1
AIEEE 2004
+4
-1
In a meter bridge experiment null point is obtained at $$20$$ $$cm$$, from one end of the wire when resistance $$X$$ is balanced against another resistance $$Y.$$ If $$X < Y$$, then where will be the new position of the null point from the same end, if one decides to balance a resistance of $$4$$ $$X$$ against $$Y$$
A
$$40$$ $$cm$$
B
$$80$$ $$cm$$
C
$$50$$ $$cm$$
D
$$70$$ $$cm$$
2
AIEEE 2004
+4
-1
A
metal oxides with high temperature coefficient of resistivity
B
metals with high temperature coefficient of resistivity
C
metals with low temperature coefficient of resistivity
D
semiconducting materials having low temperature
3
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
$$1.1 \times {10^{ - 7}}\,kg$$
4
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.
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