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