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Physics
A. Farad
B. Henry
C. Tesla
D. Weber
Answer: Inductance is measured in Henry (H).
Physics
A. Working substance
B. Source and sink temperatures
C. Pressure
D. Volume
Answer: Carnot efficiency = 1 - T_sink/T_source.
Physics
A. Static electricity
B. Electromagnetic induction
C. Ohm\'s Law
D. Coulomb\'s Law
Answer: Transformers use mutual electromagnetic induction.
Physics
A. Increases
B. Decreases
C. Remains constant
D. Doubles
Answer: Isothermal means constant temperature.
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.
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. Electrical to mechanical
B. Mechanical to electrical
C. Chemical to electrical
D. Heat to electrical
Answer: Generator converts mechanical to electrical energy.
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. 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. Non-uniform
B. Zero
C. Uniform
D. Random
Answer: Inside a long solenoid, field is uniform and axial.
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. Insulators
B. Conductors
C. Semiconductors
D. Vacuum
Answer: Eddy currents are induced in bulk conductors.
Physics
A. No energy loss
B. 50% loss
C. 100% loss
D. Variable efficiency
Answer: Ideal transformer has 100% efficiency.
Physics
A. Tesla
B. Weber
C. Gauss
D. Henry
Answer: Magnetic flux is measured in Weber (Wb).
Physics
A. Max force
B. Zero force
C. Min force
D. Variable force
Answer: F = qvB sin 0 = 0 when parallel.
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. Current
B. Turns and geometry
C. Voltage
D. Temperature only
Answer: L depends on number of turns, area, and length.
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. 50 Hz
B. 60 Hz
C. 100 Hz
D. 25 Hz
Answer: Pakistan uses 50 Hz AC supply.