A Tesla
B Weber
C Gauss
D Henry
Explanation: Magnetic flux is measured in Weber (Wb).
A Non-uniform
B Zero
C Uniform
D Random
Explanation: Inside a long solenoid, field is uniform and axial.
A 1 Wb/m
B 1 Wb/m2
C 1 Wb m
D 1 Wb m2
Explanation: 1 Tesla = 1 Weber per square meter.
A Max force
B Zero force
C Min force
D Variable force
Explanation: F = qvB sin 0 = 0 when parallel.
A Coil moves in uniform field
B Field strength changes
C Coil at rest in uniform field
D Field and coil stationary
Explanation: Flux changes when field, area, or angle changes.
A Applied voltage
B Rate of change of flux
C Current times resistance
D Magnetic field
Explanation: EMF = -dPhi/dt, the negative rate of flux change.
A Magnitude of EMF
B Direction of induced current
C Value of flux
D Speed of induction
Explanation: Lenz\'s Law states induced current opposes the change.
A Static electricity
B Electromagnetic induction
C Ohm\'s Law
D Coulomb\'s Law
Explanation: Transformers use mutual electromagnetic induction.
A No energy loss
B 50% loss
C 100% loss
D Variable efficiency
Explanation: Ideal transformer has 100% efficiency.
A Current
B Turns and geometry
C Voltage
D Temperature only
Explanation: L depends on number of turns, area, and length.
A Electrical to mechanical
B Mechanical to electrical
C Chemical to electrical
D Heat to electrical
Explanation: Generator converts mechanical to electrical energy.
A 50 Hz
B 60 Hz
C 100 Hz
D 25 Hz
Explanation: Pakistan uses 50 Hz AC supply.
A Insulators
B Conductors
C Semiconductors
D Vacuum
Explanation: Eddy currents are induced in bulk conductors.
A Farad
B Henry
C Tesla
D Weber
Explanation: Inductance is measured in Henry (H).
A Always repel
B Attract each other
C Are zero
D Depend on temperature
Explanation: Parallel currents attract; anti-parallel currents repel.
A Conservation of mass
B Conservation of energy
C Conservation of momentum
D Conservation of charge
Explanation: First law: delta U = Q - W, conservation of energy.
A 0 C
B 0 K
C -273 C
D Both B and C
Explanation: Absolute zero is 0 K = -273.15 C.
A Increases
B Decreases
C Remains constant
D Doubles
Explanation: Isothermal means constant temperature.
A Working substance
B Source and sink temperatures
C Pressure
D Volume
Explanation: Carnot efficiency = 1 - T_sink/T_source.
A 2100 J/kgK
B 4200 J/kgK
C 900 J/kgK
D 800 J/kgK
Explanation: Specific heat capacity of water is ~4200 J/kgK.