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ENERGY: Action of electricity on materials
ENERGY: Action of heat on materials
MATTER - PROPERTIES AND TRANSFORMATION: Chemical Reactions And Equations
MATTER - PROPERTIES AND TRANSFORMATION: Chemical Symbols, Formulae And Valency
MATTER - PROPERTIES AND TRANSFORMATION: Effect Of Heat On Substances
MATTER - PROPERTIES AND TRANSFORMATION: Introduction To Chemistry - Symbols
MATTER - PROPERTIES AND TRANSFORMATION: Mixtures And Pure Substances
MATTER - PROPERTIES AND TRANSFORMATION: Periodic table - Families of elements and Relative reactivity
MATTER - PROPERTIES AND TRANSFORMATION: Reaction With Oxygen of air
MATTER - PROPERTIES AND TRANSFORMATION: The Atom And Sub-Atomic Particles
5/50 MCQs for:
ENERGY: Action of electricity on materials
Fused (molten) lead(II) bromide (PbBr₂) conducts electricity because of the presence of:
Mobile ions.
Atoms.
Free electrons.
Molecules.
When an electric current is passed through molten potassium bromide (KBr), what forms at the positive electrode (anode)?
Hydrogen gas.
Bromine gas.
Oxygen gas.
Potassium metal.
Why is wood a non-conductor?
It's flammable.
It absorbs water easily.
It has a crystalline structure.
It does not have free electrons or mobile ions.
Which part of a common electrical wire is typically made of an insulator?
Neither part.
The outer coating (e.g., plastic).
Both parts equally.
The metal core (e.g., copper).
When electric current passes through a metal like copper, what carries the charge?
Atoms.
Free electrons.
Molecules.
Ions.
