Current Electricity Test

Result

Current Electricity Test - 158

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Question 1
4 / -1

Two electrolytic cells containing CuSO₄ do AgNO₃ respectively are connected in series and a current is passed through them until 1mg of copper is deposited in the first cell. The amount of silver deposited in the second cell during this time is approximately
[Atomic weights of copper and silver are respectively 63.57 and 107.88]

A
1.7 mg

B
3.4 mg

C
5.1 mg

D
6.8 mg

Solution
Question 2
4 / -1

A current I is passed for a time t through a number of voltameters. If m is the mass of a substance deposited on an electrode and z is its electrochemical equivalent, then

A

B

C

D

Solution
Question 3
4 / -1

For electroplating a spoon, it is placed in the vlotameter at

A
The position of anode

B
The position of cathode

C
Exactly in the middle of anode and the cathode

D
Anywhere in the electrolyte
Question 4
4 / -1

If nearly 10⁵ coulomb liberate 1 gm equivalent of aluminium, then the amount of aluminium (equivalent weight 9) deposited through electrolysis in 20 minutes by a current of 50 amp will be

A
0.6 gm

B
0.09 gm

C
5.4 gm

D
10.8 gm

Solution
Question 5
4 / -1

Electroplating does not help in

A
Fine finish to the surface

B
Shining appearance

C
Metals to become hard

D
Protecting metal against corrosion
Question 6
4 / -1

When a current is passed through water, acidified with a dilute sulphuric acid, the gases formed at the platinum electrodes are

A
1 vol. hydrogen (cathode) and 2 vol. oxygen (anode)

B
2 vol. hydrogen (cathode) and 1 vol. oxygen (anode)

C
1 vol. hydrogen (cathode) and 1 vol. oxygen (anode)

D
1 vol. oxygen (cathode) and 2 vol. hydrogen (anode)
Question 7
4 / -1

The negative Zn pole of a Daniel cell, sending a constant current through a circuit, decreases in mass by 0.13 g in 30 minutes. If the electrochemical equivalent of Zn and Cu are 32.5 and 31.5 respectively, the increase in the mass of the positive Cu pole in this time is

A
0.242 g

B
0.190 g

C
0.141 g

D
0.126 g

Solution
Question 8
4 / -1

A copper voltameter is connected in series with a heater coil of resistance 0.1 S2. A steady current flows in the circuit for twenty minutes and mass of 0.99g of copper is deposited at the cathode. If electrochemical equivalent of copper is 0.00033 gm/C, then heat generated in the coil is

A
750 J

B
650 J

C
350 J

D
250 J

Solution
Question 9
4 / -1

The value of current required to deposit 0.972 gm of chromium in 3 hours if the E.C.E. of chromium is 0.00018 gm per coulomb, is

A
1 amp

B
1.5 amp

C
0.5 amp

D
2 amp

Solution
Question 10
4 / -1

The current inside a copper voltameter

A
Is half the outside value

B
Is the same as the outside value

C
Is twice the outside value

D
Depends on the concentration of CuSO₄