Q. No.
A current of 3 A flows through the 2 Ω resistor shown in the circuit. The power dissipated in the 5 Ω resistor is :
1. 4 W
2. 2W
3. 1 W
4. 5W
1. 4 W
2. 2W
3. 1 W
4. 5W
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A potentiometer circuit is set up as shown. The potential gradient across the potentiometer wire is k volt/cm and the ammeter, present in the circuit, reads 1.0 A when the two-way key is switched off. The balance points, when the key between the terminals (i) 1 and 2 (ii) 1 and 3, is plugged in, are found to be at lengths and respectively. The magnitudes, of the resistors R and X, in ohm, are then, equal, respectively, to
1.
2.
3.
4.
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A carbon resistor of (47 ± 4.7) kΩ is to be marked with rings of different colours for its identification. The colour code sequence will be:
1. Violet - Yellow - Orange - Silver
2. Yellow - Violet - Orange - Silver
3. Yellow - Green - Violet - Gold
4. Green - Orange - Violet - Gold
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By using only two resistance coils-singly, in series, or in parallel one should be able to obtain resistances of 3, 4, 12, and 16 ohms. The separate resistances of the coil are :
(1) 3 and 4
(2) 4 and 12
(3) 12 and 16
(4) 16 and 3
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The equivalent resistance between the points P and Q in the network given here is equal to (given ) :
(1)
(2) 1 Ω
(3)
(4) 2 Ω
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In the adjoining circuit, the battery E1 has an e.m.f. of 12 volts and zero internal resistance while the battery E has an e.m.f. of 2 volts. If the galvanometer G reads zero, then the value of the resistance X in ohm is
(1) 10
(2) 100
(3) 500
(4) 200
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Five resistances are connected as shown in the figure. The effective resistance between the points A and B is :
(1)
(2)
(3) 15 Ω
(4) 6 Ω
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In the figure shown, the capacity of the condenser C is . The current in 2 Ω resistor is :
(1) 9 A
(2) 0.9 A
(3)
(4)
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Masses of three wires of copper are in the ratio of 1 : 3 : 5 and their lengths are in the ratio of 5 : 3 : 1. The ratio of their electrical resistances are :
(1) 1 : 3 : 5
(2) 5 : 3 : 1
(3) 1 : 15 : 125
(4) 125: 15: 1
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The drift velocity of the electrons in a current-carrying metallic conductor is of the order of
1.
2.
3.
4.
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