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Physics

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 Quiz: Faradays Law of Induction, Lenzs Law and EMF in a Moving Wire

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1.
STEM Physics Problem 11: A copper wire of resistance 8.0 Ω is drawn out uniformly so that its length increases to three times its original value. Assuming constant mass and density, what is the new resistance of the wire?
72.0 Ω
16.0 Ω
2.67 Ω
24.0 Ω
2.
STEM AC Transformer Problem 40: An ideal step-down transformer connected to a 220 V mains supply delivers power to a 12 V, 24 W lamp. What is the current flowing in the primary coil?
1.5 A
2.0 A
0.109 A
0.545 A
3.
STEM Alternating Current Dynamo Problem 21: An AC generator coil of 100 turns and area 0.05 m2 rotates at 3,000 rpm in a uniform magnetic field of 0.14 T. What is the maximum electromotive force (EMF_max) generated? (Use π = 22/7)
110 V
440 V
220 V
311 V
4.
STEM Alternating Current Dynamo Problem 36: An AC generator coil of 100 turns and area 0.05 m2 rotates at 3,000 rpm in a uniform magnetic field of 0.14 T. What is the maximum electromotive force (EMF_max) generated? (Use π = 22/7)
311 V
440 V
220 V
110 V
5.
STEM Alternating Current Dynamo Problem 43: An AC generator coil of 100 turns and area 0.05 m2 rotates at 3,000 rpm in a uniform magnetic field of 0.14 T. What is the maximum electromotive force (EMF_max) generated? (Use π = 22/7)
440 V
220 V
110 V
311 V
6.
STEM Alternating Current Dynamo Problem 20: An AC generator coil of 100 turns and area 0.05 m2 rotates at 3,000 rpm in a uniform magnetic field of 0.14 T. What is the maximum electromotive force (EMF_max) generated? (Use π = 22/7)
110 V
220 V
440 V
311 V
7.
STEM Kirchhoff's Laws Problem 22: In a closed circuit junction, currents I1 = 2 A and I2 = 3 A flow toward junction A, while I3 = 1 A flows away. According to Kirchhoff's First Law (KCL), what is the magnitude and direction of the remaining current I
4 A flowing toward junction A
2 A flowing toward junction A
6 A flowing away from junction A
4 A flowing away from junction A
8.
STEM Magnetic Force Problem 38: A straight conductor of length 0.50 m carries a current of 4.0 A in a uniform magnetic field of flux density 0.20 T. What is the magnetic force acting on the wire when it is inclined at 30° to the field lines?
0.40 N
0.346 N
0.10 N
0.20 N
9.
STEM Physics Problem 19: A copper wire of resistance 8.0 Ω is drawn out uniformly so that its length increases to three times its original value. Assuming constant mass and density, what is the new resistance of the wire?
16.0 Ω
2.67 Ω
24.0 Ω
72.0 Ω
10.
A mercury manometer connected to a gas tank shows the mercury level in the free arm is 4 cm higher than the gas arm (Pa = 76 cm Hg). The gas pressure is:
80 cm Hg
4 cm Hg
76 cm Hg
72 cm Hg
11.
STEM Kirchhoff's Laws Problem 35: In a closed circuit junction, currents I1 = 2 A and I2 = 3 A flow toward junction A, while I3 = 1 A flows away. According to Kirchhoff's First Law (KCL), what is the magnitude and direction of the remaining current I
4 A flowing toward junction A
2 A flowing toward junction A
4 A flowing away from junction A
6 A flowing away from junction A
12.
STEM AC Transformer Problem 33: An ideal step-down transformer connected to a 220 V mains supply delivers power to a 12 V, 24 W lamp. What is the current flowing in the primary coil?
0.109 A
1.5 A
0.545 A
2.0 A
13.
STEM Semiconductor Electronics Problem 24: How is a p-type semiconductor crystal produced from pure intrinsic silicon?
By doping the silicon crystal with trivalent impurity atoms (such as Boron or Aluminum), creating positive holes as majority carriers
By heating pure silicon above 1,000°C without impurities
By cooling silicon to absolute zero Kelvin
By doping with pentavalent Phosphorus atoms
14.
STEM Magnetic Force Problem 43: A straight conductor of length 0.50 m carries a current of 4.0 A in a uniform magnetic field of flux density 0.20 T. What is the magnetic force acting on the wire when it is inclined at 30° to the field lines?
0.40 N
0.10 N
0.346 N
0.20 N
15.
STEM Kirchhoff's Laws Problem 30: In a closed circuit junction, currents I1 = 2 A and I2 = 3 A flow toward junction A, while I3 = 1 A flows away. According to Kirchhoff's First Law (KCL), what is the magnitude and direction of the remaining current I
4 A flowing away from junction A
6 A flowing away from junction A
2 A flowing toward junction A
4 A flowing toward junction A
16.
The hydrostatic pressure exerted by a static homogeneous liquid of density rho at depth h beneath its free surface is expressed by:
P = 1/2 rho * g * h2
P = rho * g / h
P = rho * h / g
P = rho * g * h
17.
Boyle's Law states that for a fixed mass of an ideal gas kept at constant temperature, the volume V is:
Inversely proportional to its absolute pressure P (P1 * V1 = P2 * V2)
Directly proportional to absolute temperature
Directly proportional to pressure
Independent of pressure changes
18.
STEM Magnetic Force Problem 10: A straight conductor of length 0.50 m carries a current of 4.0 A in a uniform magnetic field of flux density 0.20 T. What is the magnetic force acting on the wire when it is inclined at 30° to the field lines?
0.20 N
0.346 N
0.10 N
0.40 N
19.
STEM Semiconductor Electronics Problem 15: How is a p-type semiconductor crystal produced from pure intrinsic silicon?
By doping with pentavalent Phosphorus atoms
By cooling silicon to absolute zero Kelvin
By doping the silicon crystal with trivalent impurity atoms (such as Boron or Aluminum), creating positive holes as majority carriers
By heating pure silicon above 1,000°C without impurities
20.
Why is the scale of a Hot-Wire Ammeter non-uniformly divided with increasing intervals between marks?
B) Because thermal energy generated is proportional to the square of current (\(Q propto I^2\))
D) Due to friction on the rotating pulley axis
C) Because the expansion coefficient of Platinum-Iridium is nonlinear
A) Due to ambient room temperature fluctuations
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