1
AIEEE 2005
MCQ (Single Correct Answer)
+4
-1
Two voltmeters, one of copper and another of silver, are joined in parallel. When a total charge $$q$$ flows through the voltmeters, equal amount of metals are deposited. If the electrochemical equivalents of copper and silver are $${Z_1}$$ and $${Z_2}$$ respectively the charge which flows through the silver voltmeter is
A
$${q \over {1 + {{{Z_2}} \over {{Z_1}}}}}$$
B
$${q \over {1 + {{{Z_1}} \over {{Z_2}}}}}$$
C
$$q{{{Z_2}} \over {{Z_1}}}$$
D
$$q{{{Z_1}} \over {{Z_2}}}$$
2
AIEEE 2005
MCQ (Single Correct Answer)
+4
-1
Two sources of equal $$emf$$ are connected to an external resistance $$R.$$ The internal resistance of the two sources are $${R_1}$$ and $${R_2}\left( {{R_1} > {R_1}} \right).$$ If the potential difference across the source having internal resistance $${R_2}$$ is zero, then
A
$$R = {R_2} - {R_1}$$
B
$$R = {R_2} \times \left( {{R_1} + {R_2}} \right)/\left( {{R_2} - {R_1}} \right)$$
C
$$R = {R_1}{R_2}/\left( {{R_2} - {R_1}} \right)$$
D
$$R = {R_1}{R_2}/\left( {{R_1} - {R_2}} \right)$$
3
AIEEE 2005
MCQ (Single Correct Answer)
+4
-1
A moving coil galvanometer has $$150$$ equal divisions. Its current sensitivity is $$10$$- divisions per milliampere and voltage sensitivity is $$2$$ divisions per millivolt. In order that each division reads $$1$$ volt, the resistance in $$ohms$$ needed to be connected in series with the coil will be -
A
$${10^5}$$
B
$${10^3}$$
C
$$9995$$
D
$$99995$$
4
AIEEE 2005
MCQ (Single Correct Answer)
+4
-1
The resistance of hot tungsten filament is about $$10$$ times the cold resistance. What will be resistance of $$100$$ $$W$$ and $$200$$ $$V$$ lamp when not in use ?
A
$$20\Omega$$
B
$$40\Omega$$
C
$$200\Omega$$
D
$$400\Omega$$
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