Electricity Test

Result

Electricity Test - 5

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Weekly Quiz Competition

Question 1
1 / -0

Through a metallic conductor, electric current is considered to be due to movement of

A
ions

B
amperes

C
electrons

D
protons

Solution

Through a metallic conductor, electric current is considered to be due to movement of electrons.
Question 2
1 / -0

The work done in moving a unit positive charge across two points in an electric circuit is a measure of

A
current

B
potential difference

C
resistance

D
power

Solution

Electrostatic potential difference between two points is the amount of work done per unit positive charge, by an external agent, in moving it (without acceleration) from one point to another against the electrostatic field along any path.
Question 3
1 / -0

N identical cells are connected to form a battery. When the terminals of the battery are joined directly, current I flows in the circuit. Under what condition can we obtain the maximum value of I?

A
When all the cells should be joined in series.

B
When all the cells should be joined in parallel.

C
When two rows of each of N/2 cells should be joined in parallel.

D
When the current drawn is same for all possible combinations.

Solution

The more cells we connect in series, the higher the circuit resistance will be. Hence, the current will be less.
And, the more cells we connect in parallel, the lower the circuit resistance will be. So, the current will be more.
Question 4
1 / -0

In a series combination of electrical appliances, total electric power

A
increases

B
decreases

C
may increase or decrease according to the situation

D
no definite observation

Solution

P = V²/R where R = Resistance
Now, in series circuit, as the number of appliances increases, the resistance increases and hence, the total power decreases.