are in ____________
a) 1:1:1
b) 1:2:2
c) 1:2:3
d) 1:2:1
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Explanation: The constituents of this material that yttrium, barium and copper are in 1:2:3 molar stoichiometric ratios and hence are called as 1:2:3 super conductors.
14. Preparation of super conductors by ceramic method by homogeneous mixture of the oxides __________ in their molar ratios.
a) Y2O3, BaCO3, CuO
b) Y2O3, BaCO3, Cu2O
c) Y2O4, BaCO3, CuO
d) YO3, BaCO3, CuO
View Answer
Explanation: Preparation of super conductors by ceramic method by homogeneous mixture of the oxides Y2O3, BaCO3, CuO in their molar ratios.
15. Annealing the homogeneous mixture to room temperature to retain its __________
a) Composition
b) Structure
c) Its properties
d) Composition, structure and its properties
View Answer
Explanation: Annealing the homogeneous mixture to room temperature to retain its composition, structure and its properties. Heating them to obtain an oxygen deficient super conductors.
Sanfoundry Global Education & Learning Series – Applied Chemistry.
To practice all areas of Applied Chemistry, here is complete set of 1000+ Multiple Choice Questions and Answers.
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