Current Electricity Mega test 2
19 Quiz points Reward on 85% to 100% score
Make sure you go through and revise the second lesson of Current Electricity, so that you do better in this test. As this test can be taken only once, and your score will be saved.
Make sure you have a scientific calculator with you before you start, for calculations.
This test will show, how well you are prepared for the exam. So don’t forget to revise before you start.
This mega test includes 30 Current electricity Questions.
Total time for this mega test is 30minutes.
You have 1 minute for each question.
Good Luck!
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- Review
- Answered
- Incorrect
- Question 1 of 30
1. Question
- There is a current in a metal wire.
Which particles in the wire move to cause this current?
CorrectIncorrectHint
Current is produced from the flow of electrons.
- Question 2 of 30
2. Question
CorrectIncorrectHint
I (in A) = Q (in C) / t (in s) , And Electrons move from negative terminal to the positive terminal.
- Question 3 of 30
3. Question
You need to use a calculator in this question.
In an electric circuit, 40C of electric charge pass a point in 5.0 s.
What is the current in the circuit?
CorrectIncorrectHint
I (in A) = Q (in C) / t (in s)
- Question 4 of 30
4. Question
The diagram shows a circuit.
The reading on the ammeter is 12A.
How much charge passes through the ammeter in 2.0 minutes?
CorrectIncorrectHint
Don’t forget to convert the time in minutes to seconds.
1 minute = 60 seconds. - Question 5 of 30
5. Question
In the circuit shown, the voltmeter reads 2.0 V . A charge of 5.0 C passes through the resistor in a certain time.
How much energy is supplied to the resistor in this time?
CorrectIncorrectHint
Re-arrange the equation, V = E / Q.
- Question 6 of 30
6. Question
Which circuit shows a voltmeter measuring the p.d. across a resistor?
CorrectIncorrectHint
Make sure to select the option that measures potential difference (p.d) across the resistor as told in question (not across lamp).
- Question 7 of 30
7. Question
CorrectIncorrectHint
Potential difference is also referred to as voltage.
- Question 8 of 30
8. Question
Which symbols are used for the units of current and of resistance?
CorrectIncorrectHint
The unit of Resistance is ohms and of current is amperes.
- Question 9 of 30
9. Question
A pupil measures the potential difference across a device and the current in it.
Which calculation gives the resistance of the device?
CorrectIncorrect - Question 10 of 30
10. Question
The circuit shows a 24 V battery connected to two resistors in series.
The reading on the ammeter is 2.0 A and the reading on the voltmeter is 8.0 V.
What is the resistance of resistor R?
CorrectIncorrectHint
R = V / I
- Question 11 of 30
11. Question
A small potential difference V is applied across a filament lamp. The current I in the lamp is measured . V is increased in stages and I is measured at each stage.
CorrectIncorrectHint
Filament lamp is a non-ohmic conductor, means it does not obey Ohm’s law. So current and voltage will not be directly proportional.
- Question 12 of 30
12. Question
The diagram shows a battery connected to two resistors.
Four students separately measure the electromotive force (e.m.f.) of the battery, the current in the resistors, and the potential difference (p.d.) across resistor R.
Their results are shown in the table below.
Which row shows values with their correct units?
CorrectIncorrectHint
Just Look at the units of each quantity carefully.
- Question 13 of 30
13. Question
Which diagram shows the current-voltage (I-V) characteristic for a filament lamp?
CorrectIncorrectHint
Filament lamp is a non-ohmic conductor, As it’s temperature does not remains constant, for the Ohm’s law to obey.
- Question 14 of 30
14. Question
The graph shows the relationship between the current in a circuit component and the potential difference (p.d.) across it.
The graph has a straight section and a curved section.
What happens to the resistance of the component in these two sections as the current increases?
CorrectIncorrect - Question 15 of 30
15. Question
A wire has a certain electrical resistance.
The diameter and length of the wire may be changed.
Which pair of changes must cause the resistance of the wire to increase?
CorrectIncorrectHint
R = pl / A
Resistance R is directly proportional to the length, and inversely proportional to the cross-sectional area (thickness) or diameter.
- Question 16 of 30
16. Question
Which two changes to a metal wire both increases resistance?
CorrectIncorrectHint
R = pl / A
Resistance R is directly proportional to the length, and inversely proportional to the cross-sectional area (thickness) or diameter.
And temperature is directly related to resistance.
- Question 17 of 30
17. Question
The diagrams represent four copper wires.
Which wire has the greatest resistance?
CorrectIncorrectHint
R = pl / A
Resistance R is directly proportional to the length, and inversely proportional to the cross-sectional area (thickness) or diameter.
- Question 18 of 30
18. Question
The diagram shows a piece of metal resistance wire.
Which wire, made of the same metal, has a smaller resistance?
CorrectIncorrectHint
R = pl / A
Resistance R is directly proportional to the length, and inversely proportional to the cross-sectional area (thickness) or diameter.
- Question 19 of 30
19. Question
A student has wires of different lengths and different diameters. The wires are all made of the same metal.
The student measures the resistance of one wire.
Which wire has a greater resistance than the wire he has measured?
CorrectIncorrectHint
R = pl / A, resistivity p is same, for same materials.
Resistance R is directly proportional to the length, and inversely proportional to the cross-sectional area (thickness) or diameter.
- Question 20 of 30
20. Question
Four wires are made from the same material.
Which wire has the least resistance?
CorrectIncorrectHint
R = pl / A, resistivity p is same, for same materials.
Resistance R is directly proportional to the length, and inversely proportional to the cross-sectional area (thickness) or diameter.
No need of calculation, just see the values and apply how they are proportional.
- Question 21 of 30
21. Question
Which sample of copper wire has the greatest electrical resistance?
CorrectIncorrectHint
R = pl / A, resistivity p is same, for same materials.
Resistance R is directly proportional to the length, and inversely proportional to the cross-sectional area (thickness) or diameter.
No need of calculation, just see the values and apply how they are proportional.
- Question 22 of 30
22. Question
Which copper wire would have the smallest resistance?
CorrectIncorrectHint
R = pl / A, resistivity p is same, for same materials.
Resistance R is directly proportional to the length, and inversely proportional to the cross-sectional area (thickness) or diameter.
- Question 23 of 30
23. Question
A student uses a length of wire as a resistor. He discovers that the resistance of the wire is too small.
To be certain of making a resistor of higher value, he should use a piece of wire that is
CorrectIncorrectHint
R = pl / A, resistivity p is same, for same materials.
Resistance R is directly proportional to the length, and inversely proportional to the cross-sectional area (thickness) or diameter.
- Question 24 of 30
24. Question
The diagram shows an incomplete circuit.
Four wires of different length and thickness are connected in turn between point X and Y.
All four wires are made of the same metal.
Which wire will cause the greatest reading on the ammeter?
CorrectIncorrectHint
R = V / I, shows that Resistance R is inversely proportional to the Current I.
So higher current reading means lower resistance.
Then, R = pl / A
- Question 25 of 30
25. Question
A metal wire of length 100 cm and cross-sectional area 0.20 mm² has a resistance of 8.0?.
What is the resistance of a wire of the same metal of length 50 cm and cross-sectional area of 0.40 mm² ?
CorrectIncorrectHint
Compare the two wires using the equation, R = pl / A.
If not getting how to do it go back and watch the videos again.
- Question 26 of 30
26. Question
CorrectIncorrect - Question 27 of 30
27. Question
CorrectIncorrect - Question 28 of 30
28. Question
CorrectIncorrect - Question 29 of 30
29. Question
CorrectIncorrect - Question 30 of 30
30. Question
CorrectIncorrect