Current Electricity Test

Result

Current Electricity Test - 156

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Weekly Quiz Competition

Question 1
4 / -1

For goldplating on a copper chain, the substance required in the form of solution is

A
Copper sulphate

B
Copper chloride

C
Potassium cyanide

D
Potassium aurocyanide
Question 2
4 / -1

On passing the current in water voltameter, hydrogen

A
Is liberated at anode

B
Is liberated at cathode

C
Is not liberated

D
Remains in the solution
Question 3
4 / -1

In water voltameter, the electrolysis of ... takes place

A
H₂O

B
H₂SO₄

C
H₂O and H₂SO₄ both

D
H₂ and O₂
Question 4
4 / -1

The chemical equivalent of copper and zinc are 32 and 108 respectively. When copper and silver voltameters are connected in series and electric current is passed through for sometime, 1.6 g of copper is deposited. Then, the mass of silver deposited will be

A
3.5 g

B
2.8 g

C
5.4 g

D
None of these

Solution
Question 5
4 / -1

A battery of e.m.f. 3 volt and internal resistance 1.0 ohm is connected in series with copper voltameter. The current flowing in the circuit is 1.5 amperes. The resistance of voltameter will be

A
Zero

B
1.0 ohm

C
1.5 ohm

D
2.0 ohm

Solution
Question 6
4 / -1

According to Faraday\'s laws of electrolysis, the amount of decomposition is proportional to

A

B
Electrochemical equivalent of the substance

C

D
Question 7
4 / -1

If in a voltaic cell 5 gm of zinc is consumed, then we get how many ampere hours? (Given that E.C.E. of Zn is 3.387 × 10^–7 kg/coulomb)

A
2.05

B
8.2

C
4.1

D
5 × 3.387 × 10^–7

Solution
Question 8
4 / -1

The current flowing in a copper voltameter is 1.6 A. The number of Cu⁺⁺ ions deposited at the cathode per minute are

A
1.5 × 10²⁰

B
3 × 10²⁰

C
6 × 10²⁰

D
1 × 10¹⁹

Solution
Question 9
4 / -1

In a copper voltameter experiment, current is decreased to one-fourth of the initial value but is passed for four times the earlier duration. Amount of copper deposited will be

A
Same

B
One-fourth the previous value

C
Four time the previous value

D
1/6 th of the previous value

Solution
Question 10
4 / -1

A certain charge liberates 0.8 gm of O₂. The same charge will liberate how many gm of silver?

A
108 gm

B
10.8 gm

C
0.8 gm

D

Solution