Current Electricity Test

Result

Current Electricity Test - 127

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Weekly Quiz Competition

Question 1
4 / -1

Electrochemical equivalent of a metal is 3.3 × 10^-7 kg/coulombs. The mass of the metal liberated at the cathode when a 3A current is passed for 2 seconds will be

A

B

C

D

Solution
Question 2
4 / -1

The temperature of inversion of a thermocouple is 620ºC and the neutral temperature is 300ºC. What is the temperature of cold junction?

A
40ºC

B
20ºC

C
320ºC

D
– 20ºC

Solution
Question 3
4 / -1

A heater coil is cut into two equal parts and only one part is now used in the heater. The heat generated will now be

A
halved

B
one fourth

C
four times

D
doubled

Solution
Question 4
4 / -1

Two voltameters, one of copper and another of silver, are joined in parallel. When a total charge q flows through the voltameters, equal amount of metals are deposited. If the electrochemical equivalents of copper and silver are z₁ and z₂ respectively and charge which flows through the silver voltameter is

A

B

C

D

Solution
Question 5
4 / -1

A rigid container with thermally insulated walls contains a coil of resistance 100Ω, carrying current 1A. change in internal energy after 5 minute will be

A
0 kJ

B
10 kJ

C
20 kJ

D
30 kJ

Solution
Question 6
4 / -1

For ensuring dissipation of same energy in all three resistors (R₁, R₂, R₃) connected as shown in Fig., their values must be related as

A
R₁ = R₂ = R₃

B
R₂ = R₃ and R₁ = 4R₂

C
R₂ = R₃ and R₁ = R₂/4

D
R₁ = R₂ + R₃

Solution
Question 7
4 / -1

A 5.0 ampere current is set up in an external circuit by a 6.0 volt storage battery for 6.0 minutes. The chemical energy of the battery is reduced by

A

B

C

D

Solution
Question 8
4 / -1

A capacitor of capacitance 3μF is first charged by connecting across a 10 V battery, then it is allowed to get discharged through 2Ω and 4Ω resistor by closing the key K Fig. The total energy dissipated in 2Ω resistors is equal to

A
0.15 mJ

B
0.5 mJ

C
0.05 mJ

D
1.0 mJ

Solution
Question 9
4 / -1

In the circuit shown in the Fig., the 5Ω resistance develops 20.00 cal/s due to the current flowing through it. The heat developed in 2Ω resistance (in cal/s) is

A
23.8

B
14.2

C
11.9

D
7.1

Solution
Question 10
4 / -1

The resistor in which maximum heat will be produced is

A
2 Ω

B
3 Ω

C
4 Ω

D
6 Ω

Solution