1
AIEEE 2005
+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
$$400\Omega$$
2
AIEEE 2005
+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
$$4\Omega$$
3
AIEEE 2005
+4
-1
An energy source will supply a constant current into the load if its internal resistance is
A
very large as compared to the load resistance
B
equal to the resistance of the load
C
non-zero but less than the resistance of the load
D
zero
4
AIEEE 2004
+4
-1
An electric current is passed through a circuit containing two wires of the same material, connected in parallel. If the lengths and radii are in the ratio of $${4 \over 3}$$ and $${2 \over 3}$$, then the ratio of the current passing through the wires will be
A
$$8/9$$
B
$$1/3$$
C
$$3$$
D
$$2$$
EXAM MAP
Medical
NEET