1
AIEEE 2004
+4
-1
The electrochemical equivalent of a metal is $${3.35109^{ - 7}}$$ $$kg$$ per Coulomb. The mass of the metal liberated at the cathode when a $$3A$$ current is passed for $$2$$ seconds will be
A
$$6.6 \times {10^{57}}/kg$$
B
$$9.9 \times {10^{ - 7}}\,kg$$
C
$$19.8 \times {10^{ - 7}}\,kg$$
D
$$1.1 \times {10^{ - 7}}\,kg$$
2
AIEEE 2004
+4
-1
The thermo $$emf$$ of a thermocouple varies with temperature $$\theta$$ of the hot junction as $$E = a\theta + b{\theta ^2}$$ in volts where the ratio $$a/b$$ is $${700^ \circ }C.$$ If the cold junction is kept at $${0^ \circ }C,$$ then the neutral temperature is
A
$${1400^ \circ }C$$
B
$${350^ \circ }C$$
C
$${700^ \circ }C$$
D
No neutral temperature is possible for this termocouple.
3
AIEEE 2004
+4
-1
The Kirchhoff's first law $$\left( {\sum i = 0} \right)$$ and second law $$\left( {\sum iR = \sum E} \right),$$ where the symbols have their usual meanings, are respectively based on
A
conservation of charge, conservation of momentum
B
conservation of energy, conservation of charge
C
conservation of momentum, conservation of charge
D
conservation of charge, conservation of energy
4
AIEEE 2004
+4
-1
A material $$'B'$$ has twice the specific resistance of $$'A'.$$ A circular wire made of $$'B'$$ has twice the diameter of a wire made of $$'A'$$. Then for the two wires to have the same resistance, the ratio $${l \over B}/{l \over A}$$ of their respective lengths must be
A
$$1$$
B
$${l \over 2}$$
C
$${l \over 4}$$
D
$$2$$
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