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Test: Current & Voltage


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5 Questions MCQ Test Science & Technology for UPSC CSE | Test: Current & Voltage

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Test: Current & Voltage - Question 1

A bulb draws a current of 0.20 A for 15 minutes. What is the amount of electric charge that flows through it ?

Detailed Solution for Test: Current & Voltage - Question 1

The correct option is A.
Current (I)= 0.20 A
Time(t)= 15 min

t= 15 × 60= 900 seconds
[1 minute= 60 seconds]

We know that,
I = Q/t

0.20 = Q/900
Q= 0.20 × 900
Q= 180 C
Hence, the amount of electric charge that flows through the circuit is 180 coulombs.
 

Test: Current & Voltage - Question 2

Conventional direction of electric current is from

Detailed Solution for Test: Current & Voltage - Question 2

The current in the wire is due to the drifting of electrons inside a wire in a direction opposite to the flow of electrons. During their drifting they collide with their atoms vibrating about their mean position and lose some of kinetic energy to the vibrating atoms. 
The electrons are negatively charged particles and so, the electrons move towards the positively charged terminal from the negatively charged terminal.
Hence, the statement is true as the conventional direction of flow of current is from positive terminal to negative terminal of the cell.

Test: Current & Voltage - Question 3

The symbol used for representing Independent sources

Detailed Solution for Test: Current & Voltage - Question 3

Independent sources are represented by circle
Dependent sources are represented by Diamond.

Test: Current & Voltage - Question 4

How much work is done, when 1 coulomb of charge moves against a potential difference of 1 volt ? 

Detailed Solution for Test: Current & Voltage - Question 4

Charge moved, Q = 1 C 
Potential differnce, V = 1V 
Therefore,
Work done, W = QV 
= 1 C x 1 V
= 1 joule.

Test: Current & Voltage - Question 5

The opposing capacity of materials against the current flow is

Detailed Solution for Test: Current & Voltage - Question 5

The electrical resistance of an electrical conductor is a measure of the difficulty to pass an electric current through that conductor. 

Resistance in a conductor can be defined as the opposition offered to the flow of electrons. For a conductor of uniform cross-sectional area resistance is directly proportional to the length of the conductor and inversely proportional to the cross-sectional area of the conductor.

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