Test: Current And Voltage


5 Questions MCQ Test General Science(Prelims) by IRS Divey Sethi | Test: Current And Voltage


Description
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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 ?

Solution:

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.
 

QUESTION: 2

Conventional direction of electric current is from

Solution:

The flow of electrons is termed electron current. Electrons flow from the negative terminal to the positive. Conventional current or simply current, behaves as if positive charge carriers cause current flow. Conventional current flows from the positive terminal to the negative.

QUESTION: 3

The symbol used for representing Independent sources

Solution:

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

QUESTION: 4

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

Solution:

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

QUESTION: 5

The opposing capacity of materials against the current flow is

Solution:

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.