In electrolysis the mass deposited on an electrode is directly proportional to
Current
Square of current
Concentration of solution
Inverse of current
If nearly 105 C liberate 1g equivalent of aluminium, then the amount of aluminium (equivalent weight 9) deposited through electrolysis in 20 min by a current of 50 A will be
0.6 g
0.09 g
5.4 g
10.8 g
Direct current is passed through a copper sulphate solution using platinum electrodes. The elements liberated at the electrodes are
Copper at anode and sulphur at cathode
Sulphur at anode and copper at cathode
Oxygen at anode and copper at cathode
Copper at anode and oxygen at cathode
A current of 3 A flows through the 2Ω resistor shown in the circuit. The power dissipated in the 5Ω resistor is
4 W
2 W
1 W
5 W
A 4µF capacitor is charged to 400 V and then its plates are joined through a resistance of 1 kΩ. The heat produced in the resistance is
0.16 J
1.28 J
0.64 J
0.32 J
Two 220 V, 100 W bulbs are connected first in series and then in parallel. Each time the combination is connected to a 220 V AC supply line. The power drawn by the combination in each case respectively will be
200 W, 150 W
50 W, 200 W
50 W, 100 W
100 W, 50 W
An electric kettle has two heating coils. When one of the coils is connected to an AC source, the water in the kettle boils in 10 min When the other coil is used the water boils in 40 min. If both the coils are connected in parallel, the time taken by the same quantity of water to boil will be.
25 min
15 min
8 min
4min.
In producing chlorine through electrolysis 100 W power at 125 V is being consumed. How much chlorine per minute is liberated ? (ECE of chlorine is 0.367 x 10-6 kg/C)
17.6 mg
21.3 mg
24.3 mg
13.6 mg
An electric kettle takes 4 A current at 220 V. How much time will it take to boil 1 kg of water from temperature 20oC ? (The temperature of boiling water is 100oC)
6.3 min
8.4 min
12.6 min
4.2 min
The total power dissipated in watts in the circuit shown here is
16
40
54
4
