MCQs of Superconductivity (Physics Group - I - 3110011)

Physics Group - I (3110011) MCQs

MCQs of Superconductivity

Showing 31 to 39 out of 39 Questions

31.

Superconductors are used for

(a)	Very fast and accurate computer can be generated that consumes low power.
(b)	To generate very strong electric fields
(c)	To transmit electrical power over very large distances with substantial power loss or voltage drop.
(d)	Ore separation cannot be done efficiently.

32.

A small size relay or switch made of superconductors.

(a)	Maglev
(b)	Cryotron
(c)	Cryogenic propulsion
(d)	Supercomputers

33.

The following is the first London equation

(a)	$\frac{d J_{s}}{d x} = \frac{n_{s} q^{2} E}{m}$
(b)	$\frac{d J_{s}}{} = \frac{n_{s} q^{2} E}{m} d E$
(c)	$\frac{d J_{s}}{d t} = \frac{n_{s} E}{m}$
(d)	$\frac{d J_{s}}{d t} = \frac{n_{s} q^{2} E}{m}$

34.

The following is the second London equation

(a)	$\frac{m}{n_{s} q^{2}} (\nabla \times J_{s}) + B = 0$
(b)	$\frac{m c}{n_{s} q^{2}} (\partial \times J_{s}) + B = 0$
(c)	$\frac{m}{n_{s} q^{2}} (\partial \times J_{s}) = B$
(d)	$\frac{m c}{n_{s} q^{2}} (\partial \times J_{s}) + B = \infty$

35.

The penetration depth is the __________ where the current drops to 1/e times of its value at the surface.

(a)	height
(b)	point on surface
(c)	length
(d)	depth

36.

For mercury of mass number 202,

T_{c}

is 4.2 K. Find the transition temperature for its isotope of mass number 200.

(a)	4.4010 K
(b)	4.2209 K
(c)	3.9791 K
(d)	4.1035 K

37.

The critical temperature for a metal with isotopic mass 199.5 is 4.185 K. Calculate the isotopic mass if the critical temperature falls to 4.133 K

(a)	205.44
(b)	200.22
(c)	201.98
(d)	204.55

38.

A superconductor tin has a critical temperature of 3.7 K in zero magnetic field and a critical field of 0.0306 T at 0 K. Find the critical field at 2 K.

(a)	5.1111 T
(b)	0.0216 T
(c)	1.1055 T
(d)	0.0299 T

39.

Calculate the critical current through a long thin superconducting wire of radius 0.5 mm. The critical magnetic field is 7.2 kA/m

(a)	22.608 A
(b)	11.61 A
(c)	44.602 A
(d)	22.608 mA

Showing 31 to 39 out of 39 Questions