1
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
$$R = {R_1}{R_2}/\left( {{R_1} - {R_2}} \right)$$
2
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
$$99995$$
3
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
$$400\Omega $$
4
AIEEE 2005
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
In a potentiometer experiment the balancing with a cell is at length $$240$$ $$cm.$$ On shunting the cell with a resistance of $$2\Omega ,$$ the balancing length becomes $$120$$ $$cm$$. The internal resistance of the cell is
A
$$0.5\Omega $$
B
$$1\Omega $$
C
$$2\Omega $$
D
$$4\Omega $$
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