MCQ
The temperature bellow which a material becomes a superconductor is called:
- ACritical temperature.
- BAbsolute temperature.
- CTripple point.
- DNone of the above.
✓
Answer
- Critical temperature.
Explanation:
Critical temperature is the temperature below which metals when taken exhibit zero resistivity and turns into a superconductor. The critical temperature varies with the individual material. Because these materials have no electrical resistance, meaning electrons can travel freely through them, they can carry large amounts of electrical current for long periods of time without losing energy as heat. The transition is so sudden and complete that it appears to be a transition to a different phase of matter; known as the superconducting phase.
Need a full question paper?
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
Explore more
Similar questions
A coil having an inductance of 0.5 H carries a current which is uniformly varying from zero to 10 ampere in 2 second. The e.m.f. (in volts) generated in the coil is
|
(a) 10 |
(b) 5 |
(c) 2.5 |
(d) 1.25 |
If one of the two slits of Young's double-slit experiment is painted so that it transmits half the light intensity as the second slit, then:
In radioactive disintegration $\alpha$-particle, $\beta$-particle and $\gamma$-rays are emitted. Out of these which has highest ionisation power ?
→In the shown arrangement of the experiment of the meter bridge if AC corresponding to null deflection of galvanometer is x, what would be its value if the radius of the wire AB is doubled
|
(a) x |
(b) x/4 |
(c) 4x |
(d) 2x |
Energy stored in electromagnetic oscillations is in the form of
|
(a) Electrical energy |
(b) Magnetic energy |
(c) Both (a) and (b) |
(d) None of these |
The length of a solenoid is 0.4m and the number turns in it is 500. A current of 3 amp, is flowing in it. In a small coil of radius 0.01m and number of turns 10, a current of 0.4 amp. is flowing. The torque necessary to keep the axis of this coil perpendicular to the axis of solenoid will be:
The relation between geometrical length $(L_{g})$ of a magnet and its magnetic length $(L_{m})$ is :
→The work function of metal is 1 eV. Light of wavelength 3000 Å is incident on this metal surface. The velocity of emitted photo-electrons will be
|
(a) 10 m/sec |
(b) 1 |
(c) |
(d) |
When a bar magnet is broken into two pieces:
The average acceleration in one time period in a simple harmonic motion is:
→-
$\text{A}\omega^2$
-
$\frac{\text{A}\omega^2}{2}$
-
$\frac{\text{A}\omega^2}{\sqrt{2}}$
-
$\text{Zero}.$