The relative permeability (
of a ferromagnetic substance varies with temperature (T) according to the curve

|
(a) A |
(b) B |
(c) C |
(d) D |
The relative permeability (
of a ferromagnetic substance varies with temperature (T) according to the curve

|
(a) A |
(b) B |
(c) C |
(d) D |
(c) C
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The half-life of a radioactive substance is 40 years. How long will it take to reduce to one fourth of its original amount and what is the value of decay constant
| (a) 40 year, 0.9173/year | (b) 90 year, 9.017/year |
| (c) 80 year, 0.0173 year | (d) None of these |

In a transistor in CE configuration, the ratio of power gain to voltage gain is
|
(a) a |
(b) b / a |
(c) ba |
(d) b |
In nuclear fission, the fission reactions proceeds with a projectile. Which of the following suits the best
|
(a) Slow proton |
(b) Fast neutron |
(c) Slow neutron |
(d) None of these |
An archaeologist analyses the wood in a prehistoric structure and finds that
(Half life = 5700 years) to
is only one- fourth of that found in the cells buried plants. The age of the wood is about
|
(a) 5700 years |
(b) 2850 years |
(c) 11,400 years |
(d) 22,800 years |