AIEEE 2003 | Current Electricity Question 372 | Physics

The thermo $$e.m.f.$$ of a thermo -couple is $$25$$ $$\mu V/{}^ \circ C$$ at room temperature. A galvanometer of $$40$$ $$ohm$$ resistance, capable of detecting current as low as $${10^{ - 5}}\,A,$$ is connected with the thermo couple. The smallest temperature difference that can be detected by this system is

$${16^0}C$$

$${12^0}C$$

$${8^0}C$$

$${20^0}C$$

AIEEE 2003

MCQ (Single Correct Answer)

-1

An ammeter reads upto $$1$$ ampere. Its internal resistance is $$0.81$$ $$ohm$$. To increase the range to $$10$$ $$A$$ the value of the required shunt is

$$0.03\,\Omega $$

$$0.3\,\Omega $$

$$0.9\,\Omega $$

$$0.09\,\Omega $$

AIEEE 2003

MCQ (Single Correct Answer)

-1

The length of a given cylindrical wire is increased by $$100\% $$. Due to the consequent decrease in diameter the change in the resistance of the wire will be

$$200\% $$

$$100\% $$

$$50\% $$

$$300\% $$

AIEEE 2002

MCQ (Single Correct Answer)

-1

If $${\theta _1},$$ is the inversion temperature, $${\theta _n}$$ is the neutral temperature, $${\theta _c}$$ is the temperature of the cold junction, then

$${\theta _i} + {\theta _c} = {\theta _n}$$

$${\theta _i} - {\theta _c} = 2{\theta _n}$$

$${{{\theta _i} + {\theta _C}} \over 2} = {\theta _n}$$

$${\theta _c} - {\theta _i} = 2{\theta _n}$$

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