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Chapter 1 - Electric Current, Ohms Law and Kirchhoffs Laws

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Chapter 2 - Magnetic Effects of Electric Current and Measuring Instruments

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Chapter 3 - Electromagnetic Induction and AC Dynamo and Transformer

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Chapter 4 - Alternating Current AC Circuits

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Chapter 5 - Dual Nature of Wave and Particle

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Chapter 6 - Atomic Spectra and X-Rays

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Chapter 7 - Lasers and Principles

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Chapter 8 - Modern Electronics and Semiconductors

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Quiz

Lesson 1: Electric Current, Potential Difference, Resistance and Resistivity — Picture questions (exam style)

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  • Questions count: 12
  • Passing grade: 60%
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1.
Wires X and Y have length ratio 4 : 1, diameter ratio 3 : 1 and resistivity ratio 2 : 1 (see figure). They are connected in series to a supply. Which option is correct?
Wires X and Y have length ratio 4 : 1, diameter ratio 3 : 1 and resistivity ratio 2 : 1 (see figure). They are connected in series to a supply. Which option is correct?
R_X : R_Y = 64 : 81, I_X : I_Y = 1 : 1
R_X : R_Y = 9 : 8, I_X : I_Y = 1 : 2
R_X : R_Y = 8 : 81, I_X : I_Y = 1 : 1
R_X : R_Y = 8 : 9, I_X : I_Y = 1 : 1
2.
A 6 Ω wire is connected to a source of e.m.f. 12 V and internal resistance 2 Ω. The wire is drawn out to 4 times its length (constant volume) and reconnected. Which option is correct?
A 6 Ω wire is connected to a source of e.m.f. 12 V and internal resistance 2 Ω. The wire is drawn out to 4 times its length (constant volume) and reconnected. Which option is correct?
new current = 0.462 A, power in wire = 13.5 W
new current = 0.375 A, power in wire = 3.38 W
new current = 0.122 A, power in wire = 3.38 W
new current = 0.122 A, power in wire = 1.44 W
3.
A uniform 96 Ω wire is cut into 4 equal pieces; 3 are joined in parallel and the group is put in series with the rest, across an ideal 24 V supply (figure). Which option is correct?
A uniform 96 Ω wire is cut into 4 equal pieces; 3 are joined in parallel and the group is put in series with the rest, across an ideal 24 V supply (figure). Which option is correct?
equivalent resistance = 6 Ω, power in one parallel piece = 1.5 W
equivalent resistance = 6 Ω, power in one parallel piece = 24 W
equivalent resistance = 32 Ω, power in one parallel piece = 1.5 W
equivalent resistance = 32 Ω, power in one parallel piece = 13.5 W
4.
Wires X and Y have length ratio 3 : 1, diameter ratio 1 : 1 and resistivity ratio 2 : 1 (see figure). They are connected in series to a supply. Which option is correct?
Wires X and Y have length ratio 3 : 1, diameter ratio 1 : 1 and resistivity ratio 2 : 1 (see figure). They are connected in series to a supply. Which option is correct?
R_X : R_Y = 6 : 1, P_X : P_Y = 1 : 36
R_X : R_Y = 6 : 1, P_X : P_Y = 6 : 1
R_X : R_Y = 6 : 2, P_X : P_Y = 6 : 2
R_X : R_Y = 6 : 1, P_X : P_Y = 36 : 1
5.
Wires X and Y have length ratio 2 : 1, diameter ratio 2 : 1 and resistivity ratio 1 : 1 (see figure). They are connected in parallel to a supply. Which option is correct?
Wires X and Y have length ratio 2 : 1, diameter ratio 2 : 1 and resistivity ratio 1 : 1 (see figure). They are connected in parallel to a supply. Which option is correct?
R_X : R_Y = 1 : 2, P_X : P_Y = 4 : 1
R_X : R_Y = 2 : 1, P_X : P_Y = 1 : 4
R_X : R_Y = 1 : 2, P_X : P_Y = 2 : 1
R_X : R_Y = 1 : 4, P_X : P_Y = 4 : 1
6.
A uniform 72 Ω wire is cut into 6 equal pieces; 2 are joined in parallel and the group is put in series with the rest, across an ideal 6 V supply (figure). Which option is correct?
A uniform 72 Ω wire is cut into 6 equal pieces; 2 are joined in parallel and the group is put in series with the rest, across an ideal 6 V supply (figure). Which option is correct?
equivalent resistance = 2 Ω, power in one parallel piece = 0.037 W
equivalent resistance = 54 Ω, power in one parallel piece = 0.037 W
equivalent resistance = 2 Ω, power in one parallel piece = 0.148 W
equivalent resistance = 72 Ω, power in one parallel piece = 3 W
7.
Wires X and Y have length ratio 2 : 1, diameter ratio 3 : 1 and resistivity ratio 1 : 1 (see figure). They are connected in parallel to a supply. Which option is correct?
Wires X and Y have length ratio 2 : 1, diameter ratio 3 : 1 and resistivity ratio 1 : 1 (see figure). They are connected in parallel to a supply. Which option is correct?
R_X : R_Y = 9 : 2, P_X : P_Y = 4 : 81
R_X : R_Y = 81 : 4, P_X : P_Y = 9 : 2
R_X : R_Y = 2 : 9, P_X : P_Y = 9 : 2
R_X : R_Y = 4 : 81, P_X : P_Y = 2 : 9
8.
Wires X and Y have length ratio 1 : 1, diameter ratio 2 : 1 and resistivity ratio 4 : 1 (see figure). They are connected in series to a supply. Which option is correct?
Wires X and Y have length ratio 1 : 1, diameter ratio 2 : 1 and resistivity ratio 4 : 1 (see figure). They are connected in series to a supply. Which option is correct?
R_X : R_Y = 1 : 2, P_X : P_Y = 1 : 2
R_X : R_Y = 2 : 1, P_X : P_Y = 1 : 1
R_X : R_Y = 1 : 1, P_X : P_Y = 1 : 1
R_X : R_Y = 1 : 2, P_X : P_Y = 2 : 1
9.
A uniform 12 Ω wire is cut into 6 equal pieces; 4 are joined in parallel and the group is put in series with the rest, across an ideal 12 V supply (figure). Which option is correct?
A uniform 12 Ω wire is cut into 6 equal pieces; 4 are joined in parallel and the group is put in series with the rest, across an ideal 12 V supply (figure). Which option is correct?
equivalent resistance = 12 Ω, power in one parallel piece = 14.2 W
equivalent resistance = 4.5 Ω, power in one parallel piece = 72 W
equivalent resistance = 4.5 Ω, power in one parallel piece = 0.889 W
equivalent resistance = 12 Ω, power in one parallel piece = 72 W
10.
A 4 Ω wire is connected to a source of e.m.f. 12 V and internal resistance 0 Ω. The wire is drawn out to 2 times its length (constant volume) and reconnected. Which option is correct?
A 4 Ω wire is connected to a source of e.m.f. 12 V and internal resistance 0 Ω. The wire is drawn out to 2 times its length (constant volume) and reconnected. Which option is correct?
new current = 1.50 A, power in wire = 18.0 W
new current = 0.750 A, power in wire = 36.0 W
new current = 0.750 A, power in wire = 18.0 W
new current = 0.750 A, power in wire = 9.00 W
11.
A uniform 96 Ω wire is cut into 6 equal pieces; 5 are joined in parallel and the group is put in series with the rest, across an ideal 12 V supply (figure). Which option is correct?
A uniform 96 Ω wire is cut into 6 equal pieces; 5 are joined in parallel and the group is put in series with the rest, across an ideal 12 V supply (figure). Which option is correct?
equivalent resistance = 2.67 Ω, power in one parallel piece = 6.25 W
equivalent resistance = 96 Ω, power in one parallel piece = 0.25 W
equivalent resistance = 19.2 Ω, power in one parallel piece = 0.25 W
equivalent resistance = 2.67 Ω, power in one parallel piece = 9 W
12.
A uniform 96 Ω wire is cut into 4 equal pieces; 2 are joined in parallel and the group is put in series with the rest, across an ideal 24 V supply (figure). Which option is correct?
A uniform 96 Ω wire is cut into 4 equal pieces; 2 are joined in parallel and the group is put in series with the rest, across an ideal 24 V supply (figure). Which option is correct?
equivalent resistance = 48 Ω, power in one parallel piece = 0.96 W
equivalent resistance = 60 Ω, power in one parallel piece = 0.96 W
equivalent resistance = 60 Ω, power in one parallel piece = 3.84 W
equivalent resistance = 96 Ω, power in one parallel piece = 24 W
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