Current Electricity Test

Result

Current Electricity Test - 125

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Weekly Quiz Competition

Question 1
4 / -1

The graph represents the current voltage behaviour of a water voltameter. Spot the correct explanation:

A
Ohm’s law is obeyed but only for potential difference larger than the back e.m.f.

B
Electrolysis do not obey Ohm’s law

C
Ohm’s law is not valid for low voltages

D
Dissociation takes place at E₁ and it obey’s Ohm’s law thereafter
Question 2
4 / -1

What carries current in an electrolyte?

A
electrons only

B
– ve ions only

C
+ ve ions only

D
both +ve and – ve ions
Question 3
4 / -1

The electrochemical equivalent of magnesium is 0.126 mg/C. A current of 10 A is passed in a suitable solution for ½ hour. The mass of magnesium deposited in gram will be

A
0.0378

B
0.227

C
0.378

D
2.27

Solution
Question 4
4 / -1

A current of 1 A is passed through a dilute sulphuric acid for sometime to liberate 1 g of oxygen. How much hydrogen is liberate during this period? [Faraday constant F = 96500 C/mol]

A
2g

B
1g

C
0.5g

D
0.125g

Solution
Question 5
4 / -1

An ammeter reads 0.90 A when connected in series with a silver voltameter that deposits 2.60 gram of silver in 40 minutes. By what percentage is the ammeter reading is correct? Atomic weight of silver = 108 and 1 F = 96500 C?

A
5 %

B
7 %

C
-5 %

D
-7 %

Solution
Question 6
4 / -1

In an electroplating experiment, m g of silver is deposited when 4 A of current flows for 2 minutes. The amount in g of silver deposited by 6 A of current for 40 seconds will be

A
4 m

B
2 m

C
m/2

D
m/4

Solution
Question 7
4 / -1

The Peltier coefficent of a thermo couple of metals A and B at junction temperature T is given by

A

B

C

D

Solution
Question 8
4 / -1

Thomson coefficient σ, temperature T (in kelvin and Seebeck coefficent S are related as

A

B

C

D

Solution
Question 9
4 / -1

A 5ºC rise in temperature is observed in a conductor by passing a current. When the current is doubled, the rise in temperature will be approximately

A
10ºC

B
12ºC

C
16ºC

D
20ºC

Solution
Question 10
4 / -1

The resistor R₁ dissipates power P when connected to a generator. If a resistor R₂is inserted in series with R₂, the power dissipated by R₁

A
increases

B
decreases

C
remains the same

D
may increase or decrease depending on the values of R₁ and R₂