Practice MCQs For For Static Electricity, Current Electricity, D.C. Circuits and Practical Electric Circuitry

This quiz contains practice questions for GCE ‘O’ level topics: Static Electricity, Current Electricity, D.C. Circuits and Practical Electric Circuitry. There are explanations for some of the questions after you submit the quiz. If you could not figure out why a particular option is the answer, feel free to drop a comment below or ask a question in ‘O’ & ‘A’ Level Discussion section of the forum. If you wish to contribute questions to this quiz, please contact us.

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1. Which graph shows how the current changes when the voltage across a fixed resistance is varied?

D

C

A

B

2. Which of the following is a correct unit of current?

QV

VR

CV

$\frac{C}{s}$

3. Three resistors have the same resistance, R, where R is positive and of some finite value. These three resistors are connected in a circuit. Which of the following combinations of their voltages is NOT possible?

0 V, 2 V, 5 V

3 V, 2 V, 5 V

2 V, 2 V, 2 V

0 V, 0 V, 0 V

4. Diagram 1 shows a resistor with resistance R connected to a battery, an ammeter and a voltmeter.

The ammeter reading is $A_{1}$ and the voltmeter reading is $V_{1}$.

A 3 identical resistors are now connected with the first resistor, as shown in diagram 2.

What are the ammeter (A) and voltmeter (V) readings in the circuit shown in diagram 2?

 

(Hint: Current only flows when there is a potential difference.)

$A = A_{1}$ ; $V = \frac{1}{2} V_{1}$

$A = \frac{1}{2} A_{1}$ ; $V = V_{1}$

$A = \frac{1}{4} A_{1}$ ; $V = \frac{1}{2} V_{1}$

A = 0 ; $V = \frac{1}{2} V_{1}$

5. Which diagram correctly shows the electric field lines between two point charges?

B

A

D

C

6. The terminals of a battery are joined by a length of resistance wire. Which change, on its own, will increase the current through the battery?

covering the wire with plastic insulation

using a shorter wire of the same material and the same thickness

using a thinner wire of the same material and the same length

connecting an identical wire in series with the first one

7. A combined bathroom unit of a heater and a lamp is controlled by one switch. The unit contains a 2 kW heater and a 100 W lamp. In one week, the lamp uses 1 kWh of electrical energy.

How much electrical energy is used by the heater alone?

20 kWh

4 kWh

10 kWh

2 kWh

8. A resistor has 3 A current flowing through it. How much charge has flown through the resistor in 4 seconds?

12 C

18 C

3 C

6 C

9. When an electricity bill is paid, we pay for

the quantity of charges consumed.

the power used.

the voltage installed across the supply.

the energy used.

10. A $1.0 \, \Omega$ resistor and a $2.0 \, \Omega$ resistor are connected in series across a 12 V D.C. supply.

What is the current in the circuit?

0.25 A

12 A

6.0 A

4.0 A

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