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⁞ Physics

General Science ➤ Physics ➤ 1
Question 11
Q11.  Superconductivity means _______________ .
 

Answer :  current without facing any resistance


Superconductivity is a phenomenon of exactly zero electrical resistance and expulsion of magnetic fields occuring in certain materials when cooled below a characteristic critical temperature.

In a Superconductor, the resistance drops abruptly to Zero when the material is cooled below its critical temperature. An electric current flowing through a loop of superconducting wire can persist indefinitely with no power source.
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Question 12
Q12.  In the resistance colour code , the fourth band signifies __________ .
 

Answer :  Tolerance level


The first and second band represent the numerical value of the resistor, and the colour of the third band specify the power of ten multiplier. Reading the resistor from left to right, the fourth band represents the tolerance.


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Question 13
Q13.  In Astrophysics, what name is given to a hypothetical hole in outer space from which stars and energy emerge ?
 

Answer :  White Hole


A White Hole is a hypothetical hole in outer space from which energy, stars and other celestial matter emerge or explode. It is a theoretical celestial object into which matter is funneled from a black hole.
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Question 14
Q14.  Neutrons are slowed down in a nuclear reactor by _________ .
 

Answer :  Moderator


In thermal nuclear reactors, the coolant acts as a moderator that must slow down the nuetrons before they can be efficiently absorbed by the fuel. It allows neutrons to slow down to energies where they can easily cause a nucleus to fission.
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Question 15
Q15.  Which of the following is not matched ?
 

Answer :  Celsius - Unit of Heat


As a form of energy heat has the unit joule (J) in the International System of Units (SI).
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