DP IB Physics: SL

Topic Questions

IBPhysics: SLDPTopic Questions5. Electricity & Magnetism5.2 Heating Effect of Electric Currents

Syllabus Edition

First teaching 2014

Last exams 2024

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5.2 Heating Effect of Electric Currents

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1
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Select the row which correctly identifies the three circuit symbols shown below. 

5-2-q1-sl-easy-mcq-phy-

  I. II. III.
A. heating element potentiometer variable resistor
B. heating element fuse thermistor
C. resistor ammeter variable resistor
D. voltmeter fuse thermistor

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2
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Identify two features of the circuit shown.

5-2-q2-sl-easy-mcq-phy-

A. a bulb is in series with a fixed resistor current can be measured through the cell
B. a bulb is protected by a fuse current can be measured through the bulb
C. a bulb is protected by a fuse voltage can be measured across the cell
D. a capacitor is in series with a fuse voltage can be measured across the bulb

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3
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Electrons moving through a metal wire transfer some of their electric potential energy to the positive ions of the metal. Which two changes are caused by this energy transfer?

  Kinetic energy of the lattice Resistance of the metal wire
A. decreases decreases
B. decreases increases
C. increases decreases
D. increases increases

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4
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Two identical 10 Ω resistors are connected first in series, and then in parallel, as shown.


5-2-q4-sl-easy-mcq-phy

Determine the correct combined resistance of each arrangement.

  Series Parallel
A. 5 Ω 20 Ω
B. 10 Ω 20 Ω
C. 20 Ω 10 Ω
D. 20 Ω 5 Ω

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5
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Select the graph which best describes the I-V characteristic of an ohmic resistor.

  • 5-2-q5-opt-a-sl-easy-mcq-phy

  • 5-2-q5-opt-b-sl-easy-mcq-phy

  • 5-2-q5-opt-c-sl-easy-mcq-phy

  • 5-2-q5-opt-d-sl-easy-mcq-phy

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6
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A wire with resistivity ρ, length L and cross-sectional area A has resistance R.

5-2-q6-1-sl-easy-mcq-phy

Which of the wire, made from the same material, will also have resistance R?

5-2-q6-2-sl-easy-mcq-phy

  • I only

  • I and II

  • II and III

  • III only

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7
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Which of the following statements are benefits of using parallel circuits when connecting components in homes and vehicles?

  1. A single power source supplies all lights and appliances with the same potential difference 
  2. The current is the same in all branches so only one type of fuse is needed
  3. If one bulb breaks, the appliances in other branches continue to work

  • I and II

  • I and III

  • II and III

  • I, II and III

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8
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A student is provided with three identical cells, each having a potential difference of V.

For the two arrangements shown, what is the total potential difference across the array?

5-2-q8-sl-easy-mcq-phy

  Series Parallel

A.

 V 3 V
B. 1 third V 3 V
C. 3 V 1 third V
D. 3 V V

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9
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A particular quantity X is an important factor when calculating for electrical circuits. X can be found using several different equations, as shown.

X space equals space W over t

 		 X space equals space I V X space equals space I squared R X space equals space V squared over R

Which option identifies X?

  • Current, I

  • Power, P

  • Resistance, R

  • Resistivity, ρ

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10
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Potential divider circuits are used to control outputs that are often changed, such as volume and brightness. For the potential divider circuit shown, identify the output voltage, Vout in terms of the input voltage, Vin.

5-2-q10-sl-easy-mcq-phy

  • V subscript o u t end subscript space equals space 1 fourth V subscript i n end subscript

  • V subscript o u t end subscript space equals space 1 third V subscript i n end subscript

  • V subscript o u t end subscript space equals space V subscript i n end subscript

  • V subscript o u t end subscript space equals space 3 over 4 V subscript i n end subscript

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1
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What is the current reading on the ideal ammeter shown?

5-2-sl-mcq-hard-q1-phy

  • 1.0 A

  • 2.0 A

  • 3.3 A

  • 6.6 A

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2
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What is the current reading on the ideal ammeter shown?

5-2-sl-mcq-hard-q2-phy

  • 0 A

  • 0.12 mA

  • 12 A

  • 26.7 A

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3
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A student is investigating the properties of cells made using lemons. They find that their lemon cell has an emf of 1.0 V and internal resistance 5000 Ω. The student wonders what the least number of lemons they would need to light a bulb with a rating of 5.0 W and 8.0 V.

What is the best estimate of the least number of lemons?

  • 9

  • 3000

  • 15 000

  • 30 000

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4
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The diagram shows a cubical wire framework made from rigid, uniform copper wire. The wires all have the same length.

Points A and H are connected to the terminals of a 6.0 V power supply. Side AB has a resistance of 2.0 Ω.

5-2-sl-mcq-hard-q4-question-phy

Which line correctly identifies the total resistance of the network, the potential at F and the current in BC?

  total resistance / Ω current in side BC / A potential at F / V
A. 1 third 3.6 6.0
B. 5 over 3 0.6 2.4
C. 1 third 1.2 3.6
D. 5 over 3 0.6 6.0

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5
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The circuit shown includes three identical cylindrical resistors, with dimensions such that the cross-sectional area is 5 mm2, the length is 20 cm and the resistance is R Ω.

When the switch is closed, the total resistance of the circuit is 5 kΩ.

5-2-sl-mcq-hard-q5-phy

What is the resistivity of the material that the resistors are made from?

  • 0.08 Ω m

  • 0.25 Ω m

  • 8.0 Ω m

  • 25 Ω m

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6
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The readings on both ammeters are zero. What are the values of X and Y?

5-2-sl-mcq-hard-q6-phy

  X / Ω Y / Ω
A. 2 12
B. 2 6
C. 4 12
D. 4 6

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7
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A strain gauge is a device which measure force. An applied tension on a thin wire of known resistance changes the length and cross-sectional area so that the value of the resistance is changed in a predictable way (assuming that volume remains constant).

When the length of the wire is increased by 5 % what will be the effect on the resistance?

  • − 5 %

  • + 5 %

  • − 10 %

  • + 10 %

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8
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Two rods have the same length, and the same resistance. One rod is made from copper and the other from aluminium.

Copper is three times as dense as aluminium but has half the value of resistivity.

A student wants to know the ratio of:

fraction numerator m a s s space a l u m i n i u m space r o d over denominator m a s s space c o p p e r space r o d end fraction

Which option is the correct answer?

  • 6

  • 3 over 2

  • 2 over 3

  • 1 over 6

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9
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The identical resistors marked (i), (ii), (iii) and (iv) are connected as shown. The battery which has negligible internal resistance supplies a total power of 20 W. 

5-2-sl-mcq-hard-q9-phy

What is the power dissipated in resistor (iv)?

  • 2.0 W

  • 3.0 W

  • 4.0 W

  • 6.0 W

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10
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A circuit contains five identical resistors and four identical voltmeters. The reading on voltmeter V1 is 8.0 V and the reading on voltmeter V2 is 1.0 V. What are the readings on V3 and V4?q11_heating-effect-of-electric-currents_ib-sl-physics-mcq

 

reading on voltmeter V3 / V

reading on voltmeter V4 / V

A.

1.5

1.0

B.

3.0

2.0

C.

4.5

3.0

D.

6.0

4.0

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1
Sme Calculator1 mark

A circuit contains five identical resistors and four identical voltmeters. The reading on voltmeter V1 is 8.0 V and the reading on voltmeter V2 is 1.0 V. What are the readings on V3 and V4?q11_heating-effect-of-electric-currents_ib-sl-physics-mcq

 

reading on voltmeter V3 / V

reading on voltmeter V4 / V

A.

1.5

1.0

B.

3.0

2.0

C.

4.5

3.0

D.

6.0

4.0

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2
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A power cable X has resistance R and carries current I. A second cable Y has resistance 2R and carries current 1 half.

What is the ratio fraction numerator p o w e r blank d i s s i p a t e d blank i n blank bold italic Y over denominator p o w e r blank d i s s i p a t e d blank i n blank bold italic X end fraction?

  • 1 fourth

  • 1 half

  • 2

  • 4

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3
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Two resistors are connected to a cell.

 

q14_heating-effect-of-electric-currents_ib-sl-physics-mcq

 

Assuming both resistors are made from wires of the same length, which graph shows how the potential V varies along the line XY?

ma14_heating-effect-of-electric-currents_ib-sl-physics-mcq

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4
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Kirchhoff’s laws are applied to the circuit shown.

 q15_heating-effect-of-electric-currents_ib-sl-physics-mcq

What is the equation for the dotted loop?

  • 0 = 2I3 – 3I2

  • 0 = 2I2 – 3I3

  • 6 = 3I2 + 2I3 + 2I1 

  • 6 = 3I2 + 2I3 

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5
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In the circuit shown, the fixed resistor has a value of 3 Ω and the variable resistor varies between 0 Ω and 12 Ω.

q16_heating-effect-of-electric-currents_ib-sl-physics-mcq

The power supply has an emf of 15 V and negligible internal resistance.

What is the range of potential differences V which can be measured across the 3 Ω resistor?

  • 3 V

  • 6 V

  • 9 V

  • 12 V

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6
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Four resistors are connected to a battery of e.m.f. 6 V as shown.

 

q17_heating-effect-of-electric-currents_ib-sl-physics-mcq

 

If the battery has negligible internal resistance, what is the current in the battery?

  • 2 A

  • 3 A

  • 4 A

  • 5 A

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7
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Which of the following cannot be the units for resistivity?

  • V m A–1

  • J m s–1 A–1

  • J m s–1 A–2

  • Ω m

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8
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Three resistors are connected to a cell of e.m.f. 10 V and negligible internal resistance as shown.

q19_heating-effect-of-electric-currents_ib-sl-physics-mcq

What is the power dissipated in one of the 2 Ω resistors and in the whole circuit?

 

power dissipated in the 2 Ω resistor / W

power dissipated in the whole circuit / W

A

1

18

B

1

20

C

2

18

D

2

20

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9
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Three identical lamps, W, X and Y are connected to a cell of negligible internal resistance as shown.

 

q20_heating-effect-of-electric-currents_ib-sl-physics-mcq

When the switch is closed, each lamp is lit. Which of the following correctly describes the brightness of lamps W, X and Y when the switch is opened?

 

lamp W

lamp X

lamp Y

A

increases

increases

decreases

B

decreases

off

decreases

C

decreases

off

increases

D

increases

decreases

decreases

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10
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A science student who lives in the UK, where the mains voltage is 240 V, buys a light bulb marked 60 W which she uses in her bedroom. The student takes the lightbulb with her on a trip to Canada where the mains voltage is 100 V and also uses it there.

Which line correctly identifies the approximate power dissipated in the bulb in the UK and Canada?

  UK / W Canada / W
A. 30 10
B. 60 30
C. 60 10
D. 120 60

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