Which of the following statements are correct for superconductors 1. A substance loses its electrical resistance below a certain temperature. 2. Superconducting elements have greater electrical resistivity at room temperature. 3. On adding impurities to superconducting elements its transition temperature is increased.?

1, 2 and 3
1 and 2 only
1 and 3 only
2 and 3 only

LohaHridoy

4 views

2025-01-04 04:42

1 Answers

AhmedNazir

Option 2 : 1 and 2 only

On adding impurities to a superconductor, its transition temperature is decreased.

This is observed in the following plot:

[ alt="F1 S.B Madhu 07.05.20 D4" src="//storage.googleapis.com/tb-img/production/20/05/F1_S.B_Madhu_07.05.20_D4.png" style="width: 324px; height: 295px;">

T_C(k): Critical temperature in kelvin on Y-axis.

x: Impurity concentration on X-axis.

Hence, Statement 3 is wrong

Special Note:

Superconductivity: In the state of superconductivity, material exhibit zero resistivity (i.e. it loses its electrical resistance) and perfect diamagnetism. Superconductivity appears at low temperatures. Ex: Hg, Pb, Zn, CuS etc.

Transition temperature: It is a critical temperature at which there is a change of state from normal to superconducting and vice versa.

4 views Answered 2022-09-04 04:29

Related Questions

Which of the following has/have occurred in India after its liberalization of economic policies in 1991 1. Share of agriculture in GDP increased enormously. 2. Share of India's exports in world trade increased. 3. FDI inflows increased. 4. India's foreign exchange reserves increased enormously. Select the correct answer using the codes given below:?

1 Answers 4 Views

Consider the following statements: 1. Metal conductors have more R(resistance) at higher temperatures. 2. Tungsten can be used as a resistance wire. 3. A superconductive material is one that has practically zero resistance. Which of the above statements are correct?

1 Answers 4 Views

Consider the following statements: 1. Type-I superconductors undergo an abrupt transition to the normal state above a critical magnetic field. 2. Type-II superconductors are highly technologically useful superconductors because the incidence of a second critical field in them is useful in the preparation of high field electromagnets. Which of the above statements is/are correct?

1 Answers 4 Views

Each of these Questions given below contains three elements. These elements may or may not have some inter-linkage. Each group of elements may fit into one of these diagrams at (1) , (b), (3) or (d). You have to indicate the group of elements which correctly fits into the diagrams. Which of the following diagrams indicates the best relation between Thief, Criminal and Police?

1 Answers 4 Views

Each of these Questions given below contains three elements. These elements may or may not have some inter-linkage. Each group of elements may fit into one of these diagrams at (1) , (b), (3) or (d). You have to indicate the group of elements which correctly fits into the diagrams. Which of the following diagrams indicates the best relation between Children, Naughty, and Studious?

1 Answers 4 Views

Which of the following statement is correct Statement 1: The addition of hydrogen to a substance and the removal of the oxygen from a substance is called oxidation. Statement 2: The addition of oxygen in a substance and the removal of Hydrogen from a substance is called reduction. ?

1 Answers 4 Views

Consider the following statements: 1. Adding a zero to the G(s)H(s) tends to push root locus to the left. 2. Adding a pole to the G(s)H(s) tends to push root locus to the right. 3. Complementary root locus (CRL) refers to root loci with positive K. 4. Adding a zero to the forward path transfer function reduces the maximum overshoot of the system. Which of the above statements are correct?

1 Answers 4 Views

Consider the following statements: 1. The entropy of a pure crystalline substance at absolute zero temperature is zero. 2. the efficiency of a reversible heat engine is independent of the nature of the working substance and depends only on the temperature of the reservoirs between which it operates. 3. Carnot’s theorem states that of all heat engines operating between a given constant temperature source and a given constant temperature sink, none has a higher efficiency than a reversible engine Which of the above statements are correct?

1 Answers 7 Views

In the following question below are given some statements followed by some conclusions. Taking the given statements to be true even if they seem to be at variance from commonly known facts, read all the conclusions and then decide which of the given conclusions logically follows the given statements. Statements: I. All doors are room. II. No room is a window. Conclusions: I. No door is a window. II. No window is a room.?

1 Answers 4 Views

Consider the following statements: 1. Superconductors exhibit normal conductivity behaviour above a transition temperature Tc 2. Superconductors lose their superconducting nature in an external magnetic field, provided the external magnetic field is above a critical value. 3. High Tc, superconductors have T, values in the range 1 to 10 K. Which of the above statements are correct?

1 Answers 4 Views

এক্সাম দিয়ে মেধা যাচাই করুন

Job Preparation (1125)

Admission (754)

এসএসসি (10)

এইচএসসি (5)