Science Group
Explore subjects and practice MCQs
7
Chapters
1,610
Total MCQs
Science Group
Answer: EMF = -dPhi/dt, the negative rate of flux change.
Answer: Lenz\'s Law states induced current opposes the change.
Answer: Transformers use mutual electromagnetic induction.
Answer: Ideal transformer has 100% efficiency.
Answer: L depends on number of turns, area, and length.
Answer: Generator converts mechanical to electrical energy.
Answer: Pakistan uses 50 Hz AC supply.
Answer: Eddy currents are induced in bulk conductors.
Answer: Inductance is measured in Henry (H).
Answer: Parallel currents attract; anti-parallel currents repel.
Answer: First law: delta U = Q - W, conservation of energy.
Answer: Absolute zero is 0 K = -273.15 C.
Answer: Isothermal means constant temperature.
Answer: Carnot efficiency = 1 - T_sink/T_source.
Answer: Specific heat capacity of water is ~4200 J/kgK.
Answer: Adiabatic: no heat exchange with surroundings.
Answer: Average KE = 3/2 kT, proportional to absolute temperature.
Answer: N = N0 e^(-lambda t), an exponential decay.
Answer: Alpha particles are helium nuclei with charge +2e.
Answer: Half-life is when half the radioactive nuclei decay.