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1.
The main supply voltage to a room is 120 V. The resistance of the lead wires is 6
. A 60 W bulb is already giving light. What is the decrease in voltage across the bulb when a 240 W heater is switched on?
. A 60 W bulb is already giving light. What is the decrease in voltage across the bulb when a 240 W heater is switched on?
2.
Two bulbs 40 W and 60 W and rated voltage 240 V are connected in series across a potential difference of 420 V. Which bulb will work at above its rated voltages?
3.
A current of 1.5 A flows through a copper voltmeter. The thickness of copper deposited on the electrode surface of area 50 
in 20 min is (density of Cu=9000 
in 20 min is (density of Cu=9000
4.
If in the circuit shown below, the internal resistance of the battery is 
and 
and
are the potentials at 
and 
respectively, what is the potential difference between the points and
and and are the potentials at and respectively, what is the potential difference between the points and
5.
A certain charge liberates 
of 
The same charge will liberate how many 
of silver
of The same charge will liberate how many of silver
6.
-
meter measures
- meter measures
7.
A potentiometer having the potential gradient of 
is used to measure the difference of potential across a resistance of 
If a length of 
of the potentiometer wire is required to get the null point, the current passing through the 
resistor is (in 
)
is used to measure the difference of potential across a resistance of If a length of of the potentiometer wire is required to get the null point, the current passing through the resistor is (in )
8.
Two electric lamps of 40 watt each are connected in parallel. The power consumed by the combination will be
9.
Which arrangement of four identical resistance should be used to draw maximum energy from a cell of voltage 
10.
Equivalent resistance between 
and 
will be
and will be