In the circuit shown in fig , the current drawn from the battery is 4 A. If 10 resistor is replaced by 20 resistor, the current drawn from the circuit will be
(1) 1 A
(2) 2 A
(3) 4 A
(4) 8 A
Each resistance in the network is R. The equivalent resistance between points P and Q is
(1) R
(2) 5 R
(3) 3 R
(4) 6 R
The potential difference between A and B in the circuit shown is
(1) 10 V
(2) 5 V
(3) 15 V
(4) zero
As the switch S is closed in the circuit shown in fig., current that will pass through it is
(1) 4.5 A
(2) 6.0 A
(3) 3.0 A
(4) zero
Find the current through 2 resistor.
(1) 0
(2) 1 amp
(3) 2 amp
(4) 4 amp
In the circuit shown in fig, the equivalent resistance between A and B is
(1) 8
(2) 12
(3) 24
(4) 32
Seven resistorsm each of 1 , are connected as shown in fig. The effective resistance between A and B is
(1)
(2)
(3) 7
(4)
The equivalent resistance between the points A and B is (resistance of each side of smaller square is R)
(1) R
(2) 3 R/2
(3) 2 R
(4) R/2
A cell develops the same power across two resistances separately. The internal resistance of the cell is
(1)
(2)
(3)
(4)
Two conductors have the same resistance at but their temperature coefficients of resistance are . The respective temperature coefficients of their series and parallel combinations are nearly
(1)
(2)
(3)
(4)
To Verify Ohm's law, a student is provided with a test resistor , a high resistance , a small resistance , two identical galvanometers and , and a variable voltage source V. The correct circuit to carry out the experiment is
(1)
(2)
(3)
(4)
If a wire is stretched to make it 0.1 % longer, its resistance will
(1) increase by 0.2 %
(2) decrease by 0.2 %
(3) decrease by 0.05 %
(4) increase by 0.05 %
A meter bridge is set-up as shown. To determine an unknown resistance 'X' using a standard 10 ohm resistor, the galvanometer shows null point when tapping key is at 52 cm mark. The end-corrections are 1 cm and 2 cm respectively for the ends A and B. The determined value of 'X' is
(1) 10.2 ohm
(2) 10.6 ohm
(3) 10.8 ohm
(4) 11.1 ohm
Resistance of a given wire is obtained by measuring the current flowing in it and the voltage difference applied across it. If the percentage errors in the measurement of the current and the voltage difference are 3% each, then error in the value of resistance of the wire is
(1) zero
(2) 1 %
(3) 3 %
(4) 6 %
Two electric bulbs marked 25 W - 220 V and 100 W - 220 V are connected in series to a 440 V supply. Which of the bulbs will fuse?
(1) 100 W
(2) 25 W
(3) neither
(4) both