7a Electricity I

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Question 1 of 13

1. Question
1 point(s)
1.25 ×10¹⁹ electrons are added into an object. Calculate the net charge of the object in the unit of Coulomb. (Charge of 1 electron = -1.6 ×10⁻¹⁹C)
- 2C
- -2C
- 1.5C
- -1.5C
Correct

Incorrect
Question 2 of 13

2. Question
1 point(s)
The charge of an electron is -1.6×10⁻¹⁹C. How many electrons are there in -3 Coulomb of charge?
- 1.875 ×10¹⁹
- 6.025 ×10¹⁹
- 1.250 ×10¹⁹
Correct

Incorrect
Question 3 of 13

3. Question
1 point(s)
The charge of a sphere is +2C. Which of the followings is true regarding the sphere?
- There are no electrons in the sphere.
- There are 1.25 ×10¹⁹ protons more than electrons in the sphere.
- There are 1.25 ×10¹⁹ protons in the sphere.
Correct

Incorrect
Question 4 of 13

4. Question
1 point(s)
In the figure above, which picture shows the correct field pattern of the electric field around charged objects?
- Q only
- P, Q and R only
- R and S only
- Q and S only
Correct

Incorrect
Question 5 of 13

5. Question
1 point(s)
Which of the figure among P, Q, R and S shows the correct observation of a candle flame in an electric field?
- P
- Q
- R
- S
Correct

Incorrect
Question 6 of 13

6. Question
1 point(s)
The figure shows a ping pong ball coated with a layer of conductor touching a positive plate. What can be observed when the ping pong ball is released?
- The ping pong ball sticks on the positive plate.
- The ping pong ball is pushed to the negative plate and stick on the negative plate.
- The ping pong ball oscillates between the positive and the negative plate.
Correct

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Question 7 of 13

7. Question
1 point(s)
What is electric current?
- Electric current is a flow of charge particles in a conductor.
- Electric current is the motion of electrons in a conductor.
- Electric current is the rate of flow of charge.
Correct

Incorrect
Question 8 of 13

8. Question
1 point(s)
Which of the followings are the units of current?
- I. Volt
- II. Volt per second
- III. Ampere
- IV. Coulomb per second
Correct

Incorrect
Question 9 of 13

9. Question
1 point(s)
Which of the followings show the correct connection of an ammeter to measure the current passes through a resistor?
- P only
- P and Q only
- P, Q and R only
- S only
Correct

Incorrect
Question 10 of 13

10. Question
1 point(s)
Which of the following electric component can be used to control the magnitude of current in a circuit?
- Ammeter
- Voltmeter
- Ohmmeter
- Rheostat
Correct

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Question 11 of 13

11. Question
1 point(s)
A 30C of electric charge passing through a point in a conductor in 15 seconds. Calculate the electric current in the conductor.
- 1A
- 2A
- 0.5A
- 5A
Correct

Incorrect
Question 12 of 13

12. Question
1 point(s)
A current of 0.5A is flowing through a conductor. How long does it take for 20C of charge to pass through the conductor?
- 5s
- 10s
- 40s
- 50s
Correct

Incorrect
Question 13 of 13

13. Question
1 point(s)
An electric current of 50mA flows through a fan for 10 seconds. Calculate the total electric charge passes through the fan in this period.
- 0.5C
- 5C
- 50C
- 500C
Correct

Incorrect