- A115K
- B120K
- C125K
- D130K
Explanation:
Superconductors are materials that conduct electricity with no resistance. This means that, unlike the more familiar conductors such as copper or steel, a superconductor can carry a current indefinitely without losing any energy.
The upper limit temperature of a superconductor is 125K
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
If yellow light in the Young's double slit experiment is replaced by red light, the fringe width will
|
(a) Decrease |
(b) Remain unaffected |
|
(c) Increase |
(d) First increase and then decrease |
If there had been one eye of the man, then
|
(a) Image of the object would have been inverted |
(b) Visible region would have decreased |
|
(c) Image would have not been seen three dimensional |
(d) (b) and (c) both |
Energy released in the fission of a single
nucleus is 200 MeV. The fission rate of a
fuelled reactor operating at a power level of 5W is
|
(a) 1.56 |
(b) 1.56 |
(c) 1.56 |
(d) 1.56 |
A triangular loop of side l carries a current I. It is placed in a magnetic field B such that the plane of the loop is in the direction of B. The torque on the loop is
|
(a) Zero |
(b) IBl |
(c) |
(d) |
Watt-hour meter measures
|
(a) Electric energy |
(b) Current |
(c) Voltage |
(d) Power |
The magnifying power of a microscope with an objective of 5 mm focal length is 400. The length of its tube is 20 cm. Then the focal length of the eye-piece is
|
(a) 200 cm |
(b) 160 cm |
(c) 2.5 cm |
(d) 0.1 cm |
Assertion : The tangent galvanometer can be made more sensitive by increasing the number of turns of its coil.
Reason : Current through galvanometer is proportional to the number of turns of coil.
|
(a) If both assertion and reason are true and the reason is the correct explanation of the assertion. |
|
(b) If both assertion and reason are true but reason is not the correct explanation of the assertion. |
|
(c) If assertion is true but reason is false. |
|
(d) If the assertion and reason both are false. |
The laptop PC’s modern electronic watches and calculators use the following for display
|
(a) Single crystal |
(b) Poly crystal |
(c) Liquid crystal |
(d) Semiconductors |